Have you got STP loops in the network? We had a similar issue last year where an undetected loop in the network brought everything down. There was so much traffic the 3550's couldn't handle it and reported the error.
We 'worked' around the issue with the customer by reducing the number of VLAN's trunked everywhere. We also upgraded the IOS to 12.1(20)EA6, although I don't think the IOS upgrade was the fix.
[toc:faq]The ProblemOn traditional switches whenever we have a trunk
interface we use the VLAN tag to demultiplex the VLANs. The switch needs
to determine which MAC Address table to look in for a forwarding
decision. To do this we require the switch to do...
[toc:faq]Introduction:Netdr is a tool available on a RSP720, Sup720 or
Sup32 that allows one to capture packets on the RP or SP inband. The
netdr command can be used to capture both Tx and Rx packets in the
software switching path. This is not a substitut...
IntroductionOSPF, being a link-state protocol, allows for every router
in the network to know of every link and OSPF speaker in the entire
network. From this picture each router independently runs the Shortest
Path First (SPF) algorithm to determine the b...