From: CiSco Champ (cischamp2009@gmail.com)
Date: Thu Jan 01 2009 - 18:26:58 ARST
please answer my question also, if i am not recieving ping reply, this can
be because of PIM DR position in sagment ?
Thanks
On Thu, Jan 1, 2009 at 11:40 PM, Jared Scrivener <jscrivener@ipexpert.com>wrote:
> If you aren't receiving a reply then go from router to router in your
> network doing a "show ip mroute". Check that the incoming interface shown
> for the (S,G) entry matches the path that the multicast packet should take
> based on the outgoing interface for the same (S,G) entry on the router
> closer to the source.
>
> Presuming you've setup PIM correctly and each router knows the RP for that
> group, chances are your issues will be a result of an RPF check failure (or
> a missing IPv4 route).
>
> Cheers,
>
> Jared Scrivener CCIE3 #16983 (R&S, Security, SP), CISSP
> Technical Instructor - IPexpert, Inc.
> Telephone: +1.810.326.1444
> Fax: +1.810.454.0130
> Mailto: jscrivener@ipexpert.com
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> CiSco Champ
> Sent: Wednesday, 31 December 2008 11:02 PM
> To: joshua atterbury
> Cc: Rado Vasilev; John Edom; ccielab@groupstudy.com
> Subject: Re: Multiicast Troubleshooting
>
> thanks for answering, it obviousely help me. if i am not recieving ping
> reply, this can be because of PIM DR position in sagment ?
>
> Regards
>
> On Thu, Jan 1, 2009 at 7:54 AM, joshua atterbury
> <joshuaatterbury@gmail.com>wrote:
>
> > For your last question about pinging a multicast group.
> >
> > When you ping a multicast group, The router originates a ping request for
> > all pim enabled loopbacks and the physical pim enabled interface.
> >
> > To check this scenario do a "debug ip mpacket" on a router then run the
> > ping
> > command, This will show you all the mcast ping packets, Beaware that if
> > you
> > are testing things like ttl thresholds etc then the results can be
> > confusing
> > at first, As the pings originated from the loopback will have their ttl
> > value as 1 lower than the packet originated from the physical interface.
> > Due
> > to these packets being routed from the loopback to the physical
> interface.
> >
> > Hope this helps.
> >
> > Josh.
> >
> >
> > On Thu, Jan 1, 2009 at 1:27 PM, Rado Vasilev <decklandv@gmail.com>
> wrote:
> >
> > > Hi,
> > >>
> > >> I am good in configuring Multicast but weak in it troubleshooting if
> > >> devices
> > >> are not giving required result. Anyone please tell me some commands
> and
> > >> steps to identify cause of problem?
> > >>
> > >
> > > usually problems are related to failed RPF check.
> > >
> > >>
> > >>
> > >> Tell me for troubleshooting, i enable "debug ip mrouting", "debug ip
> > >> mpacket" but don't get any debug report when ping multicast group what
> > >> would
> > >> be reason ?
> > >>
> > >
> > > configure 'no ip mroute-cache' on the interfaces first.'
> > >
> > >
> > >> Another thing when we ping a multicast group, will source ip be of
> > >> loopback
> > >> interface ?
> > >>
> > >
> > >
> > > all ifaces
> > >
> > >
> > >
> > >
> > > regards,
> > > rado
> > >
> > >
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