OpenStack Networking (Neutron)
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Open Virtual Network (OVN) offers the following virtual network services:

  • Layer-2 (switching)

    Native implementation. Replaces the conventional Open vSwitch (OVS) agent.

  • Layer-3 (routing)

    Native implementation that supports distributed routing. Replaces the conventional Neutron L3 agent. This includes transparent L3HA :doc::routing support, based on BFD monitorization integrated in core OVN.

  • DHCP

    Native distributed implementation. Replaces the conventional Neutron DHCP agent. Note that the native implementation does not yet support DNS features.

  • DPDK

    OVN and ovn mechanism driver may be used with OVS using either the Linux kernel datapath or the DPDK datapath.

  • Trunk driver

    Uses OVN's functionality of parent port and port tagging to support trunk service plugin. One has to enable the 'trunk' service plugin in neutron configuration files to use this feature.

  • VLAN tenant networks

    The ovn driver does support VLAN tenant networks when used with OVN version 2.11 (or higher).

  • DNS

    Native implementation. Since the version 2.8 OVN contains a built-in DNS implementation.

The following Neutron API extensions are supported with OVN:

Extension Name Extension Alias
Allowed Address Pairs allowed-address-pairs
Auto Allocated Topology Services auto-allocated-topology
Availability Zone availability_zone
Default Subnetpools default-subnetpools
Multi Provider Network multi-provider
Network IP Availability network-ip-availability
Neutron external network external-net
Neutron Extra DHCP opts extra_dhcp_opt
Neutron Extra Route extraroute
Neutron L3 external gateway ext-gw-mode
Neutron L3 Router router
Network MTU net-mtu
Port Binding binding
Port Security port-security
Provider Network provider
Quality of Service qos
Quota management support quotas
RBAC Policies rbac-policies
Resource revision numbers standard-attr-revisions
security-group security-group
standard-attr-description standard-attr-description
Subnet Allocation subnet_allocation
Tag support standard-attr-tag
Time Stamp Fields standard-attr-timestamp
Domain Name System (DNS) dns_integration