OPERATIONAL DEFECT DATABASE
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After BGP Graceful Restart, convergence time is longer than it could be.
During BGP Graceful Restart the ASR9K, acting as receiving speaker, sends a TCP RST for the new TCP connection to the restarting speaker when the new BGP session is re-established after the Graceful Restart. Subsequently, it establishes a new connection to continue the GR.
1. Disable BGP session dampening on the restarting speaker. 2. lengthen the graceful restart timers on the receiving speaker.
The reason that this behavior has become an issue is that the restarting speaker is dampening BGP sessions. The received RST is triggering the dampening. This causes it to reject the next session opened by the receiving speaker. It does eventually allow sessions again, but not before the GR timers expire. BGP session dampening should dampen only outgoing connections, not incoming connections.
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