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          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
                 Logical_Switch
                           L2 logical switch
                 Logical_Switch_Port
                           L2 logical switch port
                 Address_Set
                           Address Sets
                 Port_Group
                           Port Groups
                 Load_Balancer
                           load balancer
                 ACL       Access Control List (ACL) rule
                 Logical_Router
                           L3 logical router
                 QoS       QoS rule
                 Meter     Meter entry
                 Meter_Band
                           Band for meter entries
                 Logical_Router_Port
                           L3 logical router port
                 Logical_Router_Static_Route
                           Logical router static routes
                 NAT       NAT rules
                 DHCP_Options
                           DHCP options
                 Connection
                           OVSDB client connections.
                 DNS       Native DNS resolution
                 SSL       SSL configuration.
                 Gateway_Chassis
                           Gateway_Chassis configuration.
          
          NB_Global TABLE
                 Northbound  configuration  for  an OVN system. This table must have ex‐
                 actly one row.
          
             Summary:
                 Status:
                   nb_cfg                      integer
                   sb_cfg                      integer
                   hv_cfg                      integer
                 Common Columns:
                   external_ids                map of string-string pairs
                 Common options:
                   options                     map of string-string pairs
                   Options for configuring 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 : mac_prefix        optional string
                 Connection Options:
                   connections                 set of Connections
                   ssl                         optional SSL
                 Security Configurations:
                   ipsec                       boolean
          
             Details:
               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.
          
                 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.
          
                 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 table in the southbound database.  Thus,  hv_cfg  equals
                        nb_cfg if all chassis are caught up with the northbound configu‐
                        ration (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.
          
               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 BFD:
          
                 These  options  apply when ovn-controller configures BFD on tunnels in‐
                 terfaces.
          
                 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 : mac_prefix: optional string
                        Configure a given OUI to be used as prefix when  L2  address  is
                        dynamically assigned, e.g. 00:11:22
          
               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.
          
          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 a physical network (bridged logical switches).
                 They work in the same way when providing connectivity  between  logical
                 ports  on  same  chasis, 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 segment
                 with  the  help  of localnet ports. Each bridged logical switch has one
                 and only one localnet port, which has only one special address unknown.
          
             Summary:
                 ports                         set of Logical_Switch_Ports
                 load_balancer                 set of Load_Balancers
                 acls                          set of ACLs
                 qos_rules                     set of QoSs
                 dns_records                   set of weak reference to DNSs
                 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
                 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 Load_Balancers
                        Load  balance a virtual ip address to a set of logical port end‐
                        point ip addresses.
          
                 acls: set of ACLs
                        Access control rules that apply to packets  within  the  logical
                        switch.
          
                 qos_rules: set of QoSs
                        QoS  marking and metering rules that apply to packets within the
                        logical switch.
          
                 dns_records: set of weak reference to DNSs
                        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.
          
               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
          
               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 for localnet ports:
                      options : network_name   optional string
                   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 : qos_max_rate   optional string
                      options : qos_burst      optional string
                 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
                 Naming:
                   external_ids : neutron:port_name
                                               optional string
                 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.
          
                 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.
          
                        localnet
                               A  connection  to  a locally accessible network from each
                               ovn-controller instance. A logical switch can only have a
                               single  localnet port attached. This is used to model di‐
                               rect connectivity to an existing network.
          
                        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.
          
               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 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.
          
               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.
          
                 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.
          
               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.
          
                 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. This allows the
                        CMS to wait for a VM’s (or container’s) networking to become ac‐
                        tive before 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 pro‐
                               cesses a unicast Ethernet frame whose destination MAC ad‐
                               dress  is  not in any logical port’s addresses column, it
                               delivers it to the port (or ports) whose  addresses  col‐
                               umns include unknown.
          
                        dynamic
                               Use  this  keyword to make ovn-northd generate a globally
                               unique MAC address and choose an unused IPv4 address with
                               the  logical  port’s  subnet and store them in the port’s
                               dynamic_addresses column. ovn-northd will use the  subnet
                               specified  in  other_config:subnet  in  the  port’s Logi
                               cal_Switch.
          
                        Ethernet address followed by keyword "dynamic"
                               The keyword dynamic after the MAC address indicates  that
                               ovn-northd  should choose an unused IPv4 address from the
                               logical port’s subnet and store it with the specified MAC
                               in  the  port’s dynamic_addresses column. ovn-northd will
                               use the subnet specified in  other_config:subnet  in  the
                               port’s Logical_Switch table.
          
                               Examples:
          
                               80:fa:5b:06:72:b7 dynamic
                                      This  indicates  that  the  logical  port owns the
                                      specified MAC address and ovn-northd should  allo‐
                                      cate  an  unused IPv4 address for the logical port
                                      from the corresponding logical switch subnet.
          
                        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 redirect-chas
                               sis 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.
          
               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.)
          
               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.
          
          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, either tcp or udp
                 Common Columns:
                   external_ids                map of string-string pairs
          
             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, either tcp or udp
                        Valid protocols are tcp or udp. This column  is  useful  when  a
                        port number is provided as part of the vips column. If this col‐
                        umn is empty and a port number is provided as part of vips  col‐
                        umn, OVN assumes the protocol to be tcp.
          
               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:
                 priority                      integer, in range 0 to 32,767
                 direction                     string, either from-lport or to-lport
                 match                         string
                 action                        string,  one  of  allow-related,   allow,
                                               drop, or reject
                 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:
                   external_ids                map of string-string pairs
          
             Details:
                 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.
          
                 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, drop, or reject
                        The action to take when the ACL rule matches:
          
                        ?      allow: Forward the packet.
          
                        ?      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.
          
               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.
          
               Common Columns:
          
                 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
                 enabled                       optional boolean
                 nat                           set of NATs
                 load_balancer                 set of Load_Balancers
                 Naming:
                   name                        string
                   external_ids : neutron:router_name
                                               optional string
                 Options:
                   options : chassis           optional string
                   options : dnat_force_snat_ip
                                               optional string
                   options : lb_force_snat_ip  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.
          
                 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  logical
                        router port with a redirect-chassis specified.
          
                 load_balancer: set of Load_Balancers
                        Load  balance  a  virtual ip address to a set of logical port ip
                        addresses. Load balancer rules only work on the Gateway routers.
          
               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.
          
               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 the IP address to use to force SNAT a packet
                        that has already been DNATed in the gateway router. When  multi‐
                        ple gateway routers are configured, a packet can potentially en‐
                        ter any of the gateway router, get DNATted 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
                        option with a gateway specific IP address.
          
                 options : lb_force_snat_ip: optional string
                        If set, indicates the IP address 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  poten‐
                        tially  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 option with a
                        gateway specific IP address.
          
               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 bandwdith  col‐
                 umn is specified, then matching packets will have metering applied. ac
                 tion and bandwdith 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 must  be
                                               dscp, value in range 0 to 63
                 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 must be dscp, value in range 0
                 to 63
                        When specified, matching flows will have DSCP marking applied.
          
                        ?      dscp: The value of this action should be in the range  of
                               0 to 63 (inclusive).
          
                 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.
          
          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
                 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.
          
                 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)
                 gateway_chassis               set of Gateway_Chassiss
                 networks                      set of 1 or more strings
                 mac                           string
                 enabled                       optional boolean
                 ipv6_ra_configs:
                   ipv6_ra_configs : address_mode
                                               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
                 Options:
                   options : redirect-chassis  optional string
                   options : reside-on-redirect-chassis
                                               optional string
                 Attachment:
                   peer                        optional string
                 Common Columns:
                   external_ids                map of string-string pairs
          
             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.
          
                 gateway_chassis: set of Gateway_Chassiss
                        If set, this indicates that this logical router port  represents
                        a  distributed gateway port that connects this router to a logi‐
                        cal switch with a localnet port. There may be at most  one  such
                        logical router port on each logical router.
          
                        Several  Gateway_Chassis  can  be referenced for a given logical
                        router port. A single Gateway_Chassis is functionally equivalent
                        to setting options:redirect-chassis. Refer to the description of
                        options:redirect-chassis for additional details on gateway  han‐
                        dling.
          
                        Defining  more than one Gateway_Chassis will enable gateway high
                        availability. Only one gateway will be active  at  a  time.  OVN
                        chassis  will  use  BFD to monitor connectivity to a gateway. If
                        connectivity to the active gateway is interrupted, another gate‐
                        way  will become active. The priority column specifies the order
                        that gateways will be chosen by OVN.
          
                 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.
          
               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 : 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.
          
               Options:
          
                 Additional options for the logical router port.
          
                 options : redirect-chassis: optional string
                        If  set, this indicates that this logical router port represents
                        a distributed gateway port that connects this router to a  logi‐
                        cal  switch  with a localnet port. There may be at most one such
                        logical router port on each logical router.
          
                        Even when a redirect-chassis is specified,  the  logical  router
                        port  still effectively resides on each chassis. However, due to
                        the implications of the use of L2 learning in the physical  net‐
                        work,  as  well as the need to support 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
                        specified redirect-chassis.
          
                        When this option is specified, the peer  logical  switch  port’s
                        addresses  must  be set to router. With this setting, the exter
                        nal_macs specified in NAT rules are automatically programmed  in
                        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  redirect-chas
                        sis.
          
                        When this option is specified and it is desired to generate gra‐
                        tuitous ARPs for NAT addresses, then  the  peer  logical  switch
                        port’s options:nat-addresses should be set to router.
          
                        While  options:redirect-chassis is still supported for backwards
                        compatibility, it is now preferred to specify one or more  gate
                        way_chassis  instead.  It is functionally equivalent, but allows
                        you to specify multiple chassis to enable high availability.
          
                 options : reside-on-redirect-chassis: optional string
                        Generally routing is distributed in OVN. The packet from a logi‐
                        cal  port  which  needs to be routed hits the router pipeline in
                        the source chassis. For the East-West  traffic,  the  packet  is
                        sent  directly to the destination chassis. For the outside traf‐
                        fic the packet is sent to the gateway chassis.
          
                        When this option is set, OVN considers this only if
          
                        ?      The logical router to which this logical router port  be‐
                               longs to has a distributed gateway port.
          
                        ?      The peer’s logical switch has a localnet port (represent‐
                               ing a VLAN tagged network)
          
                        When this option is set to true, then the packet which needs  to
                        be  routed  hits  the router pipeline in the chassis hosting the
                        distributed gateway router port. The source chassis  pushes  out
                        this  traffic  via  the  localnet  port. With this the East-West
                        traffic is no more distributed and will always  go  through  the
                        gateway chassis.
          
                        Without  this  option  set,  for any traffic destined to outside
                        from a logical port which belongs to a logical switch  with  lo‐
                        calnet  port,  the  source  chassis will send the traffic to the
                        gateway chassis via the tunnel port instead of the localnet port
                        and this could cause MTU issues.
          
               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.
          
          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.
          
             Summary:
                 ip_prefix                     string
                 policy                        optional string, either dst-ip or src-ip
                 nexthop                       string
                 output_port                   optional string
                 Common Columns:
                   external_ids                map of string-string pairs
          
             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.
          
                 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.
          
               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
                 logical_ip                    string
                 logical_port                  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 redirect-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.
          
                 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 redi
                        rect-chassis.
          
               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 : tftp_server    optional string
                      options : classless_static_route
                                               optional string
                      options : ms_classless_static_route
                                               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
                   String DHCP Options:
                      options : wpad           optional string
                      options : bootfile_name  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
                 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 : tftp_server: optional string
                        The DHCPv4 option code for this option is 66.
          
                 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.
          
               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.
          
               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.
          
               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.
          
               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
                 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.
          
                        Example:  "vm1.ovn.org" = "10.0.0.4 aef0::4"
          
                 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 one or more chassis to a logical router port. The traf‐
                 fic going out through an specific router port will be redirected  to  a
                 chassis, or a set of them in high availability configurations. A single
                 Gateway_Chassis is equivalent to setting options:redirect-chassis.  Us‐
                 ing  Gateway_Chassis  allows  associating  multiple prioritized chassis
                 with a single logical router port.
          
             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.
          
          
          
          Open vSwitch 2.11.90            DB Schema 5.14.0                     ovn-nb(5)
          
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