All things related to multicast

["Dale W. Carder" <>]

Hey Tim,

On Sep 28, 2007, at 12:23 PM, Tim Stevenson wrote:
> 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.

That's what I thought.

> > 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.

No IPv6 at all on this box (and that side of campus.
Any host running v6 would only have a link-local address.)
We're just running the defaults there w.r.t. v6.  However,
I believe that by default mld snooping is on.

One of my NOC guys is on the horn w/ TAC, and I think they
were thinking bug.  I'll see what they find out.

Dale