Do you have IGMP snooping enabled? If you do, broadcast-like multicast doesn't work and as someone else wrote, you will need at least one router on the segment asking as IGMP querier. If that's unfeasible/undoable, just turn off IGMP snooping (enabled by default).
-- Marko Milivojevic - CCIE #18427 (SP R&S) Senior CCIE Instructor - IPexpert On Thu, Mar 1, 2012 at 19:24, marc abel <[email protected]> wrote: > Sorry guys, I have dyslexia with the terms intra and inter. :) > > I meant intra - within the same VLAN. > > On Thu, Mar 1, 2012 at 8:47 PM, Corey Phipps <[email protected]> wrote: > >> I was referring to INTRA VLAN not INTER as the title implied. The Cisco >> url below is a good read which will explain in detail what I am referring >> to. This doc also provides several additional solutions you could use to >> resolve your issue. >> >> >> http://www.cisco.com/en/US/products/hw/switches/ps708/products_tech_note09186a008059a9df.shtml#understand >> >> >> Corey >> >> On Thu, Mar 1, 2012 at 6:11 PM, J D'Silva <[email protected]> wrote: >> >> > 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 >> > >> _______________________________________________ >> 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
