Re: Mapping agent in auto-rp

Hi Garry,

  Nice link and thanks for sharing ........

  I am still not able to understand a mechanism,if exist,to choose which RP
mapping agent will be information source to all the Multicast routers to
provide RP to group mapping

Say for example ---A mapping agent with address (10.1.1.1/32) and the other
one with (10.1.2.1/32),I would assume that both will have group-to-rp
mappings and who will be responsible for advertising the group-to-rp
mappings.

Thanks

Regards
Anantha Subramanian Natarajan

On Wed, Sep 30, 2009 at 12:59 PM, garry baker <baker.garry_at_gmail.com> wrote:

> great write up on multicast
>
>
> http://www.netcraftsmen.net/resources/archived-articles/375-ip-multicast-and-pim-rendezvous-points.html
>
> "Because the Auto-RP mapping agents use the highest RP for each group or
> range, you can have redundant RP's. If the one with the highest address
> fails, the next one will take over (after the cache hold time expires). If
> you have redundant Auto-RP mapping agents, as long as they advertise the
> same information, there is no problem. You do need to make sure candidate
> RP's use a large enough scope to reach all the mapping agents."
>
> On Wed, Sep 30, 2009 at 1:38 PM, Anantha Subramanian Natarajan <
> anantha.natarajan_at_gravitant.com> wrote:
>
>> Hi All,
>>
>> I have a question on auto-rp mapping agent.If there are 2 RPs advertising
>> themself as RP for a group,the RP with highest IP address would be choosed
>> as RP for that group(Please correct me if I am wrong) by mapping
>> agent.Similarly is there a mechanism from whom the multicast domain
>> router/switches would hear about the RP from(I mean from which mapping
>> agent).Atleast when I labbed it up,it doesn't seems have correlation with
>> highest ip address for which mapping agent would be source of information
>> about RP for a group.
>>
>> Kindly clarify the same.
>>
>> Thanks for the assistance
>>
>> Regards
>> Anantha Subramanian Natarajan
>>
>>
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>
>
> --
> Garry L. Baker
>
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Received on Wed Sep 30 2009 - 13:27:35 ART