Re: Unable to ping Multicast group.

Is that what they do for everything, sourced pings.
I ask because I ran into an issue where I can not ping one of my BB routers
after redistributing mutually between two routing protocols and restricting
what routes go to each protocol.

I do see the route to the BB on all my routers I can ping it from my
connected interface but I can not ping it from my other routers unless I do
a sourced ping using the local loopback.

On Fri, Aug 21, 2009 at 7:03 AM, Ravi Singh <way2ccie_at_googlemail.com> wrote:

> Hi Nishant,
>
> To contribute my 2 cents here, this sounds quite similar to a problem I
> faced a while back. Here is a link to the archive in case you wish to have
> a
> look.
>
> http://www.groupstudy.com/archives/ccielab/200903/msg01550.html
>
> But just to summarise on what I could suggest is you could try it with a
> different IOS version, preferably an older one . I have often had different
> behaviours with different IOS versions when it comes to multicast .
> And for the question regarding how it is checked in the actual lab, I agree
> with Rick. It will have to be verified with an extended ping and also a
> source-interface if needed.
>
> Ravi
>
> On Fri, Aug 21, 2009 at 8:08 AM, Nishant Aggarwal <
> er.nishantaggarwal_at_gmail.com> wrote:
>
> > I am able to ping from R6 and R3 and I am concerned with R5 only now.
> >
> > Thanks,
> > Nishant Aggarwal
> >
> > On Fri, Aug 21, 2009 at 12:08 PM, Rick Mur <rmur_at_ipexpert.com> wrote:
> >
> > > It sounds like R5 is choosing Fa0/0 as standard source interface. Do a
> > ping
> > > with a source-interface of serial2/0. You should get an ICMP reply
> then.
> > > Especially on frame-relay interfaces it's possible to receive a couple
> of
> > > replies, since frame-relay is not really a broadcasting medium, that's
> > why
> > > the broadcast traffic is not really well supported. Getting multiple
> > replies
> > > is nothing wrong with, just normal behavior.
> > >
> > > It's also normal if the first ping in multicast doesn't get through.
> You
> > > will not have any problems with the 2nd, 3rd and all other packets. I'm
> > > convinced that the proctors script will do a repeat 3 or repeat 5 if
> they
> > > ping multicast groups.
> > >
> > >
> > >
> > > --
> > > Regards,
> > >
> > > Rick Mur
> > > CCIE2 #21946 (R&S / Service Provider)
> > > Juniper JNCIA-ER & JNCIA-EX
> > > MCSA:Messaging, MCSE
> > > Sr. Support Engineer IPexpert, Inc.
> > > URL: http://www.IPexpert.com <http://www.ipexpert.com/>
> > >
> > > On Fri, Aug 21, 2009 at 4:02 AM, Nishant Aggarwal <
> > > er.nishantaggarwal_at_gmail.com> wrote:
> > >
> > >> Hi All,
> > >>
> > >> Multicast qestion.
> > >>
> > >> Topology:
> > >>
> > >> R6 <---FR----> R3 <-----FR-------> R5
> > >>
> > >> R6 Config:---------------------------------
> > >>
> > >> Int fa0/0
> > >> ip pim sparse-mode
> > >> ip igmp join 224.2.2.2
> > >> int se2/0
> > >> ip pim sparse-mode
> > >>
> > >> ip pim autorp listener
> > >>
> > >> R3 Config:---------------------------------
> > >>
> > >> int lo0
> > >> ip pim sparse-mode
> > >> int se2/0
> > >> ip pim sparse-mode
> > >> int se2/1
> > >> ip pim sparse-mode
> > >>
> > >> ip pim autorp listener
> > >> ip pim send-rp-announce Loopback0 scope 16 group-list 10
> > >> ip pim send-rp-discovery Loopback0 scope 16
> > >> access-list 10 per 224.2.2.2
> > >>
> > >> R5 Config:---------------------------------
> > >>
> > >> int se2/0
> > >> ip pim sparse-mode
> > >>
> > >> ip pim autorp listener
> > >>
> > >> There is no other interface on R5 on which multicast is running. I am
> > >> getting RP mappings on all devices.
> > >>
> > >> 1. When I ping 224.2.2.2 (AT R6) from R5, I get not even a single
> ping,
> > >> why?
> > >>
> > >> 2. When I configure sparse-mode on Fa0/0 of R5, I get 2 or 3 pings,
> why?
> > >>
> > >> 3. Also if I go for extended ping (Assume sparse on Fa0/0) by giving
> > >> Interface : Serial2/0 and source ip : Fa0/0 ip, I get continuous ping.
> > >>
> > >> Please guide what is the reason of Qestion 1 and 2.
> > >> Also clarify that the script run by proctor to your grade lab, will
> > >> check my solution with extended ping and pass it OR just check with
> > >> normal ping and fail me??
> > >>
> > >> What is the solution to resolve the issue?
> > >>
> > >> Thanks,
> > >> Nishant Aggarwal.
> > >>
> > >>
> > >> Blogs and organic groups at http://www.ccie.net
> > >>
> > >>
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Received on Fri Aug 21 2009 - 19:38:16 ART