SR Policy Implementation and Deployment Considerations
draft-filsfils-spring-sr-policy-considerations-02
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SPRING Working Group C. Filsfils
Internet-Draft K. Talaulikar, Ed.
Intended status: Informational Cisco Systems, Inc.
Expires: April 24, 2019 P. Krol
Google, Inc.
M. Horneffer
Deutsche Telekom
P. Mattes
Microsoft
October 21, 2018
SR Policy Implementation and Deployment Considerations
draft-filsfils-spring-sr-policy-considerations-02.txt
Abstract
Segment Routing (SR) allows a headend node to steer a packet flow
along any path. Intermediate per-flow states are eliminated thanks
to source routing. SR Policy framework enables the instantiation and
the management of necessary state on the headend node for flows along
a source routed paths using an ordered list of segments associated
with their specific SR Policies. This document describes some of the
implementation and deployment aspects that are useful for
operationalizing the SR Policy architecture.
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
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 April 24, 2019.
Copyright Notice
Copyright (c) 2018 IETF Trust and the persons identified as the
document authors. All rights reserved.
Filsfils, et al. Expires April 24, 2019 [Page 1]
Internet-Draft SR Policy Considerations October 2018
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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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. SR Policy Headend Architecture . . . . . . . . . . . . . . . 3
3. Dynamic Path Computation . . . . . . . . . . . . . . . . . . 4
3.1. Optimization Objective . . . . . . . . . . . . . . . . . 4
3.2. Constraints . . . . . . . . . . . . . . . . . . . . . . . 5
3.3. SR Native Algorithm . . . . . . . . . . . . . . . . . . . 6
3.4. Path to SID . . . . . . . . . . . . . . . . . . . . . . . 7
4. Candidate Path Selection . . . . . . . . . . . . . . . . . . 7
5. Distributed and/or Centralized Control Plane . . . . . . . . 11
5.1. Distributed Control Plane within a single Link-State IGP
area . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.2. Distributed Control Plane across several Link-State IGP
areas . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.3. Centralized Control Plane . . . . . . . . . . . . . . . . 12
5.4. Distributed and Centralized Control Plane . . . . . . . . 12
6. Binding SID Aspects . . . . . . . . . . . . . . . . . . . . . 13
6.1. Benefits of Binding SID . . . . . . . . . . . . . . . . . 13
6.2. Centralized Discovery of available BSID . . . . . . . . . 14
7. Flex-Algorithm Based SR Policies . . . . . . . . . . . . . . 16
8. Layer 2 and Optical Transport . . . . . . . . . . . . . . . . 17
9. Security Considerations . . . . . . . . . . . . . . . . . . . 18
10. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 18
11. Acknowledgement . . . . . . . . . . . . . . . . . . . . . . . 18
12. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 18
13. References . . . . . . . . . . . . . . . . . . . . . . . . . 20
13.1. Normative References . . . . . . . . . . . . . . . . . . 20
13.2. Informative References . . . . . . . . . . . . . . . . . 20
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 22
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