BGP SR Policy Extensions to Enable IFIT
draft-qin-idr-sr-policy-ifit-04

Document Type Active Internet-Draft (individual)
Authors Fengwei Qin  , Hang Yuan  , Tianran Zhou  , Giuseppe Fioccola  , Yali Wang 
Last updated 2020-10-02
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IDR                                                               F. Qin
Internet-Draft                                              China Mobile
Intended status: Standards Track                                 H. Yuan
Expires: April 5, 2021                                          UnionPay
                                                                 T. Zhou
                                                             G. Fioccola
                                                                 Y. Wang
                                                                  Huawei
                                                         October 2, 2020

                BGP SR Policy Extensions to Enable IFIT
                    draft-qin-idr-sr-policy-ifit-04

Abstract

   Segment Routing (SR) policy is a set of candidate SR paths consisting
   of one or more segment lists and necessary path attributes.  It
   enables instantiation of an ordered list of segments with a specific
   intent for traffic steering.  In-situ Flow Information Telemetry
   (IFIT) refers to network OAM data plane on-path telemetry techniques,
   in particular the most popular are In-situ OAM (IOAM) and Alternate
   Marking.  This document defines extensions to BGP to distribute SR
   policies carrying IFIT information.  So that IFIT methods can be
   enabled automatically when the SR policy is applied.

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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   This Internet-Draft will expire on April 5, 2021.

Qin, et al.               Expires April 5, 2021                 [Page 1]
Internet-Draft             bgp-sr-policy-ifit               October 2020

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Motivation  . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  IFIT methods for SR Policy  . . . . . . . . . . . . . . . . .   4
   4.  IFIT Attributes in SR Policy  . . . . . . . . . . . . . . . .   4
   5.  IFIT Attributes Sub-TLV . . . . . . . . . . . . . . . . . . .   5
     5.1.  IOAM Pre-allocated Trace Option Sub-TLV . . . . . . . . .   6
     5.2.  IOAM Incremental Trace Option Sub-TLV . . . . . . . . . .   7
     5.3.  IOAM Directly Export Option Sub-TLV . . . . . . . . . . .   8
     5.4.  IOAM Edge-to-Edge Option Sub-TLV  . . . . . . . . . . . .   9
     5.5.  Enhanced Alternate Marking (EAM) sub-TLV  . . . . . . . .   9
   6.  SR Policy Operations with IFIT Attributes . . . . . . . . . .  10
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  11
   9.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  11
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  12
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  12
     10.2.  Informative References . . . . . . . . . . . . . . . . .  13
   Appendix A. . . . . . . . . . . . . . . . . . . . . . . . . . . .  14
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  14

1.  Introduction

   Segment Routing (SR) policy [I-D.ietf-spring-segment-routing-policy]
   is a set of candidate SR paths consisting of one or more segment
   lists and necessary path attributes.  It enables instantiation of an
   ordered list of segments with a specific intent for traffic steering.

   In-situ Flow Information Telemetry (IFIT) denotes a family of flow-
   oriented on-path telemetry techniques (e.g.  IOAM, Alternate
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