Re: Mapping agent in auto-rp

in case of multiple MA, all Mapping Agents multicast the contents of their
Group-to-RP mapping cache in RP-Discovery messages to all Clients. so client
will receive multiple copies. This Group-to-RP mapping cache will always be
same for both the MA as both MA apply the same concept for storing the
cache.

Multiple MA will maintain their own set of Group-to-RP mapping cache
(independent of other MA). If more than one Mapping Agent is to be used, the
filters must be consistent across all Mapping Agents so that no conflicts
occur in the Group-to-RP mapping information.

HTH
Swap
#19804

On Wed, Sep 30, 2009 at 10:27 PM, Anantha Subramanian Natarajan <
anantha.natarajan_at_gravitant.com> wrote:

> 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
> >
> > "There is no 'patch' for stupidity." - www.sqlsecurity.com
>
>
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Received on Thu Oct 01 2009 - 11:58:35 ART