Troubleshooting Guide

Contents
Chapter 1: Introduction.......................................................................................................... 10
Purpose................................................................................................................................ 10
Related resources................................................................................................................. 10
Support................................................................................................................................ 13
Chapter 2: Safety messages.................................................................................................. 15
Notices................................................................................................................................. 15
Chapter 3: New in this document.......................................................................................... 17
Features............................................................................................................................... 17
Chapter 4: Data collection required for Technical Support cases..................................... 19
Data collection for an outage.................................................................................................. 19
Collecting data before you restart..................................................................................... 19
Collecting data after you restart........................................................................................ 20
Data collection for non outage problems.................................................................................. 21
Gathering critical information............................................................................................ 21
Chapter 5: Troubleshooting planning fundamentals.......................................................... 22
Proper installation and routine maintenance............................................................................ 22
Network configuration............................................................................................................ 22
Normal behavior on the network............................................................................................. 23
Chapter 6: Troubleshooting fundamentals.......................................................................... 25
Connectivity problems........................................................................................................... 25
Routing table problems.......................................................................................................... 26
LED indications of problems................................................................................................... 26
Cable connection problems.................................................................................................... 27
Alarm database..................................................................................................................... 27
Chapter 7: Troubleshooting tool fundamentals................................................................... 28
Troubleshooting overview...................................................................................................... 28
Digital Diagnostic Monitoring.................................................................................................. 29
Flight Recorder..................................................................................................................... 30
Port mirroring........................................................................................................................ 31
General diagnostic tools......................................................................................................... 34
Chapter 8: Log and trap fundamentals................................................................................. 36
Overview of traps and logs..................................................................................................... 36
Secure syslog....................................................................................................................... 38
Simple Network Management Protocol.................................................................................... 39
Log message format.............................................................................................................. 40
Log files................................................................................................................................ 43
Log file transfer..................................................................................................................... 44
Chapter 9: Log configuration using ACLI............................................................................. 46
January 2017 Troubleshooting 4
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