Installing and configuring additional L3 agents

To configure HA routers, two or more L3 agents are required. The L3 agent was installed on the controller01 node in the previous chapter. On all remaining compute nodes, run the following command to install the L3 agent:

# apt install neutron-l3-agent 

Defining an interface driver

Both the Linux bridge and Open vSwitch mechanism drivers support HA routers, and the Neutron L3 agent must be configured to use the interface driver that corresponds to the chosen mechanism driver.

Update the Neutron L3 configuration file on the compute nodes at /etc/neutron/l3_agent.ini and specify one of the following interface drivers:

On compute01 running the Linux bridge agent:

[DEFAULT]
...
interface_driver = linuxbridge 

On compute02 and running the Open vSwitch agent:

[DEFAULT]
...
interface_driver = openvswitch 

Setting the agent mode

The Neutron L3 agent considers HA routers as legacy routers, as many of the same mechanisms used for standalone routers are shared with...