Seamless Segment Routing
draft-hegde-spring-mpls-seamless-sr-02

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Last updated 2020-09-21
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SPRING                                                          S. Hegde
Internet-Draft                                                 C. Bowers
Intended status: Standards Track                   Juniper Networks Inc.
Expires: March 25, 2021                                            X. Xu
                                                            Alibaba Inc.
                                                                A. Gulko
                                                               Refinitiv
                                                             A. Bogdanov
                                                             Google Inc.
                                                               J. Uttaro
                                                                     ATT
                                                                L. Jalil
                                                                 Verizon
                                                      September 21, 2020

                        Seamless Segment Routing
                 draft-hegde-spring-mpls-seamless-sr-02

Abstract

   In order to operate networks with large numbers of devices, network
   operators organize networks into multiple smaller network domains.
   Each network domain typically runs an IGP which has complete
   visibility within its own domain, but limited visibility outside of
   its domain.  Seamless Segment Routing (Seamless SR) provides
   flexible, scalable and reliable end-to-end connectivity for services
   across independent network domains.  Seamless SR accommodates domains
   using SR, LDP, and RSVP for MPLS label distribution as well as
   domains running IP without MPLS (IP-Fabric).

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
   Task Force (IETF).  Note that other groups may also distribute
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   Drafts is at https://datatracker.ietf.org/drafts/current/.

Hegde, et al.            Expires March 25, 2021                 [Page 1]
Internet-Draft          Seamless Segment Routing          September 2020

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
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   This Internet-Draft will expire on March 25, 2021.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Use Cases . . . . . . . . . . . . . . . . . . . . . . . . . .   5
     3.1.  Service provider network  . . . . . . . . . . . . . . . .   5
     3.2.  Large scale WAN networks  . . . . . . . . . . . . . . . .   7
     3.3.  Data Center Interconnect (DCI) Networks . . . . . . . . .   8
     3.4.  Multicast Use cases . . . . . . . . . . . . . . . . . . .   8
   4.  Requirements  . . . . . . . . . . . . . . . . . . . . . . . .   9
     4.1.  MPLS Transport  . . . . . . . . . . . . . . . . . . . . .   9
     4.2.  SLA Guarantee . . . . . . . . . . . . . . . . . . . . . .  10
     4.3.  Scalability . . . . . . . . . . . . . . . . . . . . . . .  10
     4.4.  Availability  . . . . . . . . . . . . . . . . . . . . . .  10
     4.5.  Operations  . . . . . . . . . . . . . . . . . . . . . . .  10
     4.6.  Service Mapping . . . . . . . . . . . . . . . . . . . . .  11
   5.  Seamless Segment Routing architecture . . . . . . . . . . . .  11
     5.1.  Solution Concepts . . . . . . . . . . . . . . . . . . . .  11
     5.2.  BGP Classful Transport  . . . . . . . . . . . . . . . . .  12
     5.3.  Automatically Creating Transport Classes  . . . . . . . .  17
       5.3.1.  Automatically Creating Transport Classes for BGP-SR-
               TE Intra-domain Tunnels . . . . . . . . . . . . . . .  17
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