From: srdja blagojevic (srdja1@pexim.co.yu)
Date: Sat May 27 2006 - 05:19:50 ART
AFAIK you are not switching to dense mode, you are just switching from RPT
to SPT, because you are stil using explicit join toward multicast source
(sparse mode) and not flood-and-prune (dense mode).
HTH,
Srdja
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
CCIEin2006
Sent: Friday, May 26, 2006 19:08
To: Carlos Campos Torres (ccampost)
Cc: de Witt, Duane; Larry Chuon; Thabo Molefe; ccielab@groupstudy.com
Subject: Re: DM fallback
I understand how the ip pim spt-threshold command works.
What I'm not clear about is when you switchover to SPT does that mean you
are also switching over to Dense mode?
In other words, if you are on the shortest path tree does that mean you are
operating in Dense mode?
Thanks
On 5/26/06, Carlos Campos Torres (ccampost) <ccampost@cisco.com> wrote:
>
> 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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