From: PANDI MOORTHY (moorthypandi@gmail.com)
Date: Wed Jun 21 2006 - 11:54:46 ART
Hi,
For your current question, there is no extra configuration required, (I mean
not required to configure the ip pim nbma-mode) .
1) The rp-agent(Rouetr-B) directly connect to the mapping agent
(Rouetr-A Hub), as long as mapping agent manage to receive the RP-announce
packet (224.0.1.39), other router (Router-C) in this network don't need to
learn this packet
2) The mapping-agent directly connected other client pim routers
(RouterB and RouterC). So the mapping agent message (224.0.1.40) just out
from it,s serial interface, so no tunneling or ip pim nbma-mode required
for this task.
When you issue "show ip pim rp-mapping" you will the Router B will be RP
For example in other way: if Router B is the mapping agent and Router A is
the RP, then you will have problem. The router A manage to receive the
224.0.1.40 packet through the serial interface, but it won't send out
through same interface to router c
So in this case we need tunneling from the router B to router C. because the
224.0.139 and 224.0.140 packet are dense mode packet.
Regards.
Pandi
On 6/20/06, tony hall <tony_hall123@hotmail.co.uk> wrote:
>
> Thanks Victor,
> My understanding was that if spare mode fail(which will in this case) then
> dense mode will take care instead of tunnel intwerface.
>
> Regards,
>
>
> >From: "Victor Cappuccio" <cvictor@protokolgroup.com>
> >To: "'tony hall'" <tony_hall123@hotmail.co.uk>, <ccielab@groupstudy.com>
> >Subject: RE: sparse-dense mode
> >Date: Tue, 20 Jun 2006 10:07:41 -0400
> >
> >
> >Hello Tony
> >
> >From my understanding the ip pim nbma mode would only affect for groups
> >that
> >are in sparse.
> >
> >If you come to the situation that Rp Discovery messages are not reached
> >because the incoming interface and the outgoing interface are the same,
> >then
> >you should think about using a Tunnel between these devices.
> >
> >You can test your lab using the no ip mroute and deb ip mpa to see if
> there
> >is an oil to null or an RPF Failure for any group.
> >
> >And from the PIM NBMA MODE Part: I've heard hear that extra configuration
> >does not makes a question wrong .-
> >
> >HTH
> >Victor.-
> >
> >-----Mensaje original-----
> >De: nobody@groupstudy.com [mailto:nobody@groupstudy.com] En nombre de
> tony
> >hall
> >Enviado el: Martes, 20 de Junio de 2006 09:41 a.m.
> >Para: ccielab@groupstudy.com
> >Asunto: sparse-dense mode
> >
> >Hi Group,
> >I have 3 routers connected in a triagle, Router A, B and C.Router A is
> hub
> >usinfg sub int . .I have to enable RP on router B for 1 group, another RP
> >on
> >
> >router B for different group.Router A is RP-discovery.We need to enable
> PIM
> >spares-Dense mode only on all 3 serial int running FR ( enable spare mode
> >on
> >
> >all int, and let Dense mode to discover all groups if RP fails)
> >.If i enable PIM nbma mode on all 3 serial interface,I get warning that
> >nmba
> >
> >mode is not recommended in this mode but interface still accept the
> >command.
> >
> >Will we loose the point in the lab if we still force PIM NBMA MODE on
> >sparse-dense mode, enabled interfaces ?.
> >
> >Regards.
> >
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