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idmr-minutes-93mar.txt
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1995-03-01
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CURRENT_MEETING_REPORT_
Reported by Tony Ballardie/UCL
Minutes of the Inter-Domain Multicast Routing BOF (IDMR)
The IDMR BOF was chaired by Tony Ballardie. The Minutes were taken by
Benny Rodrig. The CBT Protocol was discussed for the duration of the
session, in particular, the changes in the protocol since last
November's IDMR BOF session.
Multicast Scope Control
One possible solution to multicast scope control was presented based on
having a separate group per level of scope required. This resulted in a
considerable debate as to how multicast scoping should be defined and
the requirements of users it should be able to satisfy. The solution
presented was deemed unsuitable, and it was agreed to continue the the
discussion on the IDMR mailing list. The conclusion was that the Group
should work towards a concise definition of multicast scope control.
Part of the group initiation procedure includes the group initiator
(host) updating DNS (via a system administrator) with the relevant group
information. The concern was raised that the procedure is likely to be
too slow. This part of group initiation may need to be revised to keep
group join latency to a minimum.
Multicast Data Packets
There was a brief discussion on the issue of multicast data packets
carrying the group-id as an IP option. The conclusion however, was that
there was no more suitable alternative.
When a parent/parent link fails, it was decided that both the flush-tree
and re-join mechanisms should be implemented. Which of the two
mechanisms eventually becomes redundant can only be decided after a
period of performance testing.
It was decided that non-primary cores should be less stringent in
accepting join-requests. Also, an additional error detection mechanism
is required by routers to distinguish on-tree packets arriving via a
child as link-level unicast.
The Draft includes no mention of child-parent ``keepalives'' and no
mention of a handshake protocol between a group initiator and potential
cores for that group. The Draft needs updating in these respects.
The control packet format should contain a group-id TYPE as an
additional protocol independence feature.
Finally, Paul Francis gave a brief description of how CBT will run over
PIP.
Attendees
Anthony Ballardie A.Ballardie@cs.ucl.ac.uk
Jim Beers Jim.Beers@cornell.edu
Robert Braden braden@isi.edu
Scott Brim Scott_Brim@cornell.edu
David Carr Carr@acsu.buffalo.edu
Stephen Casner casner@isi.edu
Steve Deering deering@parc.xerox.com
Steve DeJarnett steve@ibmpa.awdpa.ibm.com
Ed Ellesson ellesson@vnet.ibm.com
Chip Elliott celliot@bbn.com
Dino Farinacci dino@cisco.com
Paul Francis Francis@thumper.bellcore.com
Chris Gunner gunner@dsmail.enet.dec.com
Joel Halpern jmh@network.com
Ken Hayward Ken.Hayward@bnr.ca
Robert Hinden hinden@eng.sun.com
Frank Hoffmann hoffmann@dhdibm1.bitnet
Gerd Holzhauer holzhauer1@applelink.apple.com
Tony Li tli@cisco.com
Charles Lynn clynn@bbn.com
Kent Malave kent@bach.austin.ibm.com
Jun Matsukata jm@eng.isas.ac.jp
David Meyer meyer@ns.uoregon.edu
Gerry Meyer gerry@spider.co.uk
Greg Minshall minshall@wc.novell.com
Matthew Morrisey morrisey@wpsp01.hq.aflc.af.mil
William Owens owens@acsu.buffalo.edu
Laura Pate pate@gateway.mitre.org
Geir Pedersen Geir.Pedersen@usit.uio.no
Willi Porten porten@gmd.de
Benny Rodrig 4373580@mcimail.com
Sally Tarquinio sallyt@gateway.mitre.org
Fumio Teraoka tera@csl.sony.co.jp
Paul Traina pst@cisco.com