BGP SR Policy Extensions for Virtual Transport Network
draft-dong-idr-sr-policy-vtn-00

Document Type Active Internet-Draft (individual)
Authors Jie Dong  , Zhibo Hu , Ran Pang 
Last updated 2020-10-30
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IDR Working Group                                                J. Dong
Internet-Draft                                                     Z. Hu
Intended status: Standards Track                     Huawei Technologies
Expires: May 3, 2021                                             R. Pang
                                                            China Unicom
                                                        October 30, 2020

         BGP SR Policy Extensions for Virtual Transport Network
                    draft-dong-idr-sr-policy-vtn-00

Abstract

   Segment Routing (SR) Policy is a set of candidate paths, each
   consisting of one or more segment lists and the associated
   information.  The header of a packet steered in an SR Policy is
   augmented with an ordered list of segments associated with that SR
   Policy.  In scenarios where multiple Virtual Transport Networks
   (VTNs) exist in the network, the VTN in which the SR policy is
   instantiated may also need to be specified, so that the header of
   packet can also be augmented with the information associated with the
   VTN.  An SR Policy candidate path can be distributed using BGP SR
   Policy.  This document defines extensions to BGP SR policy to specify
   the VTN associated with the SR policy.

Status of This Memo

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Copyright Notice

   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Dong, et al.               Expires May 3, 2021                  [Page 1]
Internet-Draft            BGP SR Policy for VTN             October 2020

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   (https://trustee.ietf.org/license-info) in effect on the date of
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Specification of Requirements . . . . . . . . . . . . . . . .   3
   3.  VTN Information Encoding in SR Policy . . . . . . . . . . . .   3
   4.  Procedures  . . . . . . . . . . . . . . . . . . . . . . . . .   4
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   7.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   5
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   5
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   The concept of Segment Routing (SR) policy is defined in
   [I-D.ietf-spring-segment-routing-policy].  An SR Policy is a set of
   candidate paths, each consisting of one or more segment lists.  The
   head end of an SR Policy may learn multiple candidate paths for an SR
   Policy.  The header of a packet steered in an SR Policy is augmented
   with an ordered list of segments associated with that SR Policy.  The
   BGP extensions to distribute SR Policy candidate paths is defined in
   [I-D.ietf-idr-segment-routing-te-policy].

   The concept of Virtual Transport Network (VTN) is introduced in
   [I-D.ietf-teas-enhanced-vpn].  A VTN is a virtual underlay network
   which has customized network topology and a set of dedicated or
   shared network resources.  In a network, different VTNs may be
   created to meet different service requirements, and different
   services can be mapped to different VTNs.

   In scenarios where multiple virtual networks (VTNs) exist in the
   network, the identifier of VTN in which the SR policy is instantiated
   may also need to be specified, so that the header of data packet can
   also be augmented with the information of the associated VTN.  This
   document defines the BGP extensions to specify the VTN ID associated
   with a candidate path of SR policy.
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