hello gang:
I hope some experts like Howard Berkowitz can respond:
question - what is the status of multicasting on the Internet today? Both
technically, and non-technically?
I understand that the first iteration involved some version of PIM (probably
sparse-dense) in an internal network, connected to the MBONE vie DVMRP
tunnels . Many experts disliked this method due to the inherent lack of
scalability of DVMRP and, I believe, there was also no standard way to
allocate group addresses (only via SDR/SAP, I believe)
So, the second iteration consisted of, once again, PIM (almost certainly
sparse-dense) used in an internal network, but with MBGP to connect to the
Internet and MSDP to locate other sources while still providing RP placement
flexibility. And I also thought MASC/MADCAP was an attempt to solve the
whole address allocation problem (but it still leaves several problems
unresolved, like how to allocate addresses fairly).
But now I've noticed yet another group of technologies emerging - BGMP
(which I am told is supposed to be better than MSDP/MBGP, but I don't yet
understand how it is better), bidirectional PIM (which seems to be another
name for CBT), and SSM with IGMP V3 (which still leaves open the question
that how would you know who to block and who not to block?). Plus, I seem
to see less emphasis on CGMP, and more emphasis on RGMP and IGMP snooping.
But the bottom line is that I still don't see too many widespread
consumer-uses of multicasting. I only see real-world uses of multicasting
within companies (financial information in investment companies), or, across
the Internet, meetings of standards bodies.
But, for example, I don't see anything like the Superbowl or the World
Series being delivered via multicast. OK, OK, that's because of corporate
licensing restrictions, but I think you see my point, I don't see a whole
lot of multicasting that delivers information of interest to the average
user.
So, are these new multicasting technologies becoming very popular, and if
so, why (and if not, why not)? And will these technologies make Internet
multicasting more wide-spread, or does that have to do with things like
politics, money, and that kind of thing (layer 8 of the OSI model)?
Exactly what is happening with Internet multicasting?
Thanx
NRF
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=9655&t=9655
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