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pppext-iplpdn-minutes-93jul.txt
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CURRENT_MEETING_REPORT_
Reported by Fred Baker/ACC and George Clapp/Ameritech
Minutes of the joint session of IPLPDN and PPPEXT Working Groups
RFC 1356 X.25
RFC 1356 will be recommended as a Draft Standard. There have been six
to seven implementations with no interoperability problems.
RFC 1294 has already been recommended for advancement to Draft Standard.
Protocol Discrimination
A PPP NLPID has been requested by the PPPEXT Working Group for use in
NLPID-encapsulated protocols. The request has unfortunately gotten lost
in the mail. Bill Simpson will resend the request to Lyman Chapin, who
has agreed to make it happen. There is a separate issue with the ISDN
Lower Layer Compatibility Information Element; George Clapp will pursue
obtaining a value indicating PPP.
o IP/Circuit Switched Service
The question was seriously discussed whether we in fact need a
default way to send IP over circuit switched services such as ISDN
B channel. It was observed that the question is malformed; we do
not need a default way to send IP over a V.35 or V.11 interface,
for example. We need a way to speak to a peer system at the data
link layer, which might be a Frame Relay or X.25 switch, or a peer
host or router.
We already have standards for PPP, Frame Relay, and X.25. In
different contexts, we are willing to run any of the three
standards.
This approach is recommended for circuit switched services:
- Systems must implement PPP, on the assumption that circuit
switched communications are generally [host or router] to [host
or router].
- Systems may implement other protocols such as Frame Relay or
X.25
The implication here is not that all calls will be initiated with
PPP signaling and encapsulation, but that PPP signaling and
encapsulation will be a universally implemented option.
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Multi-link Protocol
The header will be changed to one of the following:
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|M|P|0|0| Sequence Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
o M - More - 1 if a non-terminal fragment, 0 if the last fragment
o P - Phase - has the same value on each fragment of a message,
inverts from message to message
o 0 - Reserved, must be zero
o Sequence Number - 0 to 4095 fragment sequence number
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|F|L|0|0| Sequence Number |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
o F - First - 1 if first fragment in a message
o L - Last - 1 if last fragment in a message
o 0 - Reserved, must be zero
o Sequence Number - 0 to 4095 fragment sequence number
Including a link in the multi-link group is done by authenticating
inclusion in the multi-link group and negotiation of the Fragmentation
Protocol Control Protocol (FPCP).
Removing a link from the multi-link group is done by terminating the
FPCP on that link.
In the worst case, receiver recovery from a sequence error (fragment
loss) is done by sending an FPCP Configure Request in the OPEN state on
all links; in most cases, one of the following two conditions is
sufficient to detect and step past the loss of a sequenced fragment:
1. Receipt of a frame on each link with a successor to the omitted
sequence number.
2. Expiration of an implementation-specific receipt timer; this should
be long enough to handle the relevant timing issues.
There is a separate LCP negotiation, authentication step, and set of
Control Protocol negotiations for each link in a multi-link group.
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Several other options were considered, including the use of the RFC 1294
fragmentation header, which was agreed to in the March meeting; RFC 1294
provides the same essential features as this but requires four octets,
and additionally provides only compatibility with RFC 1294.
PPP on Frame Relay
We need to have an Applicability Statement for PPP over Frame Relay, in
view of the existence of RFC 1294. The default encapsulation is as
described in the minutes of the March IETF. Various edits were
recommended, which will be included in an updated draft, including
collapsing of Keith Sklower's parameter negotiation document (with
attribution as author) into this document.
LQM should not be used on a Frame Relay DLCI.
PPP on X.25
We need to have an Applicability Statement for PPP over X.25 in view of
RFCs 877 and 1356. Various edits were recommended, which will be
included in an updated draft. Primary attention should be given to
reducing the size of the X.25 frame.
LQM should not be used in this environment.
The PPP NLPID SHOULD be placed in the call user data rather than being
carried in each frame.
PPP/ISDN
Bill Simpson presented his paper on PPP over ISDN.
PPP must have the same default MRU (and any other defaults) on ISDN as
in other environments. Keith Sklower will publish his IPLPDN document,
``Determination of Encapsulation of Multi-Protocol Datagrams in Circuit
Switched Environment,'' and Bill indicates that he would like to copy
some of the technical material from it into this document. It was
decided that he would reference Keith's document.
Parameter Negotiation
Keith and Bill will merge their documents. This document should be
separate from the PPP over foo documents, as it is desired to be placed
on the standards track, and the PPP over foo documents may not be placed
on that track.
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Attendees
George Abe abe@infonet.com
Nick Alfano alfano@mpr.ca
Bernt Allonen bal@tip.net
Frederik Andersen fha@dde.dk
Arun Arunkumar nak@3com.com
Cynthia Bagwell cbagwell@gateway.mitre.org
Fred Baker fbaker@acc.com
Per Bilse bilse@ic.dk
Carsten Bormann cabo@cs.tu-berlin.de
Rich Bowen rkb@ralvm11.vnet.ibm.com
Robert Braden braden@isi.edu
Caralyn Brown cbrown@wellfleet.com
Steve Buchko stevebu@newbridge.com
Les Clyne l.clyne@jnt.ac.uk
Thomas Cordetti tomc@digibd.com
Geert Jan de Groot geertj@ica.philips.nl
Marty Del Vecchio marty@shiva.com
Bob Downs bdowns@combinet.com
Ian Duncan id@cc.mcgill.ca
Toerless Eckert Toerless.Eckert@informatik.uni-erlangen.de
Kjeld Borch Egevang kbe@craycom.dk
Ed Ellesson ellesson@vnet.ibm.com
Shoji Fukutomi fuku@furukawa.co.jp
Eugene Geer ewg@cc.bellcore.com
David Ginsburg ginsb@us-es.sel.de
Marcel Graf graf%dhdibm1.bitnet@vm.gmd.de
Chris Gunner gunner@dsmail.lkg.dec.com
Joel Halpern jmh@network.com
Jari Hamalainen jah@rctre.nokia.com
Patrick Hanel hanel@yoyodyne.trs.ntc.nokia.com
Ken Hayward crm57d@bnr.ca
Gerd Holzhauer Holzhauer1@applelink.apple.com
John Hopkins J_Hopkins@icrf.icnet.uk
Chris Howard chris_howard@inmarsat.org
David Jacobson dnjake@vnet.ibm.com
Philip Jones p.jones@jnt.ac.uk
Frank Kastenholz kasten@ftp.com
Rajeev Kochhar rajeev_kochhar@3com.com
Dave Langley davel@hprnd.hp.com
Eliot Lear lear@sgi.com
Paolo Malara malara@crs4.it
Andrew Malis malis_a@timeplex.com
Shehzad Merchant merchant@erg.sri.com
Gerry Meyer gerry@spider.co.uk
William Miskovetz misko@cisco.com
Keith Mitchell keith@pipex.net
Daniel Myers dan@nsd.3com.com
Drew Perkins ddp@fore.com
David Piscitello dave@mail.bellcore.com
Lars Poulsen lars@cmc.com
Dave Rand dave_rand@novell.com
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Juergen Rauschenbach jrau@dfn.de
Tony Richards richards@icm1.icp.net
Benny Rodrig brodrig@rnd-gate.rad.co.il
Miguel Sanz miguel.sanz@rediris.es
Henk Sennema sennema@sara.nl
Keith Sklower sklower@cs.berkeley.edu
Timon Sloane timon@timon.com
Kenneth Smith kensmith@bnr.ca
Henk Steenman henk@sara.nl
Richard Sweatt rsweatt@synoptics.com
Antoine Trannoy trannoy@crs4.it
Hisao Uose uose@tnlab.ntt.jp
Rene van der Hauw rene@geveke.nl
Willem van der Scheun scheun@sara.nl
Ruediger Volk rv@informatik.uni-dortmund.de
Scott Wasson sgwasson@eng.xyplex.com
Kirk Williams kirk@sbctri.sbc.com
Rachel Willmer rachelw@spider.co.uk
Sam Wilson sam.wilson@ed.ac.uk
Paul Zawada Zawada@ncsa.uiuc.edu
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