Confirming source-routed multicast is dead on the public Internet
sean at donelan.com
Thu Aug 2 15:27:49 UTC 2018
Thanks to everyone that helped. Off-list I heard from network engineers
at several global Internet providers. They all confirmed that multicast
is no longer supported on their public Internet backbones, no matter what
their sales people might say. If someone opened a multicast trouble
ticket, likely no one in their NOC would know what to do with it. They
acknowledged there might be some old multicast configs on Internet facing
routers, and eventually they'll clean those out.
Backbone network engineers are fairly blunt.
Multicast is being used in various private IP networks. It seems to work
very well for satellite content distribution because multicast doesn't
require ack's. Enterprise networks also use multicast.
More information about the NANOG