To ensure the highest level of uptime for a site, even through Avi Load Balancer software upgrades, careful consideration must be made to ensure availability for both Avi Load Balancer Controller's and Service Engines. This topic introduces Controller High Availability and Service Engine High Availability.

  • Avi Load Balancer Controller HA: Provides node-level redundancy for Avi Load Balancer Controller's. A single Avi Load Balancer Controller is deployed as the leader node while the two additional Avi Load Balancer Controller's are added as follower nodes.

  • Avi Load Balancer Service Engine HA: Provides SE-level redundancy within a SE group. If a SE within the group fails then, the HA heals the failure and compensates for the reduced site capacity; which means it replaces a new SE in place of the one that has failed.

HA for Avi Load Balancer Controller's and SEs are separate features which are configured separately. HA for Avi Load Balancer Controller's is a system administration setting.

Note:

To ensure application availability in the presence of whole site failures, Avi Load Balancer recommends use of Avi Load Balancer GSLB which provides an overview See the Avi Load Balancer Controller GSLB Guide for more information.