if we just want to have a backup RP, is MSDP needed ?

From: johngibson1541@yahoo.com
Date: Tue Jun 26 2007 - 17:45:41 ART

I know MSDP application AncastRP can be used to backup RP.

I have experimented using 2 loopback interfaces in 2 routers
to backup each other as the RP address using 1 single IP address.

I don't use any MSDP , I have no problem switching over from
1 RP to another.

I know univrecd says the AncastRP application has no effect
on those receiver-source pairs that are actively receiving/sending
data because they are using shortest trees and RP is irrelevant.

So, in my experiment, I stop the receiver as primary RP fails
in purpose just to see receiving leaf router triggering (*,G)
toward RP from scratch. It works fine.

univercd says MSDP is good for monitoring continuously active source.

My source is actively sending data throughout entire experiment too.

I don't understand why we need MSDP for this purpose.

I know there must be some subtle difference MSDP brings
I just don't understand.

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