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