Re: Bidirectional PIM

i labbed this up to prove it... and even if routerA is the receiver AND the
source it will still send the traffic to the RP( routerB) first and then
receive it back....if Bi-directional pim is enabled for that group on the RP

2009/7/5 Swap <ccie19804_at_gmail.com>

> Straight out of my notes -
>
> Bidirectional PIM acts a little bit differently from PIM-SM and
> particularly
> with SPT, simply there are no source-based trees, instead RP builds a
> shared
> tree through which source routers forward traffic downstream toward the RP
> in the same time RP can use the same shared tree to send the multicast
> traffic received upstream to a receiver.
>
> Because there is no SPT, there could not be any SPT switchover and the
> traffic forwarding will always pass through RP.
>
> Regards,
> Swap
> #19804
>
> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> Pradeep Malik
> Sent: Sunday, July 05, 2009 4:43 PM
> To: Cisco certification
> Subject: Bidirectional PIM
>
> Gents,
>
> Trying to understand packet forwarding in case of Bidirectional PIM.
> Cisco
> Docs suggest that Bi direrectional PIM deviates from PIM-SM when passing
> traffic from sources upstream toward the RP.
>
> I have a question for a scenerio where source is sending packets upstream
> towards RP and there is a receiver in between . How would be the traffic
> flow in such case ? Will SPT for optimal path routing be involved ??
>
> Suggestions are welcome...
>
> Thanks in advance !
>
> Cheers,
>
> PM
>
>
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Received on Sun Jul 05 2009 - 21:58:57 ART