Small Group Multicast

Document Charter Small Group Multicast WG (sgm)
Title Small Group Multicast
Last updated 2003-12-10
State Approved
WG State Concluded
IESG Responsible AD (None)
Charter Edit AD (None)
Send notices to (None)


A number of people in the Internet community have been advocating that 
the IETF consider standardizing a method for handling multicast to 
groups, where "small" is generally understood to be in the range of 
or so participants. The rationale for this is twofold:

1) there are alleged to be a number of very important applications 
have a small numbers of participants per group (e.g. classic audio and 
video conferencing, collaboration tools, etc.) with an extremely large 
number of such groups simultaneously active on the Internet.

2) Existing IP multicast methods, including newer specialized schemes 
like Source Specific Multicast (SSM) are generally thought to have 
scaling problems when there are a very large nubmer of groups, because 
of per-group state in all the intermediate routers.

Because of the range of possible approaches to this problem and the
potential widespread impact on portions of the IP protocol suite, 
implementation, operational practices, etc. of the Internet, the BoF is
being jointly hosted by the Routing and Internet areas, and will be 
chaired by Randy Bush of the OPS area.