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xthuijs
Cisco Employee
Cisco Employee

In XR 5.3.0 we will be enabling BGP NSR by default to be on.

Since default changes always catch us by surprise I wanted to give a heads up notification.

NSR helps with the redundancy by sending, for BGP that is, TCP packets via the standby router to synchronize the TCP sequence numbers, so that when there is a control plane or RSP failover, the peer doesnt even realize that the affected router failed over its control plane. Graceful restart (GR), can help here too by providing a grace period on the peer before tearing the session down, allowing the control plane to reestablish the adjacency. NSR in that regard is more powerful since GR requires peer support and GR also results in temporary "headless" routing (during the GR and adj reestablishment).

XR's scale is always tested with NSR. BGP in XR supports 5000 bgp peerings and beyond easily.

xander

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