From: premkumar somasundaram (premkumar.somasundaram@gmail.com)
Date: Thu Apr 12 2007 - 18:55:03 ART
Thanks Scott & Brian.
On 4/11/07, Scott Morris <smorris@ipexpert.com> wrote:
>
> 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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