Stateful failover

A stateful failover is a high availability mechanism that

  • continuously passes per-connection state information from the active unit to the standby unit

  • maintains connection information after a failover occurs, and

  • allows supported end-user applications to continue communication sessions without reconnecting.

Stateful failover operation

During Stateful Failover, the active unit continually passes per-connection state information to the standby unit. After a failover occurs, the same connection information is available at the new active unit. Supported end-user applications are not required to reconnect to keep the same communication session.