Remote-LFA Node Protection and Manageability
draft-ietf-rtgwg-rlfa-node-protection-11
The information below is for an old version of the document | |||
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Document | Type | Active Internet-Draft (rtgwg WG) | |
Authors | Pushpasis Sarkar , Shraddha Hegde , Chris Bowers , Hannes Gredler , Stephane Litkowski | ||
Last updated | 2017-01-19 | ||
Replaces | draft-psarkar-rtgwg-rlfa-node-protection | ||
Stream | IETF | ||
Intended RFC status | Proposed Standard | ||
Formats | pdf htmlized (tools) htmlized bibtex | ||
Reviews | |||
Stream | WG state | Submitted to IESG for Publication | |
Document shepherd | Jon Mitchell | ||
Shepherd write-up | Show (last changed 2016-11-17) | ||
IESG | IESG state | IESG Evaluation::AD Followup | |
Consensus Boilerplate | Yes | ||
Telechat date |
Needs 7 more YES or NO OBJECTION positions to pass. |
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Responsible AD | Alia Atlas | ||
Send notices to | "Jon Mitchell" <jrmitche@puck.nether.net> | ||
IANA | IANA review state | Version Changed - Review Needed |
Routing Area Working Group P. Sarkar, Ed. Internet-Draft Individual Contributor Intended status: Standards Track S. Hegde Expires: July 24, 2017 C. Bowers Juniper Networks, Inc. H. Gredler RtBrick, Inc. S. Litkowski Orange January 20, 2017 Remote-LFA Node Protection and Manageability draft-ietf-rtgwg-rlfa-node-protection-11 Abstract The loop-free alternates computed following the current Remote-LFA specification guarantees only link-protection. The resulting Remote- LFA nexthops (also called PQ-nodes), may not guarantee node- protection for all destinations being protected by it. This document describes an extension to the Remote Loop-Free based IP fast reroute mechanisms described in [RFC7490], that describes procedures for determining if a given PQ-node provides node- protection for a specific destination or not. The document also shows how the same procedure can be utilized for collection of complete characteristics for alternate paths. Knowledge about the characteristics of all alternate path is precursory to apply operator defined policy for eliminating paths not fitting constraints. 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 RFC2119 [RFC2119]. 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/. Sarkar, et al. Expires July 24, 2017 [Page 1] Internet-Draft R-LFA Node-Protection and Manageability January 2017 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 July 24, 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 Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1. Abbreviations . . . . . . . . . . . . . . . . . . . . . . 3 2. Node Protection with Remote-LFA . . . . . . . . . . . . . . . 4 2.1. The Problem . . . . . . . . . . . . . . . . . . . . . . . 4 2.2. Additional Definitions . . . . . . . . . . . . . . . . . 6 2.2.1. Link-Protecting Extended P-Space . . . . . . . . . . 6 2.2.2. Node-Protecting Extended P-Space . . . . . . . . . . 6 2.2.3. Q-Space . . . . . . . . . . . . . . . . . . . . . . . 7 2.2.4. Link-Protecting PQ Space . . . . . . . . . . . . . . 7 2.2.5. Candidate Node-Protecting PQ Space . . . . . . . . . 7 2.2.6. Cost-Based Definitions . . . . . . . . . . . . . . . 7 2.2.6.1. Link-Protecting Extended P-Space . . . . . . . . 7 2.2.6.2. Node-Protecting Extended P-Space . . . . . . . . 8 2.2.6.3. Q-Space . . . . . . . . . . . . . . . . . . . . . 9 2.3. Computing Node-protecting R-LFA Path . . . . . . . . . . 9 2.3.1. Computing Candidate Node-protecting PQ-Nodes for Primary nexthops . . . . . . . . . . . . . . . . . . 9 2.3.2. Computing node-protecting paths from PQ-nodes to destinations . . . . . . . . . . . . . . . . . . . . 11 2.3.3. Computing Node-Protecting R-LFA Paths for Destinations with ECMP primary nexthop nodes . . . . 13 2.3.4. Limiting extra computational overhead . . . . . . . . 17Show full document text