Re: Unable to ping Multicast group.

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
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.
>
>
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