Michael Robson wrote: > anything similar to the following? We have a core of 6500s running sup720s > with native IOS version 12.2(18)SXD4. When a server sources a multicast > stream (we have seen this on 2 of our 6500s so far), captures show that the > stream corrective passes through the cisco WS-C2970G-24TS-E switch towards > the 6500, but as soon as it enters the 6500 (this 6500 can be the server's > gateway or just passing the traffic at layer 2 to another 6500), all ports > that are a member of the same VLAN as the server receive the traffic, almost > as if IGMP snooping is turned off or broken. I have shown that IGMP snooping > is enabled using the slightly convoluted command (as per Cisco docs) "sh ip > igmp int vlan 404 | inc global". The command gives > > "IGMP snooping is globally enabled"
There's a whole bunch of stuff to try. First, what's the group IP? It isn't in 224.0.0.0/24 by any chance? Figure out the multicast L2 MAC then do: sh mac-addr multi vlan X igmp ...which will show the FDB entries for IGMP-created multicast MACs. On the 6500s which are at layer2, you will want to look at: sh ip igmp snooping mrouter vlan X ...to check that the process I described is working. On the 6500s at L3 examine: sh ip igmp group group.ip.add.r sh ip igmp member group.ip.add.r I'd also recommend an upgrade to the latest SXF code if you can. _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
