RSVP-TE Extensions for Collecting Shared Risk Link Group (SRLG) Information
RFC 8001
Internet Engineering Task Force (IETF) F. Zhang, Ed.
Request for Comments: 8001 Huawei
Category: Standards Track O. Gonzalez de Dios, Ed.
ISSN: 2070-1721 Telefonica Global CTO
C. Margaria
Juniper
M. Hartley
Z. Ali
Cisco
January 2017
RSVP-TE Extensions for Collecting
Shared Risk Link Group (SRLG) Information
Abstract
This document provides extensions for Resource Reservation Protocol -
Traffic Engineering (RSVP-TE), including GMPLS, to support automatic
collection of Shared Risk Link Group (SRLG) information for the TE
link formed by a Label Switched Path (LSP).
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 7841.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc8001.
Zhang, et al. Standards Track [Page 1]
RFC 8001 RSVP-TE Ext for Collecting SRLG January 2017
Copyright Notice
Copyright (c) 2017 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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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Applicability Example: Dual-Homing . . . . . . . . . . . . 3
2. Requirements Language . . . . . . . . . . . . . . . . . . . . 5
3. RSVP-TE Requirements . . . . . . . . . . . . . . . . . . . . . 5
3.1. SRLG Collection Indication . . . . . . . . . . . . . . . . 5
3.2. SRLG Collection . . . . . . . . . . . . . . . . . . . . . 6
3.3. SRLG Update . . . . . . . . . . . . . . . . . . . . . . . 6
3.4. SRLG ID Definition . . . . . . . . . . . . . . . . . . . . 6
4. Encodings . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.1. SRLG Collection Flag . . . . . . . . . . . . . . . . . . . 6
4.2. RRO SRLG Subobject . . . . . . . . . . . . . . . . . . . 7
5. Signaling Procedures . . . . . . . . . . . . . . . . . . . . . 8
5.1. SRLG Collection . . . . . . . . . . . . . . . . . . . . . 8
5.2. SRLG Update . . . . . . . . . . . . . . . . . . . . . . . 10
5.3 Domain Boundaries . . . . . . . . . . . . . . . . . . . . . 10
5.4. Compatibility . . . . . . . . . . . . . . . . . . . . . . 11
6. Manageability Considerations . . . . . . . . . . . . . . . . . 11
6.1. Policy Configuration . . . . . . . . . . . . . . . . . . . 11
6.2. Coherent SRLG IDs . . . . . . . . . . . . . . . . . . . . 11
7. Security Considerations . . . . . . . . . . . . . . . . . . . 12
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 12
8.1. RSVP Attribute Bit Flags . . . . . . . . . . . . . . . . . 12
8.2. ROUTE_RECORD Object . . . . . . . . . . . . . . . . . . . 12
8.3. Policy Control Failure Error Subcodes . . . . . . . . . . 13
9. References . . . . . . . . . . . . . . . . . . . . . . . . . . 13
9.1. Normative References . . . . . . . . . . . . . . . . . . . 13
9.2. Informative References . . . . . . . . . . . . . . . . . . 14
Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . . 15
Contributors . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 16
Zhang, et al. Standards Track [Page 2]
RFC 8001 RSVP-TE Ext for Collecting SRLG January 2017
1. Introduction
It is important to understand which Traffic Engineering (TE) links in
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