Recovery and Failback
For a seamless failover and failback, the UE sessions and the corresponding service IP addresses are grouped together.
The following scenarios describe the seamless failover and failback mechanism for the UE sessions:
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Normal - The UE sessions set is created, updated, or deleted from first rack and replicated to second rack.
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Failure - The UE sessions set is created, updated, or deleted from second rack and is not replicated to first rack due to its unavailability.
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Recovery - The CDL for first rack performs an auto-sync with the CDL for second rack to recover all the UE session data. During the recovery, the second rack continues to handle traffic from the sessions set.