CURRENT_MEETING_REPORT_ Reported by Bob Hinden/Sun Minutes of the IP over Asynchronous Transfer Mode Working Group (ATM) Agenda o Overview of ATM Forum Addressing Work, Keith McCloghrie o Address Resolution in ATM Networks, Subbu Subramaniam o Architecture, Address Translation, and Call Control, Fong-Ching Liaw o NBMA Address Resolution Protocol (NBMA ARP), Juha Heinanen o General Discussion of ATM Address Resolution o Issues in the Interconnection of LANs and ATM Networks, Tim Salo The IP over Working Group meet for three sessions at the March IETF meeting. Over 129 people attended the Working Group sessions. The first session consisted of four presentations on ATM addressing and ATM/Internet address resolution. Keith McCloghrie presented an overview of the ATM Forum addressing work. Subbu Subramaniam presented his ideas on how ATM address resolution should work. Fong-Ching Liaw Presented pros and cons of Subnet and Peer model of address resolution in ATM networks and Juha Heinanen presented an overview of his NBMA Address Resolution Protocol (NBMA ARP) proposal. There was considerable discussion about how address resolution should work, and the pros and cons of the subnet vs. peer model. There were strong views on both sides. Subnet model is a conventual internet model where each network has it own addressing, and internetworking routing and addressing runs on top of this. In the peer model the ATM network is knowledgeable about and participates in Internet routing. Call connection (signaling) requests would use internet address to specify destination. The session ended with the suggestion that neither one approach would prevail and that there should be proposed mechanisms for combining the two approaches. Mark Leabach presented slides with his thoughts on which areas the Working Group should focus on first. He saw two approaches in the Working Group: Functional layerists (ATM as a wire-replacement) vs. ATM IP Morph'ist. He made a strong argument that the Working Group should first specify how IP over ATM should work in the ``classical IP'' mode where ATM networks are connected by routers. He presented the following problems which need to be solved: o IP Encapsulation in ATM (Done). o How to ``Roll your own'' wires over ATM between IP elements in the 1 Network. o How to Dynamically find other IP hosts on an ATM LAN. o How to do connection-less service. o Knowing that you have an all ATM path between IP elements, what optimizations can be made? o Authentication VC Call Setup. o Management Tools such as Trace route. o Resource Setup/QOS. o IP Multicast to ATM Multicast. Tim Salo presented a talk on the Gigabit Testbed Talk. The goal of the project is to create a seamless connection between ATM LAN's and ATM WAN's. His preliminary observations were that there are no complete proposals available today, some ares only slightly explored or identified, much new functionality must be implemented, and most of the problems are in the wide area. He grouped issues into several problem areas: o ATM Address Assignment o IP Address Assignment o Address resolution o IP over ATM Internets o IP route optimization o Locality (IP only talks to local entities) His final observations were that we need a complete solution if ATM is going to be the solution. It is important to avoid making the customer the system integrator. Significantly more implementation experience is needed. Ramon Caceres presented the results of his simulation of different approaches for VC multiplexing. His conclusions were that one VC per connection gives the best performance, followed by one VC per type of traffic (e.g., telnet, ftp, mail, etc.). One VC per router pair gives poor performance. The overall goal should be to separate traffic as much as possible After a final discussion of subnet vs. peer addressing models, the Working Group agreed that the following issues were important to pursue: o Focus on Subnet model first. Work on the peer model should 2 continue, but it is important to develop a solution for the subnet model first. o Prefer strongly typed addresses with peer model vs. mechanical address translation o Simulation of Subnet model is important. Need to look at performance issues based on data for real IP traffic. o ARP Servers will need mechanisms for updating and synchronizing databases. o Charging is an issue with ARP servers. o Auto configuration and discovery of ARP servers necessary. Action Items The following actions items were assigned: Steve Willis: Write contribution to be submitted to the ATM forum on encapsulation (LLC) negotiation. Due in 1 Week. Mark Leabach: Write a framework document describing the using ATM in the Classical IP Model (i.e., ATM networks connected by routers). Due prior to next IETF Meeting. Robert Cole: Write a framework document describing the using ATM in the End-End Model (i.e., seamless ATM from initial source to final destination). Due prior to next IETF Meeting. Juha Heinanen: Complete draft on NBMA Address Resolution. Will include both General Media Independent specification and ATM specific usage guidelines. Due prior to next IETF Meeting. Bob Hinden: Develop a list of IPoverATM Issues. Due in May. Attendees Masuma Ahmed mxa@sabre.bellcore.com Robert Aiken aiken@es.net N. Akiko Aizawa akiko@nacsis.ac.jp Kannan Alagappan kannan@dsmail.lkg.dec.com David Arneson arneson@ctron.com Fred Baker fbaker@acc.com 3 Serpil Bayraktar sbb@noc.ans.net Nutan Behki Nutan_Behki@qmail.newbridge.com Tom Benkart teb@acc.com Lou Berger lberger@bbn.com B. Sue Blair bsb@noc.ans.net John Boatright bryan_boatright@ksc.nasa.gov Rich Bowen rkb@ralvm11.vnet.ibm.com Deborah Boyer djb@noc.ans.net Monroe Bridges monroe@cup.hp.com Thomas Brisco brisco@pilot.njin.net Caralyn Brown cbrown@wellfleet.com Theodore Brunner tob@thumper.bellcore.com Randy Butler rbutler@ncsa.uiuc.edu Ramon Caceres ramon@mitl.com Ross Callon rcallon@wellfleet.com Jeff Carman tcarman@bnr.ca John Chang jrc@uswest.com Yee-Hsiang Chang yhc@hpl.hp.com Anthony Chow chow_a@wwtc.timeplex.com Thomas Christie tfc@aa.ans.net George Clapp clapp@ameris.center.il.ameritech.com Richard Cogger R.Cogger@cornell.edu Robert Cole rgc@qsun.att.com Michael Collins collinsms@es.net Rob Coltun rcoltun@ni.umd.edu Tracy Cox tacox@sabre.bellcore.com Dave Cullerot cullerot@ctron.com Brent Curtiss bcurtiss@magnuss.ocs.ohio-state.edu James Davin davin@thumper.bellcore.com Shane Dawalt sdawalt@desire.wright.edu Steve DeJarnett steve@ibmpa.awdpa.ibm.com Osmund DeSouza osmund.desouza@att.com M.J. Dixon mjd@att.com Kurt Dobbins kurtdob@ctron.com Bob Downs bdowns@combinet.com Kishan Dudkikar kishan@icm1.icp.net Ed Ellesson ellesson@vnet.ibm.com Chip Elliott celliot@bbn.com Robert Enger enger@reston.ans.net Michael Fidler fidler@mitre.org Francois Fluckiger fluckiger@vxcern.cern.ch Craig Fox foxcj@network.com Karen Frisa karen.frisa@andrew.cmu.edu Dan Frommer dan@jeremy.enet.dec.com John Gawf gawf@compatible.com Eugene Geer ewg@cc.bellcore.com Kenneth Giusti kgiusti.chipcom.com Joseph Godsil jgodsil@ncsa.uiuc.edu Mike Goguen goguen@synoptics.com Daniel Grossman dan@merlin.dev.cdx.mot.com Chris Gunner gunner@dsmail.enet.dec.com Tony Hain alh@es.net Joel Halpern jmh@network.com Patrick Hanel hanel@yoyodyne.trs.ntc.nokia.com 4 Danny Hanson hanson.tic@commlan.safb.af.mil Eugene Hastings hastings@psc.edu Ken Hayward Ken.Hayward@bnr.ca Frank Heath heath@cmc.com Roland Hedberg Roland.Hedberg@rc.tudelft.nl John Heimaster jwh@mps.ohio-state.edu Juha Heinanen juha.heinanen@datanet.tele.fi Robert Hinden hinden@eng.sun.com Don Hofacker hofacker@dtedi.hq.aelc.af.mil Don Hoffman hoffman@eng.sun.com Frank Hoffmann hoffmann@dhdibm1.bitnet John Hopprich hopprich@davidsys.com Kathy Huber khuber@bbn.com Phil Irey pirey@relay.nswc.navy.mil Keisuke Ito itoh@msen.com David Jacobson dnjake@vnet.ibm.com David Johnson dbj@cs.cmu.edu Merike Kaeo merike@alw.nih.gov Kenneth Key key@cs.utk.edu Glenn Kime itoh@msen.com Charley Kline cvk@uiuc.edu Stev Knowles stev@ftp.com Lakshman Krishnamurthy lakashman@ms.uky.edu Giri Kuthethoor giri@ms.uky.edu Mark Laubach laubach@hpl.hp.com Fong-Ching Liaw fong@eng.sun.com Yu-Lin Lu yulin@hpinddu.cup.hp.com Paul Lustgraaf grpjl@iastate.edu Charles Lynn clynn@bbn.com Carl Madison carl@startek.com Jamshid Mahdavi Mahdavi@a.psi.edu James Mahon mahonj@honfsi1.att.com Andrew Malis malis_a@timeplex.com Tracy Mallory tracym@3com.com Allison Mankin mankin@cmf.nrl.navy.mil Michael Marcinkevicz mdm@csu.net Cynthia Martin martin@spica.disa.mil Jerry Martin jerry+@osu.edu Matt Mathis mathis@a.psc.edu Jun Matsukata jm@eng.isas.ac.jp Keith McCloghrie kzm@hls.com Donald Merritt Don@brl.mil David Meyer meyer@ns.uoregon.edu Gerry Meyer gerry@spider.co.uk James Miner jjm@fibercom.com Robert Mines rfm@sandia.llnl.gov Greg Minshall minshall@wc.novell.com Matthew Morrisey morrisey@wpsp01.hq.aflc.af.mil Judy Nasar jdnasar@magnus.acs.ohio-state.edu Steve Neruda neruda@morningstar.com Tom Nisbet nisbet@tt.com David O'Leary doleary@cisco.com Zbigniew Opalka zopalka@agile.com Ayal Opher aopher@synoptics.com 5 Joe Pagan jrp@afterlife.ncsc.mil Laura Pate pate@gateway.mitre.org Maryann Perez perez@cmf.nrl.navy.mil Drew Perkins ddp@fore.com Radia Perlman perlman@dsmail.enet.dec.com Roy Perry rperry@advtech.uswest.com James Philippou japhilippou@eng.xyplex.com David Piscitello dave@mail.bellcore.com Narendra Popat albin@frontier.com Dave Rand dave_rand@novell.com Venkat Rangan venkat@.metrix.com David Reese dave@csu.net Bradley Rhoades bdrhoades@mail.mmmg.com Tony Richards richards@icm1.icp.net Michael Roberts mmr@drwin.ptvy.ca.us Ben Robinson ben_robinson@vnet.ibm.com Kenneth Rodemann krr@qsun.att.com Benny Rodrig 4373580@mcimail.com Steve Romig romig@cis.ohio-state.edu Shawn Routhier sar@epilogue.com Timothy Salo tjs@msc.edu Hal Sandick sandick@vnet.ibm.com Vilson Sarto vilson@fapq.fapesp.br Shiva Sawant shiva@synoptics.com Andrew Schmidt ags@uius.edu Tim Seaver tas@concert.net Paul Serice serice@cos.com Kanan Shah kshag@cmf.nrl.navy.mil Karen Shay kshay@cs.cmu.edu Allyson Showalter allyson@nsipo.arc.nasa.gov Keith Sklower sklower@cs.berkeley.edu Andrew Smith asmith@synoptics.com Marco Sosa mxs@sabre.bellcore.com Roxanne Streeter streeter@nsipo.arc.nasa.gov Richard Stuart dickstuart@attmail.com Subbu Subramaniam subbu@cup.hp.com Terry Sullivan terrys@newbridge.com Wayne Tackabury wayne@cayman.com Sally Tarquinio sallyt@gateway.mitre.org John Tavs tavs@vnet.ibm.com Kaj Tesink kaj@cc.bellcore.com Kamlesh Tewani ktt@arch2.att.com Susan Thomson set@bellcore.com Marek Tomaszewski marek@net.com Mario Vecchi mpv@thumper.bellcore.com Huyen Vu vu@polaris.disa.mil Chuck Warlick warlick@theophilis.nsfc.nasa.gov Scott Wasson sgwasson@eng.xyplex.com Jack Waters waters@sura.net James Watt james@newbridge.com Von Welch vwelch@ncsa.uiuc.edu Rick Wilder wilder@ans.net Kirk Williams kirk@sbctri.sbc.com Steven Willis steve@wellfleet.com 6 Walter Wimer walter.wimer@andrew.cmu.edu Linda Winkler lwinkler@anl.gov Richard Woundy rwoundy@vnet.ibm.com Liang Wu ltw99@bellcore.com Yow-Wei Yao yao@chang.austin.ibm.com Chin Yuan cxyuan@pacbell.com Paul Zawada Zawada@ncsa.uiuc.edu 7