Several providers have deployed/are deploying NATIVE multicast today on their "production" IP networks today (many have had intra-domain enabled for years),
Do i miss something or was the problem of letting end-users to inject routing information w/o opening backbone to very "interesting" attacks was somehow fixed?
and deploying inter-domain mulicast via existing direct interconnects and the MIXs. Not only is there a b/w savings, there's a huge savings on the source side as well.
Please. Caching is _at least_ as efficient as multicasting (multicasting ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ _is_ caching, with zero retention time) - w/o associated security and scalability problems. Presenting L2/L3 multicasting as the best or the only or even a meaningful way to reduce transmission duplication is quite wrong. This is just what I HAVE SAYING.