MPLS-LSP Data Plane for Cyclic Queuing and Forwarding
draft-chen-mpls-cqf-lsp-dp-00

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Last updated 2019-03-09
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Network Working Group                                            Z. Chen
Internet-Draft                                                  L. Qiang
Intended status: Informational                                    Huawei
Expires: September 10, 2019                                March 9, 2019

         MPLS-LSP Data Plane for Cyclic Queuing and Forwarding
                     draft-chen-mpls-cqf-lsp-dp-00

Abstract

   Large-scale Deterministic Network (LDN) [ldn] aims to achieve bounded
   latency forwarding on layer-3 networks that contain long-distance
   links, large number of nodes and flows.  LDN requires a data plane
   mechanism to indicate different forwarding cycles in the upstream
   node.  This document proposes to use multiple MPLS labels to indicate
   this kind of information, for MPLS-LSP data plane.

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

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   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

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Table of Contents

   1.  Introduction (LDN Background) . . . . . . . . . . . . . . . .   2
   2.  MPLS-LSP Data Plane for CQF . . . . . . . . . . . . . . . . .   3
   3.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   5.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   4
   6.  Normative References  . . . . . . . . . . . . . . . . . . . .   4
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Introduction (LDN Background)

   Large-scale Deterministic Network (LDN) [ldn] aims to achieve bounded
   latency forwarding on layer-3 networks that contain long-distance
   links, large number of nodes and flows.  Figure 1 illustrates the
   basic mechanism of LDN, where an upstream Node A and a downstream
   Node B are considered.  Each interface of a LDN router has three
   cyclic scheduled queues, i.e., at any given time (or cycle), one of
   the queues is sending packets and the others are receiving.

           |  cycle x  | cycle x+1 |
    Node A +-----------+-----------+
                       \
                        \packet
                         \receiving
                          \
                  |        V  |  cycle y+1|
       Node B     +-----------+-----------+
                     cycle y      \packets
                                   \sending
                                    \
                                     \
                                      V

                   Figure 1

   In order to achieve end-to-end bounded latency, LDN requires that all
   packets sent from the upstream router in a specific cycle MUST be
   sent by the downstream router within another (one) specific cycle.

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   For example, as shown in Figure 1, the packets sent by Node A within
   cycle x MUST be put into single receiving queue in Node B, and then
   be sent out within cycle y+1.  The mapping relationship between x and
   y+1 could be configured by a centralized controller, or be self-
   learned by each peer of neighbors at the data plane.

   Therefore, LDN requires a data plane mechanism to indicate which
   upstream node's cycle a packet belongs to, so that the downstream
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