From: Scott Morris (swm@emanon.com)
Date: Tue Jun 26 2007 - 18:53:38 ART
The idea for MSDP has nothing to do with failover. What it has to do with
is that while both RPs are up and going, half of your network goes to one,
the other half to the other one. That means that one half of your network
knows nothing about multicast sources on the other half, and vice-versa.
With MSDP, it will exchange the multicast group/source information so that
everyone knows about everything.
HTH,
Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, JNCIE
#153, CISSP, et al.
CCSI/JNCI-M/JNCI-J
VP - Technical Training - IPexpert, Inc.
IPexpert Sr. Technical Instructor
A Cisco Learning Partner - We Accept Learning Credits!
smorris@ipexpert.com
Telephone: +1.810.326.1444
Fax: +1.810.454.0130
http://www.ipexpert.com
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
johngibson1541@yahoo.com
Sent: Tuesday, June 26, 2007 4:46 PM
To: ccielab@groupstudy.com
Subject: if we just want to have a backup RP, is MSDP needed ?
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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