From: McCallum, Robert (robert.mccallum@thus.net)
Date: Mon Feb 27 2006 - 18:56:01 GMT-3
Yip but with a few differences ;-)
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> Behalf Of CCIEin2006
> Sent: 27 February 2006 21:29
> To: Bob Sinclair
> Cc: ccielab@groupstudy.com
> Subject: Re: Difference between Bidirectional PIM and PIM Sparse Mode
>
> Hmm kinda sounds like sparse mode with the spt-threshold set
> to infinity....
>
> On 2/27/06, Bob Sinclair <bob@bobsinclair.net> wrote:
> >
> > BIDIR is a strange beast:
> >
> > Unlike Dense mode, Bidir does not flood to all PIM
> neighbors, only up
> > the shortest path tree to the RP. If there are no clients who want
> > traffic, then Dense will prune back. BIDIR only prunes back to the
> > RP, then the RP drop it. Traffic continues to be forwarded
> from the
> > source to the RP as long as it is active. Receivers join
> much like regular sparse-mode:
> > explicit joins toward the RP.
> >
> > BIDIR is a lot like spanning-tree: think of RPF interface as root
> > port; think of DF interface as designated port. Basic rule
> then is if
> > a port is not RPF or DF, then it cannot forward for the group. In
> > fact, BIDIR is similar to Core Based Tree, which Radia
> Perlman had a hand in developing.
> >
> > Good for many-to-many multicast because it minimizes state.
> >
> > Try labbing it up and doing some "debug ip mpacket". Just enable
> > globally (ip pim bidir-enable) and add the "bidir" keyword
> to your RP
> > statements.
> >
> >
> > Bob Sinclair
> > CCIE #10427, CCSI 30427
> > www.netmasterclass.net
> >
> >
> > ----- Original Message -----
> > *From:* CCIEin2006 <ciscocciein2006@gmail.com>
> > *To:* Bob Sinclair <bob@bobsinclair.net>
> > *Cc:* ccielab@groupstudy.com
> > *Sent:* Monday, February 27, 2006 1:24 PM
> > *Subject:* Re: Difference between Bidirectional PIM and PIM Sparse
> > Mode
> >
> >
> > Hi Bob,
> >
> > Since the first hop routers forward the traffic whether its
> wanted or
> > not, isn't that like dense mode?
> >
> > Do receivers still send joins to the RP?
> >
> > What does the RP do with the traffic if there are no
> receivers - send
> > a prune?
> >
> > Thanks!
> >
> > On 2/27/06, Bob Sinclair <bob@bobsinclair.net> wrote:
> > >
> > > Bidirectional PIM Differs from Sparse mode in at least these ways:
> > >
> > > Bidir does not maintain any (S,G) state. Only (*,G)
> state. This is
> > what
> > > makes it scalable for many-to-may multicast.
> > >
> > > Bidir does not do PIM registration. First-hop routers do not
> > > register traffic with the RP. First hop routers, forward traffic
> > > for active
> > groups
> > > toward the RP, whether anyone wants the traffic or not,
> as long as
> > > the
> > group
> > > is active.
> > >
> > > Since there is no PIM registration, the RP does not
> actually have to
> > > be
> > a
> > > reachable address, only a reachable network that acts as a root.
> > >
> > > Here is a link with more info:
> > >
> > >
> > >
> >
> >
> http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/product
> s_configuration
> > _guide_chapter09186a00800ca796.html
> > >
> > >
> > > HTH,
> > >
> > > Bob Sinclair
> > > CCIE #10427, CCSI 30427
> > > www.netmasterclass.net
> > >
> > >
> > > ----- Original Message -----
> > > *From:* CCIEin2006 <ciscocciein2006@gmail.com>
> > > *To:* ccielab@groupstudy.com
> > > *Sent:* Monday, February 27, 2006 11:28 AM
> > > *Subject:* Difference between Bidirectional PIM and PIM
> Sparse Mode
> > >
> > >
> > > Hello group,
> > >
> > > I am not very clear on the differences between
> Bidirectional PIM and
> > > PIM Sparse Mode. Both use the RP and switchover to shortest path
> > > tree after the first packet is received, correct?
> > >
> > > How do they differ exactly?
> > >
> > >
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