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- CURRENT_MEETING_REPORT_
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-
- Reported by Dino Farinacci/cisco Systems
-
- MOSPF Minutes
-
- The Multicast Extensions to OSPF Working Group met Thursday, August 1,
- at the Atlanta IETF. The meeting Agenda was:
-
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- o Introductions, roster, assign note taker.
- o Progress of draft.
- o Review of July draft.
- o Progress of implementation.
- o OSIfication of specification.
- o Multicast scoping.
-
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- Progress of Draft.
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- John Moy (author of spec), felt the specification was ready for protocol
- review but not quite ready to implement from. The following are missing
- sections:
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- o System requirements. (i.e., manipulating multicast filters in
- media controllers).
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- o Data structures.
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- o Detailed description for forwarding multicast datagrams.
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- o Detailed description for forwarding cache construction.
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- o Additions to base OSPF specification.
-
- - How to flood group-membership LSAs.
- - Database Description process with new option bits.
- - Generation of Summary LSAs.
-
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- Review of July Draft.
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- Changes from previous draft (distributed at St. Louis IETF) included:
-
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- o Added concept of a ``Inter-area multicast forwarder''. The reason
- for this is that all ABRs do not need to forward multicast traffic.
-
- o Inter-AS multicast section is new.
-
- o Requirements on Inter-AS protocol are identified. Must determine
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- if a multicast datagram came from outside of AS or from its own AS
- going outside.
-
- o Reverse costs will be used for inter-area and inter-AS
- multicasting. John Moy described a scenario where problems will
- occur when reverse costs are used (in the case of the above bullet)
- in combination with forward costs used inside an area. It was
- determined that the problem can be corrected if reverse costs are
- used everywhere.
-
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- Progress of Implementations.
-
- Initially there will be two implementations from Proteon and public
- domain source gated (Cornell).
-
- Steve Deering, from Xerox, is working on modifications to the BSD Unix
- kernel for forwarding multicast datagrams. He briefly described the
- data structure for the forwarding cache. The key to access the cache is
- based on the tuple (source network, destination group, TOS).
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- OSIfication of Specification.
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- Steve Deering presented IP multicasting to the ANSI X3S3.3 committee.
- The group is interested to use this research for OSI multicasting but no
- work has begun.
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- Multicast Scoping.
-
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- o TTL is used in multicasting to limit scope. The problem with TTL
- usage is that it does not take into account administrative
- boundaries.
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- o Scope should be based on the group address.
-
- o It was noted that the first 256 assigned multicast addresses are
- meant for local wire only.
-
- o Scott Brim, from Cornell, has proposed to provide scoping in IGMP.
-
- o Scoping boundaries should have multiple levels. For example,
- (Site, AS, Country, Continent).
-
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- Attendees
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- Jim Beers beers@nr-tech.cit.cornell.edu
- Scott Brim swb@nr-tech.cit.cornell.edu
- Chi Chu chi@sparta.com
- Richard Colella colella@osi3.ncsl.nist.gov
- Steve Deering deering@xerox.com
- Dino Farinacci dino@cisco.com
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- Dennis Ferguson dennis@canet.ca
- Robert Griffioen rgriff@bnr.ca
- Jeffrey Honig jch@nr-tech.cit.cornell.edu
- Phani Jujjavarapu phani@cisco.com
- April Merrill abmerri@tycho.ncsc.mil
- Greg Minshall minshall@wc.novell.com
- John Moy jmoy@proteon.com
- Karen O'Donoghue kodonog@relay.nswc.navy.mil
- Bob Stewart rlstewart@eng.xyplex.com
- David Waitzman djw@bbn.com
- Robert Woodburn woody@cseic.saic.com
- L. Michele Wright uncng!michele@uunet.uu.net
- Osmund de Souza desouza@osdpc.ho.att.com
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