Re: Unable to ping Multicast group.

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
>
> 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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Received on Fri Aug 21 2009 - 12:38:57 ART