Seamless Segment Routing
draft-hegde-spring-mpls-seamless-sr-01
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2020-07-26
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SPRING S. Hegde
Internet-Draft C. Bowers
Intended status: Standards Track Juniper Networks Inc.
Expires: January 27, 2021 X. Xu
Alibaba Inc.
A. Gulko
Refinitiv
A. Bogdanov
Google Inc.
J. Uttaro
ATT
July 26, 2020
Seamless Segment Routing
draft-hegde-spring-mpls-seamless-sr-01
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
working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
Hegde, et al. Expires January 27, 2021 [Page 1]
Internet-Draft Seamless Segment Routing July 2020
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on January 27, 2021.
Copyright Notice
Copyright (c) 2020 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(https://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
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include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
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
5.3.2. Automatically Creating Transport Classes for Flex-
Algo Tunnels . . . . . . . . . . . . . . . . . . . . 17
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