September 18 2008

How can you discover what caused a Cisco 4507 to stop working?

Posted by feed Under Computer Networking 1 Comment » |

whishywashi asked:

All the sudden my switch stop passing traffic. We have to reboot it to have it working for more that twice now.

Relationship on vacation

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Tags: cisco, Cisco 4507, Discover, Reboot, traffic

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One Response to “How can you discover what caused a Cisco 4507 to stop working?”

1. jman466 says:

   September 21, 2008 at 2:18 am

   This is difficult to responsibly answer without much more information – probably requires more information than can be posted here. When we say that it stops forwarding traffic, do we mean traffic cannot leave any port on the switch? Or that two VLAN’s cannot talk? Or that devices within the same VLAN cannot talk, even though frames ingree/egress on ports.

   You best bet, without a doubt, is to open a TAC case ASAP – I hope that you have a support contract for your 4507. I have worked with a LOT of Cisco switches, and items like this are not common, so again, I would start with TAC. That being said, you can also do a little “digging” on your own as well. Check your port counters, during this freezing, do they still increment? In both directions? If you put a sniffer on a PC, and then send pings from a device in the same VLAN, does it receive the echo? Does it send an echo-reply? If that same PC, pings it’s default gateway, what are your results then? If the issue is only between two VLAN’s (intraVLAN traffic is fine) then run that ping test with some debug on the router (of course use caution with this as debugs used in a non-responsible manner can cause many problems).

   Hope this helps.