Cisco CRS-1 - Carrier Routing System Router Troubleshooting Manual page 9

Preface
This guide describes how to troubleshooting a router using the Cisco IOS XR software.
This preface contains the following sections:
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Changes to This Document
Table 1
Table 1 Changes to This Document
Revision Date
OL-21483-02 October,
2010
OL-21483-02
Changes to This Document, page vii
Obtaining Documentation and Submitting a Service Request, page viii
lists the technical changes made to this document since it was first issued.
Change Summary
Added information about the following topics:
Chapter 1—Added links to information on SNMP timeouts and the MIBs download site.
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Chapter 1—Added a list of commands to use to gather information prior to contacting TAC.
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Chapter 4—Added a drawing of the fabric architecture.
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Chapter 4—Added information about using online diagnostics to help troubleshoot fabric.
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Chapter 4—Added the CLI command show controllers fabric link health.
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Chapter 4—Added information about using the correct fiber cleaning kit and procedure.
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Chapter 4—Added a section with guidelines on maintenance of fabric links.
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Continued, next page
Cisco IOS XR Troubleshooting Guide for the Cisco CRS-1 Router
vii