Troubleshooting guide

4 Advanced System Diagnostics and Troubleshooting Guide
Contents
Definition of Terms 26
Standard Ethernet Detection for Packet Errors on the Wire 27
Extreme Networks’ Complementary Detection of Packet Errors Between Wires 27
Hardware System Detection Mechanisms 28
Software System Detection Mechanisms 29
Failure Modes 30
Transient Failures 30
Systematic Failures 30
Soft-State Failures 30
Permanent Failures 31
Responding to Reported Failures 31
Health Check Messages 33
Alert Messages 33
Checksum Error Messages: 34
Corrective Behavior Messages 35
Chapter 4 Software Exception Handling
Overview of Software Exception Handling Features 37
System Watchdog Behavior 37
System Software Exception Recovery Behavior 38
Redundant MSM Behavior 38
Configuring System Recovery Actions 40
Related Commands 40
Configuring System Recovery Actions on “i” Series Switches 40
Configuring System Recovery Actions on “e” Series Switches 41
Usage Notes 41
Configuring Reboot Loop Protection 43
Related Commands 43
Configuring Reboot Loop Protection 43
Dumping the “i” Series Switch System Memory 45
Related Commands 45
Configuring an Automatic System Dump During System Recovery 45
Initiating a Manual System Dump 46
Example Log for a Software Exception 47
Chapter 5 Diagnostics
Diagnostic Test Functionality 49
How Diagnostic Tests are Run 49
How the Test Affects the Switch 50
System Health Checks: A Diagnostics Suite 52
Diagnostic Suite Components 52
The Role of Memory Scanning and Memory Mapping 53
Modes of Operation 54