Should NSR and NSF be configured together?

[Seth Beauchamp]

Is there any benefit in configuring both NSR and NSF on the routing protocols that support it? I understand that NSR can work independently to keep routing adjacencies up without the neighbors assistance, while NSF both routers need to have it enabled.

In a scenario with an ASR9k (dual RP) and ASR1k connected, is there any benefit to running NSR and NSF on the ASR9k and NSF on the ASR1k?

What about two ASR9ks (dual RP) connected to each other? Any benefit in running NSF and NSR both?

[tkarnani · Accepted solution]

NSR is inside the router..between RSPs it will help if there is an RSP crash

NSF is between Peers.

NSR is a great idea to have on the ASR9k side, most of the time it is enabled by default for a few protocols.

NSF on the other hand is your choice, if the peer is down do you still want to maintain the forwarding state? or do you want to force convergence