From: Vincent Mashburn (vmashburn@fedex.com)
Date: Mon Oct 09 2006 - 11:36:13 ART
Try "ip pim nbma-mode" on the hub
Vince Mashburn
Voice / Data Engineer
901-263-5072
CCVP, CCNP, CCDA,Network +
Cisco IP Telephony Support Specialist
Cisco IP Telephony Operations Specialist
-----Original Message-----
From: ghias hassan [mailto:ghias.hassan@gmail.com]
Sent: Monday, October 09, 2006 9:13 AM
To: Vincent Mashburn
Cc: riaz shams; ccielab@groupstudy.com
Subject: Re: multicast question.
the topology he has is hub & spoke and hub router R2 is RP.
in my understanding it will not convert to SPT shorterst path tree
because there is no alternate path.
regards,
ghias.
On 10/9/06, Vincent Mashburn <vmashburn@fedex.com> wrote:
> Since you are using sparse mode and you stated that sometimes it pings
> and sometimes it doesn't, this sounds like a possible spt cutover
issue.
> The RPF check may pass for traffic routed to the RP, but when the SPT
> kicks in, the RPF may fail. I would suggest trying BIDIR and see if
> everything works fine there. If that works, then try using
Sparse-mode
> again, but with "spt-threshold infinity". If this also works, then
you
> know you have a RPF problem in your SPT. Hope this helps.
>
> Vince Mashburn
> Voice / Data Engineer
> 901-263-5072
> CCVP, CCNP, CCDA,Network +
> Cisco IP Telephony Support Specialist
> Cisco IP Telephony Operations Specialist
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> riaz shams
> Sent: Saturday, October 07, 2006 4:28 PM
> To: ccielab@groupstudy.com
> Subject: multicast question.
>
> hi group ,
>
> can anyone pls clear my doubt on this,
>
> three routers, R1 R2 and R3 connected on frame -relay hub and spoke
> style.
> R2 is hub. OSPF is running as a routing protocol and R3's one
interface
> is
> not part of ospf.
>
> i have given igmp-join group on ethernet's interface of R3 and
multicast
> is
> running on all three routers.
>
> now if i ping from R1 to that multicast address , it sometime pings
and
> sometimes not.
> i have also checked RPFs and RP mappings.
>
> do i need to bring that interface's subnet in routing domain for
> multicast
> address to be pingable ?
>
> Tia
> riaz.
>
>
This archive was generated by hypermail 2.1.4 : Wed Nov 01 2006 - 07:29:04 ART