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

[Phil Mayers]

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.
> 
> Although the message refers to IGMP, is it possible that MLD is 
> implicated? "sh mac- mul mld" gives several 3333.0000.00xx groups per 
> vlan (even though no IPv6 address is defined on those vlans) and then 
> weirdly lists all active output interfaces for the 3333.0000.000d group 
> for each vlan, not just the interfaces that vlan is on.
> 
> Summing up the interfaces times vlans times groups I get ~9k, which is 
> getting in the right region for the 15k I'm seeing reported. But if so, 
> it does rather imply that MLD snooping is very broken.
> 
> I can't come up with any other combination of multicast 
> groups/sources/interfaces that gets even close to being what the error 
> indicates.

For what it's worth, disabling mld snooping did not help. I'm going to 
open a TAC case, thanks for the comments all.