From: Huan Pham (huan.pham@valuenet.com.au)
Date: Wed Jan 23 2008 - 22:29:47 ARST
Hi GS,
I have the same problem that Bruno posted in Nov/2007. I cannot find any
solution in GS achieve to this problem yet. Hopefully someone can shed some
light to it.
When I configure a SW to join a group as a multicast receiver, and does not
have the SW to take part in the multicast routing, the Switch can not
receives any multicast packet at all. The switch does send an IGMP join
message, the upstream multicast router start forwarding multicast packets to
the switch. I do not see any packets received on the SW.
After 3 minutes or so, router starts queering SW via IGMP but does not get
any response from the SW, so the router delete the interface connecting to
the SW from its OIL list.
It looks like IGMP snooping is the problem, but I can not find any solution
to this problem.
More details are at:
http://www.groupstudy.com/archives/ccielab/200711/threads.html#01079
Any help is appreciated. Thanks in advance!
Bruno,
BTW, did you find any solution yourself back in last Nov?
Huan,
On Nov 13, 2007 11:44 PM, Wollmann, Bruno RQHR
<Bruno.Wollmann@xxxxxxxxxxx> 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
Cheers,
Huan Pham
Network Engineer
p: +61 2 9722 3428
f: +61 2 9722 3410
e: huan.pham@valuenet.com.au
w: www.valuenet.com.au
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