SRv6 Based Bounded Latency
draft-geng-srv6-based-bounded-latency-00

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Network Working Group                                            X. Geng
Internet-Draft                                                   M. Mach
Intended status: Experimental                                     Huawei
Expires: November 8, 2019                                    May 7, 2019

                       SRv6 Based Bounded Latency
                draft-geng-srv6-based-bounded-latency-00

Abstract

   One of the goals of DetNet is to provide bounded end-to-end latency
   for critical flows.  This document defines how to leverage Segment
   Routing over IPv6 (SRv6) to implement bounded latency.  Specifically,
   new SRv6 SID function is used to specify transmission time (cycles)
   of a packet.  When forwarding devices along the path follow the
   instructions carried in the packet, the bounded latency is achieved.
   This mechanism of latency guarantee is called Cycle Specified Queuing
   and Forwarding (CSQF) which is defined in
   [I-D.chen-detnet-sr-based-bounded-latency].

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].

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
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   This Internet-Draft will expire on November 8, 2019.

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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.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology and Conventions . . . . . . . . . . . . . . . . .   3
     2.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
     2.2.  Conventions . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  SRv6 DetNet Data Plane Overview . . . . . . . . . . . . . . .   4
     3.1.  Encapsulation . . . . . . . . . . . . . . . . . . . . . .   4
     3.2.  Functions . . . . . . . . . . . . . . . . . . . . . . . .   5
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   6
   7.  Normative References  . . . . . . . . . . . . . . . . . . . .   6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   Deterministic Networking(DetNet) provides a capability to carry
   specified data flows with extremely low data loss rates and bounded
   latency within a network domain.  DetNet is enabled by a group of
   technologies, such as resource allocation, service protection and
   explicit routes.([I-D.ietf-detnet-architecture])

   Segment Routing(SR) leverages the source routing paradigm.  A ingress
   node steers a packet through an ordered list of instructions, called
   "segments".  SR can be applied over IPv6 data plane using Routing
   Extension Header(SRH).  Besides routing, the segment of SRv6 can
   indicate functions which are executed locally in the node where they
   are defined.  SRv6 network programming makes it convenient to add
   sophisticated operations in the network.  ([RFC8402])

   This document describes how to implement DetNet with SRv6.  It can
   provide : 1.  Source routing, which can steer the DetNet flows go

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   through the network according to an explicit route with allocated
   resource by segment list in SRH; 2.  Network programming, which can
   give packet instructions in every node along the path to guarantee
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