I am planning to implement nonstop software upgrade (NSSU) on a virtual chassis and I see graceful switchover (GRES), nonstop active routing (NSR) and nonstop bridging (NSB) must be enabled. THese seem like they should be a no brainer for configuring a virtual chassis to begin with.
I am curious if there are any downsides (performance,etc.) to enabling NSR, NSB and GRES? Are there any reasons that I wouldnt want to enable these to not only take advantage of NSSU, but to also for better HA on the VC?
Which platform you're planning for NSSU?
Yes, even if you never plan on using NSSU enabling these protocols is a good practice for the operational stability on the VC during hardware failures.