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

Nick Hilliard <nick@foobar.org> Thu, 26 March 2020 21:25 UTC

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To: Dino Farinacci <farinacci@gmail.com>
Cc: Randy Bush <randy@psg.com>, MBONED WG <mboned@ietf.org>, Leonard Giuliano <lenny@juniper.net>, IETF Rinse Repeat <ietf@ietf.org>
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From: Nick Hilliard <nick@foobar.org>
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Date: Thu, 26 Mar 2020 21:25:26 +0000
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Subject: Re: [MBONED] MBONE Deployment (mboned) WG Virtual Meeting: 2020-04-21
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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

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