Dynamic Link Exchange Protocol (DLEP) Multi-Hop Forwarding Extension
RFC 8629

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Internet Engineering Task Force (IETF)                          B. Cheng
Request for Comments: 8629                        MIT Lincoln Laboratory
Category: Standards Track                                 L. Berger, Ed.
ISSN: 2070-1721                                  LabN Consulting, L.L.C.
                                                               July 2019

  Dynamic Link Exchange Protocol (DLEP) Multi-Hop Forwarding Extension

Abstract

   This document defines an extension to the Dynamic Link Exchange
   Protocol (DLEP) that enables the reporting and control of multi-hop
   forwarding by DLEP-capable modems.

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
   https://www.rfc-editor.org/info/rfc8629.

Copyright Notice

   Copyright (c) 2019 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
   (https://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.

Cheng & Berger               Standards Track                    [Page 1]
RFC 8629                DLEP Multi-Hop Extension               July 2019

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Key Words . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Extension Usage and Identification  . . . . . . . . . . . . .   3
   3.  Extension Data Items  . . . . . . . . . . . . . . . . . . . .   3
     3.1.  Hop Count . . . . . . . . . . . . . . . . . . . . . . . .   3
     3.2.  Hop Control . . . . . . . . . . . . . . . . . . . . . . .   5
       3.2.1.  Reset . . . . . . . . . . . . . . . . . . . . . . . .   6
       3.2.2.  Terminate . . . . . . . . . . . . . . . . . . . . . .   7
       3.2.3.  Direct Connection . . . . . . . . . . . . . . . . . .   7
       3.2.4.  Suppress Forwarding . . . . . . . . . . . . . . . . .   7
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
     5.1.  Extension Type Value  . . . . . . . . . . . . . . . . . .   8
     5.2.  Data Item Values  . . . . . . . . . . . . . . . . . . . .   9
     5.3.  Hop Control Actions Registry  . . . . . . . . . . . . . .   9
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  10
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .  10
     6.2.  Informative References  . . . . . . . . . . . . . . . . .  10
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .  10
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction

   The Dynamic Link Exchange Protocol (DLEP) is defined in [RFC8175].
   It provides the exchange of link-related control information between
   a modem and a router.  DLEP defines a base set of mechanisms as well
   as support for possible extensions.  This document defines one such
   extension.

   Some modem technologies support mobile ad hoc network (MANET)
   forwarding where connectivity to destinations is provided via
   forwarding in intermediate modems.  This document refers to
   forwarding by intermediate modems as "multi-hop forwarding".  DLEP
   Destination Messages can be used to report such reachable
   destinations (see [RFC8175]), but do not provide any information
   related to the number or capacity of the hops.  The extension defined
   in this document enables modems to inform routers when multi-hop
   forwarding is being used and allows routers to request that modems
   change multi-hop forwarding behavior.  The extension defined in this
   document is referred to as "Multi-Hop Forwarding", where each modem
   that transmits/sends data to reach a particular destination is
   counted as a hop.

   It is important to note that the use of the Hop Control mechanism
   defined in this document can result in connectivity changes and even
   loss of the ability to reach one or more destinations.  The defined

Cheng & Berger               Standards Track                    [Page 2]
RFC 8629                DLEP Multi-Hop Extension               July 2019