We have experienced the following issue a couple of times.
Access layer switch - 6506, dual Sup32 running high availability. Has uplinks to distribution switch A from ports 5/1 and 6/1 and to dist switch B from ports 5/2 and 6/2. Uplinks are routed and are LACP Etherchannels. We run EIGRP with NSF and we also run UDLD aggressive mode.
We have noticed when we have a supervisor failure and subsequent failover on the access switch that all distribution ports connected to the access switch gets disabled with a UDLD aggressive mode error. Even from the supervisor that is not failing? Thus we are left with an isolated access switch even though it is still operational.
Has anyone else seen this. Considering turning off aggressive mode to see if this stops this problem.
Any help would be appreciated.