DLEP IEEE 802.1Q Aware Credit Window Extension
draft-berger-manet-dlep-ether-credit-extension-02

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Network Working Group                                         D. Wiggins
Internet-Draft                                    MIT Lincoln Laboratory
Intended status: Standards Track                               L. Berger
Expires: September 7, 2019                       LabN Consulting, L.L.C.
                                                           March 6, 2019

             DLEP IEEE 802.1Q Aware Credit Window Extension
           draft-berger-manet-dlep-ether-credit-extension-02

Abstract

   This document defines an extension to the DLEP protocol that enables
   a Ethernet IEEE 802.1Q aware credit-window scheme for destination-
   specific and shared flow control.

Status of This Memo

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   This Internet-Draft will expire on September 7, 2019.

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Wiggins & Berger        Expires September 7, 2019               [Page 1]
Internet-Draft       DLEP Ethernet Credit Extension           March 2019

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Key Words . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Extension Usage and Identification  . . . . . . . . . . . . .   3
   3.  Management Considerations . . . . . . . . . . . . . . . . . .   3
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
     5.1.  Extension Type Value  . . . . . . . . . . . . . . . . . .   4
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   5
     6.2.  Informative References  . . . . . . . . . . . . . . . . .   5
   Appendix A.  Acknowledgments  . . . . . . . . . . . . . . . . . .   6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   6

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.  This document defines one such extension.

   The base DLEP specification does not include any flow control
   capability.  There are various flow control techniques theoretically
   possible with DLEP.  This document defines a DLEP extension which
   provides an Ethernet-based flow control mechanism for traffic sent
   from a router to a modem.  Flow control is provided using one or more
   logical "Credit Windows", each of which will typically be supported
   by an associated virtual or physical queue.  Traffic sent by a router
   will use traffic flow classification information provided by the
   modem to identify which traffic is associated with each credit
   window.  Credit windows may be shared or dedicated on a per flow
   basis.  See [I-D.ietf-manet-dlep-da-credit-extension] for a DiffServ-
   based version of credit window flow control.

   This document uses the traffic classification and credit window
   control mechanisms defined in
   [I-D.ietf-manet-dlep-traffic-classification] and
   [I-D.ietf-manet-dlep-credit-flow-control] to provided credit window
   based flow control based on on DLEP destination and Ethernet VLANs
   and Priority Code Points.  Ethernet Priority Code Point support is
   defined as part of the IEEE 802.1Q [IEEE.802.1Q_2014] tag format and
   includes a 3 bit "PCP" field.  The tag format also includes a 12 bit
   VLAN identifier (VID) field.  The defined mechanism allows for credit
   windows to be shared across traffic sent to multiple DLEP
   destinations VLANs, and PCPs, or used exclusively for traffic sent to