RE: Bidirectional PIM

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 Mon Jul 06 2009 - 00:49:38 ART