Greets.
We have a pair of 7206VXRs and a Cat 6509. The routers are connected with
a port-channel (2 x 100Mbit FEs) and again each router is connected to the
6509 with another port-channel (2 x 100Mbit FEs).
We run into a problem looking very much like a broadcast storm that sends
the 6509 into a fit -- it sporadicly forwards traffic during the storm.
It remains in a semifunctional state until it recieves a 'reset 3'.
Module 3 is a 48 port 100Mbit ethernet card and is currently the only
module to which we have devices connected.
The various stats we collect tell us that:
1. There is a multicast storm of several million packets per second
2. This storm appears to loop from Cat to router to router to Cat, etc.
3. The storm persists until I reset the module.
4. This traffic never makes it to my span ports -- The Cat discards
them.
The only suspicious activity which I've been able to match up with each
occurence of this outage is an IGMP multicast from a server on our network
to 224.0.0.2.
So I guess what I'm getting at here.... :) Any similar problems? Is
there something obvious that I'm overlooking which may lead to this kind
of activity? If I have a loop, I'm not seeing it. Anything I should look
for?
Any pointers appreciated. TIA.
This archive was generated by hypermail 2b29 : Sun Aug 04 2002 - 04:12:58 EDT