About This Guide

 Audience ix

 PortMaster Documentation ix

 Additional References x

 RFCs x

 Books xii

 Document Conventions xii

 Document Advisories xiii

 Contacting Lucent InterNetworking Systems Technical Support xiv

 For the EMEA Region xiv

 For North America, Latin America, and the Asia Pacific Region xiv

 PortMaster Training Courses xv

 Subscribing to PortMaster Mailing Lists xv

1. Solving Hardware Problems

 Diagnosing Synchronous and Asynchronous Port Problems 1-2

 Displaying Port Errors and Status 1-2

 Diagnosing Line Errors 1-4

 Verifying Port State for Old and New Cards 1-6

 Disabling a Synchronous Hardwired Port 1-6

 Diagnosing Ethernet Port Problems 1-7

 DIP Switch Position 1-8

 Diagnosing Faulty Ethernet Hardware 1-9

 Checking 10BaseT (RJ-45, Twisted Pair) Hardware 1-10

 Checking BNC (10Base2, Coaxial, Thinnet) Hardware 1-11

 Checking AUI (10Base5, Ethernet D, Thicknet) Hardware 1-11

 Diagnosing an Overloaded Ethernet Network 1-12

 Diagnosing Ethernet Daughterboard Problems 1-14

2. Solving Administrative Problems

 Erasing the NVRAM, ComOS, or the Configuration 2-2

 Reasons for Erasing and/or Reformatting NVRAM 2-3

 Resetting the Configuration to Factory Defaults 2-4

 Erasing and Reloading ComOS 2-5

 Erasing ComOS and the Configuration 2-6

 Netbooting 2-7

 Accessing the Lucent InterNetworking Systems FTP Site 2-9

 Netbooting with a Network Connection 2-11

 Booting from PROM (Booting without a Network Connection) 2-13

 Installing a New ComOS Using pminstall 2-16

 Preparing the PortMaster for Operation 2-18

 Troubleshooting Netbooting 2-18

 Replacing Forgotten Passwords 2-20

 Diagnosing Authentication Problems 2-21

3. Solving Networking Problems

 Using Console Messages to Troubleshoot 3-3

 Using Administrative Telnet Sessions 3-4

 Establishing a Telnet Session 3-4

 Displaying Console Messages 3-5

 Troubleshooting the Session 3-5

 Determining the ComOS Version 3-8

 Verifying Network Connections 3-9

 Using ifconfig 3-10

 Verifying the PortMaster's Configuration 3-10

 Temporarily Changing the Configuration 3-12

 Displaying Network Statistics 3-12

 Tracing Packets 3-12

 Filtering Telnet Traffic for ptrace 3-13

 Tracing IP Packets 3-14

 Tracing DNS Packets 3-15

 Tracing IPX Packets 3-16

 Tracing TCP Packets 3-16

 Tracing UDP Packets 3-17

 Tracing Ping Packets 3-18

 Tracing RIP Packets 3-19

 Troubleshooting Routing 3-19

 Locating an Incorrect Static Route 3-20

 Tracing a Route 3-21

 Finding a Particular Route 3-22

4. Solving PPP Problems

 Debugging and Interpreting PPP Negotiation 4-2

 Diagnosing Multichassis PPP Problems 4-5

 Endpoint Discriminator Misconfiguration 4-6

 Dial-In Problems with Multichassis PPP 4-7

 Troubleshooting Compression 4-10

5. Solving ISDN Problems

 Troubleshooting an ISDN BRI Connection 5-2

 Verifying LEDs 5-2

 Checking the Physical Interface with show isdn 5-3

 Troubleshooting an ISDN PRI Connection 5-5

 Establishing Synchronization for an ISDN PRI Connection 5-6

 Resetting a PRI Connection at the Switch 5-8

 Interpreting Send and Receive Patterns 5-8

 Using Debug ISDN Commands 5-9

6. Solving Frame Relay Problems

 Preliminary Frame Relay Troubleshooting 6-2

 Diagnosing Frame Relay Routing Problems 6-3

 Monitoring LMI or Annex-D Packets 6-4

 Diagnosing Frame Relay Problems with the DLCI List 6-5

 Getting the DLCI List from the Telephone Company 6-6

 Getting the DLCI List from set debug 0x51 Output 6-6

 Diagnosing Frame Relay Problems with ifconfig 6-8

 Diagnosing an Inactive Frame Relay Connection 6-8

 Determining Why You Cannot Ping Other Frame Relay Nodes 6-10

 IPX and Frame Relay 6-11

 Diagnosing Subinterface Problems 6-12

A. ISDN Cause Codes

B. PPP Packet Formats

 Formats for LCP Packets B-2

 LCP Packet Formats B-2

 LCP Configuration Options B-3

 IPCP Configuration Options B-4

 PAP Packet Formats B-5

 CHAP Packet Formats B-5

 Formats for IPXCP Packets B-6

 IPXCP Packet Formats B-6

 IPXCP Configuration Options B-7

 Formats for CCP Packets B-8

 CCP Packet Formats B-8

 CCP Configuration Options B-8

C. Termination Causes

 Glossary

 Subject Index

 Command Index