I've a problem in my network infrastructure. In the backbone area there are a couple of Cisco Catalyst 4510R, the primary and secondary root bridge of the network. The spanning-tree protocol used is Rapid Spanning-tree with a pathcost method short (default) . The distribution switches are stack of 4/6 Linksys SWR224P connected to 4510Rs in a ring topology. These switches used a pathcost method long.
Sometimes the Catalysts freeze and I see
C4K_EBM%-4-HOSTFLAPPING: on the log.
Surely it is a problem of the loop, but I do not know what could depend.
The network works, then for some cause yet to be discovered, the Catalyst
seems to stop.
It can be a mismatch of pathcost that after an event not able to calculate the correct path of spanning-tree?