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Fast Reroute Extensions to Rsvp-Te for Lsp Tunnels

By Pan, P.

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Book Id: WPLBN0000694166
Format Type: PDF eBook
File Size: 83.23 KB.
Reproduction Date: 2005
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Title: Fast Reroute Extensions to Rsvp-Te for Lsp Tunnels  
Author: Pan, P.
Volume:
Language: English
Subject: Technology, Science, Tools.
Collections: Technical eBooks Collection
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Pan, P. (n.d.). Fast Reroute Extensions to Rsvp-Te for Lsp Tunnels. Retrieved from http://www.netlibrary.net/


Description
Technical Reference Publication

Excerpt
Introduction: This document extends RSVP [RSVP] to establish backup label-switched path (LSP) tunnels for the local repair of LSP tunnels. This extension will meet the needs of real-time applications such as voice over IP, for which user traffic should be redirected onto backup LSP tunnels in 10s of milliseconds. This timing requirement can be satisfied by computing and signaling backup LSP tunnels in advance of failure and by re-directing traffic as close to the failure point as possible. In this way, the time for redirection includes no path computation and no signaling delays, including delays to propagate failure notification between label-switched routers (LSRs). Speed of repair is the primary advantage of the methods and extensions described here. The term local repair is used when referring to techniques that re-direct traffic to a backup LSP tunnel in response to a local failure.

Table of Contents
Table of Contents 1. Introduction ...................................................3 1.1. Background ...............................................4 2. Terminology ....................................................4 3. Local Repair Techniques ........................................6 3.1. One-to-One Backup ........................................6 3.2. Facility Backup ..........................................7 4. RSVP Extensions ................................................8 4.1. FAST_REROUTE Object ......................................8 4.2. DETOUR Object ...........................................11 4.2.1. DETOUR Object for IPv4 Address ...................11 4.2.2. DETOUR Object for IPv6 Address ...................12 4.3. SESSION_ATTRIBUTE Flags .................................13 4.4. RRO IPv4/IPv6 Sub-object Flags ..........................14 5. Head-End Behavior .............................................15 6. Point of Local Repair (PLR) Behavior ..........................16 6.1. Signaling a Backup Path .................................17 6.1.1. Backup Path Identification: Sender Template-Specific ................................19 6.1.2. Backup Path Identification: Path-Specific ........19 6.2. Procedures for Backup Path Computation ..................20 6.3. Signaling Backups for One-to-One Protection .............21 6.3.1. Make-before-Break with Detour LSPs ...............22 6.3.2. Message Handling .................................23 6.3.3. Local Reroute of Traffic onto Detour LSP .........23 6.4. Signaling for Facility Protection .......................24 6.4.1. Discovering Downstream Labels ....................24 6.4.2. Procedures for the PLR before Local Repair .......24 6.4.3. Procedures for the PLR during Local Repair .......25 6.4.4. Processing Backup Tunnel's ERO ...................26 6.5. PLR Procedures during Local Repair ......................26 6.5.1. Notification of Local Repair .....................26 6.5.2. Revertive Behavior ...............................27 7. Merge Node Behavior ...........................................28 7.1. Handling Backup Path Messages before Failure ............28 7.1.1. Merging Backup Paths using the Sender Template-Specific Method .........................29 7.1.2. Merging Detours using the Path-Specific Method ...29 7.1.3. Message Handling for Merged Detours ..............31 7.2. Handling Failures .......................................31 8. Behavior of All LSRs ..........................................32 8.1. Merging Detours in the Path-Specific Method .............32 9. Security Considerations .......................................33 10. IANA Considerations ...........................................33 11. Contributors ..................................................35 12. Acknowledgments ...............................................36 13. Normative References ..........................................36 3

 

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