DLEP Credit-Based Flow Control Messages and Data Items
draft-ietf-manet-dlep-credit-flow-control-05

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Network Working Group                                           B. Cheng
Internet-Draft                                                D. Wiggins
Intended status: Standards Track                  MIT Lincoln Laboratory
Expires: May 22, 2020                                          L. Berger
                                                 LabN Consulting, L.L.C.
                                                              S. Ratliff
                                                       November 19, 2019

         DLEP Credit-Based Flow Control Messages and Data Items
              draft-ietf-manet-dlep-credit-flow-control-05

Abstract

   This document defines new Dynamic Link Exchange Protocol (DLEP) Data
   Items that are used to support credit-based flow control.  Credit
   window control is used to regulate when data may be sent to an
   associated virtual or physical queue.  The Data Items are defined in
   an extensible and reusable fashion.  Their use will be mandated in
   other documents defining specific DLEP extensions.

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
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   Drafts is at https://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 May 22, 2020.

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

Cheng, et al.             Expires May 22, 2020                  [Page 1]
Internet-Draft       DLEP Credit-Based Flow Control        November 2019

   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  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Key Words . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Credit Window Control . . . . . . . . . . . . . . . . . . . .   3
     2.1.  Data Plane Considerations . . . . . . . . . . . . . . . .   5
     2.2.  Credit Window Messages  . . . . . . . . . . . . . . . . .   5
       2.2.1.  Credit Control Message  . . . . . . . . . . . . . . .   5
       2.2.2.  Credit Control Response Message . . . . . . . . . . .   6
     2.3.  Credit Window Control Data Items  . . . . . . . . . . . .   7
       2.3.1.  Credit Window Initialization  . . . . . . . . . . . .   7
       2.3.2.  Credit Window Associate . . . . . . . . . . . . . . .   9
       2.3.3.  Credit Window Grant . . . . . . . . . . . . . . . . .  10
       2.3.4.  Credit Window Status  . . . . . . . . . . . . . . . .  12
       2.3.5.  Credit Window Request . . . . . . . . . . . . . . . .  13
     2.4.  Management Considerations . . . . . . . . . . . . . . . .  14
   3.  Compatibility . . . . . . . . . . . . . . . . . . . . . . . .  14
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .  15
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  15
     5.1.  Message Values  . . . . . . . . . . . . . . . . . . . . .  15
     5.2.  Data Item Values  . . . . . . . . . . . . . . . . . . . .  15
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  16
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .  16
     6.2.  Informative References  . . . . . . . . . . . . . . . . .  16
   Appendix A.  Acknowledgments  . . . . . . . . . . . . . . . . . .  17
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  17

1.  Introduction

   The Dynamic Link Exchange Protocol (DLEP) is defined in [RFC8175].
   It provides the exchange of link related control information between
   DLEP peers.  DLEP peers are comprised of a modem and a router.  DLEP
   defines a base set of mechanisms as well as support for possible
   extensions.  DLEP defines Data Items which are sets of information
   that can be reused in DLEP messaging.  The base DLEP specification
   does not include any flow identification beyond DLEP endpoints or
   flow control capability.  There are various flow control techniques
   theoretically possible with DLEP.  For example, a credit-window