DLEP IEEE 802.1Q Aware Credit Window Extension
draft-berger-manet-dlep-ether-credit-extension-05
Network Working Group D. Wiggins
Internet-Draft MIT Lincoln Laboratory
Intended status: Standards Track L. Berger
Expires: June 7, 2021 LabN Consulting, L.L.C.
December 4, 2020
DLEP IEEE 802.1Q Aware Credit Window Extension
draft-berger-manet-dlep-ether-credit-extension-05
Abstract
This document defines an extension to the Dynamic Link Exchange
Protocol (DLEP) that enables a Ethernet IEEE 802.1Q aware credit-
window scheme for destination-specific and shared flow control.
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Wiggins & Berger Expires June 7, 2021 [Page 1]
Internet-Draft DLEP Ethernet Credit Extension December 2020
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
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