ovn-nb(5) Open vSwitch Manual ovn-nb(5) NAME ovn-nb - OVN_Northbound database schema This database is the interface between OVN and the cloud management system (CMS), such as OpenStack, running above it. The CMS produces al‐ most all of the contents of the database. The ovn-northd program moni‐ tors the database contents, transforms it, and stores it into the OVN_Southbound database. We generally speak of ``the’’ CMS, but one can imagine scenarios in which multiple CMSes manage different parts of an OVN deployment. External IDs Each of the tables in this database contains a special column, named external_ids. This column has the same form and purpose each place it appears. external_ids: map of string-string pairs Key-value pairs for use by the CMS. The CMS might use certain pairs, for example, to identify entities in its own configuration that correspond to those in this data‐ base. TABLE SUMMARY The following list summarizes the purpose of each of the tables in the OVN_Northbound database. Each table is described in more detail on a later page. Table Purpose NB_Global Northbound configuration Copp Control plane protection Logical_Switch L2 logical switch Logical_Switch_Port L2 logical switch port Forwarding_Group forwarding group Address_Set Address Sets Port_Group Port Groups Load_Balancer load balancer Load_Balancer_Group load balancer group Load_Balancer_Health_Check load balancer ACL Access Control List (ACL) rule Logical_Router L3 logical router QoS QoS rule Mirror Mirror Entry Meter Meter entry Meter_Band Band for meter entries Logical_Router_Port L3 logical router port Logical_Router_Static_Route Logical router static routes Logical_Router_Policy Logical router policies NAT NAT rules DHCP_Options DHCP options Connection OVSDB client connections. DNS Native DNS resolution SSL SSL configuration. Gateway_Chassis Gateway_Chassis configuration. HA_Chassis_Group HA_Chassis_Group configuration. HA_Chassis HA_Chassis configuration. BFD BFD configuration. Static_MAC_Binding Static_MAC_Binding configuration. Chassis_Template_Var Chassis_Template_Var configuration. NB_Global TABLE Northbound configuration for an OVN system. This table must have ex‐ actly one row. Summary: Identity: name string Status: nb_cfg integer nb_cfg_timestamp integer sb_cfg integer sb_cfg_timestamp integer hv_cfg integer hv_cfg_timestamp integer Common Columns: external_ids map of string-string pairs Common options: options map of string-string pairs Options for configuring OVS BFD: options : bfd-min-rx optional string options : bfd-decay-min-rx optional string options : bfd-min-tx optional string options : bfd-mult optional string options : ignore_chassis_features optional string options : mac_prefix optional string options : mac_binding_removal_limit optional string, containing an integer, in range 0 to 4,294,967,295 options : fdb_removal_limit optional string, containing an integer, in range 0 to 4,294,967,295 options : controller_event optional string, either true or false options : northd_probe_interval optional string options : ic_probe_interval optional string options : nbctl_probe_interval optional string options : northd_trim_timeout optional string options : use_logical_dp_groups optional string options : use_parallel_build optional string options : ignore_lsp_down optional string options : use_ct_inv_match optional string options : default_acl_drop optional string options : debug_drop_domain_id optional string options : debug_drop_collector_set optional string options : use_common_zone optional string, either true or false options : northd-backoff-interval-ms optional string Options for configuring interconnection route advertisement: options : ic-route-adv optional string options : ic-route-learn optional string options : ic-route-adv-default optional string options : ic-route-learn-default optional string options : ic-route-blacklist optional string Connection Options: connections set of Connections ssl optional SSL Security Configurations: ipsec boolean Read-only Options: options : max_tunid optional string Details: Identity: name: string The name of the OVN cluster, which uniquely identifies the OVN cluster throughout all OVN clusters supposed to interconnect with each other. Status: These columns allow a client to track the overall configuration state of the system. nb_cfg: integer Sequence number for client to increment. When a client modifies any part of the northbound database configuration and wishes to wait for ovn-northd and possibly all of the hypervisors to fin‐ ish applying the changes, it may increment this sequence number. nb_cfg_timestamp: integer The timestamp, in milliseconds since the epoch, when ovn-northd sees the latest nb_cfg and starts processing. To print the timestamp as a human-readable date: date -d "@$(ovn-nbctl get NB_Global . nb_cfg_timestamp | sed ’s/...$//’)" sb_cfg: integer Sequence number that ovn-northd sets to the value of nb_cfg af‐ ter it finishes applying the corresponding configuration changes to the OVN_Southbound database. sb_cfg_timestamp: integer The timestamp, in milliseconds since the epoch, when ovn-northd finishes applying the corresponding configuration changes to the OVN_Southbound database successfully. hv_cfg: integer Sequence number that ovn-northd sets to the smallest sequence number of all the chassis in the system, as reported in the Chassis_Private table in the southbound database. Thus, hv_cfg equals nb_cfg if all chassis are caught up with the northbound configuration (which may never happen, if any chassis is down). This value can regress, if a chassis was removed from the system and rejoins before catching up. If there are no chassis, then ovn-northd copies nb_cfg to hv_cfg. Thus, in this case, the (nonexistent) hypervisors are always considered to be caught up. This means that hypervisors can be "caught up" even in cases where sb_cfg would show that the southbound database is not. To detect when both the hypervi‐ sors and the southbound database are caught up, a client should take the smaller of sb_cfg and hv_cfg. hv_cfg_timestamp: integer The largest timestamp, in milliseconds since the epoch, of the smallest sequence number of all the chassis in the system, as reported in the Chassis_Private table in the southbound data‐ base. In other words, this timestamp reflects the time when the slowest chassis catches up with the northbound configuration, which is useful for end-to-end control plane latency measure‐ ment. Common Columns: external_ids: map of string-string pairs See External IDs at the beginning of this document. Common options: options: map of string-string pairs This column provides general key/value settings. The supported options are described individually below. Options for configuring OVS BFD: These options apply when ovn-controller configures OVS BFD on tunnels interfaces. Please note these parameters refer to legacy OVS BFD imple‐ mentation and not to OVN BFD one. options : bfd-min-rx: optional string BFD option min-rx value to use when configuring BFD on tunnel interfaces. options : bfd-decay-min-rx: optional string BFD option decay-min-rx value to use when configuring BFD on tunnel interfaces. options : bfd-min-tx: optional string BFD option min-tx value to use when configuring BFD on tunnel interfaces. options : bfd-mult: optional string BFD option mult value to use when configuring BFD on tunnel in‐ terfaces. options : ignore_chassis_features: optional string When set to false, the ovn-northd will evaluate the features supported by each chassis and will only activate features that are universally supported by all chassis. This approach is cru‐ cial for maintaining backward compatibility during an upgrade when the ovn-northd is updated prior to the ovn-controller. How‐ ever, if any chassis is poorly managed and the upgrade is unsuc‐ cessful, it will restrict ovn-northd from activating the new features. Alternatively, setting this option to true instructs ovn-northd to bypass the support status of features on each chassis and to directly implement the latest features. This approach safeguards the operation of ovn-northd from being adversely affected by a mismatched configuration of a chassis. The default setting for this option is false. options : mac_prefix: optional string Configure a given OUI to be used as prefix when L2 address is dynamically assigned, e.g. 00:11:22 options : mac_binding_removal_limit: optional string, containing an in‐ teger, in range 0 to 4,294,967,295 MAC binding aging bulk removal limit. This limits how many rows can expire in a single transaction. Default value is 0 which is unlimited. When we hit the limit next batch removal is delayed by 5 s. options : fdb_removal_limit: optional string, containing an integer, in range 0 to 4,294,967,295 FDB aging bulk removal limit. This limits how many rows can ex‐ pire in a single transaction. Default value is 0 which is unlim‐ ited. When we hit the limit next batch removal is delayed by 5 s. options : controller_event: optional string, either true or false Value set by the CMS to enable/disable ovn-controller event re‐ porting. Traffic into OVS can raise a ’controller’ event that results in a Controller_Event being written to the Con‐ troller_Event table in SBDB. When the CMS has seen the event and taken appropriate action, it can remove the corresponding row in Controller_Event table. The intention is for a CMS to see the events and take some sort of action. Please see the Con‐ troller_Event table in SBDB. It is possible to associate a meter to each controller event type in order to not overload the pinc‐ trl thread under heavy load. Each event type relies on a meter with a defined name: • empty_lb_backends: event-elb options : northd_probe_interval: optional string The inactivity probe interval of the connection to the OVN Northbound and Southbound databases from ovn-northd, in mil‐ liseconds. If the value is zero, it disables the connection keepalive feature. If the value is nonzero, then it will be forced to a value of at least 1000 ms. options : ic_probe_interval: optional string The inactivity probe interval of the connection to the OVN Northbound and Southbound databases from ovn-ic, in millisec‐ onds. If the value is zero, it disables the connection keepalive feature. If the value is nonzero, then it will be forced to a value of at least 1000 ms. options : nbctl_probe_interval: optional string The inactivity probe interval of the connection to the OVN Northbound database from ovn-nbctl utility, in milliseconds. If the value is zero, it disables the connection keepalive feature. If the value is nonzero, then it will be forced to a value of at least 1000 ms. If the value is less than zero, then the default inactivity probe interval for ovn-nbctl would be left intact (120000 ms). options : northd_trim_timeout: optional string When used, this configuration value specifies the time, in mil‐ liseconds, since the last ovn-northd active operation after which memory trimming is performed. By default this is set to 30000 (30 seconds). options : use_logical_dp_groups: optional string Note: This option is deprecated, the only behavior is to always combine logical flows by datapath groups. Changing the value or removing this option all toghether will have no effect. ovn-northd combines logical flows that differs only by logical datapath into a single logical flow with logical datapath group attached. options : use_parallel_build: optional string If set to true, ovn-northd will attempt to compute logical flows in parallel. Parallel computation is enabled only if the system has 4 or more cores/threads available to be used by ovn-northd. The default value is false. options : ignore_lsp_down: optional string If set to false, ARP/ND reply flows for logical switch ports will be installed only if the port is up, i.e. claimed by a Chassis. If set to true, these flows are installed regardless of the status of the port, which can result in a situation that ARP request to an IP is resolved even before the relevant VM/con‐ tainer is running. For environments where this is not an issue, setting it to true can reduce the load and latency of the con‐ trol plane. The default value is true. options : use_ct_inv_match: optional string If set to false, ovn-northd will not use the ct.inv field in any of the logical flow matches. The default value is true. If the NIC supports offloading OVS datapath flows but doesn’t support offloading ct_state inv flag, then the datapath flows matching on this flag (either +inv or -inv) will not be offloaded. CMS should consider setting use_ct_inv_match to false in such cases. This results in a side effect of the invalid packets getting de‐ livered to the destination VIF, which otherwise would have been dropped by OVN. options : default_acl_drop: optional string If set to true., ovn-northd will generate a logical flow to drop all traffic in the ACL stages. By default this option is set to false. options : debug_drop_domain_id: optional string If set to a 8-bit number and if debug_drop_collector_set is also configured, ovn-northd will add a sample action to every logical flow that contains a ’drop’ action. The 8 most significant bits of the observation_domain_id field will be those specified in the debug_drop_domain_id. The 24 least significant bits of the observation_domain_id field will be the datapath’s key. The observation_point_id will be set to the first 32 bits of the logical flow’s UUID. options : debug_drop_collector_set: optional string If set to a 32-bit number ovn-northd will add a sample action to every logical flow that contains a ’drop’ action. The sample ac‐ tion will have the specified collector_set_id. The value must match that of the local OVS configuration as described in ovs-actions(7). options : use_common_zone: optional string, either true or false Default value is false. If set to true the SNAT and DNAT happens in common zone, instead of happening in separate zones, depend‐ ing on the configuration. However, this option breaks traffic when there is configuration of DGP + LB + SNAT on this LR. The value true should be used only in case of HWOL compatibility with GDP. options : northd-backoff-interval-ms: optional string Maximum interval that the northd incremental engine is delayed by in milliseconds. Setting the value to nonzero delays the next northd engine run by the previous run time, capped by the speci‐ fied value. If the value is zero the engine won’t be delayed at all. The recommended period is smaller than 500 ms, beyond that the latency of SB changes would be very noticeable. Options for configuring interconnection route advertisement: These options control how routes are advertised between OVN deployments for interconnection. If enabled, ovn-ic from different OVN deployments exchanges routes between each other through the global OVN_IC_South‐ bound database. Only routers with ports connected to interconnection transit switches participate in route advertisement. For each of these routers, there are two types of routes to be advertised: Firstly, the static routes configured in the router are advertised. Secondly, the networks configured in the logical router ports that are not on the transit switches are advertised. These are considered as di‐ rectly connected subnets on the router. Link local prefixes (IPv4 169.254.0.0/16 and IPv6 FE80::/10) are never advertised. The learned routes are added to the static_routes column of the Logi‐ cal_Router table, with external_ids:ic-learned-route set to the uuid of the row in Route table of the OVN_IC_Southbound database. options : ic-route-adv: optional string A boolean value that enables route advertisement to the global OVN_IC_Southbound database. Default is false. options : ic-route-learn: optional string A boolean value that enables route learning from the global OVN_IC_Southbound database. Default is false. options : ic-route-adv-default: optional string A boolean value that enables advertising default route to the global OVN_IC_Southbound database. Default is false. This option takes effect only when option ic-route-adv is true. options : ic-route-learn-default: optional string A boolean value that enables learning default route from the global OVN_IC_Southbound database. Default is false. This option takes effect only when option ic-route-learn is true. options : ic-route-blacklist: optional string A string value contains a list of CIDRs delimited by ",". A route will not be advertised or learned if the route’s prefix belongs to any of the CIDRs listed. Connection Options: connections: set of Connections Database clients to which the Open vSwitch database server should connect or on which it should listen, along with options for how these connections should be configured. See the Connec‐ tion table for more information. ssl: optional SSL Global SSL configuration. Security Configurations: ipsec: boolean Tunnel encryption configuration. If this column is set to be true, all OVN tunnels will be encrypted with IPsec. Read-only Options: options : max_tunid: optional string The maximum supported tunnel ID. Depends on types of encapsula‐ tion enabled in the cluster. Copp TABLE This table is used to define control plane protection policies, i.e., associate entries from table Meter to control protocol names. Summary: name string (must be unique within table) meters : arp optional string meters : arp-resolve optional string meters : dhcpv4-opts optional string meters : dhcpv6-opts optional string meters : dns optional string meters : event-elb optional string meters : icmp4-error optional string meters : icmp6-error optional string meters : igmp optional string meters : nd-na optional string meters : nd-ns optional string meters : nd-ns-resolve optional string meters : nd-ra-opts optional string meters : tcp-reset optional string meters : bfd optional string meters : reject optional string meters : svc-monitor optional string external_ids map of string-string pairs Details: name: string (must be unique within table) CoPP name. meters : arp: optional string Rate limiting meter for ARP packets (request/reply) used for learning neighbors. meters : arp-resolve: optional string Rate limiting meter for packets that require resolving the next- hop (through ARP). meters : dhcpv4-opts: optional string Rate limiting meter for packets that require adding DHCPv4 op‐ tions. meters : dhcpv6-opts: optional string Rate limiting meter for packets that require adding DHCPv6 op‐ tions. meters : dns: optional string Rate limiting meter for DNS query packets that need to be replied to. meters : event-elb: optional string Rate limiting meter for empty load balancer events. meters : icmp4-error: optional string Rate limiting meter for packets that require replying with an ICMP error. meters : icmp6-error: optional string Rate limiting meter for packets that require replying with an ICMPv6 error. meters : igmp: optional string Rate limiting meter for IGMP packets. meters : nd-na: optional string Rate limiting meter for ND neighbor advertisement packets used for learning neighbors. meters : nd-ns: optional string Rate limiting meter for ND neighbor solicitation packets used for learning neighbors. meters : nd-ns-resolve: optional string Rate limiting meter for packets that require resolving the next- hop (through ND). meters : nd-ra-opts: optional string Rate limiting meter for packets that require adding ND router advertisement options. meters : tcp-reset: optional string Rate limiting meter for packets that require replying with TCP RST packet. meters : bfd: optional string Rate limiting meter for BFD packets. meters : reject: optional string Rate limiting meter for packets that trigger a reject action meters : svc-monitor: optional string Rate limiting meter for packets that are arriving to service monitor MAC address. external_ids: map of string-string pairs See External IDs at the beginning of this document. Logical_Switch TABLE Each row represents one L2 logical switch. There are two kinds of logical switches, that is, ones that fully vir‐ tualize the network (overlay logical switches) and ones that provide simple connectivity to physical networks (bridged logical switches). They work in the same way when providing connectivity between logical ports on same chassis, but differently when connecting remote logical ports. Overlay logical switches connect remote logical ports by tun‐ nels, while bridged logical switches provide connectivity to remote ports by bridging the packets to directly connected physical L2 seg‐ ments with the help of localnet ports. Each bridged logical switch has one or more localnet ports, which have only one special address un‐ known. Summary: ports set of Logical_Switch_Ports load_balancer set of weak reference to Load_Balancers load_balancer_group set of Load_Balancer_Groups acls set of ACLs qos_rules set of QoSes dns_records set of weak reference to DNSes forwarding_groups set of Forwarding_Groups Naming: name string external_ids : neutron:network_name optional string IP Address Assignment: other_config : subnet optional string other_config : exclude_ips optional string other_config : ipv6_prefix optional string other_config : mac_only optional string, either true or false other_config : fdb_age_threshold optional string, containing an integer, in range 0 to 4,294,967,295 IP Multicast Snooping Options: other_config : mcast_snoop optional string, either true or false other_config : mcast_querier optional string, either true or false other_config : mcast_flood_unregistered optional string, either true or false other_config : mcast_table_size optional string, containing an integer, in range 1 to 32,766 other_config : mcast_idle_timeout optional string, containing an integer, in range 15 to 3,600 other_config : mcast_query_interval optional string, containing an integer, in range 1 to 3,600 other_config : mcast_query_max_response optional string, containing an integer, in range 1 to 10 other_config : mcast_eth_src optional string other_config : mcast_ip4_src optional string other_config : mcast_ip6_src optional string Interconnection: other_config : interconn-ts optional string Tunnel Key: other_config : requested-tnl-key optional string, containing an integer, in range 1 to 16,777,215 copp optional weak reference to Copp Other options: other_config : vlan-passthru optional string, either true or false other_config : broadcast-arps-to-all-routers optional string, either true or false Common Columns: external_ids map of string-string pairs Details: ports: set of Logical_Switch_Ports The logical ports connected to the logical switch. It is an error for multiple logical switches to include the same logical port. load_balancer: set of weak reference to Load_Balancers Set of load balancers associated to this logical switch. load_balancer_group: set of Load_Balancer_Groups Set of load balancers groups associated to this logical switch. acls: set of ACLs Access control rules that apply to packets within the logical switch. qos_rules: set of QoSes QoS marking and metering rules that apply to packets within the logical switch. dns_records: set of weak reference to DNSes This column defines the DNS records to be used for resolving in‐ ternal DNS queries within the logical switch by the native DNS resolver. Please see the DNS table. forwarding_groups: set of Forwarding_Groups Groups a set of logical port endpoints for traffic going out of the logical switch. Naming: These columns provide names for the logical switch. From OVN’s perspec‐ tive, these names have no special meaning or purpose other than to pro‐ vide convenience for human interaction with the database. There is no requirement for the name to be unique. (For a unique identifier for a logical switch, use its row UUID.) (Originally, name was intended to serve the purpose of a human-friendly name, but the Neutron integration used it to uniquely identify its own switch object, in the format neutron-uuid. Later on, Neutron started propagating the friendly name of a switch as external_ids:neutron:net‐ work_name. Perhaps this can be cleaned up someday.) name: string A name for the logical switch. external_ids : neutron:network_name: optional string Another name for the logical switch. IP Address Assignment: These options control automatic IP address management (IPAM) for ports attached to the logical switch. To enable IPAM for IPv4, set other_con‐ fig:subnet and optionally other_config:exclude_ips. To enable IPAM for IPv6, set other_config:ipv6_prefix. IPv4 and IPv6 may be enabled to‐ gether or separately. To request dynamic address assignment for a particular port, use the dynamic keyword in the addresses column of the port’s Logi‐ cal_Switch_Port row. This requests both an IPv4 and an IPv6 address, if IPAM for IPv4 and IPv6 are both enabled. other_config : subnet: optional string Set this to an IPv4 subnet, e.g. 192.168.0.0/24, to enable ovn-northd to automatically assign IP addresses within that sub‐ net. other_config : exclude_ips: optional string To exclude some addresses from automatic IP address management, set this to a list of the IPv4 addresses or ..-delimited ranges to exclude. The addresses or ranges should be a subset of those in other_config:subnet. Whether listed or not, ovn-northd will never allocate the first or last address in a subnet, such as 192.168.0.0 or 192.168.0.255 in 192.168.0.0/24. Examples: • 192.168.0.2 192.168.0.10 • 192.168.0.4 192.168.0.30..192.168.0.60 192.168.0.110..192.168.0.120 • 192.168.0.110..192.168.0.120 192.168.0.25..192.168.0.30 192.168.0.144 other_config : ipv6_prefix: optional string Set this to an IPv6 prefix to enable ovn-northd to automatically assign IPv6 addresses using this prefix. The assigned IPv6 ad‐ dress will be generated using the IPv6 prefix and the MAC ad‐ dress (converted to an IEEE EUI64 identifier) of the port. The IPv6 prefix defined here should be a valid IPv6 address ending with ::. Examples: • aef0:: • bef0:1234:a890:5678:: • 8230:5678:: other_config : mac_only: optional string, either true or false Value used to request to assign L2 address only if neither sub‐ net nor ipv6_prefix are specified other_config : fdb_age_threshold: optional string, containing an inte‐ ger, in range 0 to 4,294,967,295 FDB aging threshold value in seconds. FDB exceeding this timeout will be automatically removed. The value defaults to 0, which means disabled. IP Multicast Snooping Options: These options control IP Multicast Snooping configuration of the logi‐ cal switch. To enable IP Multicast Snooping set other_con‐ fig:mcast_snoop to true. To enable IP Multicast Querier set other_con‐ fig:mcast_querier to true. If IP Multicast Querier is enabled other_config:mcast_eth_src and other_config:mcast_ip4_src must be set. other_config : mcast_snoop: optional string, either true or false Enables/disables IP Multicast Snooping on the logical switch. Default: false. other_config : mcast_querier: optional string, either true or false Enables/disables IP Multicast Querier on the logical switch. Only applicable if other_config:mcast_snoop is enabled. Default: true. other_config : mcast_flood_unregistered: optional string, either true or false Determines whether unregistered multicast traffic should be flooded or not. Only applicable if other_config:mcast_snoop is enabled. Default: false. other_config : mcast_table_size: optional string, containing an inte‐ ger, in range 1 to 32,766 Number of multicast groups to be stored. Default: 2048. other_config : mcast_idle_timeout: optional string, containing an inte‐ ger, in range 15 to 3,600 Configures the IP Multicast Snooping group idle timeout (in sec‐ onds). Default: 300 seconds. other_config : mcast_query_interval: optional string, containing an in‐ teger, in range 1 to 3,600 Configures the IP Multicast Querier interval between queries (in seconds). Default: other_config:mcast_idle_timeout / 2. other_config : mcast_query_max_response: optional string, containing an integer, in range 1 to 10 Configures the value of the "max-response" field in the multi‐ cast queries originated by the logical switch. Default: 1 sec‐ ond. other_config : mcast_eth_src: optional string Configures the source Ethernet address for queries originated by the logical switch. other_config : mcast_ip4_src: optional string Configures the source IPv4 address for queries originated by the logical switch. other_config : mcast_ip6_src: optional string Configures the source IPv6 address for queries originated by the logical switch. Interconnection: other_config : interconn-ts: optional string The name of corresponding transit switch in OVN_IC_Northbound database. This kind of logical switch is created and controlled by ovn-ic. Tunnel Key: other_config : requested-tnl-key: optional string, containing an inte‐ ger, in range 1 to 16,777,215 Configures the datapath tunnel key for the logical switch. Usu‐ ally this is not needed because ovn-northd will assign an unique key for each datapath by itself. However, if it is configured, ovn-northd honors the configured value. The typical use case is for interconnection: the tunnel keys for transit switches need to be unique globally, so they are maintained in the global OVN_IC_Southbound database, and ovn-ic simply syncs the value from OVN_IC_Southbound through this config. copp: optional weak reference to Copp The control plane protection policy from table Copp used for me‐ tering packets sent to ovn-controller from ports of this logical switch. Other options: other_config : vlan-passthru: optional string, either true or false Determines whether VLAN tagged incoming traffic should be al‐ lowed. Note that this may have security implications when en‐ abled for a logical switch with a tag=0 localnet port. If not properly isolated from other localnet ports, fabric traffic that belongs to other tagged networks may be passed through such a port. other_config : broadcast-arps-to-all-routers: optional string, either true or false Determines whether arp requests and ipv6 neighbor solicitations should be sent to all routers and other switchports (default) or if it should only be sent to switchports where the ip/mac ad‐ dress is unknown. Setting this to false can significantly reduce the load if the logical switch can receive arp requests for ips it does not know about. However setting this to false also means that garps are no longer forwarded to all routers and therefor the mac bindings of the routers are no longer updated. Common Columns: external_ids: map of string-string pairs See External IDs at the beginning of this document. Logical_Switch_Port TABLE A port within an L2 logical switch. Summary: Core Features: name string (must be unique within table) type string Options: options map of string-string pairs Options for router ports: options : router-port optional string options : nat-addresses optional string options : exclude-lb-vips-from-garp optional string options : arp_proxy optional string options : enable_router_port_acl optional string, either true or false Options for localnet ports: options : network_name optional string options : ethtype optional string options : localnet_learn_fdb optional string, either true or false Options for l2gateway ports: options : network_name optional string options : l2gateway-chassis optional string Options for vtep ports: options : vtep-physical-switch optional string options : vtep-logical-switch optional string VMI (or VIF) Options: options : requested-chassis optional string options : activation-strategy optional string options : iface-id-ver optional string options : qos_min_rate optional string options : qos_max_rate optional string options : qos_burst optional string options : hostname optional string options : pkt_clone_type optional string, must be mc_unknown VIF Plugging Options: options : vif-plug-type optional string options : vif-plug-mtu-request optional string Virtual port Options: options : virtual-ip optional string options : virtual-parents optional string IP Multicast Snooping Options: options : mcast_flood optional string, either true or false options : mcast_flood_reports optional string, either true or false Containers: parent_name optional string tag_request optional integer, in range 0 to 4,095 tag optional integer, in range 1 to 4,095 Port State: up optional boolean enabled optional boolean Addressing: addresses set of strings dynamic_addresses optional string port_security set of strings DHCP: dhcpv4_options optional weak reference to DHCP_Options dhcpv6_options optional weak reference to DHCP_Options mirror_rules set of weak reference to Mirrors ha_chassis_group optional HA_Chassis_Group Naming: external_ids : neutron:port_name optional string Tunnel Key: options : requested-tnl-key optional string, containing an integer, in range 1 to 32,767 Common Columns: external_ids map of string-string pairs Details: Core Features: name: string (must be unique within table) The logical port name. For entities (VMs or containers) that are spawned in the hyper‐ visor, the name used here must match those used in the exter‐ nal_ids:iface-id in the Open_vSwitch database’s Interface table, because hypervisors use external_ids:iface-id as a lookup key to identify the network interface of that entity. For containers that share a VIF within a VM, the name can be any unique identifier. See Containers, below, for more information. A logical switch port may not have the same name as a logical router port, but the database schema cannot enforce this. type: string Specify a type for this logical port. Logical ports can be used to model other types of connectivity into an OVN logical switch. The following types are defined: (empty string) A VM (or VIF) interface. router A connection to a logical router. The value of op‐ tions:router-port specifies the name of the Logi‐ cal_Router_Port to which this logical switch port is con‐ nected. localnet A connection to a locally accessible network from ovn-controller instances that have a corresponding bridge mapping. A logical switch can have multiple localnet ports attached. This type is used to model direct connec‐ tivity to existing networks. In this case, each chassis should have a mapping for one of the physical networks only. Note: nothing said above implies that a chassis cannot be plugged to multiple physical networks as long as they belong to different switches. localport A connection to a local VIF. Traffic that arrives on a localport is never forwarded over a tunnel to another chassis. These ports are present on every chassis and have the same address in all of them. This is used to model connectivity to local services that run on every hypervisor. l2gateway A connection to a physical network. vtep A port to a logical switch on a VTEP gateway. external Represents a logical port which is external and not hav‐ ing an OVS port in the integration bridge. OVN will never receive any traffic from this port or send any traffic to this port. OVN can support native services like DHCPv4/DHCPv6/DNS for this port. If ha_chassis_group is defined, ovn-controller running in the master chassis of the HA chassis group will bind this port to provide these native services. It is expected that this port belong to a bridged logical switch (with a localnet port). It is recommended to use the same HA chassis group for all the external ports of a logical switch. Otherwise, the physical switch might see MAC flap issue when differ‐ ent chassis provide the native services. For example when supporting native DHCPv4 service, DHCPv4 server mac (con‐ figured in options:server_mac column in table DHCP_Op‐ tions) originating from different ports can cause MAC flap issue. The MAC of the logical router IP(s) can also flap if the same HA chassis group is not set for all the external ports of a logical switch. Below are some of the use cases where external ports can be used. • VMs connected to SR-IOV nics - Traffic from these VMs by passes the kernel stack and local ovn-con‐ troller do not bind these ports and cannot serve the native services. • When CMS supports provisioning baremetal servers. virtual Represents a logical port which does not have an OVS port in the integration bridge and has a virtual ip configured in the options:virtual-ip column. This virtual ip can move around between the logical ports configured in the options:virtual-parents column. One of the use case where virtual ports can be used is. • The virtual ip represents a load balancer vip and the virtual parents provide load balancer service in an active-standby setup with the active virtual parent owning the virtual ip. remote A remote port is to model a port that resides remotely on another OVN, which is on the other side of a transit log‐ ical switch for OVN interconnection. This type of ports are created by ovn-ic instead of by CMS. Any change to the port will be automatically overwritten by ovn-ic. Options: options: map of string-string pairs This column provides key/value settings specific to the logical port type. The type-specific options are described individually below. Options for router ports: These options apply when type is router. options : router-port: optional string Required. The name of the Logical_Router_Port to which this log‐ ical switch port is connected. options : nat-addresses: optional string This is used to send gratuitous ARPs for SNAT and DNAT IP ad‐ dresses via the localnet port that is attached to the same logi‐ cal switch as this type router port. This option is specified on a logical switch port that is connected to a gateway router, or a logical switch port that is connected to a distributed gateway port on a logical router. This must take one of the following forms: router Gratuitous ARPs will be sent for all SNAT and DNAT exter‐ nal IP addresses and for all load balancer IP addresses defined on the options:router-port’s logical router, us‐ ing the options:router-port’s MAC address. This form of options:nat-addresses is valid for logical switch ports where options:router-port is the name of a port on a gateway router, or the name of a distributed gateway port. Supported only in OVN 2.8 and later. Earlier versions re‐ quired NAT addresses to be manually synchronized. Ethernet address followed by one or more IPv4 addresses Example: 80:fa:5b:06:72:b7 158.36.44.22 158.36.44.24. This would result in generation of gratuitous ARPs for IP addresses 158.36.44.22 and 158.36.44.24 with a MAC ad‐ dress of 80:fa:5b:06:72:b7. This form of options:nat-addresses is only valid for log‐ ical switch ports where options:router-port is the name of a port on a gateway router. options : exclude-lb-vips-from-garp: optional string If options:nat-addresses is set to router, Gratuitous ARPs will be sent for all SNAT and DNAT external IP addresses defined on the options:router-port’s logical router, using the op‐ tions:router-port’s MAC address, not cosidering configured load balancers. options : arp_proxy: optional string Optional. A list of MAC and addresses/cidrs or just ad‐ dresses/cidrs that this logical switch router port will reply to ARP/NDP requests. Examples: 169.254.239.254 169.254.239.2, 0a:58:a9:fe:01:01 169.254.239.254 169.254.239.2 169.254.238.0/24, fd7b:6b4d:7b25:d22f::1 fd7b:6b4d:7b25:d22f::2, 0a:58:a9:fe:01:01 fd7b:6b4d:7b25:d22f::0/64. Theoptions:router- port’s logical router should have a route to forward packets sent to configured proxy ARP MAC/IPs to an appropriate destina‐ tion. options : enable_router_port_acl: optional string, either true or false Optional. Enable conntrack for the router port whose peer is l3dgw_port if set to true. The default value is false. Options for localnet ports: These options apply when type is localnet. options : network_name: optional string Required. The name of the network to which the localnet port is connected. Each hypervisor, via ovn-controller, uses its local configuration to determine exactly how to connect to this lo‐ cally accessible network, if at all. options : ethtype: optional string Optional. VLAN EtherType field value for encapsulating VLAN headers. Supported values: 802.1q (default), 802.1ad. options : localnet_learn_fdb: optional string, either true or false Optional. Allows localnet port to learn MACs and store them in FDB table if set to true. The default value is false. Options for l2gateway ports: These options apply when type is l2gateway. options : network_name: optional string Required. The name of the network to which the l2gateway port is connected. The L2 gateway, via ovn-controller, uses its local configuration to determine exactly how to connect to this net‐ work. options : l2gateway-chassis: optional string Required. The chassis on which the l2gateway logical port should be bound to. ovn-controller running on the defined chassis will connect this logical port to the physical network. Options for vtep ports: These options apply when type is vtep. options : vtep-physical-switch: optional string Required. The name of the VTEP gateway. options : vtep-logical-switch: optional string Required. A logical switch name connected by the VTEP gateway. VMI (or VIF) Options: These options apply to logical ports with type having (empty string) options : requested-chassis: optional string If set, identifies a specific chassis (by name or hostname) that is allowed to bind this port. Using this option will prevent thrashing between two chassis trying to bind the same port dur‐ ing a live migration. It can also prevent similar thrashing due to a mis-configuration, if a port is accidentally created on more than one chassis. If set to a comma separated list, the first entry identifies the main chassis and the rest are one or more additional chassis that are allowed to bind the same port. When multiple chassis are set for the port, and the logical switch is connected to an external network through a localnet port, tunneling is enforced for the port to guarantee delivery of packets directed to the port to all its locations. This has MTU implications because the network used for tunneling must have MTU larger than localnet for stable connectivity. If the same host co-hosts more than one controller instance (ei‐ ther belonging to the same or separate clusters), special atten‐ tion should be given to consistently using unique chassis names used in this option. It is advised that chassis names - and not host names - are used for this option. options : activation-strategy: optional string If used with multiple chassis set in requested-chassis, speci‐ fies an activation strategy for all additional chassis. By de‐ fault, no activation strategy is used, meaning additional port locations are immediately available for use. When set to "rarp", the port is blocked for ingress and egress communication until a RARP packet is sent from a new location. The "rarp" strategy is useful in live migration scenarios for virtual machines. options : iface-id-ver: optional string If set, this port will be bound by ovn-controller only if this same key and value is configured in the external_ids column in the Open_vSwitch database’s Interface table. options : qos_min_rate: optional string If set, indicates the minimum guaranteed rate available for data sent from this interface, in bit/s. options : qos_max_rate: optional string If set, indicates the maximum rate for data sent from this in‐ terface, in bit/s. The traffic will be shaped according to this limit. options : qos_burst: optional string If set, indicates the maximum burst size for data sent from this interface, in bits. options : hostname: optional string If set, indicates the DHCPv4 option "Hostname" (option code 12) associated for this Logical Switch Port. If DHCPv4 is enabled for this Logical Switch Port, hostname dhcp option will be in‐ cluded in DHCP reply. options : pkt_clone_type: optional string, must be mc_unknown If set to mc_unknown, packets going to this VIF get cloned to all unknown ports connected to the same Logical Switch. VIF Plugging Options: options : vif-plug-type: optional string If set, OVN will attempt to perform plugging of this VIF. In or‐ der to get this port plugged by the OVN controller, OVN must be built with support for VIF plugging. The default behavior is for the CMS to do the VIF plugging. Each VIF plug provider have their own options namespaced by name, for example "vif-plug:rep‐ resentor:key". Please refer to the VIF plug provider documenta‐ tion located in Documentation/topics/vif-plug-providers/ for more information. options : vif-plug-mtu-request: optional string Requested MTU for plugged interfaces. When set the OVN con‐ troller will fill the mtu_request column of the Open vSwitch database’s Interface table. This in turn will make OVS vswitchd update the MTU of the linked interface. Virtual port Options: These options apply when type is virtual. options : virtual-ip: optional string This option represents the virtual IPv4 address. options : virtual-parents: optional string This options represents a set of logical port names (with in the same logical switch) which can own the virtual ip configured in the options:virtual-ip. All these virtual parents should add the virtual ip in the port_security if port security addressed are enabled. IP Multicast Snooping Options: These options apply when the port is part of a logical switch which has other_config :mcast_snoop set to true. options : mcast_flood: optional string, either true or false If set to true, multicast packets (except reports) are uncondi‐ tionally forwarded to the specific port. Default: false. options : mcast_flood_reports: optional string, either true or false If set to true, multicast reports are unconditionally forwarded to the specific port. Default: false. Containers: When a large number of containers are nested within a VM, it may be too expensive to dedicate a VIF to each container. OVN can use VLAN tags to support such cases. Each container is assigned a VLAN ID and each packet that passes between the hypervisor and the VM is tagged with the appropriate ID for the container. Such VLAN IDs never appear on a phys‐ ical wire, even inside a tunnel, so they need not be unique except rel‐ ative to a single VM on a hypervisor. These columns are used for VIFs that represent nested containers using shared VIFs. For VMs and for containers that have dedicated VIFs, they are empty. parent_name: optional string The VM interface through which the nested container sends its network traffic. This must match the name column for some other Logical_Switch_Port. Note: for performance of the OVN Southbound database conditional monitoring, unlike for regular VIFs, ovn-controller will register to get updates about all OVN South‐ bound database Port_Binding table records that correspond to nested container ports even if external_ids:ovn-monitor-all is set to false. See ovn-controller(8) for more information. tag_request: optional integer, in range 0 to 4,095 The VLAN tag in the network traffic associated with a con‐ tainer’s network interface. The client can request ovn-northd to allocate a tag that is unique within the scope of a specific parent (specified in parent_name) by setting a value of 0 in this column. The allocated value is written by ovn-northd in the tag column. (Note that these tags are allocated and managed lo‐ cally in ovn-northd, so they cannot be reconstructed in the event that the database is lost.) The client can also request a specific non-zero tag and ovn-northd will honor it and copy that value to the tag column. When type is set to localnet or l2gateway, this can be set to indicate that the port represents a connection to a specific VLAN on a locally accessible network. The VLAN ID is used to match incoming traffic and is also added to outgoing traffic. tag: optional integer, in range 1 to 4,095 The VLAN tag allocated by ovn-northd based on the contents of the tag_request column. Port State: up: optional boolean This column is populated by ovn-northd, rather than by the CMS plugin as is most of this database. When a logical port is bound to a physical location in the OVN Southbound database Binding table, ovn-northd sets this column to true; otherwise, or if the port becomes unbound later, it sets it to false. If this column is empty, the port is not considered up. This allows the CMS to wait for a VM’s (or container’s) networking to become active be‐ fore it allows the VM (or container) to start. Logical ports of router type are an exception to this rule. They are considered to be always up, that is this column is always set to true. enabled: optional boolean This column is used to administratively set port state. If this column is empty or is set to true, the port is enabled. If this column is set to false, the port is disabled. A disabled port has all ingress and egress traffic dropped. Addressing: addresses: set of strings Addresses owned by the logical port. Each element in the set must take one of the following forms: Ethernet address followed by zero or more IPv4 or IPv6 addresses (or both) An Ethernet address defined is owned by the logical port. Like a physical Ethernet NIC, a logical port ordinarily has a single fixed Ethernet address. When a OVN logical switch processes a unicast Ethernet frame whose destination MAC address is in a logical port’s addresses column, it delivers it only to that port, as if a MAC learning process had learned that MAC address on the port. If IPv4 or IPv6 address(es) (or both) are defined, it in‐ dicates that the logical port owns the given IP ad‐ dresses. If IPv4 address(es) are defined, the OVN logical switch uses this information to synthesize responses to ARP re‐ quests without traversing the physical network. The OVN logical router connected to the logical switch, if any, uses this information to avoid issuing ARP requests for logical switch ports. Note that the order here is important. The Ethernet ad‐ dress must be listed before the IP address(es) if de‐ fined. Examples: 80:fa:5b:06:72:b7 This indicates that the logical port owns the above mac address. 80:fa:5b:06:72:b7 10.0.0.4 20.0.0.4 This indicates that the logical port owns the mac address and two IPv4 addresses. 80:fa:5b:06:72:b7 fdaa:15f2:72cf:0:f816:3eff:fe20:3f41 This indicates that the logical port owns the mac address and 1 IPv6 address. 80:fa:5b:06:72:b7 10.0.0.4 fdaa:15f2:72cf:0:f816:3eff:fe20:3f41 This indicates that the logical port owns the mac address and 1 IPv4 address and 1 IPv6 address. unknown This indicates that the logical port has an unknown set of Ethernet addresses. When an OVN logical switch processes a unicast Ethernet frame whose destination MAC address is not in any logical port’s addresses column, it delivers it to the port (or ports) whose addresses columns include unknown. dynamic Use dynamic to make ovn-northd generate a globally unique MAC address, choose an unused IPv4 address with the logi‐ cal port’s subnet (if other_config:subnet is set in the port’s Logical_Switch), and generate an IPv6 address from the MAC address (if other_config:ipv6_prefix is set in the port’s Logical_Switch) and store them in the port’s dynamic_addresses column. Only one element containing dynamic may appear in ad‐ dresses. dynamic ip dynamic ipv6 dynamic ip ipv6 These act like dynamic alone but specify particular IPv4 or IPv6 addresses to use. OVN IPAM will still automatically allocate the other address if configured appropriately. Ex‐ ample: dynamic 192.168.0.1 2001::1. mac dynamic This acts like dynamic alone but specifies a particular MAC address to use. OVN IPAM will still automatically allocate IPv4 or IPv6 addresses, or both, if configured appropri‐ ately. Example: 80:fa:5b:06:72:b7 dynamic router Accepted only when type is router. This indicates that the Ethernet, IPv4, and IPv6 addresses for this logical switch port should be obtained from the connected logical router port, as specified by router-port in options. The resulting addresses are used to populate the logical switch’s destination lookup, and also for the logical switch to generate ARP and ND replies. If the connected logical router port has a distributed gateway port specified and the logical router has rules specified in nat with external_mac, then those addresses are also used to populate the switch’s destination lookup. Supported only in OVN 2.7 and later. Earlier versions re‐ quired router addresses to be manually synchronized. dynamic_addresses: optional string Addresses assigned to the logical port by ovn-northd, if dynamic is specified in addresses. Addresses will be of the same format as those that populate the addresses column. Note that dynami‐ cally assigned addresses are constructed and managed locally in ovn-northd, so they cannot be reconstructed in the event that the database is lost. port_security: set of strings This column controls the addresses from which the host attached to the logical port (``the host’’) is allowed to send packets and to which it is allowed to receive packets. If this column is empty, all addresses are permitted. Each element in the set must begin with one Ethernet address. This would restrict the host to sending packets from and receiv‐ ing packets to the ethernet addresses defined in the logical port’s port_security column. It also restricts the inner source MAC addresses that the host may send in ARP and IPv6 Neighbor Discovery packets. The host is always allowed to receive packets to multicast and broadcast Ethernet addresses. Each element in the set may additionally contain one or more IPv4 or IPv6 addresses (or both), with optional masks. If a mask is given, it must be a CIDR mask. In addition to the restric‐ tions described for Ethernet addresses above, such an element restricts the IPv4 or IPv6 addresses from which the host may send and to which it may receive packets to the specified ad‐ dresses. A masked address, if the host part is zero, indicates that the host is allowed to use any address in the subnet; if the host part is nonzero, the mask simply indicates the size of the subnet. In addition: • If any IPv4 address is given, the host is also allowed to receive packets to the IPv4 local broadcast address 255.255.255.255 and to IPv4 multicast addresses (224.0.0.0/4). If an IPv4 address with a mask is given, the host is also allowed to receive packets to the broad‐ cast address in that specified subnet. If any IPv4 address is given, the host is additionally restricted to sending ARP packets with the specified source IPv4 address. (RARP is not restricted.) • If any IPv6 address is given, the host is also allowed to receive packets to IPv6 multicast addresses (ff00::/8). If any IPv6 address is given, the host is additionally restricted to sending IPv6 Neighbor Discovery Solicita‐ tion or Advertisement packets with the specified source address or, for solicitations, the unspecified address. If an element includes an IPv4 address, but no IPv6 addresses, then IPv6 traffic is not allowed. If an element includes an IPv6 address, but no IPv4 address, then IPv4 and ARP traffic is not allowed. This column uses the same lexical syntax as the match column in the OVN Southbound database’s Pipeline table. Multiple addresses within an element may be space or comma separated. This column is provided as a convenience to cloud management systems, but all of the features that it implements can be im‐ plemented as ACLs using the ACL table. Examples: 80:fa:5b:06:72:b7 The host may send traffic from and receive traffic to the specified MAC address, and to receive traffic to Ethernet multicast and broadcast addresses, but not otherwise. The host may not send ARP or IPv6 Neighbor Discovery packets with inner source Ethernet addresses other than the one specified. 80:fa:5b:06:72:b7 192.168.1.10/24 This adds further restrictions to the first example. The host may send IPv4 packets from or receive IPv4 packets to only 192.168.1.10, except that it may also receive IPv4 packets to 192.168.1.255 (based on the subnet mask), 255.255.255.255, and any address in 224.0.0.0/4. The host may not send ARPs with a source Ethernet address other than 80:fa:5b:06:72:b7 or source IPv4 address other than 192.168.1.10. The host may not send or receive any IPv6 (including IPv6 Neighbor Discovery) traffic. "80:fa:5b:12:42:ba", "80:fa:5b:06:72:b7 192.168.1.10/24" The host may send traffic from and receive traffic to the specified MAC addresses, and to receive traffic to Ether‐ net multicast and broadcast addresses, but not otherwise. With MAC 80:fa:5b:12:42:ba, the host may send traffic from and receive traffic to any L3 address. With MAC 80:fa:5b:06:72:b7, the host may send IPv4 packets from or receive IPv4 packets to only 192.168.1.10, except that it may also receive IPv4 packets to 192.168.1.255 (based on the subnet mask), 255.255.255.255, and any address in 224.0.0.0/4. The host may not send or receive any IPv6 (including IPv6 Neighbor Discovery) traffic. DHCP: dhcpv4_options: optional weak reference to DHCP_Options This column defines the DHCPv4 Options to be included by the ovn-controller when it replies to the DHCPv4 requests. Please see the DHCP_Options table. dhcpv6_options: optional weak reference to DHCP_Options This column defines the DHCPv6 Options to be included by the ovn-controller when it replies to the DHCPv6 requests. Please see the DHCP_Options table. mirror_rules: set of weak reference to Mirrors Mirror rules that apply to logical switch port which is the source. Please see the Mirror table. ha_chassis_group: optional HA_Chassis_Group References a row in the OVN Northbound database’s HA_Chas‐ sis_Group table. It indicates the HA chassis group to use if the type is set to external. If type is not external, this column is ignored. Naming: external_ids : neutron:port_name: optional string This column gives an optional human-friendly name for the port. This name has no special meaning or purpose other than to pro‐ vide convenience for human interaction with the northbound data‐ base. Neutron copies this from its own port object’s name. (Neutron ports do are not assigned human-friendly names by default, so it will often be empty.) Tunnel Key: options : requested-tnl-key: optional string, containing an integer, in range 1 to 32,767 Configures the port binding tunnel key for the port. Usually this is not needed because ovn-northd will assign an unique key for each port by itself. However, if it is configured, ovn-northd honors the configured value. The typical use case is for interconnection: the tunnel keys for ports on transit switches need to be unique globally, so they are maintained in the global OVN_IC_Southbound database, and ovn-ic simply syncs the value from OVN_IC_Southbound through this config. Common Columns: external_ids: map of string-string pairs See External IDs at the beginning of this document. The ovn-northd program copies all these pairs into the exter‐ nal_ids column of the Port_Binding table in OVN_Southbound data‐ base. Forwarding_Group TABLE Each row represents one forwarding group. Summary: name string vip string vmac string liveness boolean child_port set of 1 or more strings Common Columns: external_ids map of string-string pairs Details: name: string A name for the forwarding group. This name has no special mean‐ ing or purpose other than to provide convenience for human in‐ teraction with the ovn-nb database. vip: string The virtual IP address assigned to the forwarding group. It will respond with vmac when an ARP request is sent for vip. vmac: string The virtual MAC address assigned to the forwarding group. liveness: boolean If set to true, liveness is enabled for child ports otherwise it is disabled. child_port: set of 1 or more strings List of child ports in the forwarding group. Common Columns: external_ids: map of string-string pairs See External IDs at the beginning of this document. Address_Set TABLE Each row in this table represents a named set of addresses. An address set may contain Ethernet, IPv4, or IPv6 addresses with optional bitwise or CIDR masks. Address set may ultimately be used in ACLs to compare against fields such as ip4.src or ip6.src. A single address set must contain addresses of the same type. As an example, the following would create an address set with three IP addresses: ovn-nbctl create Address_Set name=set1 addresses=’10.0.0.1 10.0.0.2 10.0.0.3’ Address sets may be used in the match column of the ACL table. For syn‐ tax information, see the details of the expression language used for the match column in the Logical_Flow table of the OVN_Southbound data‐ base. Summary: name string (must be unique within table) addresses set of strings Common Columns: external_ids map of string-string pairs Details: name: string (must be unique within table) A name for the address set. Names are ASCII and must match [a-zA-Z_.][a-zA-Z_.0-9]*. addresses: set of strings The set of addresses in string form. Common Columns: external_ids: map of string-string pairs See External IDs at the beginning of this document. Port_Group TABLE Each row in this table represents a named group of logical switch ports. Port groups may be used in the match column of the ACL table. For syn‐ tax information, see the details of the expression language used for the match column in the Logical_Flow table of the OVN_Southbound data‐ base. For each port group, there are two address sets generated to the Ad‐ dress_Set table of the OVN_Southbound database, containing the IP ad‐ dresses of the group of ports, one for IPv4, and the other for IPv6, with name being the name of the Port_Group followed by a suffix _ip4 for IPv4 and _ip6 for IPv6. The generated address sets can be used in the same way as regular address sets in the match column of the ACL ta‐ ble. For syntax information, see the details of the expression language used for the match column in the Logical_Flow table of the OVN_South‐ bound database. Summary: name string (must be unique within table) ports set of weak reference to Logi‐ cal_Switch_Ports acls set of ACLs Common Columns: external_ids map of string-string pairs Details: name: string (must be unique within table) A name for the port group. Names are ASCII and must match [a-zA-Z_.][a-zA-Z_.0-9]*. ports: set of weak reference to Logical_Switch_Ports The logical switch ports belonging to the group in uuids. acls: set of ACLs Access control rules that apply to the port group. Applying an ACL to a port group has the same effect as applying the ACL to all logical lswitches that the ports of the port group belong to. Common Columns: external_ids: map of string-string pairs See External IDs at the beginning of this document. Load_Balancer TABLE Each row represents one load balancer. Summary: name string vips map of string-string pairs protocol optional string, one of sctp, tcp, or udp Health Checks: health_check set of Load_Balancer_Health_Checks ip_port_mappings map of string-string pairs selection_fields set of strings, one of eth_dst, eth_src, ip_dst, ip_src, tp_dst, or tp_src Common Columns: external_ids map of string-string pairs Load_Balancer options: options : reject optional string, either true or false options : hairpin_snat_ip optional string options : skip_snat optional string options : add_route optional string options : neighbor_responder optional string options : template optional string options : address-family optional string options : affinity_timeout optional string options : ct_flush optional string, either true or false Details: name: string A name for the load balancer. This name has no special meaning or purpose other than to provide convenience for human interac‐ tion with the ovn-nb database. vips: map of string-string pairs A map of virtual IP addresses (and an optional port number with : as a separator) associated with this load balancer and their corresponding endpoint IP addresses (and optional port numbers with : as separators) separated by commas. If the destination IP address (and port number) of a packet leaving a container or a VM matches the virtual IP address (and port number) provided here as a key, then OVN will statefully replace the destination IP address by one of the provided IP address (and port number) in this map as a value. IPv4 and IPv6 addresses are supported for load balancing; however a VIP of one address family may not be mapped to a destination IP address of a different family. If specifying an IPv6 address with a port, the address portion must be enclosed in square brackets. Examples for keys are "192.168.1.4" and "[fd0f::1]:8800". Examples for value are "10.0.0.1, 10.0.0.2" and "20.0.0.10:8800, 20.0.0.11:8800". When the Load_Balancer is added to the logical_switch, the VIP has to be in a different subnet than the one used for the logi‐ cal_switch. Since VIP is in a different subnet, you should con‐ nect your logical switch to either a OVN logical router or a real router (this is because the client can now send a packet with VIP as the destination IP address and router’s mac address as the destination MAC address). protocol: optional string, one of sctp, tcp, or udp Valid protocols are tcp, udp, or sctp. This column is useful when a port number is provided as part of the vips column. If this column is empty and a port number is provided as part of vips column, OVN assumes the protocol to be tcp. Health Checks: OVN supports health checks for load balancer endpoints. When health checks are enabled, the load balancer uses only healthy endpoints. Suppose that vips contains a key-value pair 10.0.0.10:80=10.0.0.4:8080,20.0.0.4:8080. To enable health checks for this virtual’s endpoints, add two key-value pairs to ip_port_mappings, with keys 10.0.0.4 and 20.0.0.4, and add to health_check a reference to a Load_Balancer_Health_Check row whose vip is set to 10.0.0.10. The same approach can be used for IPv6 as well. health_check: set of Load_Balancer_Health_Checks Load balancer health checks associated with this load balancer. ip_port_mappings: map of string-string pairs Maps from endpoint IP to a colon-separated pair of logical port name and source IP, e.g. port_name:sourc_ip for IPv4. Health checks are sent to this port with the specified source IP. For IPv6 square brackets must be used around IP address, e.g: port_name:[sourc_ip] For example, in the example above, IP to port mappings might be defined as 10.0.0.4=sw0-p1:10.0.0.2 and 20.0.0.4=sw1-p1:20.0.0.2, if the values given were suitable ports and IP addresses. For IPv6 IP to port mappings might be defined as [2001::1]=sw0-p1:[2002::1]. selection_fields: set of strings, one of eth_dst, eth_src, ip_dst, ip_src, tp_dst, or tp_src OVN native load balancers are supported using the OpenFlow groups of type select. OVS supports two selection methods: dp_hash and hash (with optional fields specified) in selecting the buckets of a group. Please see the OVS documentation (man ovs-ofctl) for more details on the selection methods. Each end‐ point IP (and port if set) is mapped to a bucket in the group flow. CMS can choose the hash selection method by setting the selec‐ tion fields in this column. ovs-vswitchd uses the specified fields in generating the hash. dp_hash selection method uses the assistance of datapath to cal‐ culate the hash and it is expected to be faster than hash selec‐ tion method. So CMS should take this into consideration before using the hash method. Please consult the OVS documentation and OVS sources for the implementation details. Common Columns: external_ids: map of string-string pairs See External IDs at the beginning of this document. Load_Balancer options: options : reject: optional string, either true or false If the load balancer is created with --reject option and it has no active backends, a TCP reset segment (for tcp) or an ICMP port unreachable packet (for all other kind of traffic) will be sent whenever an incoming packet is received for this load-bal‐ ancer. Please note using --reject option will disable empty_lb SB controller event for this load balancer. options : hairpin_snat_ip: optional string IP to be used as source IP for packets that have been hair- pinned after load balancing. The default behavior when the op‐ tion is not set is to use the load balancer VIP as source IP. This option may have exactly one IPv4 and/or one IPv6 address on it, separated by a space character. options : skip_snat: optional string If the load balancing rule is configured with skip_snat option, the option lb_force_snat_ip configured for the logical router that references this load balancer will not be applied for this load balancer. options : add_route: optional string If set to true, then neighbor routers will have logical flows added that will allow for routing to the VIP IP. It also will have ARP resolution logical flows added. By setting this option, it means there is no reason to create a Logical_Router_Sta‐ tic_Route from neighbor routers to this NAT address. It also means that no ARP request is required for neighbor routers to learn the IP-MAC mapping for this VIP IP. For more information about what flows are added for IP routes, please see the ovn-northd manpage section on IP Routing. options : neighbor_responder: optional string If set to all, then routers on which the load balancer is ap‐ plied reply to ARP/neighbor discovery requests for all VIPs of the load balancer. If set to reachable, then routers on which the load balancer is applied reply to ARP/neighbor discovery re‐ quests only for VIPs that are part of a router’s subnet. If set to none, then routers on which the load balancer is applied never reply to ARP/neighbor discovery requests for any of the load balancer VIPs. Load balancers with options:template=true do not support reachable as a valid mode. The default value of this option, if not specified, is reachable for regular load bal‐ ancers and none for template load balancers. options : template: optional string Option to be set to true, if the load balancer is a template. The load balancer VIPs and backends must be using Chassis_Tem‐ plate_Var in their definitions. Load balancer template VIP supported formats are: ^VIP_VAR[:^PORT_VAR|:port] where VIP_VAR and PORT_VAR are keys of the Chassis_Template_Var variables records. Note: The VIP and PORT cannot be combined into a single template variable. For example, a Chassis_Template_Var variable expanding to 10.0.0.1:8080 is not valid if used as VIP. Load balancer template backend supported formats are: ^BACKEND_VAR1[:^PORT_VAR1|:port],^BACKEND_VAR2[:^PORT_VAR2|:port] or ^BACKENDS_VAR1,^BACKENDS_VAR2 where BACKEND_VAR1, PORT_VAR1, BACKEND_VAR2, PORT_VAR2, BACK‐ ENDS_VAR1 and BACKENDS_VAR2 are keys of the Chassis_Template_Var variables records. options : address-family: optional string Address family used by the load balancer. Supported values are ipv4 and ipv6. The address-family is only used for load bal‐ ancers with options:template=true. For explicit load balancers, setting the address-family has no effect. options : affinity_timeout: optional string If the CMS provides a positive value (in seconds) for affin‐ ity_timeout, OVN will dnat connections received from the same client to this lb to the same backend if received in the affin‐ ity timeslot. Max supported affinity_timeout is 65535 seconds. options : ct_flush: optional string, either true or false The value indicates whether ovn-controller should flush CT en‐ tries that are related to this LB. The flush happens if the LB is removed, any of the backends is updated/removed or the LB is not considered local anymore by the ovn-controller. This option is set to false by default. Load_Balancer_Group TABLE Each row represents a logical grouping of load balancers. It is up to the CMS to decide the criteria on which load balancers are grouped to‐ gether. To simplify configuration and to optimize its processing load balancers that must be associated to the same set of logical switches and/or logical routers should be grouped together. Summary: name string (must be unique within table) load_balancer set of weak reference to Load_Balancers Details: name: string (must be unique within table) A name for the load balancer group. This name has no special meaning or purpose other than to provide convenience for human interaction with the ovn-nb database. load_balancer: set of weak reference to Load_Balancers A set of load balancers. Load_Balancer_Health_Check TABLE Each row represents one load balancer health check. Summary: vip string Health check options: options : interval optional string, containing an integer options : timeout optional string, containing an integer options : success_count optional string, containing an integer options : failure_count optional string, containing an integer Common Columns: external_ids map of string-string pairs Details: vip: string vip whose endpoints should be monitored for health check. Health check options: options : interval: optional string, containing an integer The interval, in seconds, between health checks. options : timeout: optional string, containing an integer The time, in seconds, after which a health check times out. options : success_count: optional string, containing an integer The number of successful checks after which the endpoint is con‐ sidered online. options : failure_count: optional string, containing an integer The number of failure checks after which the endpoint is consid‐ ered offline. Common Columns: external_ids: map of string-string pairs See External IDs at the beginning of this document. ACL TABLE Each row in this table represents one ACL rule for a logical switch or a port group that points to it through its acls column. The action col‐ umn for the highest-priority matching row in this table determines a packet’s treatment. If no row matches, packets are allowed by default. (Default-deny treatment is possible: add a rule with priority 0, 1 as match, and deny as action.) Summary: label integer, in range 0 to 4,294,967,295 priority integer, in range 0 to 32,767 direction string, either from-lport or to-lport match string action string, one of allow-related, al‐ low-stateless, allow, drop, pass, or re‐ ject tier integer, in range 0 to 3 options: options : apply-after-lb optional string Logging: log boolean name optional string, at most 63 characters long severity optional string, one of alert, debug, info, notice, or warning meter optional string Common Columns: options map of string-string pairs ACL configuration options: options : log-related optional string external_ids map of string-string pairs Details: label: integer, in range 0 to 4,294,967,295 Associates an identifier with the ACL. The same value will be written to corresponding connection tracker entry. The value should be a valid 32-bit unsigned integer. This value can help in debugging from connection tracker side. For example, through this "label" we can backtrack to the ACL rule which is causing a "leaked" connection. Connection tracker entries are created only for allowed connections so the label is valid only for allow and allow-related actions. priority: integer, in range 0 to 32,767 The ACL rule’s priority. Rules with numerically higher priority take precedence over those with lower. If two ACL rules with the same priority both match, then the one actually applied to a packet is undefined. Return traffic from an allow-related flow is always allowed and cannot be changed through an ACL. allow-stateless flows always take precedence before stateful ACLs, regardless of their priority. (Both allow and allow-re‐ lated ACLs can be stateful.) direction: string, either from-lport or to-lport Direction of the traffic to which this rule should apply: • from-lport: Used to implement filters on traffic arriving from a logical port. These rules are applied to the logi‐ cal switch’s ingress pipeline. • to-lport: Used to implement filters on traffic forwarded to a logical port. These rules are applied to the logical switch’s egress pipeline. match: string The packets that the ACL should match, in the same expression language used for the match column in the OVN Southbound data‐ base’s Logical_Flow table. The outport logical port is only available in the to-lport direction (the inport is available in both directions). By default all traffic is allowed. When writing a more restric‐ tive policy, it is important to remember to allow flows such as ARP and IPv6 neighbor discovery packets. Note that you can not create an ACL matching on a port with type=router or type=localnet. action: string, one of allow-related, allow-stateless, allow, drop, pass, or reject The action to take when the ACL rule matches: • allow-stateless: Always forward the packet in stateless manner, omitting connection tracking mechanism, regard‐ less of other rules defined for the switch. May require defining additional rules for inbound replies. For exam‐ ple, if you define a rule to allow outgoing TCP traffic directed to an IP address, then you probably also want to define another rule to allow incoming TCP traffic coming from this same IP address. In addition, traffic that matches stateless ACLs will bypass load-balancer DNAT/un- DNAT processing. Stateful ACLs should be used instead if the traffic is supposed to be load-balanced. • allow: Forward the packet. It will also send the packets through connection tracking when allow-related rules ex‐ ist on the logical switch. Otherwise, it’s equivalent to allow-stateless. • allow-related: Forward the packet and related traffic (e.g. inbound replies to an outbound connection). • drop: Silently drop the packet. • reject: Drop the packet, replying with a RST for TCP or ICMPv4/ICMPv6 unreachable message for other IPv4/IPv6-based protocols. • pass: Pass to the next ACL tier. If using multiple ACL tiers, a match on this ACL will stop evaluating ACLs at the current tier and move to the next one. If not using ACL tiers or if a pass ACL is matched at the final tier, then the options:default_acl_drop option from the NB_Global table is used to determine how to proceed. tier: integer, in range 0 to 3 The hierarchical tier that this ACL belongs to. ACLs can be assigned to numerical tiers. When evaluating ACLs, an internal counter is used to determine which tier of ACLs should be evaluated. Tier 0 ACLs are evaluated first. If no ver‐ dict can be determined, then tier 1 ACLs are evaluated next. This continues until the maximum tier value is reached. If all tiers of ACLs are evaluated and no verdict is reached, then the options:default_acl_drop option from table NB_Global is used to determine how to proceed. In this version of OVN, the maximum tier value for ACLs is 3, meaning there are 4 tiers of ACLs allowed (0-3). options: ACLs options. options : apply-after-lb: optional string If set to true, the ACL will be applied after load balancing stage. Supported only for from-lport direction. The main use case of this option is to support ACLs matching on the destination IP address of the packet for the backend IPs of load balancers. OVN will apply the from-lport ACLs in two stages. ACLs without this option apply-after-lb set, will be applied before the load balancer stage and ACLs with this option set will be applied af‐ ter the load balancer stage. The priorities are indepedent be‐ tween these stages and may not be obvious to the CMS. Hence CMS should be extra careful when using this option and should care‐ fully evaluate the priorities of all the ACLs and the default deny/allow ACLs if any. Logging: These columns control whether and how OVN logs packets that match an ACL. log: boolean If set to true, packets that match the ACL will trigger a log message on the transport node or nodes that perform ACL process‐ ing. Logging may be combined with any action. If set to false, the remaining columns in this group have no significance. name: optional string, at most 63 characters long This name, if it is provided, is included in log records. It provides the administrator and the cloud management system a way to associate a log record with a particular ACL. severity: optional string, one of alert, debug, info, notice, or warn‐ ing The severity of the ACL. The severity levels match those of sys‐ log, in decreasing level of severity: alert, warning, notice, info, or debug. When the column is empty, the default is info. meter: optional string The name of a meter to rate-limit log messages for the ACL. The string must match the name column of a row in the Meter table. By default, log messages are not rate-limited. In order to en‐ sure that the same Meter rate limits multiple ACL logs sepa‐ rately, set the fair column. Common Columns: options: map of string-string pairs This column provides general key/value settings. The supported options are described individually below. ACL configuration options: options : log-related: optional string If set to true, then log when reply or related traffic is admit‐ ted from a stateful ACL. In order for this option to function, the log option must be set to true and a label must be set, and it must be unique to the ACL. The label is necessary as it is the only means to associate the reply traffic with the ACL to which it belongs. It must be unique, because otherwise it is am‐ biguous which ACL will be matched. Note: If this option is en‐ abled, an extra flow is installed in order to log the related traffic. Therefore, if this is enabled on all ACLs, then the to‐ tal number of flows necessary to log the ACL traffic is doubled, compared to if this option is not enabled. external_ids: map of string-string pairs See External IDs at the beginning of this document. Logical_Router TABLE Each row represents one L3 logical router. Summary: ports set of Logical_Router_Ports static_routes set of Logical_Router_Static_Routes policies set of Logical_Router_Policys enabled optional boolean nat set of NATs load_balancer set of weak reference to Load_Balancers load_balancer_group set of Load_Balancer_Groups Naming: name string external_ids : neutron:router_name optional string copp optional weak reference to Copp Options: options : chassis optional string options : dnat_force_snat_ip optional string options : lb_force_snat_ip optional string options : mcast_relay optional string, either true or false options : dynamic_neigh_routers optional string, either true or false options : always_learn_from_arp_request optional string, either true or false options : requested-tnl-key optional string, containing an integer, in range 1 to 16,777,215 options : snat-ct-zone optional string, containing an integer, in range 0 to 65,535 options : mac_binding_age_threshold optional string Common Columns: external_ids map of string-string pairs Details: ports: set of Logical_Router_Ports The router’s ports. static_routes: set of Logical_Router_Static_Routes Zero or more static routes for the router. policies: set of Logical_Router_Policys Zero or more routing policies for the router. enabled: optional boolean This column is used to administratively set router state. If this column is empty or is set to true, the router is enabled. If this column is set to false, the router is disabled. A dis‐ abled router has all ingress and egress traffic dropped. nat: set of NATs One or more NAT rules for the router. NAT rules only work on Gateway routers, and on distributed routers with one and only one distributed gateway port. load_balancer: set of weak reference to Load_Balancers Set of load balancers associated to this logical router. Load balancer Load balancer rules only work on the Gateway routers or routers with one and only one distributed gateway port. load_balancer_group: set of Load_Balancer_Groups Set of load balancers groups associated to this logical router. Naming: These columns provide names for the logical router. From OVN’s perspec‐ tive, these names have no special meaning or purpose other than to pro‐ vide convenience for human interaction with the northbound database. There is no requirement for the name to be unique. (For a unique iden‐ tifier for a logical router, use its row UUID.) (Originally, name was intended to serve the purpose of a human-friendly name, but the Neutron integration used it to uniquely identify its own router object, in the format neutron-uuid. Later on, Neutron started propagating the friendly name of a router as external_ids:neu‐ tron:router_name. Perhaps this can be cleaned up someday.) name: string A name for the logical router. external_ids : neutron:router_name: optional string Another name for the logical router. copp: optional weak reference to Copp The control plane protection policy from table Copp used for me‐ tering packets sent to ovn-controller from logical ports of this router. Options: Additional options for the logical router. options : chassis: optional string If set, indicates that the logical router in question is a Gate‐ way router (which is centralized) and resides in the set chas‐ sis. The same value is also used by ovn-controller to uniquely identify the chassis in the OVN deployment and comes from exter‐ nal_ids:system-id in the Open_vSwitch table of Open_vSwitch database. The Gateway router can only be connected to a distributed router via a switch if SNAT and DNAT are to be configured in the Gate‐ way router. options : dnat_force_snat_ip: optional string If set, indicates a set of IP addresses to use to force SNAT a packet that has already been DNATed in the gateway router. When multiple gateway routers are configured, a packet can poten‐ tially enter any of the gateway router, get DNATted and eventu‐ ally reach the logical switch port. For the return traffic to go back to the same gateway router (for unDNATing), the packet needs a SNAT in the first place. This can be achieved by setting the above option with a gateway specific set of IP addresses. This option may have exactly one IPv4 and/or one IPv6 address on it, separated by a a space. options : lb_force_snat_ip: optional string If set, this option can take two possible type of values. Either a set of IP addresses or the string value - router_ip. If a set of IP addresses are configured, it indicates to use to force SNAT a packet that has already been load-balanced in the gateway router. When multiple gateway routers are configured, a packet can potentially enter any of the gateway routers, get DNATted as part of the load-balancing and eventually reach the logical switch port. For the return traffic to go back to the same gateway router (for unDNATing), the packet needs a SNAT in the first place. This can be achieved by setting the above op‐ tion with a gateway specific set of IP addresses. This option may have exactly one IPv4 and/or one IPv6 address on it, sepa‐ rated by a space character. If it is configured with the value router_ip, then the load bal‐ anced packet is SNATed with the IP of router port (attached to the gateway router) selected as the destination after taking the routing decision. options : mcast_relay: optional string, either true or false Enables/disables IP multicast relay between logical switches connected to the logical router. Default: False. options : dynamic_neigh_routers: optional string, either true or false If set to true, the router will resolve neighbor routers’ MAC addresses only by dynamic ARP/ND, instead of prepopulating sta‐ tic mappings for all neighbor routers in the ARP/ND Resolution stage. This reduces number of flows, but requires ARP/ND mes‐ sages to resolve the IP-MAC bindings when needed. It is false by default. It is recommended to set to true when a large number of logical routers are connected to the same logical switch but most of them never need to send traffic between each other. By default, ovn-northd does not create mappings to NAT and load balancer addresess. However, for NAT and load balancer addresses that have the add_route option added, ovn-northd will create logical flows that map NAT and load balancer IP addresses to the appropriate MAC address. Setting dynamic_neigh_routers to true will prevent the automatic creation of these logical flows. options : always_learn_from_arp_request: optional string, either true or false This option controls the behavior when handling IPv4 ARP re‐ quests or IPv6 ND-NS packets - whether a dynamic neighbor (MAC binding) entry is added/updated. true - Always learn the MAC-IP binding, and add/update the MAC binding entry. false - If there is a MAC binding for that IP and the MAC is different, or, if TPA of ARP request belongs to any router port on this router, then update/add that MAC-IP binding. Otherwise, don’t update/add entries. It is true by default. It is recommended to set to false when a large number of logical routers are connected to the same logi‐ cal switch but most of them never need to send traffic between each other, to reduce the size of the MAC binding table. options : requested-tnl-key: optional string, containing an integer, in range 1 to 16,777,215 Configures the datapath tunnel key for the logical router. This is not needed because ovn-northd will assign an unique key for each datapath by itself. However, if it is configured, ovn-northd honors the configured value. options : snat-ct-zone: optional string, containing an integer, in range 0 to 65,535 Use the requested conntrack zone for SNAT with this router. This can be useful if egress traffic from the host running OVN comes from both OVN and other sources. This way, OVN and the other sources can make use of the same conntrack zone. options : mac_binding_age_threshold: optional string Specifies the MAC binding aging thresholds based on CIDRs, with the format: entry[;entry[...]], where each entry has the format: [cidr:]threshold • cidr: Can be either an IPv4 or IPv6 CIDR. • threshold: Threshold value in seconds. MAC bindings with IP addresses matching the specified CIDR that exceed this timeout will be automatically removed. If an entry is provided without an CIDR (just the threshold value), it specifies the default threshold for MAC bindings that don’t match any of the given CIDRs. If there are multiple de‐ fault threshold entries in the option, the behavior is unde‐ fined. If there are multiple CIDRs matching a MAC binding IP, the one with the longest prefix length takes effect. If there are multi‐ ple entries with the same CIDR in the option, the behavior is undefined. If no matching CIDR is found for a MAC binding IP, and no de‐ fault threshold is specified, the behavior defaults to the orig‐ inal: the binding will not be removed based on age. The value can also default to an empty string, which means that the aging threshold is disabled. Any string not in the above format is regarded as invalid and the aging is disabled. Example: 192.168.0.0/16:300;192.168.10.0/24:0;fe80::/10:600;1200 This sets a threshold of 300 seconds for MAC bindings with IP addresses in the 192.168.0.0/16 range, excluding the 192.168.1.0/24 range (for which the aging is disabled), a threshold of 600 seconds for MAC bindings with IP addresses in the fe80::/10 IPv6 range, and a default threshold of 1200 sec‐ onds for all other MAC bindings. Common Columns: external_ids: map of string-string pairs See External IDs at the beginning of this document. QoS TABLE Each row in this table represents one QoS rule for a logical switch that points to it through its qos_rules column. Two types of QoS are supported: DSCP marking and metering. A match with the highest-priority will have QoS applied to it. If the action column is specified, then matching packets will have DSCP marking applied. If the bandwidth col‐ umn is specified, then matching packets will have metering applied. ac‐ tion and bandwidth are not exclusive, so both marking and metering by defined for the same QoS entry. If no row matches, packets will not have any QoS applied. Summary: priority integer, in range 0 to 32,767 direction string, either from-lport or to-lport match string action map of string-integer pairs, key either dscp or mark, value in range 0 to 4,294,967,295 bandwidth map of string-integer pairs, key either burst or rate, value in range 1 to 4,294,967,295 external_ids map of string-string pairs Details: priority: integer, in range 0 to 32,767 The QoS rule’s priority. Rules with numerically higher priority take precedence over those with lower. If two QoS rules with the same priority both match, then the one actually applied to a packet is undefined. direction: string, either from-lport or to-lport The value of this field is similar to ACL column in the OVN Northbound database’s ACL table. match: string The packets that the QoS rules should match, in the same expres‐ sion language used for the match column in the OVN Southbound database’s Logical_Flow table. The outport logical port is only available in the to-lport direction (the inport is available in both directions). action: map of string-integer pairs, key either dscp or mark, value in range 0 to 4,294,967,295 When dscp action is specified, matching flows will have have DSCP marking applied. When mark action is specified, matching flows will have packet marking applied. • dscp: The value of this action should be in the range of 0 to 63 (inclusive). • mark: The value of this action should be a positive inte‐ ger. bandwidth: map of string-integer pairs, key either burst or rate, value in range 1 to 4,294,967,295 When specified, matching packets will have bandwidth metering applied. Traffic over the limit will be dropped. • rate: The value of rate limit in kbps. • burst: The value of burst rate limit in kilobits. This is optional and needs to specify the rate. external_ids: map of string-string pairs See External IDs at the beginning of this document. Mirror TABLE Each row in this table represents a mirror that can be used for port mirroring. These mirrors are referenced by the mirror_rules column in the Logical_Switch_Port table. Summary: name string (must be unique within table) filter string, one of both, from-lport, or to-lport sink string type string, one of erspan, gre, or local index integer external_ids map of string-string pairs Details: name: string (must be unique within table) Represents the name of the mirror. filter: string, one of both, from-lport, or to-lport The value of this field represents selection criteria of the mirror. to-lport mirrors the packets coming into logical port. from-lport mirrors the packets going out of logical port. both mirrors for both directions. sink: string The value of this field represents the destination/sink of the mirror. If the type is gre or erspan, the value indicates the tunnel remote IP (either IPv4 or IPv6). For a type of local, this field defines a local interface on the OVS integration bridge to be used as the mirror destination. The interface must possess external-ids:mirror-id that matches this string. type: string, one of erspan, gre, or local The value of this field specifies the mirror type - gre, erspan or local. index: integer The value of this field represents the tunnel ID. If the config‐ ured tunnel type is gre, this field represents the GRE key value and if the configured tunnel type is erspan it represents the erspan_idx value. It is ignored if the type is local. external_ids: map of string-string pairs See External IDs at the beginning of this document. Meter TABLE Each row in this table represents a meter that can be used for QoS or rate-limiting. Summary: name string (must be unique within table) unit string, either kbps or pktps bands set of 1 or more Meter_Bands fair optional boolean external_ids map of string-string pairs Details: name: string (must be unique within table) A name for this meter. Names that begin with "__" (two underscores) are reserved for OVN internal use and should not be added manually. unit: string, either kbps or pktps The unit for rate and burst_rate parameters in the bands entry. kbps specifies kilobits per second, and pktps specifies packets per second. bands: set of 1 or more Meter_Bands The bands associated with this meter. Each band specifies a rate above which the band is to take the action action. If multiple bands’ rates are exceeded, then the band with the highest rate among the exceeded bands is selected. fair: optional boolean This column is used to further describe the desired behavior of the meter when there are multiple references to it. If this col‐ umn is empty or is set to false, the rate will be shared across all rows that refer to the same Meter name. Conversely, when this column is set to true, each user of the same Meter will be rate-limited on its own. external_ids: map of string-string pairs See External IDs at the beginning of this document. Meter_Band TABLE Each row in this table represents a meter band which specifies the rate above which the configured action should be applied. These bands are referenced by the bands column in the Meter table. Summary: action string, must be drop rate integer, in range 1 to 4,294,967,295 burst_size integer, in range 0 to 4,294,967,295 external_ids map of string-string pairs Details: action: string, must be drop The action to execute when this band matches. The only supported action is drop. rate: integer, in range 1 to 4,294,967,295 The rate limit for this band, in kilobits per second or bits per second, depending on whether the parent Meter entry’s unit col‐ umn specified kbps or pktps. burst_size: integer, in range 0 to 4,294,967,295 The maximum burst allowed for the band in kilobits or packets, depending on whether kbps or pktps was selected in the parent Meter entry’s unit column. If the size is zero, the switch is free to select some reasonable value depending on its configura‐ tion. external_ids: map of string-string pairs See External IDs at the beginning of this document. Logical_Router_Port TABLE A port within an L3 logical router. Exactly one Logical_Router row must reference a given logical router port. Summary: name string (must be unique within table) networks set of 1 or more strings mac string enabled optional boolean Distributed Gateway Ports: ha_chassis_group optional HA_Chassis_Group gateway_chassis set of Gateway_Chassises Options for Physical VLAN MTU Issues: options : reside-on-redirect-chassis optional string, either true or false options : redirect-type optional string, either bridged or over‐ lay ipv6_prefix set of strings ipv6_ra_configs: ipv6_ra_configs : address_mode optional string ipv6_ra_configs : router_preference optional string ipv6_ra_configs : route_info optional string ipv6_ra_configs : mtu optional string ipv6_ra_configs : send_periodic optional string ipv6_ra_configs : max_interval optional string ipv6_ra_configs : min_interval optional string ipv6_ra_configs : rdnss optional string ipv6_ra_configs : dnssl optional string Options: options : mcast_flood optional string, either true or false options : requested-tnl-key optional string, containing an integer, in range 1 to 32,767 options : prefix_delegation optional string, either true or false options : prefix optional string, either true or false options : route_table optional string options : gateway_mtu optional string, containing an integer, in range 68 to 65,535 options : gateway_mtu_bypass optional string Attachment: peer optional string Common Columns: external_ids map of string-string pairs Status: status : hosting-chassis optional string Details: name: string (must be unique within table) A name for the logical router port. In addition to provide convenience for human interaction with the northbound database, this column is used as reference by its patch port in Logical_Switch_Port or another logical router port in Logical_Router_Port. A logical router port may not have the same name as a logical switch port, but the database schema cannot enforce this. networks: set of 1 or more strings The IP addresses and netmasks of the router. For example, 192.168.0.1/24 indicates that the router’s IP address is 192.168.0.1 and that packets destined to 192.168.0.x should be routed to this port. A logical router port always adds a link-local IPv6 address (fe80::/64) automatically generated from the interface’s MAC ad‐ dress using the modified EUI-64 format. mac: string The Ethernet address that belongs to this router port. enabled: optional boolean This column is used to administratively set port state. If this column is empty or is set to true, the port is enabled. If this column is set to false, the port is disabled. A disabled port has all ingress and egress traffic dropped. Distributed Gateway Ports: Gateways, as documented under Gateways in the OVN architecture guide, provide limited connectivity between logical networks and physical ones. OVN support multiple kinds of gateways. The Logical_Router_Port table can be used two different ways to configure distributed gateway ports, which are one kind of gateway. These two forms of configuration exist for historical reasons. Both of them produce the same kind of OVN southbound records and the same behavior in practice. If either of these are set, this logical router port represents a dis‐ tributed gateway port that connects this router to a logical switch with a localnet port or a connection to another OVN deployment. Also mentioned in the OVN architecture guide, distributed gateway ports can also be used for scalability reasons in deployments where logical switches are dedicated to chassises rather than distributed. The preferred way to configure a gateway is ha_chassis_group, but gate‐ way_chassis is also supported for backward compatibility. Only one of these should be set at a time on a given LRP, since they configure the same features. Even when a gateway is configured, the logical router port still effec‐ tively resides on each chassis. However, due to the implications of the use of L2 learning in the physical network, as well as the need to sup‐ port advanced features such as one-to-many NAT (aka IP masquerading), a subset of the logical router processing is handled in a centralized manner on the gateway chassis. There can be more than one distributed gateway ports configured on each logical router, each connecting to different L2 segments. Load-balanc‐ ing is not yet supported on logical routers with more than one distrib‐ uted gateway ports. For each distributed gateway port, it may have more than one gateway chassises. When more than one gateway chassis is specified, OVN only uses one at a time. OVN can rely on OVS BFD implementation to monitor gateway connectivity, preferring the highest-priority gateway that is online. Priorities are specified in the priority column of Gate‐ way_Chassis or HA_Chassis. ovn-northd programs the external_mac rules specified in the LRP’s LR into the peer logical switch’s destination lookup on the chassis where the logical_port resides. In addition, the logical router’s MAC address is automatically programmed in the peer logical switch’s destination lookup flow on the gateway chasssis. If it is desired to generate gra‐ tuitous ARPs for NAT addresses, then set the peer LSP’s options:nat-ad‐ dresses to router. OVN 20.03 and earlier supported a third way to configure distributed gateway ports using options:redirect-chassis to specify the gateway chassis. This method is no longer supported. Any remaining users should switch to one of the newer methods instead. A gateway_chassis may be easily configured from the command line, e.g. ovn-nbctl lrp-set-gate‐ way-chassis lrp chassis. ha_chassis_group: optional HA_Chassis_Group Designates an HA_Chassis_Group to provide gateway high avail‐ ability. gateway_chassis: set of Gateway_Chassises Designates one or more Gateway_Chassis for the logical router port. Options for Physical VLAN MTU Issues: MTU issues arise in mixing tunnels with logical networks that are bridged to a physical VLAN. For an explanation of the MTU issues, see Physical VLAN MTU Issues in the OVN architecture document. The follow‐ ing options, which are alternatives, provide solutions. Both of them cause packets to be sent over localnet instead of tunnels, but they differ in whether some or all packets are sent this way. The most prominent tradeoff between these options is that reside-on-redi‐ rect-chassis is easier to configure and that redirect-type performs better for east-west traffic. options : reside-on-redirect-chassis: optional string, either true or false If set to true, this option forces all traffic across the logi‐ cal router port to pass through the gateway chassis using a hop across a localnet port. This changes behavior in two ways: • Without this option, east-west traffic passes directly between source and destination chassis (or even within a single chassis, for co-located VMs). With this option, all east-west traffic passes through the gateway chassis. • Without this option, traffic between the gateway chassis and other chassis is encapsulated in tunnels. With this option, traffic passes over a localnet interface. This option may usefully be set only on logical router ports that connect a distributed logical router to a logical switch with VIFs. It should not be set on a distributed gateway port. OVN honors this option only if the logical router has one and only one distributed gateway port and if the LRP’s peer switch has a localnet port. options : redirect-type: optional string, either bridged or overlay If set to bridged on a distributed gateway port, this option causes OVN to redirect packets to the gateway chassis over a lo‐ calnet port instead of a tunnel. The relevant chassis must share a localnet port. This feature requires the administrator or the CMS to configure each participating chassis with a unique Ethernet address for the logical router by setting ovn-chassis-mac-mappings in the Open vSwitch database, for use by ovn-controller. Setting this option to overlay or leaving it unset has no ef‐ fect. This option may usefully be set only on a distributed gateway port when there is one and only one distributed gateway port on the logical router. It is otherwise ignored. ipv6_prefix: set of strings This column contains IPv6 prefix obtained by prefix delegation router according to RFC 3633 ipv6_ra_configs: This column defines the IPv6 ND RA address mode and ND MTU Option to be included by ovn-controller when it replies to the IPv6 Router solicita‐ tion requests. ipv6_ra_configs : address_mode: optional string The address mode to be used for IPv6 address configuration. The supported values are: • slaac: Address configuration using Router Advertisement (RA) packet. The IPv6 prefixes defined in the Logi‐ cal_Router_Port table’s networks column will be included in the RA’s ICMPv6 option - Prefix information. • dhcpv6_stateful: Address configuration using DHCPv6. • dhcpv6_stateless: Address configuration using Router Ad‐ vertisement (RA) packet. Other IPv6 options are provided by DHCPv6. ipv6_ra_configs : router_preference: optional string Default Router Preference (PRF) indicates whether to prefer this router over other default routers (RFC 4191). Possible values are: • HIGH: mapped to 0x01 in RA PRF field • MEDIUM: mapped to 0x00 in RA PRF field • LOW: mapped to 0x11 in RA PRF field ipv6_ra_configs : route_info: optional string Route Info is used to configure Route Info Option sent in Router Advertisement according to RFC 4191. Route Info is a comma sepa‐ rated string where each field provides PRF and prefix for a given route (e.g: HIGH-aef1::11/48,LOW-aef2::11/96) Possible PRF values are: • HIGH: mapped to 0x01 in RA PRF field • MEDIUM: mapped to 0x00 in RA PRF field • LOW: mapped to 0x11 in RA PRF field ipv6_ra_configs : mtu: optional string The recommended MTU for the link. Default is 0, which means no MTU Option will be included in RA packet replied by ovn-con‐ troller. Per RFC 2460, the mtu value is recommended no less than 1280, so any mtu value less than 1280 will be considered as no MTU Option. ipv6_ra_configs : send_periodic: optional string If set to true, then this router interface will send router ad‐ vertisements periodically. The default is false. ipv6_ra_configs : max_interval: optional string The maximum number of seconds to wait between sending periodic router advertisements. This option has no effect if ipv6_ra_con‐ figs:send_periodic is false. The default is 600. ipv6_ra_configs : min_interval: optional string The minimum number of seconds to wait between sending periodic router advertisements. This option has no effect if ipv6_ra_con‐ figs:send_periodic is false. The default is one-third of ipv6_ra_configs:max_interval, i.e. 200 seconds if that key is unset. ipv6_ra_configs : rdnss: optional string IPv6 address of RDNSS server announced in RA packets. At the mo‐ ment OVN supports just one RDNSS server. ipv6_ra_configs : dnssl: optional string DNS Search List announced in RA packets. Multiple DNS Search List must be ’comma’ separated (e.g. "a.b.c, d.e.f") Options: Additional options for the logical router port. options : mcast_flood: optional string, either true or false If set to true, multicast traffic (including reports) are uncon‐ ditionally forwarded to the specific port. This option applies when the port is part of a logical router which has options:mcast_relay set to true. Default: false. options : requested-tnl-key: optional string, containing an integer, in range 1 to 32,767 Configures the port binding tunnel key for the port. Usually this is not needed because ovn-northd will assign an unique key for each port by itself. However, if it is configured, ovn-northd honors the configured value. options : prefix_delegation: optional string, either true or false If set to true, enable IPv6 prefix delegation state machine on this logical router port (RFC3633). IPv6 prefix delegation is available just on a gateway router or on a gateway router port. options : prefix: optional string, either true or false If set to true, this interface will receive an IPv6 prefix ac‐ cording to RFC3663 options : route_table: optional string Designates lookup Logical_Router_Static_Routes with specified route_table value. Routes to directly connected networks from same Logical Router and routes without route_table option set have higher priority than routes with route_table option set. options : gateway_mtu: optional string, containing an integer, in range 68 to 65,535 If set, logical flows will be added to router pipeline to check packet length. If packet length is greater than the value set, ICMPv4 type 3 (Destination Unreachable) code 4 (Fragmentation Needed and Don’t Fragment was Set) or ICMPv6 type 2 (Packet Too Big) code 0 (no route to destination) packets will be generated. This allows for Path MTU Discovery. options : gateway_mtu_bypass: optional string When configured, represents a match expression, in the same ex‐ pression language used for the match column in the OVN South‐ bound database’s Logical_Flow table. Packets matching this ex‐ pression will bypass the length check configured through the op‐ tions:gateway_mtu option. Attachment: A given router port serves one of two purposes: • To attach a logical switch to a logical router. A logical router port of this type is referenced by exactly one Logical_Switch_Port of type router. The value of name is set as router-port in column options of Logi‐ cal_Switch_Port. In this case peer column is empty. • To connect one logical router to another. This requires a pair of logical router ports, each connected to a differ‐ ent router. Each router port in the pair specifies the other in its peer column. No Logical_Switch refers to the router port. peer: optional string For a router port used to connect two logical routers, this identifies the other router port in the pair by name. For a router port attached to a logical switch, this column is empty. Common Columns: external_ids: map of string-string pairs See External IDs at the beginning of this document. The ovn-northd program copies all these pairs into the exter‐ nal_ids column of the Port_Binding table in OVN_Southbound data‐ base. Status: Additional status about the logical router port. status : hosting-chassis: optional string This option is populated by ovn-northd. When a distributed gateway port is bound to a location in the OVN Southbound database Port_Binding ovn-northd will populate this key with the name of the Chassis that is currently hosting this port. Logical_Router_Static_Route TABLE Each record represents a static route. When multiple routes match a packet, the longest-prefix match is cho‐ sen. For a given prefix length, a dst-ip route is preferred over a src-ip route. When there are ECMP routes, i.e. multiple routes with same prefix and policy, one of them will be selected based on the 5-tuple hashing of the packet header. Summary: ip_prefix string policy optional string, either dst-ip or src-ip nexthop string output_port optional string bfd optional weak reference to BFD route_table string external_ids : ic-learned-route optional string Common Columns: external_ids map of string-string pairs Common options: options map of string-string pairs options : ecmp_symmetric_reply optional string options : origin optional string Details: ip_prefix: string IP prefix of this route (e.g. 192.168.100.0/24). policy: optional string, either dst-ip or src-ip If it is specified, this setting describes the policy used to make routing decisions. This setting must be one of the follow‐ ing strings: • src-ip: This policy sends the packet to the nexthop when the packet’s source IP address matches ip_prefix. • dst-ip: This policy sends the packet to the nexthop when the packet’s destination IP address matches ip_prefix. If not specified, the default is dst-ip. nexthop: string Nexthop IP address for this route. Nexthop IP address should be the IP address of a connected router port or the IP address of a logical port or can be set to discard for dropping packets which match the given route. output_port: optional string The name of the Logical_Router_Port via which the packet needs to be sent out. This is optional and when not specified, OVN will automatically figure this out based on the nexthop. When this is specified and there are multiple IP addresses on the router port and none of them are in the same subnet of nexthop, OVN chooses the first IP address as the one via which the nex‐ thop is reachable. bfd: optional weak reference to BFD Reference to BFD row if the route has associated a BFD session route_table: string Any string to place route to separate routing table. If Logical Router Port has configured value in options:route_table other than empty string, OVN performs route lookup for all packets en‐ tering Logical Router ingress pipeline from this port in the following manner: • 1. First lookup among "global" routes: routes without route_table value set and routes to directly connected networks. • 2. Next lookup among routes with same route_table value as specified in LRP’s options:route_table field. external_ids : ic-learned-route: optional string ovn-ic populates this key if the route is learned from the global OVN_IC_Southbound database. In this case the value will be set to the uuid of the row in Route table of the OVN_IC_Southbound database. Common Columns: external_ids: map of string-string pairs See External IDs at the beginning of this document. Common options: options: map of string-string pairs This column provides general key/value settings. The supported options are described individually below. options : ecmp_symmetric_reply: optional string If true, then new traffic that arrives over this route will have its reply traffic bypass ECMP route selection and will be sent out this route instead. Note that this option overrides any rules set in the Logical_Router_policy table. This option only works on gateway routers (routers that have options:chassis set). options : origin: optional string In case ovn-interconnection has been learned this route, it will have its origin set: either "connected" or "static". This key is supposed to be written only by ovn-ic daemon. ovn-northd then checks this value when generating Logical Flows. Logi‐ cal_Router_Static_Route records with same ip_prefix within same Logical Router will have next lookup order based on origin key value: 1. connected 2. static Logical_Router_Policy TABLE Each row in this table represents one routing policy for a logical router that points to it through its policies column. The action column for the highest-priority matching row in this table determines a packet’s treatment. If no row matches, packets are allowed by default. (Default-deny treatment is possible: add a rule with priority 0, 1 as match, and drop as action.) Summary: priority integer, in range 0 to 32,767 match string action string, one of allow, drop, or reroute nexthop optional string nexthops set of strings bfd_sessions set of weak reference to BFDs options : pkt_mark optional string Common Columns: external_ids map of string-string pairs Details: priority: integer, in range 0 to 32,767 The routing policy’s priority. Rules with numerically higher priority take precedence over those with lower. A rule is uniquely identified by the priority and match string. match: string The packets that the routing policy should match, in the same expression language used for the match column in the OVN South‐ bound database’s Logical_Flow table. By default all traffic is allowed. When writing a more restric‐ tive policy, it is important to remember to allow flows such as ARP and IPv6 neighbor discovery packets. action: string, one of allow, drop, or reroute The action to take when the routing policy matches: • allow: Forward the packet. • drop: Silently drop the packet. • reroute: Reroute packet to nexthop or nexthops. nexthop: optional string Note: This column is deprecated in favor of nexthops. Next-hop IP address for this route, which should be the IP ad‐ dress of a connected router port or the IP address of a logical port. nexthops: set of strings Next-hop ECMP IP addresses for this route. Each IP in the list should be the IP address of a connected router port or the IP address of a logical port. One IP from the list is selected as next hop. bfd_sessions: set of weak reference to BFDs Reference to BFD row if the route policy has associated some BFD sessions. options : pkt_mark: optional string Marks the packet with the value specified when the router policy is applied. CMS can inspect this packet marker and take some de‐ cisions if desired. This value is not preserved when the packet goes out on the wire. Common Columns: external_ids: map of string-string pairs See External IDs at the beginning of this document. NAT TABLE Each record represents a NAT rule. Summary: type string, one of dnat, dnat_and_snat, or snat external_ip string external_mac optional string external_port_range string logical_ip string logical_port optional string allowed_ext_ips optional Address_Set exempted_ext_ips optional Address_Set gateway_port optional weak reference to Logi‐ cal_Router_Port options : stateless optional string options : add_route optional string Common Columns: external_ids map of string-string pairs Details: type: string, one of dnat, dnat_and_snat, or snat Type of the NAT rule. • When type is dnat, the externally visible IP address ex‐ ternal_ip is DNATted to the IP address logical_ip in the logical space. • When type is snat, IP packets with their source IP ad‐ dress that either matches the IP address in logical_ip or is in the network provided by logical_ip is SNATed into the IP address in external_ip. • When type is dnat_and_snat, the externally visible IP ad‐ dress external_ip is DNATted to the IP address logical_ip in the logical space. In addition, IP packets with the source IP address that matches logical_ip is SNATed into the IP address in external_ip. external_ip: string An IPv4 address. external_mac: optional string A MAC address. This is only used on the gateway port on distributed routers. This must be specified in order for the NAT rule to be processed in a distributed manner on all chassis. If this is not specified for a NAT rule on a distributed router, then this NAT rule will be processed in a centralized manner on the gateway port in‐ stance on the gateway chassis. This MAC address must be unique on the logical switch that the gateway port is attached to. If the MAC address used on the log‐ ical_port is globally unique, then that MAC address can be spec‐ ified as this external_mac. external_port_range: string L4 source port range Range of ports, from which a port number will be picked that will replace the source port of to be NATed packet. This is ba‐ sically PAT (port address translation). Value of the column is in the format, port_lo-port_hi. For exam‐ ple: external_port_range : "1-30000" Valid range of ports is 1-65535. logical_ip: string An IPv4 network (e.g 192.168.1.0/24) or an IPv4 address. logical_port: optional string The name of the logical port where the logical_ip resides. This is only used on distributed routers. This must be specified in order for the NAT rule to be processed in a distributed man‐ ner on all chassis. If this is not specified for a NAT rule on a distributed router, then this NAT rule will be processed in a centralized manner on the gateway port instance on the gateway chassis. allowed_ext_ips: optional Address_Set It represents Address Set of external ips that NAT rule is ap‐ plicable to. For SNAT type NAT rules, this refers to destination addresses. For DNAT type NAT rules, this refers to source ad‐ dresses. This configuration overrides the default NAT behavior of apply‐ ing a rule solely based on internal IP. Without this configura‐ tion, NAT happens without considering the external IP (i.e dest/source for snat/dnat type rule). With this configuration NAT rule is applied ONLY if external ip is in the input Address Set. exempted_ext_ips: optional Address_Set It represents Address Set of external ips that NAT rule is NOT applicable to. For SNAT type NAT rules, this refers to destina‐ tion addresses. For DNAT type NAT rules, this refers to source addresses. This configuration overrides the default NAT behavior of apply‐ ing a rule solely based on internal IP. Without this configura‐ tion, NAT happens without considering the external IP (i.e dest/source for snat/dnat type rule). With this configuration NAT rule is NOT applied if external ip is in the input Address Set. If there are NAT rules in a logical router with overlapping IP prefixes (including /32), then usage of exempted_ext_ips should be avoided in following scenario. a. SNAT rule (let us say RULE1) with logical_ip PREFIX/MASK (let us say 50.0.0.0/24). b. SNAT rule (let us say RULE2) with logical_ip PREFIX/MASK+1 (let us say 50.0.0.0/25). c. Now, if exempted_ext_ips is associated with RULE2, then a logical ip which matches both 50.0.0.0/24 and 50.0.0.0/25 may get the RULE2 applied to it instead of RULE1. allowed_ext_ips and exempted_ext_ips are mutually exclusive to each other. If both Address Sets are set for a rule, then the NAT rule is not considered. gateway_port: optional weak reference to Logical_Router_Port A distributed gateway port in the Logical_Router_Port table where the NAT rule needs to be applied. When multiple distributed gateway ports are configured on a Log‐ ical_Router, applying a NAT rule at each of the distributed gateway ports might not be desired. Consider the case where a logical router has 2 distributed gateway port, one with networks 50.0.0.10/24 and the other with networks 60.0.0.10/24. If the logical router has a NAT rule of type snat, logical_ip 10.1.1.0/24 and external_ip 50.1.1.20/24, the rule needs to be selectively applied on matching packets entering/leaving through the distributed gateway port with networks 50.0.0.10/24. When a logical router has multiple distributed gateway ports and this column is not set for a NAT rule, then the rule will be ap‐ plied at the distributed gateway port which is in the same net‐ work as the external_ip of the NAT rule, if such a router port exists. If logical router has a single distributed gateway port and this column is not set for a NAT rule, the rule will be ap‐ plied at the distributed gateway port even if the router port is not in the same network as the external_ip of the NAT rule. options : stateless: optional string Indicates if a dnat_and_snat rule should lead to connection tracking state or not. options : add_route: optional string If set to true, then neighbor routers will have logical flows added that will allow for routing to the NAT address. It also will have ARP resolution logical flows added. By setting this option, it means there is no reason to create a Logi‐ cal_Router_Static_Route from neighbor routers to this NAT ad‐ dress. It also means that no ARP request is required for neigh‐ bor routers to learn the IP-MAC mapping for this NAT address. This option only applies to NATs of type dnat and dnat_and_snat. For more information about what flows are added for IP routes, please see the ovn-northd manpage section on IP Routing. Common Columns: external_ids: map of string-string pairs See External IDs at the beginning of this document. DHCP_Options TABLE OVN implements native DHCPv4 support which caters to the common use case of providing an IPv4 address to a booting instance by providing stateless replies to DHCPv4 requests based on statically configured ad‐ dress mappings. To do this it allows a short list of DHCPv4 options to be configured and applied at each compute host running ovn-controller. OVN also implements native DHCPv6 support which provides stateless replies to DHCPv6 requests. Summary: cidr string DHCPv4 options: Mandatory DHCPv4 options: options : server_id optional string options : server_mac optional string options : lease_time optional string, containing an integer, in range 0 to 4,294,967,295 IPv4 DHCP Options: options : router optional string options : netmask optional string options : dns_server optional string options : log_server optional string options : lpr_server optional string options : swap_server optional string options : policy_filter optional string options : router_solicitation optional string options : nis_server optional string options : ntp_server optional string options : netbios_name_server optional string options : classless_static_route optional string options : ms_classless_static_route optional string options : next_server optional string Boolean DHCP Options: options : ip_forward_enable optional string, either 0 or 1 options : router_discovery optional string, either 0 or 1 options : ethernet_encap optional string, either 0 or 1 Integer DHCP Options: options : default_ttl optional string, containing an integer, in range 0 to 255 options : tcp_ttl optional string, containing an integer, in range 0 to 255 options : mtu optional string, containing an integer, in range 68 to 65,535 options : T1 optional string, containing an integer, in range 68 to 4,294,967,295 options : T2 optional string, containing an integer, in range 68 to 4,294,967,295 options : arp_cache_timeout optional string, containing an integer, in range 0 to 255 options : tcp_keepalive_interval optional string, containing an integer, in range 0 to 255 options : netbios_node_type optional string, containing an integer, in range 0 to 255 String DHCP Options: options : wpad optional string options : bootfile_name optional string options : path_prefix optional string options : tftp_server_address optional string options : hostname optional string options : domain_name optional string options : bootfile_name_alt optional string options : broadcast_address optional string DHCP Options of type host_id: options : tftp_server optional string DHCP Options of type domains: options : domain_search_list optional string DHCPv6 options: Mandatory DHCPv6 options: options : server_id optional string IPv6 DHCPv6 options: options : dns_server optional string String DHCPv6 options: options : domain_search optional string options : dhcpv6_stateless optional string options : fqdn optional string Common Columns: external_ids map of string-string pairs Details: cidr: string The DHCPv4/DHCPv6 options will be included if the logical port has its IP address in this cidr. DHCPv4 options: The CMS should define the set of DHCPv4 options as key/value pairs in the options column of this table. For ovn-controller to include these DHCPv4 options, the dhcpv4_options of Logical_Switch_Port should refer to an entry in this table. Mandatory DHCPv4 options: The following options must be defined. options : server_id: optional string The IP address for the DHCP server to use. This should be in the subnet of the offered IP. This is also included in the DHCP of‐ fer as option 54, ``server identifier.’’ options : server_mac: optional string The Ethernet address for the DHCP server to use. options : lease_time: optional string, containing an integer, in range 0 to 4,294,967,295 The offered lease time in seconds, The DHCPv4 option code for this option is 51. IPv4 DHCP Options: Below are the supported DHCPv4 options whose values are an IPv4 ad‐ dress, e.g. 192.168.1.1. Some options accept multiple IPv4 addresses enclosed within curly braces, e.g. {192.168.1.2, 192.168.1.3}. Please refer to RFC 2132 for more details on DHCPv4 options and their codes. options : router: optional string The IP address of a gateway for the client to use. This should be in the subnet of the offered IP. The DHCPv4 option code for this option is 3. options : netmask: optional string The DHCPv4 option code for this option is 1. options : dns_server: optional string The DHCPv4 option code for this option is 6. options : log_server: optional string The DHCPv4 option code for this option is 7. options : lpr_server: optional string The DHCPv4 option code for this option is 9. options : swap_server: optional string The DHCPv4 option code for this option is 16. options : policy_filter: optional string The DHCPv4 option code for this option is 21. options : router_solicitation: optional string The DHCPv4 option code for this option is 32. options : nis_server: optional string The DHCPv4 option code for this option is 41. options : ntp_server: optional string The DHCPv4 option code for this option is 42. options : netbios_name_server: optional string The DHCPv4 option code for this option is 44. options : classless_static_route: optional string The DHCPv4 option code for this option is 121. This option can contain one or more static routes, each of which consists of a destination descriptor and the IP address of the router that should be used to reach that destination. Please see RFC 3442 for more details. Example: {30.0.0.0/24,10.0.0.10, 0.0.0.0/0,10.0.0.1} options : ms_classless_static_route: optional string The DHCPv4 option code for this option is 249. This option is similar to classless_static_route supported by Microsoft Windows DHCPv4 clients. options : next_server: optional string The DHCPv4 option code for setting the "Next server IP address" field in the DHCP header. Boolean DHCP Options: These options accept a Boolean value, expressed as 0 for false or 1 for true. options : ip_forward_enable: optional string, either 0 or 1 The DHCPv4 option code for this option is 19. options : router_discovery: optional string, either 0 or 1 The DHCPv4 option code for this option is 31. options : ethernet_encap: optional string, either 0 or 1 The DHCPv4 option code for this option is 36. Integer DHCP Options: These options accept a nonnegative integer value. options : default_ttl: optional string, containing an integer, in range 0 to 255 The DHCPv4 option code for this option is 23. options : tcp_ttl: optional string, containing an integer, in range 0 to 255 The DHCPv4 option code for this option is 37. options : mtu: optional string, containing an integer, in range 68 to 65,535 The DHCPv4 option code for this option is 26. options : T1: optional string, containing an integer, in range 68 to 4,294,967,295 This specifies the time interval from address assignment until the client begins trying to renew its address. The DHCPv4 option code for this option is 58. options : T2: optional string, containing an integer, in range 68 to 4,294,967,295 This specifies the time interval from address assignment until the client begins trying to rebind its address. The DHCPv4 op‐ tion code for this option is 59. options : arp_cache_timeout: optional string, containing an integer, in range 0 to 255 The DHCPv4 option code for this option is 35. This option speci‐ fies the timeout in seconds for ARP cache entries. options : tcp_keepalive_interval: optional string, containing an inte‐ ger, in range 0 to 255 The DHCPv4 option code for this option is 38. This option speci‐ fies the interval that the client TCP should wait before sending a keepalive message on a TCP connection. options : netbios_node_type: optional string, containing an integer, in range 0 to 255 The DHCPv4 option code for this option is 46. String DHCP Options: These options accept a string value. options : wpad: optional string The DHCPv4 option code for this option is 252. This option is used as part of web proxy auto discovery to provide a URL for a web proxy. options : bootfile_name: optional string The DHCPv4 option code for this option is 67. This option is used to identify a bootfile. options : path_prefix: optional string The DHCPv4 option code for this option is 210. In PXELINUX’ case this option is used to set a common path prefix, instead of de‐ riving it from the bootfile name. options : tftp_server_address: optional string The DHCPv4 option code for this option is 150. The option con‐ tains one or more IPv4 addresses that the client MAY use. This option is Cisco proprietary, the IEEE standard that matches with this requirement is option 66 (tftp_server). options : hostname: optional string The DHCPv4 option code for this option is 12. If set, indicates the DHCPv4 option "Hostname". Alternatively, this option can be configured in options:hostname column in table Logi‐ cal_Switch_Port. If Hostname option value is set in both con‐ flicting Logical_Switch_Port and DHCP_Options tables, Logi‐ cal_Switch_Port takes precedence. options : domain_name: optional string The DHCPv4 option code for this option is 15. This option speci‐ fies the domain name that client should use when resolving host‐ names via the Domain Name System. options : bootfile_name_alt: optional string "bootfile_name_alt" option is used to support iPXE. When both "bootfile_name" and "bootfile_name_alt" are provided by the CMS, "bootfile_name" will be used for option 67 if the dhcp request contains etherboot option (175), otherwise "bootfile_name_alt" will be used. options : broadcast_address: optional string The DHCPv4 option code for this option is 28. This option speci‐ fies the IP address used as a broadcast address. DHCP Options of type host_id: These options accept either an IPv4 address or a string value. options : tftp_server: optional string The DHCPv4 option code for this option is 66. DHCP Options of type domains: These options accept string value which is a comma separated list of domain names. The domain names are encoded based on RFC 1035. options : domain_search_list: optional string The DHCPv4 option code for this option is 119. DHCPv6 options: OVN also implements native DHCPv6 support. The CMS should define the set of DHCPv6 options as key/value pairs. The define DHCPv6 options will be included in the DHCPv6 response to the DHCPv6 Solicit/Re‐ quest/Confirm packet from the logical ports having the IPv6 addresses in the cidr. Mandatory DHCPv6 options: The following options must be defined. options : server_id: optional string The Ethernet address for the DHCP server to use. This is also included in the DHCPv6 reply as option 2, ``Server Identifier’’ to carry a DUID identifying a server between a client and a server. ovn-controller defines DUID based on Link-layer Address [DUID-LL]. IPv6 DHCPv6 options: Below are the supported DHCPv6 options whose values are an IPv6 ad‐ dress, e.g. aef0::4. Some options accept multiple IPv6 addresses en‐ closed within curly braces, e.g. {aef0::4, aef0::5}. Please refer to RFC 3315 for more details on DHCPv6 options and their codes. options : dns_server: optional string The DHCPv6 option code for this option is 23. This option speci‐ fies the DNS servers that the VM should use. String DHCPv6 options: These options accept string values. options : domain_search: optional string The DHCPv6 option code for this option is 24. This option speci‐ fies the domain search list the client should use to resolve hostnames with DNS. Example: "ovn.org". options : dhcpv6_stateless: optional string This option specifies the OVN native DHCPv6 will work in state‐ less mode, which means OVN native DHCPv6 will not offer IPv6 ad‐ dresses for VM/VIF ports, but only reply other configurations, such as DNS and domain search list. When setting this option with string value "true", VM/VIF will configure IPv6 addresses by stateless way. Default value for this option is false. options : fqdn: optional string The DHCPv6 option code for this option is 39. If set, indicates the DHCPv6 option "FQDN". Common Columns: external_ids: map of string-string pairs See External IDs at the beginning of this document. Connection TABLE Configuration for a database connection to an Open vSwitch database (OVSDB) client. This table primarily configures the Open vSwitch database server (ovsdb-server). The Open vSwitch database server can initiate and maintain active con‐ nections to remote clients. It can also listen for database connec‐ tions. Summary: Core Features: target string (must be unique within table) Client Failure Detection and Handling: max_backoff optional integer, at least 1,000 inactivity_probe optional integer Status: is_connected boolean status : last_error optional string status : state optional string, one of ACTIVE, BACKOFF, CONNECTING, IDLE, or VOID status : sec_since_connect optional string, containing an integer, at least 0 status : sec_since_disconnect optional string, containing an integer, at least 0 status : locks_held optional string status : locks_waiting optional string status : locks_lost optional string status : n_connections optional string, containing an integer, at least 2 status : bound_port optional string, containing an integer Common Columns: external_ids map of string-string pairs other_config map of string-string pairs Details: Core Features: target: string (must be unique within table) Connection methods for clients. The following connection methods are currently supported: ssl:host[:port] The specified SSL port on the host at the given host, which can either be a DNS name (if built with unbound li‐ brary) or an IP address. A valid SSL configuration must be provided when this form is used, this configuration can be specified via command-line options or the SSL ta‐ ble. If port is not specified, it defaults to 6640. SSL support is an optional feature that is not always built as part of Open vSwitch. tcp:host[:port] The specified TCP port on the host at the given host, which can either be a DNS name (if built with unbound li‐ brary) or an IP address. If host is an IPv6 address, wrap it in square brackets, e.g. tcp:[::1]:6640. If port is not specified, it defaults to 6640. pssl:[port][:host] Listens for SSL connections on the specified TCP port. Specify 0 for port to have the kernel automatically choose an available port. If host, which can either be a DNS name (if built with unbound library) or an IP ad‐ dress, is specified, then connections are restricted to the resolved or specified local IPaddress (either IPv4 or IPv6 address). If host is an IPv6 address, wrap in square brackets, e.g. pssl:6640:[::1]. If host is not specified then it listens only on IPv4 (but not IPv6) addresses. A valid SSL configuration must be provided when this form is used, this can be specified either via command-line options or the SSL table. If port is not specified, it defaults to 6640. SSL support is an optional feature that is not always built as part of Open vSwitch. ptcp:[port][:host] Listens for connections on the specified TCP port. Spec‐ ify 0 for port to have the kernel automatically choose an available port. If host, which can either be a DNS name (if built with unbound library) or an IP address, is specified, then connections are restricted to the re‐ solved or specified local IP address (either IPv4 or IPv6 address). If host is an IPv6 address, wrap it in square brackets, e.g. ptcp:6640:[::1]. If host is not specified then it listens only on IPv4 addresses. If port is not specified, it defaults to 6640. When multiple clients are configured, the target values must be unique. Duplicate target values yield unspecified results. Client Failure Detection and Handling: max_backoff: optional integer, at least 1,000 Maximum number of milliseconds to wait between connection at‐ tempts. Default is implementation-specific. inactivity_probe: optional integer Maximum number of milliseconds of idle time on connection to the client before sending an inactivity probe message. If Open vSwitch does not communicate with the client for the specified number of seconds, it will send a probe. If a response is not received for the same additional amount of time, Open vSwitch assumes the connection has been broken and attempts to recon‐ nect. Default is implementation-specific. A value of 0 disables inactivity probes. Status: Key-value pair of is_connected is always updated. Other key-value pairs in the status columns may be updated depends on the target type. When target specifies a connection method that listens for inbound con‐ nections (e.g. ptcp: or punix:), both n_connections and is_connected may also be updated while the remaining key-value pairs are omitted. On the other hand, when target specifies an outbound connection, all key-value pairs may be updated, except the above-mentioned two key- value pairs associated with inbound connection targets. They are omit‐ ted. is_connected: boolean true if currently connected to this client, false otherwise. status : last_error: optional string A human-readable description of the last error on the connection to the manager; i.e. strerror(errno). This key will exist only if an error has occurred. status : state: optional string, one of ACTIVE, BACKOFF, CONNECTING, IDLE, or VOID The state of the connection to the manager: VOID Connection is disabled. BACKOFF Attempting to reconnect at an increasing period. CONNECTING Attempting to connect. ACTIVE Connected, remote host responsive. IDLE Connection is idle. Waiting for response to keep-alive. These values may change in the future. They are provided only for human consumption. status : sec_since_connect: optional string, containing an integer, at least 0 The amount of time since this client last successfully connected to the database (in seconds). Value is empty if client has never successfully been connected. status : sec_since_disconnect: optional string, containing an integer, at least 0 The amount of time since this client last disconnected from the database (in seconds). Value is empty if client has never dis‐ connected. status : locks_held: optional string Space-separated list of the names of OVSDB locks that the con‐ nection holds. Omitted if the connection does not hold any locks. status : locks_waiting: optional string Space-separated list of the names of OVSDB locks that the con‐ nection is currently waiting to acquire. Omitted if the connec‐ tion is not waiting for any locks. status : locks_lost: optional string Space-separated list of the names of OVSDB locks that the con‐ nection has had stolen by another OVSDB client. Omitted if no locks have been stolen from this connection. status : n_connections: optional string, containing an integer, at least 2 When target specifies a connection method that listens for in‐ bound connections (e.g. ptcp: or pssl:) and more than one con‐ nection is actually active, the value is the number of active connections. Otherwise, this key-value pair is omitted. status : bound_port: optional string, containing an integer When target is ptcp: or pssl:, this is the TCP port on which the OVSDB server is listening. (This is particularly useful when target specifies a port of 0, allowing the kernel to choose any available port.) Common Columns: The overall purpose of these columns is described under Common Columns at the beginning of this document. external_ids: map of string-string pairs other_config: map of string-string pairs DNS TABLE Each row in this table stores the DNS records. The Logical_Switch ta‐ ble’s dns_records references these records. Summary: records map of string-string pairs options : ovn-owned optional string external_ids map of string-string pairs Details: records: map of string-string pairs Key-value pair of DNS records with DNS query name as the key and value as a string of IP address(es) separated by comma or space. For PTR requests, the key-value pair can be Reverse IPv4 ad‐ dress.in-addr.arpa and the value DNS domain name. For IPv6 ad‐ dresses, the key has to be Reverse IPv6 address.ip6.arpa. Example: "vm1.ovn.org" = "10.0.0.4 aef0::4" Example: "4.0.0.10.in-addr.arpa" = "vm1.ovn.org" options : ovn-owned: optional string If set to true, then the OVN will be the main responsible for DNS Records within this row. A DNS row with this option set to true can be created for do‐ mains that the user needs to configure locally and don’t care about IPv6 only interested in IPv4 or vice versa. This will let ovn send IPv4 DNS reply and reject/ignore IPv6 queries to save the waiting for a timeout on those uninteresting queries. external_ids: map of string-string pairs See External IDs at the beginning of this document. SSL TABLE SSL configuration for ovn-nb database access. Summary: private_key string certificate string ca_cert string bootstrap_ca_cert boolean ssl_protocols string ssl_ciphers string Common Columns: external_ids map of string-string pairs Details: private_key: string Name of a PEM file containing the private key used as the switch’s identity for SSL connections to the controller. certificate: string Name of a PEM file containing a certificate, signed by the cer‐ tificate authority (CA) used by the controller and manager, that certifies the switch’s private key, identifying a trustworthy switch. ca_cert: string Name of a PEM file containing the CA certificate used to verify that the switch is connected to a trustworthy controller. bootstrap_ca_cert: boolean If set to true, then Open vSwitch will attempt to obtain the CA certificate from the controller on its first SSL connection and save it to the named PEM file. If it is successful, it will im‐ mediately drop the connection and reconnect, and from then on all SSL connections must be authenticated by a certificate signed by the CA certificate thus obtained. This option exposes the SSL connection to a man-in-the-middle attack obtaining the initial CA certificate. It may still be useful for bootstrap‐ ping. ssl_protocols: string List of SSL protocols to be enabled for SSL connections. The de‐ fault when this option is omitted is TLSv1,TLSv1.1,TLSv1.2. ssl_ciphers: string List of ciphers (in OpenSSL cipher string format) to be sup‐ ported for SSL connections. The default when this option is omitted is HIGH:!aNULL:!MD5. Common Columns: The overall purpose of these columns is described under Common Columns at the beginning of this document. external_ids: map of string-string pairs Gateway_Chassis TABLE Association of a chassis to a logical router port. The traffic going out through an specific router port will be redirected to a chassis, or a set of them in high availability configurations. Summary: name string (must be unique within table) chassis_name string priority integer, in range 0 to 32,767 options map of string-string pairs Common Columns: external_ids map of string-string pairs Details: name: string (must be unique within table) Name of the Gateway_Chassis. A suggested, but not required naming convention is ${port_name}_${chassis_name}. chassis_name: string Name of the chassis that we want to redirect traffic through for the associated logical router port. The value must match the name column of the Chassis table in the OVN_Southbound database. priority: integer, in range 0 to 32,767 This is the priority of a chassis among all Gateway_Chassis be‐ longing to the same logical router port. options: map of string-string pairs Reserved for future use. Common Columns: external_ids: map of string-string pairs See External IDs at the beginning of this document. HA_Chassis_Group TABLE Table representing a group of chassis which can provide high availabil‐ ity services. Each chassis in the group is represented by the table HA_Chassis. The HA chassis with highest priority will be the master of this group. If the master chassis failover is detected, the HA chassis with the next higher priority takes over the responsibility of provid‐ ing the HA. If a distributed gateway router port references a row in this table, then the master HA chassis in this group provides the gate‐ way functionality. Summary: name string (must be unique within table) ha_chassis set of HA_Chassises Common Columns: external_ids map of string-string pairs Details: name: string (must be unique within table) Name of the HA_Chassis_Group. Name should be unique. ha_chassis: set of HA_Chassises A list of HA chassis which belongs to this group. Common Columns: external_ids: map of string-string pairs See External IDs at the beginning of this document. HA_Chassis TABLE Summary: chassis_name string priority integer, in range 0 to 32,767 Common Columns: external_ids map of string-string pairs Details: chassis_name: string Name of the chassis which is part of the HA chassis group. The value must match the name column of the Chassis table in the OVN_Southbound database. priority: integer, in range 0 to 32,767 Priority of the chassis. Chassis with highest priority will be the master. Common Columns: external_ids: map of string-string pairs See External IDs at the beginning of this document. BFD TABLE Contains BFD parameter for ovn-controller BFD configuration. OVN BFD implementation is used to provide detection of failures in the path be‐ tween adjacent forwarding engines, including the OVN interfaces. OVN BFD provides link status info to OVN northd in order to update logical flows according to the status of BFD endpoints. In the current imple‐ mentation OVN BFD is used to check next-hop status for ECMP routes. Please note BFD table refers to OVN BFD implementation and not to OVS legacy one. Summary: Configuration: logical_port string dst_ip string min_tx optional integer, at least 1 min_rx optional integer detect_mult optional integer, at least 1 options map of string-string pairs external_ids map of string-string pairs Status Reporting: status optional string, one of admin_down, down, init, or up Details: Configuration: ovn-northd reads configuration from these columns. logical_port: string OVN logical port when BFD engine is running. dst_ip: string BFD peer IP address. min_tx: optional integer, at least 1 This is the minimum interval, in milliseconds, that the local system would like to use when transmitting BFD Control packets, less any jitter applied. The value zero is reserved. Default value is 1000 ms. min_rx: optional integer This is the minimum interval, in milliseconds, between received BFD Control packets that this system is capable of supporting, less any jitter applied by the sender. If this value is zero, the transmitting system does not want the remote system to send any periodic BFD Control packets. detect_mult: optional integer, at least 1 Detection time multiplier. The negotiated transmit interval, multiplied by this value, provides the Detection Time for the receiving system in Asynchronous mode. Default value is 5. options: map of string-string pairs Reserved for future use. external_ids: map of string-string pairs See External IDs at the beginning of this document. Status Reporting: ovn-northd writes BFD status into these columns. status: optional string, one of admin_down, down, init, or up BFD port logical states. Possible values are: • admin_down • down • init • up Static_MAC_Binding TABLE Each record represents a Static_MAC_Binding entry for a logical router. Summary: Configuration: logical_port string ip string mac string override_dynamic_mac boolean Details: Configuration: ovn-northd reads configuration from these columns and propagates the value to SBDB. logical_port: string The logical router port for the binding. ip: string The bound IP address. mac: string The Ethernet address to which the IP is bound. override_dynamic_mac: boolean Override dynamically learnt MACs. Chassis_Template_Var TABLE One record per chassis, each containing a map, variables, between tem‐ plate variable names and their value for that specific chassis. A tem‐ plate variable has a name and potentially different values on different hypervisors in the OVN cluster. For example, two rows, R1 = (.chas‐ sis=C1, variables={(N: V1)} and R2 = (.chassis=C2, variables={(N: V2)} will make ovn-controller running on chassis C1 and C2 interpret the to‐ ken N either as V1 (on C1) or as V2 (on C2). Users can refer to tem‐ plate variables from within other logical components, e.g., within ACL, QoS or Logical_Router_Policy matches or from Load_Balancer VIP and backend definitions. If a template variable is referenced on a chassis for which that vari‐ able is not defined then ovn-controller running on that chassis will just interpret it as a raw string literal. Summary: chassis string (must be unique within table) variables map of string-string pairs Common Columns: external_ids map of string-string pairs Details: chassis: string (must be unique within table) The chassis this set of variable values applies to. variables: map of string-string pairs The set of variable values for a given chassis. Common Columns: external_ids: map of string-string pairs See External IDs at the beginning of this document. Open vSwitch 24.03.90 DB Schema 7.3.0 ovn-nb(5)