Extreme Networks ExtremeWare Version 7.8 Manuale utente

Extreme Networks, Inc.

3585 Monroe Street

Santa Clara, California 95051

(888) 257-3000

http://www.extremenetworks.com

Advanced System

Diagnostics and

Troubleshooting Guide

ExtremeWare Software Version 7.8

Published: May 2008

Part number: 100279-00 Rev 01

registered trademarks of Extreme Networks, Inc. in the United States and certain other jurisdictions. ExtremeWare Vista,

ExtremeWorks, ExtremeAssist, ExtremeAssist1, ExtremeAssist2, PartnerAssist, EPICenter, Extreme Standby Router

Protocol, ESRP, SmartTraps, Summit, Summit1i, Summit5i, Summit7i,Summit48i, Summit48si, SummitPx, Summit 200,

Summit Virtual Chassis, SummitLink, SummitGbX, SummitRPS and the Extreme Networks logo are trademarks of

Extreme Networks, Inc., which may be registered or pending registration in certain jurisdictions. The Extreme

Turbodrive logo is a service mark of Extreme Networks, which may be registered or pending registration in certain

jurisdictions. Specifications are subject to change without notice.

NetWare and Novell are registered trademarks of Novell, Inc. Solaris is a trademark of Sun Microsystems, Inc. F5,

BIG/ip, and 3DNS are registered trademarks of F5 Networks, Inc. see/IT is a trademark of F5 Networks, Inc.

“Data Fellows”, the triangle symbol, and Data Fellows product names and symbols/logos are

trademarks of Data Fellows.

F-Secure SSH is a registered trademark of Data Fellows.

All other registered trademarks, trademarks and service marks are property of their respective owners.

Advanced System Diagnostics and Troubleshooting Guide 3

Contents

Preface

Introduction 9

Terminology 9

Conventions 9

Related Publications 10

Chapter 1 Introduction

Introduction 11

Diagnostics: A Brief Historical Perspective 12

Overview of the ExtremeWare Diagnostics Suite 12

Supported Hardware 13

Applicable ExtremeWare Versions 13

Chapter 2“

” Series Switch Hardware Architecture

Diagnostics Support 15

The BlackDiamond Systems 16

BlackDiamond 6800 Series Hardware Architecture Differences 16

The BlackDiamond Backplane 17

BlackDiamond I/O Modules 18

Management Switch Modules 19

BlackDiamond MSM Redundancy 20

Causes of MSM Failover and System Behavior 20

Alpine Systems 22

Summit “i” Series Systems 23

Chapter 3 Packet Errors and Packet Error Detection

Overview 25

4Advanced 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

Advanced System Diagnostics and Troubleshooting Guide 5

Contents

The Role of Processes to Monitor System Operation 55

Power On Self Test (POST) 56

Related Commands 56

Configuring the Boot-Up Diagnostics 56

Runtime (On-Demand) System Diagnostics 57

Runtime Diagnostics on “i” Series Systems 57

Related Commands 58

Running the Diagnostics on BlackDiamond Systems 58

Runtime Diagnostics on “i” Series Alpine and Summit Systems 58

System Impact of Running the Diagnostics on “i” Series Switches 59

Runtime Diagnostics on “e” Series Systems 59

Related Commands 60

Running the Diagnostics on Summit “e” Switches 60

System Impact of Running the Diagnostics on Summit “e” Series Switches 60

Automatic Packet Memory Scan (via sys-health-check) 60

Memory Scanning and Memory Mapping Behavior 61

Limited Operation Mode 64

Effects of Running Memory Scanning on “i” Series Switches 64

Summit, Alpine, or BlackDiamond with a Single MSM 64

BlackDiamond System with Two MSMs 64

Interpreting Memory Scanning Results 66

Per-Slot Packet Memory Scan on BlackDiamond Switches 67

Related Commands 67

Configuring the Packet Memory Scan Recovery Mode 67

System Impact of Per-Slot Packet Memory Scanning 68

Network Impact of Per-Slot Packet Memory Scanning 68

System (CPU and Backplane) Health Check 70

Health Check Packet Types 70

Backplane Health Check States 70

Related Commands 71

Health Check Functionality 71

Alarm-Level Response Action 71

Auto-Recovery Response Action 71

Backplane Health Check 72

Viewing Backplane Health Check Results—show log Command 72

Viewing Backplane Health Check Diagnostic Results—show diagnostics Command 73

Analyzing the Results 78

CPU Health Check 79

Viewing CPU Health Check Results—show log Command 79

Viewing CPU Health Check Diagnostic Results—show diagnostics Command 80

Analyzing the CPU Health Check Results 80

Transceiver Diagnostics 82

Usage Guidelines 82

Related Commands 82

Configuring the Transceiver Diagnostics 82

6Advanced System Diagnostics and Troubleshooting Guide

Contents

System Impacts of the Transceiver Diagnostics 83

Network Impact of the Transceiver Diagnostics 83

Viewing Diagnostics Results 84

Example Log Messages for Transceiver Diagnostic Failures 84

Examples, show diagnostics Command 85

Example—show switch Command 86

Transceiver Diagnostic Result Analysis 87

FDB Scan 88

Usage Guidelines 88

Related Commands 89

Enabling FDB Scanning 89

Disabling FDB Scanning 89

Configuring the FDB Scan Diagnostics 90

System Impact of the FDB Scan Diagnostic 90

Network Impact of the FDB Scan Diagnostic 90

Viewing Diagnostics Results 91

Example Log Messages for FDB Scan Diagnostic Failures 91

Example FDB Scan Results from the show diagnostics Command 91

Example Output from the show switch command 92

Example Output from the show fdb remap Command 92

Chapter 6 Additional Diagnostics Tools

Temperature Logging for Modular Switches 93

Related Commands 93

System Impacts of Temperature Logging 94

Network Impact of Temperature Logging 94

Syslog Servers 94

Related Commands 94

Enabling Logging to Remote Syslog Server Targets 94

Disabling Logging to Remote Syslog Server Targets 95

Adding a Syslog Server 95

Deleting a Remote Syslog Server 95

System Impact of the Syslog Server Facility 95

Network Impact of the Syslog Server Facility 96

Cable Diagnostics 96

Cable Diagnostics for the High-Density Gigabit Ethernet I/O Modules in “i” Series

Switches 96

Related Commands 96

Running Cable Diagnostics 97

Viewing and Interpreting CDM Test Data 98

Cable Diagnostics for “e” Series Switches 101

Chapter 7 Troubleshooting Guidelines

Contacting Extreme Technical Support 103

Americas TAC 103

Advanced System Diagnostics and Troubleshooting Guide 7

Contents

Asia TAC 104

EMEA TAC 104

Japan TAC 104

What Information Should You Collect? 105

Analyzing Data 105

Diagnostic Troubleshooting 106

Extreme Networks’ Recommendations 107

Using Memory Scanning to Screen I/O Modules 109

Appendix A Limited Operation Mode and Minimal Operation Mode

Limited Operation Mode 111

Triggering Limited Operation Mode 112

Bringing a Switch Out of Limited Operation Mode 112

Minimal Operation Mode 112

Triggering Minimal Operation Mode 112

Bringing a Switch Out of Minimal Operation Mode 113

Appendix B Reference Documents

General Information 115

Other Documentation Resources 115

Index

Index of Commands

8Advanced System Diagnostics and Troubleshooting Guide

Contents

Advanced System Diagnostics and Troubleshooting Guide 9

Preface

This Preface provides an overview of this guide, describes guide conventions, and lists other

publications that might be useful.

Introduction

This guide describes how to use the ExtremeWare hardware diagnostics suite to test and validate the

operating integrity of Extreme Networks switches. The tools in the diagnostic suite are used to detect,

isolate, and treat faults in a system.

This guide is intended for use by network designers, planners, and operations staff.

Terminology

When features, functionality, or operation is specific to a modular or stand-alone switch family, the

family name is used. Explanations about features and operations that are the same across all product

families simply refer to the product as the “switch.”

Conventions

Table 1 and Table 2 list conventions that are used throughout this guide.

Table 1: Notice Icons

Icon Notice Type Alerts you to...

Note Important features or instructions.

Caution Risk of personal injury, system damage, or loss of data.

Warning Risk of severe personal injury.

10 Advanced System Diagnostics and Troubleshooting Guide

Preface

Related Publications

The publications related to this one are:

•ExtremeWare Software User Guide, Software Version 7.7.

•ExtremeWare Software Command Reference, Software Version 7.7.

•ExtremeWare Error Message Decoder.

Documentation for Extreme Networks products is available on the World Wide Web at the following

location:

http://www.extremenetworks.com/services/documentation/Default.asp

Table 2: Text Conventions

Convention Description

Screen displays This typeface indicates command syntax, or represents information as it appears on the

screen.

The words “enter”

and “type” When you see the word “enter” in this guide, you must type something, and then press

the Return or Enter key. Do not press the Return or Enter key when an instruction

simply says “type.”

[Key] names Key names are written with brackets, such as [Return] or [Esc].

If you must press two or more keys simultaneously, the key names are linked with a

plus sign (+). Example:

Press [Ctrl]+[Alt]+[Del].

Letter in bold type Letters within a command that appear in bold type indicate the keyboard shortcut for a

command. When entering the command, you can use just the bolded letters instead of

the entire word.

Words in

italicized

type Italics emphasize a point or denote new terms at the place where they are defined in

the text.

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