RE: Purpose of Mapping agent in multicast

From: Brian McGahan (bmcgahan@internetworkexpert.com)
Date: Wed Apr 11 2007 - 13:32:02 ART


        The mapping agent is used to decide which RP will actually
service the multicast group(s) in question. This way if you have
multiple RP's for redundancy the mapping agent can reconverge the
network without additional configuration after one RP goes down.

Brian McGahan, CCIE #8593 (R&S/SP)
bmcgahan@internetworkexpert.com

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-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
premkumar somasundaram
Sent: Wednesday, April 11, 2007 10:29 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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