[c-nsp] igmp snooping inside 802.1q trunks

[Tim Stevenson]

Or sh ip igmp snooping mrouter on IOS.
Tim

At 11:18 AM 1/30/2006, lee.e.rian at census.gov murmered:
>Vladimir Ivashchenko <hazard at francoudi.com> wrote on 01/30/2006 01:50:58
>PM:
>
> > Hi List,
> >
> > I have a problem with multicast on 802.1q trunk ports. We have a network
> > consisting of Catalyst 3560 with multicast source + a number of Catalyst
> > 6500 where receivers are placed. Multicast is flat on a single VLAN (no
> > routers) and IGMP snooping is configured on all the switches.
> >
> > The problem is that 6500 seems to unconditionally forward all multicast
> > traffic to all trunk ports even if there are no receivers there. E.g.
> > "show mac-address-table multicast" does not show any entries for that
> > port, however it still receives all multicast traffic.
> >
> > Any ideas?
>
>The 6500 is going to forward multicast traffic to any routers it learns
>about.
>Does a "show multicast router" on the 6500 list all the trunk ports?
>
>Lee
>
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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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