[j-nsp] Interdomain MSDP session from non RP

[Doug Marschke]

It is usually done that way to save that extra internal MSDP session. You
are correct in that either way will produce a functional network.  Another
factor to take into account is the RPF check performed by MSDP.  IMHO, it
makes the RPF checking a bit easier to understand/debug when you have RP to
RP Multicast peering.

Doug



-----Original Message-----
From: juniper-nsp-bounces at puck.nether.net
[mailto:juniper-nsp-bounces at puck.nether.net] On Behalf Of Tantsura, Jeff
Sent: Friday, December 02, 2005 10:29 AM
To: wg-multicast at internet2.edu
Cc: 'juniper-nsp at puck.nether.net'
Subject: [j-nsp] Interdomain MSDP session from non RP

Hi,

In ALL interdomain multicast docs you could see that interdomain MSDP
session are always setup between RP's in both domains. 
I have also found that it is recommended to do it this way.
It sounds logic if RP is close to the border but why would you setup it this
way if RP is many hops away, 
in my opinion a border router or RR which runs eMBGP would run eMSDP just
fine, as long as it has iMSDP session with RP.

Any suggestion would be highly appreciated,

Thanks,
Jeff

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