[c-nsp] Catalyst 2950 freezing

Henry-Nicolas Tourneur hntourneur at autempspourmoi.be
Mon Dec 19 05:40:50 EST 2011

Hi all,


For one of our customer, we'v a Cisco Catalyst 2950 located in their
premises, through this switch we deliver an internet access as well as a
voice service.

The switch has a really basic cfg: 3 ports connected, 1 trunk and 1 port per


>From time to time, the switch freezes completely (all services down, switch

Obviously, we already swapped the switch several times, check the logs,
errors counters . and nothing solved our issue.


Even more weird, this morning we saw a traffic spike at 50mbps (services are
4mbps and 1mbps) on every ports while they are inside separated VLAN (so
even an L2 loop shouldn't do this).


We suspect a physical issue in the customer environment but we got no
evidence of this.


So, I would like to get opinions on how to troubleshoot this. 

I don't know if there is any chassis debugging on a Catalyst switch (power
issues) or any experience someone could share?


Thanks for your help J


Henry-Nicolas Tourneur.

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