From: Gregory Gombas (ggombas@gmail.com)
Date: Wed Nov 14 2007 - 10:48:46 ART
I thought routers also needed PIM enabled in order to enable multicast
processing on the interface. Are you saying that is not the case? Is
that documented somewhere?
Thanks,
Greg
On Nov 13, 2007 11:44 PM, Wollmann, Bruno RQHR
<Bruno.Wollmann@rqhealth.ca> wrote:
> Hello GS,
>
> Has anyone other than me had trouble getting a 3550 or 3560 to reply to
> pings after using the IP IGMP JOIN-GROUP command? My switches won't
> reply to pings unless I enable multicast routing on them and enable PIM
> on the interface. My routers only need to join the group to reply to
> pings. I don't have to enable multicast routing or PIM.
>
> My setup is simple. OSPF is running on all 4 devices so that r1 knows
> about the r3,r5,sw1 network and sw1 and r5 know about the r1,r3 network.
> I started off with more complicated configs as I was doing practice labs
> and was having problems getting them to work. To help troubleshoot, I
> simplified things. r1 and r3 are running PIM DENSE on their interfaces.
> Even when I send a ping from r3, r5 is the only device to reply, sw1
> does not.
>
> r1----p2pserial----r3-------sw1
> |-----r5
>
> Is this normal behaviour for the switches. I've read the doc cd and I
> think my setup should work without having to enable multicast routing on
> the switches. I've tried this with routed interfaces and svi interfaces
> on the switches. What am I missing?
>
> http://www.cisco.com/univercd/cc/td/doc/product/lan/cat3560/12240se/scg/
> swmcast.htm
>
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