A Simplified Scalable E-Line Service Model with Segment Routing Underlay
draft-boutros-bess-eline-services-over-sr-00

Document Type Active Internet-Draft (individual)
Authors Sami Boutros  , Siva Sivabalan  , Jim Uttaro  , Daniel Voyer  , Bin Wen  , Luay Jalil 
Last updated 2020-11-02
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BESS Workgroup                                           S. Boutros, Ed.
Internet-Draft                                         S. Sivabalan, Ed.
Intended status: Standards Track                       Ciena Corporation
Expires: May 6, 2021                                           J. Uttaro
                                                                    AT&T
                                                                D. Voyer
                                                             Bell Canada
                                                                  B. Wen
                                                                 Comcast
                                                                L. Jalil
                                                                 Verizon
                                                        November 2, 2020

A Simplified Scalable E-Line Service Model with Segment Routing Underlay
              draft-boutros-bess-eline-services-over-sr-00

Abstract

   This document proposes a new approach for realizing Ethernet line
   (E-Line) services over Segment Routing (SR) networks.  This approach
   significantly improves scalability and convergence of control plane,
   and simplifies network operation.  Furthermore, it naturally yields
   All-Active multi-homing support for E-Line services without relying
   on any overlay techniques.

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 May 6, 2021.

Copyright Notice

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

Boutros, et al.            Expires May 6, 2021                  [Page 1]
Internet-Draft    E-Line Services with Segment Routing     November 2020

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Abbreviations . . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Control Plane Behavior  . . . . . . . . . . . . . . . . . . .   5
     4.1.  Service discovery . . . . . . . . . . . . . . . . . . . .   5
     4.2.  All-Active Service Redundancy . . . . . . . . . . . . . .   5
     4.3.  E-Line Attributes . . . . . . . . . . . . . . . . . . . .   5
     4.4.  Service withdrawal  . . . . . . . . . . . . . . . . . . .   6
   5.  Data Plane Behavior . . . . . . . . . . . . . . . . . . . . .   6
     5.1.  Data Packet Format  . . . . . . . . . . . . . . . . . . .   6
     5.2.  Aliasing  . . . . . . . . . . . . . . . . . . . . . . . .   7
     5.3.  Single-Homed CE . . . . . . . . . . . . . . . . . . . . .   7
     5.4.  Multi-Homed CE  . . . . . . . . . . . . . . . . . . . . .   7
   6.  Benefits of E-Line services over SR . . . . . . . . . . . . .   8
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   9.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   8
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     10.1.  Normative References . . . . . . . . . . . . . . . . . .   8
     10.2.  Informative References . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   9

1.  Introduction

   Historically, E-Line services are realized as Virtual Private Wire
   Services (VPWS) using point-to-point (P2P) Pseudo-Wires (PWs).  A PW
   identifies both the service type and the service termination nodes in
   both control and data planes.  A PW can be dynamically established
   via LDP or BGP.  Ethernet VPN (EVPN) signaling mechanisms via BGP can
   be used to provide VPWS with Single-Active and All-Active multihoming
   redundancy as well as Inter-Autonomous System (AS) support.
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