The Networking (neutron) service L3 agent is scalable, due to the scheduler that supports Virtual Router Redundancy Protocol (VRRP) to distribute virtual routers across multiple nodes. For more information about the VRRP and keepalived, see Linux bridge: High availability using VRRP and Open vSwitch: High availability using VRRP.
To enable high availability for configured routers, edit the
/etc/neutron/neutron.conf file to set the following values:
|l3_ha||True||All routers are highly available by default.|
|allow_automatic_l3agent_failover||True||Set automatic L3 agent failover for routers|
|max_l3_agents_per_router||2 or more||Maximum number of network nodes to use for the HA router.|
|min_l3_agents_per_router||2 or more||Minimum number of network nodes to use for the HA router. A new router can be created only if this number of network nodes are available.|