Cisco 7600 is connected with routed port on OSM module to a switch. Network behind the switch experiences L2 loop and STP goes crazy. This kills CPU on Cisco 7600. I would like to know is there a mechanism to prevent this behavior. How does Cisco 7600 treat STP BPDU that comes in on a routed port?
Well, I didn't have access to the box at the time of problem. All I could see was output from #sh proc cpu history and the fact that all routing protocol adjacencies were broken at that time. I'm not 100% sure what happened but I know that there was stp loop on that side. I wouldn't count that there were a lot of broadcast frames because there is only one other host on this Vlan.
[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...