Multicast Internet Route table.

Dale W. Carder dwcarder at
Tue Sep 2 16:48:26 UTC 2014

Thus spake Mikael Abrahamsson (swmike at 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.


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