From: Gary Duncanson (gary.duncanson@googlemail.com)
Date: Thu Jan 24 2008 - 13:49:07 ARST
Huam,
There are a number of *things* regarding getting stuff working between the
different switches. Sorry to be so vague but the details escape me at
present. One of the hassles is ospf and mtu I believe. This may not be the
solution to your problem but it's probably worth chacking archives for
anything 3550-3560 compatibility related.
I may look into it for you later.
HTH
Gary
----- Original Message -----
From: "Huan Pham" <huan.pham@valuenet.com.au>
To: <bruno.wollmann@rqhealth.ca>; <ccielab@groupstudy.com>
Sent: Thursday, January 24, 2008 12:29 AM
Subject: Re: Multicast on 3550/3560
> 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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