CURRENT_MEETING_REPORT_ Reported by Steve Deering/ Stanford Minutes: This was the second meeting of the Multicast OSPF Working Group. Steve Deering gave a short presentation on the cost and scaling aspects of IGMP (the Internet Group Management Protocol, specified in RFC-1112) and of link-state multicast routing as planned for OSPF. [See the accompanying slides.] John Moy presented an outline of the changes and additions required to the current OSPF specification, to support multicast routing. Discussion of his outline identified some new concerns and suggestions regarding: o support for multicast routing by only a subset of routers in an area and its effect on multicast vs. unicast reachability, selection of designated routers, etc. o duplicate multicast packets arising from the support of multiple IP subnets on a single physical network. o inter-area and inter-AS multicast routing approaches. It was also pointed out that we will have to come up with formal MIB definitions covering the additional state and configuration variables introduced for multicast routing. No one immediately volunteered for that job. Action Items John Moy to generate a draft of the multicast changes/additions to the OSPF specification. Next Meeting The Multicast OSPF Working Group will next meet in Vancouver, at the July/August IETF meeting. 1 ATTENDEES Steven Bruniges Duane Butler dmb@network.com George Clapp meritec!clapp@bellcore.bellcore.com Rob Coltun rcoltun@umds.umd.edu Steve Deering deering@pescadero.stanford.edu Martin Gross gross@polaris.dca.mil Keith Hogan keith%penril@uunet.uu.net Jeff Honig jch@tcgould.tn.cornell.edu Joseph C Lawrence jcl@sabre.bellcore.com Yoni Malachi yoni@cs.stanford.edu Tony Mason mason@transarc.com Jeff Mogul mogul@decwrl.dec.com John Moy jmoy@proteon.com Stephanie Price cmcvax!price@hub.ucsb.edu Jim Showalter gamma@mintaka.dca.mil Michael St. Johns stjohns@umd5.umd.edu Brad Strand bstrand@cray.com Kannan Varadhan kannan@oar.net Steven Willis swillis@wellfleet.com Chin Yuan cyuan@srv.pacbell.com 2