Dynamic Link Exchange Protocol (DLEP)
RFC 8175

Document Type RFC - Proposed Standard (June 2017; No errata)
Last updated 2017-06-20
Replaces draft-sratliff-manet-dlep
Stream IETF
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Stream WG state Submitted to IESG for Publication
Document shepherd Justin Dean
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IESG IESG state RFC 8175 (Proposed Standard)
Consensus Boilerplate Yes
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Responsible AD Alvaro Retana
Send notices to aretana@cisco.com
IANA IANA review state Version Changed - Review Needed
IANA action state RFC-Ed-Ack
Internet Engineering Task Force (IETF)                        S. Ratliff
Request for Comments: 8175                                    VT iDirect
Category: Standards Track                                        S. Jury
ISSN: 2070-1721                                            Cisco Systems
                                                          D. Satterwhite
                                                                Broadcom
                                                               R. Taylor
                                                  Airbus Defence & Space
                                                                B. Berry
                                                               June 2017

                 Dynamic Link Exchange Protocol (DLEP)

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.  This document
   introduces a new protocol called the Dynamic Link Exchange Protocol
   (DLEP), which provides a bidirectional, event-driven communication
   channel between the router and the modem to facilitate communication
   of changing link characteristics.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc8175.

Ratliff, et al.              Standards Track                    [Page 1]
RFC 8175          Dynamic Link Exchange Protocol (DLEP)        June 2017

Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1. Introduction ....................................................4
   2. Protocol Overview ...............................................7
      2.1. Destinations ...............................................8
      2.2. Conventions and Terminology ................................9
   3. Requirements ....................................................9
   4. Implementation Scenarios .......................................10
   5. Assumptions ....................................................10
   6. Metrics ........................................................11
   7. DLEP Session Flow ..............................................12
      7.1. Peer Discovery State ......................................12
      7.2. Session Initialization State ..............................14
      7.3. In-Session State ..........................................14
           7.3.1. Heartbeats .........................................15
      7.4. Session Termination State .................................15
      7.5. Session Reset State .......................................16
           7.5.1. Unexpected TCP Connection Termination ..............16
   8. Transaction Model ..............................................16
   9. Extensions .....................................................17
      9.1. Experiments ...............................................18
   10. Scalability ...................................................18
   11. DLEP Signal and Message Structure .............................18
      11.1. DLEP Signal Header .......................................19
      11.2. DLEP Message Header ......................................20
      11.3. DLEP Generic Data Item ...................................20
   12. DLEP Signals and Messages .....................................21
      12.1. General Processing Rules .................................21
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