From: Scott Morris (smorris@ipexpert.com)
Date: Wed Apr 11 2007 - 17:42:24 ART
It means two different groups are used for two different purposes.
224.0.1.39 is what the RP will announce on. So as soon as you use the "ip
pim send-rp-announce" command to set up an RP, you'll see that all your
routers should belong to 224.0.1.39 when you do "show ip mroute".
Yet, when you do "show ip pim rp mapping" you have nothing. As soon as you
add a mapping agent, you'll find that everyone joins 224.0.1.40 to see the
"approved list" of RPs. And NOW when you do "show ip pim rp mapping" you'll
find entries in there about your RPs.
So they are both necessary based on the way that Auto-RP was designed.
HTH,
Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, JNCIE
#153, CISSP, et al.
CCSI/JNCI-M/JNCI-J
IPexpert VP - Curriculum Development
IPexpert Sr. Technical Instructor
smorris@ipexpert.com
http://www.ipexpert.com
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
premkumar somasundaram
Sent: Wednesday, April 11, 2007 11:29 AM
To: ccielab@groupstudy.com
Subject: Re: Purpose of Mapping agent in multicast
> Could any one tell me the purpose of mapping agent. The doc says that
> it uses 224.0.1.40 <http://224.0.0.40/> to advertise the RP
> information to other routers. But we have a candiadate RP announces it
> self as a RP with
> 224.0.1.39 <http://224.0.0.39/>. Both of these groups are seen in
> multicast routing table of all the routers. Does this mean we have
> redundant information of RP?? Is my understanding correct??
>
> Thanks
> Prem
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