From: Jian Gu (guxiaojian@gmail.com)
Date: Mon Dec 10 2007 - 15:47:45 ART
On Dec 10, 2007 10:28 AM, Bob Sinclair <bob@bobsinclair.net> wrote:
> Eric Phillips wrote:
> > However, my question is does the source router continue to encapsulate
> the
> > traffic after it is also sending the traffic using the (S,G) SPT?
>
> Nope! Not suppose to.
> > If the source
> > router ceases encapsulating traffic in the PIM-Register message once the
> > (S,G) is completed, why is a PIM-Register-Stop message even needed?
> The RP only builds the S,G tree to the first hop router if the RP has an
> interface on the OILIST for that group. If the RP has a null OILIST (no
> one wants the traffic) then the Register stop is unicast back so that
> traffic does not flow when not needed at all.
#GJ## RP will unicast register stop to first hop router regardless OILIST is
null or not.
>
> > Also, none of those sources seem to describe bi-directional PIM or SSM
> in
> > any great detail, or describe how to implement and troubleshoot them;
> but
> > both are on the blueprint.
> The Doc CD configuration guide will be your best sources for
> bidirectional and SSM. Bidirectional is like spanning-tree: the RP
> designates a root device, ports are either RPF (think root port) or
> Designated Forwarder (think designated port). If neither, ports block
> for that group. No PIM registration at all. No S,G state at all.
> First hop routers forward all traffic to the RP whether wanted or
> not. BIDIR is NOT a substitute for NBMA-mode; the same packet does
> not go in and out the same interface. Think switch flooding.
>
> Lots of detail for SSM in the config guide. All S,G state. No *,G
> state. No RP. Try to avoid getting lost in the URD and V3-Lite sections!
>
> Hth,
>
> --
>
>
> Bob Sinclair CCIE 10427 CCSI 30427
> www.netmasterclass.net
>
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