I think you guys are all over thinking this one. If it's really INTRA VLAN multicast as described in the OP (and not INTER as the subject suggests) then all this IGMP and multicast routing talk is moot. If the original question is does multicast flow over a trunk by default, then the answer is most certainly "yes". If it wasn't then we wouldn't be able to bring up an OSPF or EIGRP adjacency in a good number of IPexpert labs. All of the routers are interconnectged via switches, and a lot are using subinterfaces.
I like that SFP thing though. That's a weird one I'll have to remember for the future. Jason On Thu, Mar 1, 2012 at 4:15 PM, Ben Hughes <[email protected]> wrote: > So long as there is a router or some device with IGMP and PIM running > connected to the VLAN you wouldn't need to have multicast-routing enabled > on the switch. > > cheers, > Ben. > > From: Jay McMickle <[email protected]<mailto:[email protected]>> > Date: Thu, 1 Mar 2012 15:01:46 -0800 > To: Ben Hughes <[email protected]<mailto:[email protected]>> > Cc: marc abel <[email protected]<mailto:[email protected]>>, " > [email protected]<mailto:[email protected]>" < > [email protected]<mailto:[email protected]>> > Subject: Re: [OSL | CCIE_RS] Intervlan multicast across switces > > Right, but even with sparse-mode multicast? This isn't standard multicast, > but maybe I'm making it a larger issue than it is. > > Regards, > Jay McMickle- CCNP,CCSP,CCDP > Sent from iJay > > On Mar 1, 2012, at 2:58 PM, Ben Hughes <[email protected]<mailto: > [email protected]>> wrote: > > Hi Jay, > Yes, it will work fine without multicast-routing turned on. Otherwise > we'd have to turn on multicast-routing when ever we run an IGP or HSRP etc. > cheers, > Ben. > From: Jay McMickle <[email protected]<mailto:[email protected] > ><mailto:[email protected]>> > Reply-To: Jay McMickle <[email protected]<mailto: > [email protected]><mailto:[email protected]>> > Date: Thu, 1 Mar 2012 14:53:23 -0800 > To: Ben Hughes <[email protected]<mailto:[email protected]><mailto: > [email protected]>>, marc abel <[email protected]<mailto: > [email protected]><mailto:[email protected]>>, " > [email protected]<mailto:[email protected]><mailto: > [email protected]>" <[email protected]<mailto: > [email protected]><mailto:[email protected]>> > Subject: Re: [OSL | CCIE_RS] Intervlan multicast across switces > I think the question is in regards to capabilities. > Does multicast propogate across trunks without multi-cast routing > distributed enabled? I don't know the answer, so I am also interested in > the answer. > Marc- is that the question? > Regards, > Jay McMickle- CCNP, CCSP, CCDP, MCSE > http://mycciepursuit.wordpress.com/ > Support me in the MS150 Challenge! > > http://main.nationalmssociety.org/site/TR/Bike/TXHBikeEvents?px=5886043&pg=personal&fr_id=17896 > From: Ben Hughes <[email protected]<mailto:[email protected]><mailto: > [email protected]>> > To: marc abel <[email protected]<mailto:[email protected]><mailto: > [email protected]>>; "[email protected]<mailto: > [email protected]><mailto:[email protected]>" < > [email protected]<mailto:[email protected]><mailto: > [email protected]>> > Sent: Thursday, March 1, 2012 4:07 PM > Subject: Re: [OSL | CCIE_RS] Intervlan multicast across switces > Hey Marc, > Storm Control or VACL? I've also had a similar issue at a customer site > before that turned out to be a faulty SFP on the link between switches. > The faulty SFP would allow unicast and broadcast packets across but drop > multicast. > cheers, > Ben. > From: marc abel <[email protected]<mailto:[email protected]><mailto: > [email protected]><mailto:[email protected]<mailto:[email protected]>>> > Date: Thu, 1 Mar 2012 10:58:20 -0600 > To: <[email protected]<mailto:[email protected] > ><mailto:[email protected]><mailto:[email protected] > <mailto:[email protected]>>> > Subject: [OSL | CCIE_RS] Intervlan multicast across switces > If IP multicast routing is not enabled, multicast should > still propagate within the VLAN correct? Is there anything that would > prevent this multicast from flowing across a trunk? I have a situation > where servers in the same VLAN, but plugged into different switches are not > able to communicate by multicast. Can anyone explain why this might be? > Thank you, > Marc > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > Are you a CCNP or CCIE and looking for a job? Check out > www.PlatinumPlacement.com > http://onlinestudylist.com/mailman/listinfo/ccie_rs > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > Are you a CCNP or CCIE and looking for a job? Check out > www.PlatinumPlacement.com > http://onlinestudylist.com/mailman/listinfo/ccie_rs > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > > Are you a CCNP or CCIE and looking for a job? Check out > www.PlatinumPlacement.com > > http://onlinestudylist.com/mailman/listinfo/ccie_rs > _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com http://onlinestudylist.com/mailman/listinfo/ccie_rs
