Features

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