All things related to multicast

["Zhu Nan" <>]

    Hi all, are there any periodic broadcasting service on the Internet ,and 
it can provide Near-VOD video service in practice ?  Can you give me some 
examples ? or just prototype is also OK.

    I know to deploy periodic broadcasting in a local network is easy. but 
how about running on a wider network such as Internet, across AS? the same 
easy?

    There are some periodic broadcast schemes such as Pyramid, Skyscraper and 
GDB... with fully analysis and discuss. But are there any such system in 
practice?

    I know there are lots broadcasting system in real time works, but I hear 
no periodic broadcasting example with Near-VOD service. Tell me some.  Thank 
you.