Re: Unable to ping Multicast group.

What do you understand under an extended ping? Of course they use a ping
with a repeat or maybe even a source-interface, since they could ask that
some multicast group is ping-able from a specified interface.

That way I think you can say they are using extended ping. At least that is
what I continuously use to verify my multicast configurations. Certainly the
repeat count, as 1 ping is never enough to verify your multicast routing
(due to switching over from shared tree to shortest path tree).

--
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 9:08 AM, Nishant Aggarwal <
er.nishantaggarwal_at_gmail.com> wrote:
> Thanks all for your concern.
>
> Problem is that when only Serial of R5 is in Sparse mode, I am not getting
> pings. When I put sparse mode on Fa0/0, I get a few. I think this is due to
> the DR selection.
>
> If I put Loopback interface in Sparse mode, replies are through.
>
> But I think I can not put any other interface in any pim mode untill it is
> specified. However if sparse mode is requested on Fa0/0, then perhaps we
can
> increase the DR priority.
>
> Do they check with extended pings or only normal pings. Please make me
> understandwith proctor's view.
>
> 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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