Learning OpenStack Networking - Third Edition

Summary

Highly available routers can be created and managed using the same router command set discussed in the previous chapter. Neutron L3 agents are responsible for configuring the routers in a VRRP group, and the routers are left to elect a master router and implement their respective keepalived configuration based on their master or backup state at that time.

While HA routers provide a level of redundancy over their standalone counterparts, they are not without their drawbacks. A single node hosting a master router is still a bottleneck for traffic traversing that router. In addition, if the network used for dedicated VRRP traffic between routers experiences a loss of connectivity, the routers can become split-brained. This can cause ...