From: Wollmann, Bruno RQHR (Bruno.Wollmann@rqhealth.ca)
Date: Wed Nov 14 2007 - 01:44:05 ART
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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