SR Policies Extensions for Path Segment and Bidirectional Path in BGP-LS
draft-ietf-idr-bgp-ls-sr-policy-path-segment-00
Interdomain Routing Working Group C. Li
Internet-Draft Z. Li
Intended status: Standards Track Huawei Technologies
Expires: May 5, 2020 H. Chen
China Telecom
W. Cheng
China Mobile
K. Talaulikar
Cisco Systems
November 2, 2019
SR Policies Extensions for Path Segment and Bidirectional Path in BGP-LS
draft-ietf-idr-bgp-ls-sr-policy-path-segment-00
Abstract
This document specifies the way of collecting configuration and
states of SR policies carrying Path Segment and bidirectional path
information by using BPG-LS. Such information can be used by
external conponents for many use cases such as performance
measurement, path re-optimization and end-to-end protection.
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.
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This Internet-Draft will expire on May 5, 2020.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Carrying SR Path Sub-TLVs in BGP-LS . . . . . . . . . . . . . 3
3.1. SR Path Segment Sub-TLV . . . . . . . . . . . . . . . . . 5
3.2. Sub-TLVs for Bidirectional Path . . . . . . . . . . . . . 6
3.2.1. SR Bidirectional Path Sub-TLV . . . . . . . . . . . . 6
3.2.2. SR Reverse Path Segment List Sub-TLV . . . . . . . . 7
4. Operations . . . . . . . . . . . . . . . . . . . . . . . . . 7
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 7
5.1. BGP-LS TLVs . . . . . . . . . . . . . . . . . . . . . . . 7
5.2. BGP-LS SR Segment Descriptors . . . . . . . . . . . . . . 8
6. Security Considerations . . . . . . . . . . . . . . . . . . . 8
7. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 8
8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 9
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 9
9.1. Normative References . . . . . . . . . . . . . . . . . . 9
9.2. Informative References . . . . . . . . . . . . . . . . . 10
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 11
1. Introduction
Segment routing (SR) [RFC8402] is a source routing paradigm that
allows the ingress node steers packets into a specific path according
to the Segment Routing Policy
[I-D.ietf-spring-segment-routing-policy].
However, the SR Policies defined in
[I-D.ietf-spring-segment-routing-policy] only supports unidirectional
SR paths and there is no path ID in a Segment List to identify an SR
path. For identifying an SR path and supporting bidirectional path
[I-D.ietf-spring-mpls-path-segment], new policies carrying Path
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