Two fiber switches with layer 2 errors

luizsergiosantos · ‎05-08-2009

I have 2 switches that are using fiber, but we see on 8 different servers layer 2 errors. I don't think that both switches have the same problem, either different servers showing the problem. All the cables with problem should not be the case. Does someone has any idea what could cause these errors?

Giuseppe Larosa · ‎05-09-2009

Hello Luiz,

what kind of errors are seen on the servers ?

They can complain of some Cisco proprietary protocol like CDP or of Cisco proprietary PVST STP BPDUs (these are sent over 802.1Q trunks) or for example DTP.

So this could be not a real issue.

see the following excellent document about different Cisco and IEEE frames

http://www.cisco.com/en/US/products/hw/switches/ps700/products_white_paper09186a00801b49a4.shtml

Hope to help

Giuseppe