[c-nsp] IGMP on 6500s - %MCAST-xx-GC_LIMIT_EXCEEDED
Dale W. Carder
dwcarder at doit.wisc.edu
Mon Sep 11 13:48:25 EDT 2006
On Sep 11, 2006, at 11:16 AM, Phil Mayers wrote:
> Tim Stevenson wrote:
>> It refers to Layer 2 group MAC entries (try sh mac- mul ig or sh
>> multicast group); these are driven by IGMP join activity in host
>> VLANs.
> What else can I do
...
> to try and diagnose the source?
> Debug of IGMP join activity is unlikely to be do-able on this router.
You can monitor igmp activity via SNMP.
John Kristoff wrote a nice tool called mcastsum[*] to do basic polling
of multicast related counters to aid troubleshooting.
You can download mcastsum w/ my patch to prettify the output at:
http://net.doit.wisc.edu/~dwcarder/scripts/
Dale
----------------------------------
Dale W. Carder - Network Engineer
University of Wisconsin at Madison
http://net.doit.wisc.edu/~dwcarder
[*] The original can be found at http://aharp.ittns.northwestern.edu/
software/
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