Re: 1st multicast ping succeeds, the rest fail?

Do you have another path that would be used during a SPT switchover that is
not quite working?

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> From: Bob Sinclair <bob_at_bobsinclair.net>
> Reply-To: Bob Sinclair <bob_at_bobsinclair.net>
> Date: Tue, 1 Jun 2010 08:39:35 -0400
> To: 'JR Garcia' <ttuner_at_gmail.com>, 'Cisco certification'
> <ccielab_at_groupstudy.com>
> Subject: RE: 1st multicast ping succeeds, the rest fail?
> 
> Hi JR,
> 
> This SHOULD not be a shared-tree/source tree cutover problem, because the
> cutover is not supposed to happen if the source tree is broken.
> 
> I think you will see that the first echo reply was the result of the unicast
> PIM registration process.  The first hop router unicasted a source
> registration to the RP, the RP decapsulated it and multicast it to the
> receiver.  The RP sent a unicast registration stop to the first hop router.
> The multicast path between the RP and the source is broken, and the RP never
> actually received the multicast stream.
> 
> To troubleshoot, explore the reverse path from the RP to the source.  You
> could use show ip rpf, or mtrace. To see this decapsulation in action, clear
> ip mroute and enable debug ip pim on the RP.
> 
> HTH,
> 
> Bob Sinclair
> 
> 
> 
>> -----Original Message-----
>> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
>> JR Garcia
>> Sent: Monday, May 31, 2010 7:09 PM
>> To: Cisco certification
>> Subject: 1st multicast ping succeeds, the rest fail?
>> 
>> ive ran into this on a couple labs ive done. just seeing if anyone has
>> an idea.
>> Separate MPLS VPN sites learn the RP through the MPLS cloud,  i throw
>> ip igmp x.x.x.x on an interface, the 1st ping will respond, but any
>> pings after that fail.
>> 
>> i cant seem to find any RPF failures. i dont have any configs
>> off-hand, but was just curious is anyone else has ran to this before.
>> 
>> 
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