CURRENT_MEETING_REPORT_ Reported by George Clapp/Ameritech IPLPDN Minutes Opening Remarks This was the third meeting of the IP over Large Public Data Networks Working Group. The following was the Agenda of the meeting: Monday, July 29, 1991 PM IP over Frame Relay Tuesday, July 30, 1991 AM IP over Frame Relay PM IP over Frame Relay Wednesday, July 31, 1991 AM Address Resolution and routing PM Address Resolution and routing Thursday, August 1, 1991 AM IP over ISDN Monday, July 29, Through Tuesday, July 30, 1991 After brief introductory remarks by the Chair, Andy Malis opened with a presentation giving an overview of the current status of encapsulation over Frame Relay (copies of the slides are included with these minutes). The Working Group then turned to a close review of the following three documents: o Multiprotocol Interconnect over Frame Relay Networks o Inverse Address Resolution Protocol o Management Information Base for Frame Relay DTEs (The revised documents are available as Internet Drafts entitled ``draft-ietf-iplpdn-ipoverframerelay-03.txt,'' ``draft-ietf-iplpdn-inarp-02.txt'', and ``draft-ietf-iplpdn-frmib-01.txt,'' respectively.) Prior to the meeting, email discussion of these documents had progressed to the point where there was general satisfaction with the contents, and this was the final review prior to submitting the drafts to the IAB for approval. There were some changes in content to the first document, ``Multiprotocol Interconnect over Frame Relay Networks.'' The group 1 agreed that the preferred method of indicating protocols other than IP was via a Network Layer Protocol ID (NLPID) value of 0x80 and SNAP. The option of indicating the Ethertype via an NLPID value of 0xCE was de-emphasized, and text describing this approach was moved to an appendix of the document. A second change to the document was the explicit depiction of the encoding of bridged MAC frames. This text was added to minimize the possibility of incompatible implementations. The two other documents were reviewed and adopted without significant modifications. Keith Mader asked the group to consider developing a protocol by which end points can negotiate configuration and service parameters over Frame Relay permanent virtual circuits (PVCs). Keith also asked whether the OUI/PID value of 0x00-80-C2 0x00-0E could be used to indicate this protocol. The group agreed to undertake this work with the caveat that the work should not be extended into the realm of signaling. Fred Baker suggested that a useful distinction between negotiation and signaling is that the former is between end stations and the latter is between an end station and the network. Keith offered to develop a baseline document which could accompany a request to the IEEE 802.1 Working Group for a PID value. By the end of Tuesday, July 30, the group was satisfied with the modified documents and agreed to submit them to the IAB for approval. Caralyn Brown was scheduled to give a presentation to the plenary on Wednesday evening describing the approach taken by the group. Wednesday, July 31, 1991 All of Wednesday was spent discussing address resolution across large public data networks, with an emphasis on SMDS. John Hagan of the University of Pennsylvania and John Garrett of AT&T Bell Laboratories presented a discussion of ``directed ARP,'' a technique in which ARP requests are sent to the source of routing information rather than broadcast to all participants in a Logical IP Subnetwork (LIS). ``Directed ARP'' brought into question a fundamental assumption of the Internet, which is that if the network portion of the IP addresses of two devices differ, then these devices are attached to different networks and can only communicate via an intermediary router. The group debated the benefits and costs of violating this assumption and ended by recognizing that the IPLPDN Working Group could not resolve this issue and that other Working Groups of the IETF should become involved. Paul Tsuchiya then presented a discussion of an alternative approach which makes use of BGP, and he expressed approval of the directed ARP technique. The group felt that a combination of directed ARP with an enhanced BGP may represent a solution to the address resolution and routing issues. Paul offered to work with John Hagan and John Garrett to investigate a synthesis of their approaches before the next IETF meeting. 2 Thursday Morning, August 1, 1991 Dory Leifer led a discussion of IP over circuit ISDN which focused on the relative merits of the Point-to-Point Protocol (PPP) and Frame Relay for use over the B channel. No resolution of reached, though members of the group volunteered to augment the Frame Relay approach with negotiation procedures, and the group agreed to discuss the topic again during the next meeting. As a final topic, the draft written by Robert Ullman for IP over X.25 was discussed. Andy Malis and George Clapp volunteered to contact Robert and to investigate the possibility of updating RFC 877 during the interim. In closing, the Chair congratulated the Working Group for a very productive meeting and thanked members for their hard work in drafting and revising the documents. The group then adjourned. Attendees Vikas Aggarwal vikas@JVNC.net Fred Baker fbaker@emerald.acc.com Tom Benkart teb@saturn.acc.com Arthur Berggreen art@acc.com Helen Bowns hbowns@bbn.com Caralyn Brown cbrown@wellfleet.com Carter Bullard carter@gatech.edu Eric Carroll eric@utcs.utoronto.ca Charles Carvalho charles@sage.acc.com Cho Chang chang_c@apollo.hp.com John Chang jrc@uswest.com Peter Chang tpc@mtunm.att.com Richard Cherry rcherry@novell.com George Clapp meritec!clapp@uunet.uu.net Richard Cogger rhx@cornellc.cit.cornell.edu Nabil Damouny nabil@tdd.sj.nec.com Jill Foster jill.foster@newcastle.ac.uk Stephen Gabe spgabe@bnr.ca John Garrett jwg@edsel.att.com Robert Griffioen rgriff@bnr.ca John Dotts Hagan hagan@dccs.upenn.edu Tony Hain alh@es.net Joel Halpern jmh@network.com Frank Heath heath@cmc.com B.V. Jagadeesh bvj@3com.com Manu Kaycee kaycee@trlian.enet.dec.com Tom Kessler kessler@sun.com Paulina Knibbe knibbe@cisco.com Joseph Lawrence jcl@sabre.bellcore.com John Leddy jleddy@ibm.com Dory Leifer Dory_Leifer@um.cc.umich.edu Chao-Yu Liang cliang@synoptics.com Daniel Long long@nic.near.net John Lynn lynn@ttcllcat.cit.cornell.edu 3 Shane MacPhillamy slm@netrix.com Keith Mader keith@python.eng.microcom.com Andrew Malis malis@bbn.com Allison Mankin mankin@gateway.mitre.org Bill Manning bmanning@rice.edu Bernie May bfm@houxa.att.com Chandy Nilakantan csn@3com.com Michael O'Dell mo@bellcore.com David O'Leary oleary@sura.net Philippe Park ppark@bbn.com Bradford Parker brad@cayman.com Radia Perlman perlman@radia.enet.dec.com James Philippou japhilippou@eng.xyplex.com David Piscitello dave@sabre.bellcore.com Lars Poulsen lars@cmc.com K.K. Ramakrishnan rama@kalvi.enet.dec.com James Rees rees@ifs.umich.edu Ron Roberts roberts@jessica.stanford.edu Frank Solensky solensky@clearpoint.com Wayne Staats staats@adm.csc.ncsu.edu Martha Steenstrup msteenst@bbn.com Osamu Takada takada@sdl.hitachi.co.jp Mike Truskowski truskowski@cisco.com Paul Tsuchiya tsuchiya@thumper.bellcore.com Chris Waters-Pierandozzi waters@jvnc.net L. Michele Wright uncng!michele@uunet.uu.net Wengyik Yeong yeongw@psi.com Chin Yuan cxyuan@pacbell.com 4