You can initiate a redundancy group x failover manually. A manual failover applies until a failback event occurs.
For example, suppose that the user manually does a redundancy group 1 failover from node 0 to node 1. Then an interface that redundancy group 1 is monitoring fails, dropping the threshold value of the new primary redundancy group to zero. This event is considered a failback event, and the system returns control to the original redundancy group.
You can also initiate a redundancy group 0 failover manually if you want to change the primary node for redundancy group 0. You cannot enable preemption for redundancy group 0.
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Caution: Be cautious and judicious in your use of redundancy group 0 manual failovers. A redundancy group 0 failover implies a Routing Engine failover, in which case all processes running on the primary node are killed and then spawned on the new primary Routing Engine. This failover could result in loss of state, such as routing state, and degrade performance by introducing system churn. |