Dynamic Link Exchange Protocol (DLEP)
draft-ietf-manet-dlep-18

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Mobile Ad hoc Networks Working Group                          S. Ratliff
Internet-Draft                                                VT iDirect
Intended status: Standards Track                                 S. Jury
Expires: August 7, 2016                                    Cisco Systems
                                                          D. Satterwhite
                                                                Broadcom
                                                               R. Taylor
                                                  Airbus Defence & Space
                                                                B. Berry
                                                        February 4, 2016

                 Dynamic Link Exchange Protocol (DLEP)
                        draft-ietf-manet-dlep-18

Abstract

   When routing devices rely on modems to effect communications over
   wireless links, they need timely and accurate knowledge of the
   characteristics of the link (speed, state, etc.) in order to make
   routing decisions.  In mobile or other environments where these
   characteristics change frequently, manual configurations or the
   inference of state through routing or transport protocols does not
   allow the router to make the best decisions.  A bidirectional, event-
   driven communication channel between the router and the modem is
   necessary.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on August 7, 2016.

Ratliff, et al.          Expires August 7, 2016                 [Page 1]
Internet-Draft    Dynamic Link Exchange Protocol (DLEP)    February 2016

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   document authors.  All rights reserved.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   4
     1.1.  Requirements  . . . . . . . . . . . . . . . . . . . . . .   7
   2.  Protocol Overview . . . . . . . . . . . . . . . . . . . . . .   7
     2.1.  Assumptions . . . . . . . . . . . . . . . . . . . . . . .   9
   3.  Destinations  . . . . . . . . . . . . . . . . . . . . . . . .   9
     3.1.  Router-requested Destinations . . . . . . . . . . . . . .  10
   4.  Metrics . . . . . . . . . . . . . . . . . . . . . . . . . . .  11
   5.  DLEP Session Flow . . . . . . . . . . . . . . . . . . . . . .  12
     5.1.  Peer Discovery State  . . . . . . . . . . . . . . . . . .  12
     5.2.  Session Initialization State  . . . . . . . . . . . . . .  14
     5.3.  In-Session State  . . . . . . . . . . . . . . . . . . . .  15
       5.3.1.  Heartbeats  . . . . . . . . . . . . . . . . . . . . .  16
     5.4.  Session Termination State . . . . . . . . . . . . . . . .  16
     5.5.  Session Reset state . . . . . . . . . . . . . . . . . . .  17
       5.5.1.  Unexpected TCP connection termination . . . . . . . .  17
   6.  Transaction Model . . . . . . . . . . . . . . . . . . . . . .  17
   7.  Extensions  . . . . . . . . . . . . . . . . . . . . . . . . .  18
     7.1.  Experiments . . . . . . . . . . . . . . . . . . . . . . .  18
   8.  Scalability . . . . . . . . . . . . . . . . . . . . . . . . .  19
   9.  DLEP Signal and Message Structure . . . . . . . . . . . . . .  19
     9.1.  DLEP Signal Header  . . . . . . . . . . . . . . . . . . .  20
     9.2.  DLEP Message Header . . . . . . . . . . . . . . . . . . .  20
     9.3.  DLEP Generic Data Item  . . . . . . . . . . . . . . . . .  21
   10. DLEP Signals and Messages . . . . . . . . . . . . . . . . . .  21
     10.1.  Peer Discovery Signal  . . . . . . . . . . . . . . . . .  22
     10.2.  Peer Offer Signal  . . . . . . . . . . . . . . . . . . .  23
     10.3.  Session Initialization Message . . . . . . . . . . . . .  23
     10.4.  Session Initialization Response Message  . . . . . . . .  24