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

[Tim Stevenson]

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.

You actually can't increase past 15K & still get L2 mcast constraint 
for the additional groups.

Tim

At 10:35 AM 9/8/2006 +0100, Phil Mayers announced:
>I'm getting these messages on our 6500 sup720-3B. I'm aware you can up
>the limits but I want to find what IGMP activity is causing them. The
>problem being that there is NO WAY normal activity on this set of
>networks could be realistically generating:
>
>"...more Layer 2 entries than what allowed (15488)"
>
>What exactly does the count refer to?
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Tim Stevenson, tstevens at cisco.com
Routing & Switching CCIE #5561
Technical Marketing Engineer, Catalyst 6500
Cisco Systems, http://www.cisco.com
IP Phone: 408-526-6759
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