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?