Network Working Group F. Zhang, Ed.
Internet-Draft Huawei
Intended status: Standards Track O. Gonzalez de Dios, Ed.
Expires: August 18, 2014 Telefonica Global CTO
D. Li
Huawei
C. Margaria
M. Hartley
Z. Ali
Cisco
February 14, 2014
RSVP-TE Extensions for Collecting SRLG Information
draft-ietf-ccamp-rsvp-te-srlg-collect-04
Abstract
This document provides extensions for the Resource ReserVation
Protocol-Traffic Engineering (RSVP-TE) to support automatic
collection of Shared Risk Link Group (SRLG) Information for the TE
link formed by a LSP.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. RSVP-TE Requirements . . . . . . . . . . . . . . . . . . . . 3
2.1. SRLG Collection Indication . . . . . . . . . . . . . . . 3
2.2. SRLG Collection . . . . . . . . . . . . . . . . . . . . . 3
2.3. SRLG Update . . . . . . . . . . . . . . . . . . . . . . . 3
3. RSVP-TE Extensions (Encoding) . . . . . . . . . . . . . . . . 3
3.1. SRLG Collection Flag . . . . . . . . . . . . . . . . . . 3
3.2. SRLG sub-object . . . . . . . . . . . . . . . . . . . . . 4
4. Signaling Procedures . . . . . . . . . . . . . . . . . . . . 4
4.1. SRLG Collection . . . . . . . . . . . . . . . . . . . . . 4
4.2. SRLG Update . . . . . . . . . . . . . . . . . . . . . . . 6
5. Manageability Considerations . . . . . . . . . . . . . . . . 6
5.1. Policy Configuration . . . . . . . . . . . . . . . . . . 6
5.2. Coherent SRLG IDs . . . . . . . . . . . . . . . . . . . . 6
6. Security Considerations . . . . . . . . . . . . . . . . . . . 7
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 7
7.1. RSVP Attribute Bit Flags . . . . . . . . . . . . . . . . 7
7.2. ROUTE_RECORD Object . . . . . . . . . . . . . . . . . . . 7
7.3. Policy Control Failure Error subcodes . . . . . . . . . . 8
8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 8
9. Normative References . . . . . . . . . . . . . . . . . . . . 8
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 9
1. Introduction
It is important to understand which TE links in the network might be
at risk from the same failures. In this sense, a set of links may
constitute a 'shared risk link group' (SRLG) if they share a resource
whose failure may affect all links in the set [RFC4202].
On the other hand, as described in [RFC4206] and [RFC6107], H-LSP
(Hierarchical LSP) or S-LSP (stitched LSP) can be used for carrying
one or more other LSPs. Both of the H-LSP and S-LSP can be formed as
datatracker.ietf.org