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Re: [pim] [External] Re: draft-ietf-pim-multicast-lessons-learned-02 & BIDIR-PIM

"Stevens, Jim A Collins" <James.A.Stevens@collins.com> Fri, 01 December 2023 23:00 UTC

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From: "Stevens, Jim A Collins" <James.A.Stevens@collins.com>
To: Dino Farinacci <farinacci@gmail.com>
CC: "pim@ietf.org" <pim@ietf.org>, Michael McBride <michael.mcbride@futurewei.com>
Thread-Topic: [External] Re: draft-ietf-pim-multicast-lessons-learned-02 & BIDIR-PIM
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Date: Fri, 01 Dec 2023 22:59:52 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/pim/MYJ2JWHcR7aJiatmgbeZN30dfIg>
Subject: Re: [pim] [External] Re: draft-ietf-pim-multicast-lessons-learned-02 & BIDIR-PIM
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Dino - thanks for your prompt replay.  Here's feedback to some of your comments

> >> Note also, "the single source node" is the same as the "Bidir RP".
> >> Its just a target for the destination of joins and packets that flow
> >> upstream (towards that target).
> >
> > Agree.  Interesting question.  Is SSM-BIRDIR-PIM where the Source is the RP
> a simpler PIM protocol that PIM-SM-SSM?
>
> Well there is no such thing as SSM-BIDIR-PIM but to answer your question the
> source is not the RP because the RP address is never used as a source address
> in a multicast data pakcet. But in the control-plane they are the target for the
> path the join takes.

Note that the BIDIR-PIM RP can be a real, actual IP address or a fictitious address.  And agree that there is no such thing as SSM-BIDIR-PIM.

But, if we wanted to create a PIM-BIDIR-SSM mode, we could define the RP to be the source for SSM-BIDIR-PIM. In this case, routers would not forward the traffic unless it is transmitted from the source which is the RP.  The interesting question then is whether such a PIM-BIDIR-SSM is more efficient or basically identical to PIM-SM-SSM?


Later comment about inter-domain ASM:
> Well if more than one service provider is willing to share its RP with joiners in
> another, there is no problem. We do it with DNS but people will argue that is a
> control-plane function where using another SP's router to launch packets to
> (when sources are not in the SP with the RP) is a concern.
>
> But I would argue this is theh perfect case to use Bidir-PIM because in Bidir the
> RP can be a ficitious address and not a real router/server in the network. The
> address just needs to be routable to their is directionality for upstream packets

Agree


Cheers,
Jim

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