From: CCIEin2006 (ciscocciein2006@gmail.com)
Date: Fri May 26 2006 - 14:08:11 ART
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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