[174263] in North American Network Operators' Group
Re: Multicast Internet Route table.
daemon@ATHENA.MIT.EDU (Dale W. Carder)
Tue Sep 2 12:48:35 2014
X-Original-To: nanog@nanog.org
Date: Tue, 02 Sep 2014 11:48:26 -0500
From: "Dale W. Carder" <dwcarder@wisc.edu>
To: Mikael Abrahamsson <swmike@swm.pp.se>
In-reply-to: <alpine.DEB.2.02.1409021803430.7929@uplift.swm.pp.se>
Cc: nanog@nanog.org
Errors-To: nanog-bounces@nanog.org
Thus spake Mikael Abrahamsson (swmike@swm.pp.se) on Tue, Sep 02, 2014 at 06:05:42PM +0200:
> On Tue, 2 Sep 2014, Octavio Alvarez wrote:
>
> >I have never used interdomain multicast but I imagine the global m-routing
> >table would quickly become large.
>
> I have set up interdomain routing connecting both to a few peers and a Tier1
> transit provider. Not many non-research networks to be seen.
>
> Also, since we didn't use it it kept breaking and I had to fix it every two
> years or so, where it probably had been down for months.
>
> I don't believe in Internet-wide multicast happening in current incarnation,
> it's just too fragile and too few people are using it. It wouldn't scale
> either due to all the state that needs to be kept.
Inter-domain multicast was largely replaced in practice by CDN's.
In addition to scale issues in keeping state, large wireless L1 environments
are hostile to functioning multicast.
Dale
