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Failover-Failback Procedure Failover: Attempt to re-route pending request to an alternate peer in case of transport failure ‘T’ bit is set for re-routed requests Failback: Switch back to the original next hop when connection is re-established Client Relay1 Relay2 Server 1. Request 4. Answer 2. Request T-bit set 3. Request T-bit set 4. Answer 5. Answer 2. Request 3. Answer Request Queue Request Queue Request Queue |