some notes

[Jon Crowcroft <J.Crowcroft@cs.ucl.ac.uk>]

comparison of 3 points on ip multicast architectural spectrum-


			deering		SM		Express

plus side:
multisrc		y		y		not really

address alloc/adv	y		na		na

secure			?(igmpv3)	?		y

rx count		could		can		y


minus side:
needs 			y		n		n
addr alloc/collision 
avoid

needs core/rp		if pim-dm	y		n	
alloc/discover


balance:
scale			least		middle		most


meanwhile, we can view these are threw variants on a basic service
(pim and cbt can both be enhanced to do SM and express is a case of SM
with the core as source....

Things to work on
ECMP/SM protocol detals
Core Advert/discovery and Host API details
Failure modes
Pros and Cons of Rx counting and cost/accuracy tradeoff....
Possible v6 deployment scheme for SM/Express....

j.