Troubleshooting guide

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ATM and Layer 3 Switch Router Troubleshooting Guide

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APPENDIX

ATM and Layer 3 Technical Tips

This appendix provides additional information that you might need when troubleshooting your ATM

switch router.

This appendix includes the following sections:

• Accessing ATM Technical Tips Using Cisco.com Online, page E-1

• Understanding show controllers Command Output, page E-2

• Architecture Problems, page E-4

Accessing ATM Technical Tips Using Cisco.com Online

Cisco.com provides access to online technical information service, including Cisco's internal service

databases.Cisco.com provides you with up-to-date information, with hundreds of new documents being

added or updated each month.

To access “Technical Assistance Center” (TAC), and specific ATM information, perform the following

steps:

Step 1 If you are not already logged in to Cisco.com, enter your user name and password at the login prompt.

Step 2 Under “Service & Support, select “Technical Support Help -- Cisco TAC.” This opens the “Technical

Assistance Center” (TAC) web page.

Step 3 From the left menu bar, under “Browse...”, select the “Technical Tips” button.

Step 4 From the list of tips that appears, select “AT M”.

Step 5 The “ATM Technical Tips” page appears.

This page provides tips directly from Cisco's Technical Assistance Center (TAC) engineers, to help you

with ATM issues.

Select a few of the links and note the depth of the information that is provided. For example, select the

link Troubleshooting IP over ATM PVC Connectivity link. It provides an overview of the address

resolution and packet encapsulation methods used on ATM networks. It also provides troubleshooting

steps to use if you are unable to ping across an ATM cloud when enabling a new permanent virtual circuit

(PVC).