Allied Telesis AT-8900 SERIES User Manual download pdf

C613-16028-00 REV B

www.alliedtelesis.com

Best Practice |

Introduction

This How To Note describes techniques for on-site debugging. It is in no way intended to be

a comprehensive guide to debugging Allied Telesis equipment. Instead, it is aimed at passing

on some techniques that have been found to be useful. Particularly, this document describes

techniques which:

z make it less likely that you will miss important pieces of information

z make it simpler for someone else to analyse the debug information that you capture

z enable you to be more accurate in after-the-event discussions of what you saw.

Which products does it apply to?

This document applies to the following Allied Telesis routers and managed layer 3 switches:

z AR300, AR400, and AR700 series routers

z AT-8600, AT-8700XL, AT-8800, Rapier, and Rapier i series switches

z AT-9800 series switches

z AT-8900, AT-9900, and AT-9900s series switches

z x900 series switches

z SwitchBlade series switches

Related How To Notes

You also may find the following How To Notes useful, because they specifically discuss how to

debug connections:

z How To Troubleshoot ISDN Connections

z How To Troubleshoot VPNs

Note that many other How To Notes include troubleshooting information as well as

configuration examples.

How To Notes are available from www.alliedtelesis.com/resources/literature/howto.aspx.

On-Site Debugging

1 2 3 4 5

Summary of Contents

Page 1 - On-Site Debugging

C613-16028-00 REV Bwww.alliedtelesis.comBest Practice |IntroductionThis How To Note describes techniques for on-site debugging. It is in no way intend

Page 2 - Starting off

2Starting offWhen going on-site to investigate a network problem, your guiding aim is to understand the root cause of the problem, which might be:z a

Page 3 - Following up theories

3show ip countshow pim routeshow pim countshow pim neighbourand other commands relevant to the hardware forwarding of multicast in the particular mode

Page 4 - What counters are changing?

4All the way through the capture, type (just at the CLI prompt) what you are thinking, and what you are doing. Just write it as stream-of-consciousnes

Page 5 - Annotating afterwards

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