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Re: [MBONED] MBONE Deployment (mboned) WG Virtual Meeting: 2020-04-21

Greg Shepherd <gjshep@gmail.com> Thu, 26 March 2020 21:30 UTC

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Reply-To: gjshep@gmail.com
From: Greg Shepherd <gjshep@gmail.com>
Date: Thu, 26 Mar 2020 14:30:44 -0700
Message-ID: <CABFReBpUTFU2LNP=-beVActGG6bjkhQ6VMMWs-fVU=fNhe2b9Q@mail.gmail.com>
To: Nick Hilliard <nick@foobar.org>
Cc: Dino Farinacci <farinacci@gmail.com>, Randy Bush <randy@psg.com>, MBONED WG <mboned@ietf.org>, IETF Rinse Repeat <ietf@ietf.org>
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Subject: Re: [MBONED] MBONE Deployment (mboned) WG Virtual Meeting: 2020-04-21
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On Thu, Mar 26, 2020 at 2:25 PM Nick Hilliard <nick@foobar.org> wrote:

> Dino Farinacci wrote on 26/03/2020 20:24:
> > An (S,G) entry is a route. You know modern routers can support many
> > orders of magnitude of 1000 routes. I am answering your question of
> > scale in terms of number of routes. If you mean something else, than
> > just say so.
>
> this is kinda the problem though: multicast resource usage on
> intermediate routers scales according to the number of sessions going
> through those routers.  The more sessions, the more state that the
> routers need to maintain.  This is fundamentally different from unicast
> where it doesn't matter to the router how many sessions or data flows
> are passing through it.
>
> We tried session based routing years ago.  It was an interesting idea at
> the time but it didn't work at scale.
>
> Nick


Yes, and your IGP won't scale globally either. Fortunately solutions evolve
so we don't need to just bash the past.

https://datatracker.ietf.org/doc/rfc8279/

- Shep


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