draft-ietf-rtgwg-rlfa-node-protection-01.txt   draft-ietf-rtgwg-rlfa-node-protection-02.txt 
Routing Area Working Group P. Sarkar, Ed. Routing Area Working Group P. Sarkar, Ed.
Internet-Draft H. Gredler Internet-Draft H. Gredler
Intended status: Standards Track S. Hegde Intended status: Standards Track S. Hegde
Expires: June 18, 2015 C. Bowers Expires: December 17, 2015 C. Bowers
Juniper Networks, Inc. Juniper Networks, Inc.
S. Litkowski S. Litkowski
Orange Orange
H. Raghuveer H. Raghuveer
June 15, 2015
December 15, 2014
Remote-LFA Node Protection and Manageability Remote-LFA Node Protection and Manageability
draft-ietf-rtgwg-rlfa-node-protection-01 draft-ietf-rtgwg-rlfa-node-protection-02
Abstract Abstract
The loop-free alternates computed following the current Remote-LFA The loop-free alternates computed following the current Remote-LFA
[I-D.ietf-rtgwg-remote-lfa] specification gaurantees only link- [I-D.ietf-rtgwg-remote-lfa] specification gaurantees only link-
protection. The resulting Remote-LFA nexthops (also called PQ- protection. The resulting Remote-LFA nexthops (also called PQ-
nodes), may not gaurantee node-protection for all destinations being nodes), may not gaurantee node-protection for all destinations being
protected by it. protected by it.
This document describes procedures for determining if a given PQ-node This document describes procedures for determining if a given PQ-node
skipping to change at page 2, line 10 skipping to change at page 2, line 7
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This Internet-Draft will expire on June 18, 2015. This Internet-Draft will expire on December 17, 2015.
Copyright Notice Copyright Notice
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Table of Contents Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Node Protection with Remote-LFA . . . . . . . . . . . . . . . 3 2. Node Protection with Remote-LFA . . . . . . . . . . . . . . . 3
2.1. The Problem . . . . . . . . . . . . . . . . . . . . . . . 4 2.1. The Problem . . . . . . . . . . . . . . . . . . . . . . . 4
2.2. Few Additional Definitions . . . . . . . . . . . . . . . 5 2.2. Few Additional Definitions . . . . . . . . . . . . . . . 5
2.2.1. Link-Protecting Extended P-Space . . . . . . . . . . 6 2.2.1. Link-Protecting Extended P-Space . . . . . . . . . . 5
2.2.2. Node-Protecting Extended P-Space . . . . . . . . . . 6 2.2.2. Node-Protecting Extended P-Space . . . . . . . . . . 6
2.2.3. Q-Space . . . . . . . . . . . . . . . . . . . . . . . 7 2.2.3. Q-Space . . . . . . . . . . . . . . . . . . . . . . . 7
2.2.4. Link-Protecting PQ Space . . . . . . . . . . . . . . 8 2.2.4. Link-Protecting PQ Space . . . . . . . . . . . . . . 8
2.2.5. Candidate Node-Protecting PQ Space . . . . . . . . . 8 2.2.5. Candidate Node-Protecting PQ Space . . . . . . . . . 8
2.3. Computing Node-protecting R-LFA Path . . . . . . . . . . 8 2.3. Computing Node-protecting R-LFA Path . . . . . . . . . . 8
2.3.1. Computing Candidate Node-protecting PQ-Nodes for 2.3.1. Computing Candidate Node-protecting PQ-Nodes for
Primary nexthops . . . . . . . . . . . . . . . . . . 8 Primary nexthops . . . . . . . . . . . . . . . . . . 8
2.3.2. Computing node-protecting paths from PQ-nodes to 2.3.2. Computing node-protecting paths from PQ-nodes to
destinations . . . . . . . . . . . . . . . . . . . . 10 destinations . . . . . . . . . . . . . . . . . . . . 10
2.3.3. Limiting extra computational overhead . . . . . . . . 12 2.3.3. Limiting extra computational overhead . . . . . . . . 12
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