Inter-domain Network Slicing via BGP-LU
draft-zhou-idr-inter-domain-lcu-01

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IDR Working Group                                                J. Zhou
Internet-Draft                                             Chunning. Dai
Intended status: Standards Track                            Shaofu. Peng
Expires: August 21, 2020                                       ZTE Corp.
                                                            Feb 18, 2020

                Inter-domain Network Slicing via BGP-LU
                   draft-zhou-idr-inter-domain-lcu-01

Abstract

   This document aims to solve inter-domain network slicing problems
   using existing technologies.  It attempts to establish multiple BGP-
   LU LSPs of different colors for a prefix to stitch multiple network
   segments.

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   This Internet-Draft will expire on August 21, 2020.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Requirements notation . . . . . . . . . . . . . . . . . . . .   2
   3.  Color . . . . . . . . . . . . . . . . . . . . . . . . . . . .   2
   4.  Advertising multiple paths  . . . . . . . . . . . . . . . . .   3
   5.  Assigning Label(s)  . . . . . . . . . . . . . . . . . . . . .   4
   6.  Establishing BGP-LU LSPs  . . . . . . . . . . . . . . . . . .   4
   7.  Deploy Considerations . . . . . . . . . . . . . . . . . . . .   6
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     9.2.  Informative References  . . . . . . . . . . . . . . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   As described in [I-D.peng-teas-network-slicing], in the traditional
   end to end inter-domain network slicing, BGP-LU is used as a
   distributed slicing scheme.  [RFC8277] specifies a set of procedures
   for using BGP to advertise that a specified router has bound a
   specified MPLS label to a specified address prefix.  It's an
   effective way for inter-domain labels, but it does not have the
   ability to select the underlying network resources.

   This document describes the colored BGP-LU LSP, in which the routing
   prefix not only carries a label(or a sequence of labels), but also
   carries an unique color attribute which helps to select the
   underlying logic slice.

   [RFC7911] defines a BGP extension that allows the advertisement of
   multiple paths of the same address prefix.  It can help with optimal
   routing and in a network by providing potential alternate or backup
   paths.  In this document, it is not used for the link backup.  It is
   only used to advertise multiple paths, whether intra-domain or inter-
   domain.

2.  Requirements notation

   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 [RFC2119].

3.  Color

   [I-D.ietf-idr-tunnel-encaps] introduces the concept of color, which
   is used as one of the KEY of SR policy
   [I-D.ietf-spring-segment-routing-policy].  The color of SR policy

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   defines a TE purpose, which includes a set of constraints such as
   bandwidth, delay, TE metric, etc.

   Color is used a policy keyword to help routing decisions and can be