On 10/12/10, Gert Doering <[email protected]> wrote: > Hi, > > On Mon, Oct 11, 2010 at 04:35:24PM -0400, Matthew Huff wrote: >> If the switch doesn't provide layer 3 services (routing) itself, but is >> really a l2 switch, then you don't need multicast routing / pim, >> etc...However, you should have igmp snooping on. > > IGMP snooping won't help for router-switch-router traffic. > > "No IGMP there"
I thought the problem on router-switch-router multicast traffic was that IGMP snooping didn't limit multicast traffic. I've never connected up routers through a 2950 (which is what the OP is using - right?), but it looks like igmp snooping on a 2950 does learn the ports going to PIM routers: c2950>sh ip igmp snoop [.. snip ..] Vlan 1: -------- IGMP snooping : Enabled Immediate leave : Disabled Multicast router learning mode : pim-dvmrp Source only learning age timer : 10 Last member query interval : 1000 CGMP interoperability mode : IGMP_ONLY Lee _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
