From: Harindha Fernando (pottaharry@gmail.com)
Date: Tue Jul 08 2008 - 11:44:33 ART
my understanding also same,
On Tue, Jul 8, 2008 at 5:29 PM, Learn Cisco <cisco.learn@yahoo.com> wrote:
> i believe it reverts to a source-based tree after consulting the RP for
> each
> multicast session, but i believe it only truly goes to dense-mode if an RP
> is
> not known, right?
>
>
>
> ----- Original Message ----
> From: Harindha Fernando
> <pottaharry@gmail.com>
> To: Joseph Brunner <joe@affirmedsystems.com>
> Cc: John
> <jgarrison1@austin.rr.com>; Learn Cisco <cisco.learn@yahoo.com>;
> ccielab@groupstudy.com
> Sent: Tuesday, July 8, 2008 4:33:14 AM
> Subject: Re:
> Multicast Features
>
> I checked on the lab
>
> show ip multicast
>
> will give u the
> fallback mode
>
> 224.0.1.40 and 224.0.1.39 is for auto-rp rp announce and rp
> discovery
> (mapping agent), it will be in dense mode if you have configured IP
> PIM
> SM-DM but if you have only PIM SM configured on interface then you need ip
> pim autorp listener to allow autorp packets to cross sparse mode
> interfaces.
> On Tue, Jul 8, 2008 at 9:46 AM, Joseph Brunner <joe@affirmedsystems.com>
> wrote:
>
> > Where did you read that?
> >
> > even with all sparse-mode interfaces,
> check 224.0..1.40 and any other group
> > with no rp...
> >
> > -----Original
> Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> Behalf Of
> > Harindha Fernando
> > Sent: Tuesday, July 08, 2008 2:39 AM
> > To:
> John
> > Cc: Learn Cisco; ccielab@groupstudy.com
> > Subject: Re: Multicast
> Features
> >
> > Hi,
> >
> > If you have configured all the interfaces to PIM-SM then
> fallback mode will
> > be sparse , if you have at least one interface with
> SM-DM then
> > fallback mode will be Dense, by putting no ip pim
> dm-fallback
> > guaranties that fallback will be in Sparse mode.
> >
> > Rgds,
> >
> Harri
> >
> > On Tue, Jul 8, 2008 at 3:31 AM, John <jgarrison1@austin.rr.com>
> wrote:
> >
> > > spt-threshhold is for source tree. The default is 0 kbs, which
> means
> > that
> > > anything over 0 kbs will go to a source tree. no ip pim-dm
> fallback is
> > to
> > > prevent, at least sparse-dense mode from falling back to
> dense mode for
> > > unknown groups. In the docs I've seen it used in sparse
> mode and
> > sometimes
> > > not. I'm still trying to find a definitive answer on
> that. Ill probably
> > > end up labbing it on friday and then I'll know for
> sure.
> > >
> > >
> > >
> > > "The mind is like a parachute it works best when it's
> open"
> > > ----- Original Message ----- From: "Learn Cisco"
> <cisco.learn@yahoo.com>
> > > To: <ccielab@groupstudy.com>
> > > Cc:
> <cisco.learn@yahoo.com>
> > > Sent: Monday, July 07, 2008 5:27 PM
> > > Subject:
> Multicast Features
> > >
> > >
> > >
> > > hi, i'm trying to get a better grasp on
> multicast topics. any feedback
> > to
> > >> the following questions would be
> much appreciated:
> > >>
> > >> 1.) was wondering if anyone can help differentiate
> between the use of
> > "ip
> > >> pim spt-threshold infinity" and "no ip pim
> dm-fallback". they both seem
> > to
> > >> prevent sparse-dense-mode and/or
> sparse-mode pim from reverting back to
> > a
> > >> sourced-tree / shortest-path
> tree unless I'm missing something.
> > >>
> > >> 2.) would "ip pim accept-rp
> auto-rp" be needed along with one of the
> > cmds
> > >> above to ensure no spt
> paths form?
> > >>
> > >> 3..) when would "ip pim accept-rp x.x.x.x x" be used? i
> guess if i get a
> > >> question/requirement that states to have a device accept
> join/prune
> > messages
> > >> for an rp i'd know to use this feature, but it
> seems as though their
> > might
> > >> be more to this thing???
> > >>
> > >> 4.) "ip
> pim autorp listener" is the feature to use when desiring to use
> > >>
> sparse-mode along with auto-rp, right? (without statically assigning
> > the
> >
> rp
> > >> mapping on all sparse-mode devices)
> > >>
> > >> thanks in advance for
> any input,
> > >>
> > >>
> > >>
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> > >
> > >
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> >
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> >
> >
> >
> _______________________________________________________________________
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