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