Troubleshooting guide

Contents
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ATM and Layer 3 Switch Router Troubleshooting Guide
OL-1969-01
Physical Connections 4-3
Virtual Connections 4-4
Example Mixed ATM and Layer 3 Network 4-10
Physical Connections 4-10
Virtual Connections 4-10
CHAPTER 5 Troubleshooting Switch Router ATM Interface Connections 5-1
Performing Basic Interface Checks 5-1
Checking Cell Rates 5-3
Determining Network Connectivity 5-5
Performing OAM Loopback Tests 5-6
OAM Operation 5-6
OAM Loopback Testing 5-9
Configuring Loopback Examples 5-10
Test 1—Segment Network-Side Loopback Process 5-11
Test 2—Segment Link-Side Loopback Process 5-11
Test 3—End-to-End Loopback Process 5-12
Common show controller Troubleshooting Fields 5-12
Port Status and Active Defects 5-15
Line Coding Errors 5-17
Using the debug Commands to Troubleshoot an Interface 5-19
Troubleshooting 155-Mbps and 622-Mbps Interfaces 5-20
Port Adapter LEDs 5-20
Displaying Interface Port Configuration 5-21
Troubleshooting OC-3c, OC-12c, and OC-48c Interfaces 5-26
Interface Module LEDs 5-26
Displaying Interface Port Configuration 5-27
Troubleshooting T1 and E1 Interfaces 5-32
Port Adapter LEDs 5-32
Displaying Interface Port Configuration 5-32
Troubleshooting DS3 and E3 Interfaces 5-38
Port Adapter LEDs 5-39
Displaying Interface Port Configuration 5-40
Troubleshooting CES T1 and CES E1 Interfaces 5-46
Port Adapter LEDs 5-47
Displaying Interface Port Configuration 5-47
Troubleshooting 25-Mbps Interfaces 5-50
Port Adapter LEDs 5-50