From: Wollmann, Bruno RQHR (Bruno.Wollmann@rqhealth.ca)
Date: Wed Nov 14 2007 - 14:09:41 ART
I just disabled IGMP SNOOPING and still no response. I sent a ping from
sw1 to 224.1.1.1 and both the r5 and sw1 respond to this but sw1 will
still not respond when the ping is generated from one of my routers.
I have decided to stop using the switches as test hosts for multicast
and will only use the routers.
Thanks for your help
Bruno
-----Original Message-----
From: David Prall [mailto:dcp@dcptech.com]
Sent: November 14, 2007 9:32 AM
To: Wollmann, Bruno RQHR; 'Gregory Gombas'
Cc: 'Cisco certification'
Subject: RE: Multicast on 3550/3560
Most likely IGMP Snooping killing it. Have you tried disabling IGMP
Snooping, or configuring an IGMP Querier to support IGMP Snooping
without an IGMP router.
David
-- http://dcp.dcptech.com> -----Original Message----- > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf > Of Wollmann, Bruno RQHR > Sent: Wednesday, November 14, 2007 9:17 AM > To: Gregory Gombas > Cc: Cisco certification > Subject: RE: Multicast on 3550/3560 > > Correct. IP IGMP JOIN-GROUP <group address> turns the router into a > multicast receiver/host which doesn't require multicast routing > enabled on the router or PIM enabled on the interface. It's just like
> a PC that joins a multicast group. That PC doesn't have to route > multicast packets, it just wants to receive them. > > I can't get the switches to behave the same way. > > Thanks > Bruno > > -----Original Message----- > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf > Of Gregory Gombas > Sent: November 14, 2007 7:49 AM > To: Wollmann, Bruno RQHR > Cc: Cisco certification > Subject: Re: Multicast on 3550/3560 > > 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/sc > > g/ > > swmcast.htm > > > > > ______________________________________________________________________ > > _ Subscription information may be found at: > > http://www.groupstudy.com/list/CCIELab.html > > ______________________________________________________________ > _________ > Subscription information may be found at: > http://www.groupstudy.com/list/CCIELab.html > > ______________________________________________________________ > _________ > Subscription information may be found at: > http://www.groupstudy.com/list/CCIELab.html
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