All things related to multicast

[Tim Stevenson <>]

At 11:31 AM 9/28/2007 -0500, Dale W. Carder observed:

> Has anyone else seen this message from a cat6k (w/ SXF8)?
>
>  %MCAST-SP-6-GC_LIMIT_EXCEEDED: MLD snooping was trying to allocate
> more Layer 2 entries than what allowed (7744)

There is a software imposed limit on MLD snooping entries in the MAC table (
7744 entries), this syslog is telling you that it was exceeded, which 
means traffic for further group macs will be flooded in the vlan.

> This was coming from a switch/router where no ipv6 multicast is routed.

Is not routed, or there is no IPv6 multicast at all? Is MLD snooping 
enabled or disabled on this box? MLD snooping requires a querier, but 
does not require multicast routing.

Tim


> Dale



Tim Stevenson, 

Routing & Switching CCIE #5561
Technical Marketing Engineer, Data Center BU
Cisco Systems, http://www.cisco.com
IP Phone: 408-526-6759
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