From: CiSco Champ (cischamp2009@gmail.com)
Date: Thu Jan 01 2009 - 02:02:27 ARST
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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