From: juan_delgado (juan_delgado@etb.net.co)
Date: Tue May 30 2006 - 21:00:23 ART
Thanks Dave,
As far as I know it happens even with sparse mode only configured on every interface. Is not it?
So If I want to guarantee that the multicast group have connectivity even if I loose my RP I have to keep the DM-Fallback option (default).
Regards
Juan
-----Mensaje original-----
De: nobody@groupstudy.com en nombre de Schulz, Dave
Enviado el: mar 30/05/2006 13:15
Para: Juan Delgado; Carlos Campos Torres (ccampost); CCIEin2006; de Witt, Duane
CC: ccielab@groupstudy.com
Asunto: RE: DM fallback
Juan -
I believe that if you configure the no ip pim dm-fallback, that only
access to the multicast group originated from that router will disallow
the dense mode fallback operation. The multicast group, when there is
no RP present or unavailable...will fallback to dense mode.
Dave Schulz
Email: dschulz@dpsciences.com
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Juan Delgado
Sent: Tuesday, May 30, 2006 1:14 PM
To: Carlos Campos Torres (ccampost); CCIEin2006; de Witt, Duane
Cc: ccielab@groupstudy.com
Subject: RE: DM fallback
I just want to clarify something more about this.
This command should be configured on every multicast Router?
And what happened if we combined with no ip pim dm-fallback command?
Regards
Juan
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Carlos Campos Torres (ccampost)
Sent: Viernes, 26 de Mayo de 2006 10:26 a.m.
To: CCIEin2006; de Witt, Duane
Cc: Larry Chuon; Thabo Molefe; ccielab@groupstudy.com
Subject: RE: DM fallback
According to what I know, ip pim spt-threshold command only sets the
threshold to switch from a shared tree to a shortest path tree, as you
know, when using sparse-mode, we will build a (*, G) pair but from
there, the last-hop router will try to join the SPT to the source making
an (S,G) pair. Therefore if you use ip pim spt-threshold infinity you
are forciing the router to use the shared tree and not switchover to the
SPT.
Hope that makes it clearer =)
Carlos Campos
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
CCIEin2006
Sent: Friday, May 26, 2006 9:48 AM
To: de Witt, Duane
Cc: Larry Chuon; Thabo Molefe; ccielab@groupstudy.com
Subject: Re: DM fallback
Although I am also no expert on Multicast, I don't believe that shortest
path and dense mode are one and the same....please correct me if I'm
wrong.
On 5/26/06, de Witt, Duane <duane.dewitt@siemens.com> wrote:
> As far as I know autorp listener is used for configuring autorp in a
> sparse only environment. The command that Thabo is looking for is
> definitely ip pim spt-threshold infinity.
>
> Regards
> Duane
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> Of Larry Chuon
> Sent: 26 May 2006 02:09 PM
> To: Thabo Molefe
> Cc: ccielab@groupstudy.com
> Subject: Re: DM fallback
>
> I think you can use "ip pim autorp listener" under sparse-mode to
> achieve this. The "no ip pim dm-fallback" is for sparse-dense-mode.
> You can also hardcode your RP to yourself as well to avoid falling
> back to dense.
>
> Mcast is not my strongest. Please correct me if I am wrong. Thanks.
>
> On 5/26/06, Thabo Molefe <thabo.molefe@arivia.co.za> wrote:
> >
> > Hi
> >
> >
> >
> > When asked to make sure that no multicast group should reverse to
> > dense-mode when implementing multicast sparse-mode, which of these
> > to commands will be correct:
> >
> >
> >
> > no ip pim fallback
> >
> > or
> >
> > ip pim spt-threshold infinity
> >
> >
> ______________________________________________________________________
> _
> > Subscription information may be found at:
> > http://www.groupstudy.com/list/CCIELab.html
>
> ______________________________________________________________________
> _ Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
> ______________________________________________________________________
> _ Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
_______________________________________________________________________
Subscription information may be found at:
http://www.groupstudy.com/list/CCIELab.html
_______________________________________________________________________
Subscription information may be found at:
http://www.groupstudy.com/list/CCIELab.html
_______________________________________________________________________
Subscription information may be found at:
http://www.groupstudy.com/list/CCIELab.html
_______________________________________________________________________
Subscription information may be found at:
http://www.groupstudy.com/list/CCIELab.html
This archive was generated by hypermail 2.1.4 : Thu Jun 01 2006 - 06:33:22 ART