Troubleshooting Using a Subsystem Approach
Normal Router Startup Sequence
Troubleshooting the Power Subsystem
Troubleshooting the AC-Input Power Subsystem
Troubleshooting the DC-Input Power Subsystem
Troubleshooting a DC Power Module
Additional Power Subsystem Troubleshooting Information
Hardware and Software Identification
Obtaining Temperature and Environmental Information
Troubleshooting the Power Distribution System
Troubleshooting the Route Processor Subsystem
Ethernet Ports and Status LEDs
Monitoring Critical, Major, and Minor Alarm Status
Configuring and Troubleshooting Line Card Interfaces
Verifying the Transceiver Modules
Advanced Line Card Troubleshooting
Troubleshooting the Cooling Subsystem
Isolating Cooling Subsystem Problems
C H A P T E R 5
Replacing Cisco ASR 9001 Router Components
Cisco ASR 9001 and Cisco ASR 9001-S Routers Hardware Installation Guide
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Contents