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- Editor's note: Minutes received 4/14/93. These minutes have not been edited
- and the attendee list has not been appended.
-
- Reported by Tony Ballardie
-
-
- Inter-Domain Multicast Routing BOF Minutes
-
- The IDMR BOF session was held on Friday, 2nd April, 1993, during the
- Columbus IETF meeting. The meeting was chaired by Tony Ballardie,
- University College London. These minutes were taken by Benny Rodrig
- of RND - RAD Network Devices Ltd.
-
- 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.
-
- 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.
-
- 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 Tsuchiya gave a brief description of how CBT will run over
- Pip.
-
-