Can anyone explain me the below problem:
We have four switches (2xC6506-Sup1a and 2xC4506-sup4) in square with rapid spanning tree. On link is blocked like expected. The unexpected is that the BPDU-guard now put this interfaces in err disabled state. Currently we disable the BPDU guard on these ports, so it works normally.
But we have other C4506-Sup2p in a triangle behind the both C6506, there works the blocked link with BPDU guard.
Until now I didn?t found a explanation. Has any one already make similar experience?