With RPR, it is normal since the standby Supervisor would not have booted up fully and hence line cards has to be reset. With SSO, the standby Supervisor would have fully booted up and does not have this problem.
SSO with NSF needs 12.2(31)SG. If you are looking at stability, 12.2(25)EWA5 which supports SSO(without NSF) should be good.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...