[c-nsp] IGMP on 6500s - %MCAST-xx-GC_LIMIT_EXCEEDED

[Dale W. Carder]

On Sep 11, 2006, at 2:03 PM, Phil Mayers wrote:
> Thanks, but correct me if I'm wrong that's IGMP joins and activity  
> at layer3 interfaces rather than IGMP snooping?

I believe that Cisco's igmp snooping implementation requires
that there be an igmp capable router (or igmp querier) on the
vlan in order to set up the snooping entry, so you should see
igmp joins /somewhere/ right?  ;-)  Hopefully you could at least
get it narrowed down to a vlan.

Otherwise, how are you doing on mac addresses period?  Could
there be malicious hosts on your network running dsniff or
macof that might be trying to flood the cam tables?  Could
there be hosts trying to probe multicast ip space?  Got a
sniffer?

Dale

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Dale W. Carder - Network Engineer
University of Wisconsin at Madison
http://net.doit.wisc.edu/~dwcarder