
Appendix B Troubleshooting Initial Startup Problems
General Troubleshooting Tips
Troubleshooting Using a Subsystem Approach
To solve a system problem, try to isolate the problem to a specific subsystem. Compare current router behavior with expected router behavior. Because a startup issue is usually attributable to one component, it is most efficient to examine each subsystem, rather than trying to troubleshoot each router component.
For troubleshooting purposes in this chapter, the router consists of the following subsystems:
•Power
–
•Processor
•Cooling
Normal Router Startup Sequence
You can generally determine when and where the power supply failed during the startup sequence by checking the status LEDs on the power supply modules.
In a normal router startup sequence, the following sequence of events and conditions occur:
1.The fan in each PEM receives power and begins drawing air through the power supply. The power supply PWR OK indicator is on and reflects power supply status.
2.As the power on and boot process progresses for the Cisco ASR 1000 Series RP1, ASR1000 ESPs, and each installed SIP, the status of each card is indicated by LEDs.
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