From: Carlos Campos Torres \(ccampost\) (ccampost@cisco.com)
Date: Fri May 26 2006 - 12:25:32 ART
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
> >
> >
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