Segment Routing with MPLS data plane
draft-ietf-spring-segment-routing-mpls-19
| The information below is for an old version of the document | |||
|---|---|---|---|
| Document | Type | Active Internet-Draft (spring WG) | |
| Authors | Ahmed Bashandy , Clarence Filsfils , Stefano Previdi , Bruno Decraene , Stephane Litkowski , Rob Shakir | ||
| Last updated | 2019-04-11 (latest revision 2019-03-28) | ||
| Replaces | draft-filsfils-spring-segment-routing-mpls | ||
| Stream | Internet Engineering Task Force (IETF) | ||
| Formats | pdf htmlized (tools) htmlized bibtex | ||
| Reviews | |||
| Stream | WG state | Submitted to IESG for Publication (wg milestone: Oct 2018 - SR-MPLS sent to IESG... ) | |
| Document shepherd | Shraddha Hegde | ||
| Shepherd write-up | Show (last changed 2018-12-03) | ||
| IESG | IESG state | IESG Evaluation::Revised I-D Needed | |
| Consensus Boilerplate | Yes | ||
| Telechat date |
Needs 4 more YES or NO OBJECTION positions to pass. |
||
| Responsible AD | Martin Vigoureux | ||
| Send notices to | Shraddha Hegde <shraddha@juniper.net> | ||
| IANA | IANA review state | IANA OK - No Actions Needed | |
Network Working Group A. Bashandy, Ed.
Internet Draft Arrcus
Intended status: Standards Track C. Filsfils, Ed.
Expires: September 2019 S. Previdi,
Cisco Systems, Inc.
B. Decraene
S. Litkowski
Orange
R. Shakir
Google
March 28, 2019
Segment Routing with MPLS data plane
draft-ietf-spring-segment-routing-mpls-19
Abstract
Segment Routing (SR) leverages the source routing paradigm. A node
steers a packet through a controlled set of instructions, called
segments, by prepending the packet with an SR header. In the MPLS
dataplane, the SR header is instantiated through a label stack. This
document specifies the forwarding behavior to allow instantiating SR
over the MPLS dataplane.
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 http://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 September 28, 2019.
Filsfils, et al. Expires September 28, 2019 [Page 1]
Internet-Draft Segment Routing with MPLS March 2019
Copyright Notice
Copyright (c) 2019 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
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described in the Simplified BSD License.
Table of Contents
1. Introduction...................................................3
1.1. Requirements Language.....................................4
2. MPLS Instantiation of Segment Routing..........................4
2.1. Multiple Forwarding Behaviors for the Same Prefix.........5
2.2. SID Representation in the MPLS Forwarding Plane...........5
2.3. Segment Routing Global Block and Local Block..............6
2.4. Mapping a SID Index to an MPLS label......................6
2.5. Incoming Label Collision..................................7
2.5.1. Tie-breaking Rules..................................10
2.5.2. Redistribution between Routing Protocol Instances...13
2.5.2.1. Illustration...................................13
2.5.2.2. Illustration 2.................................13
2.6. Effect of Incoming Label Collision on Outgoing Label
Programming...................................................14
2.7. PUSH, CONTINUE, and NEXT.................................14
2.7.1. PUSH................................................14
2.7.2. CONTINUE............................................15
2.7.3. NEXT................................................15
2.7.3.1. Mirror SID.....................................15
2.8. MPLS Label Downloaded to FIB for Global and Local SIDs...15
2.9. Active Segment...........................................16
2.10. Forwarding behavior for Global SIDs.....................16
2.10.1. Forwarding for PUSH and CONTINUE of Global SIDs....16
2.10.2. Forwarding for NEXT Operation for Global SIDs......18
2.11. Forwarding Behavior for Local SIDs......................18
2.11.1. Forwarding for PUSH Operation on Local SIDs........18
2.11.2. Forwarding for CONTINUE Operation for Local SIDs...19
2.11.3. Outgoing label for NEXT Operation for Local SIDs...19
3. IANA Considerations...........................................19
Filsfils, et al. Expires September 28, 2019 [Page 2]
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