Installation guide

6–Diagnostics and Troubleshooting
Power-On Self-Test Diagnostics
6-2 ISR651101-00 C
 Yes—Make necessary corrections or repairs. If the condition remains,
continue.
 No—Continue.
 Inspect AC power source. Is the power source delivering the proper
voltage?
 Yes—Continue.
 No—Make the necessary repairs. If the condition remains, continue.
 Replace the router.
System Fault LED is On
The System fault LED blinks a specific pattern to indicate the problem. If the
system fault LED lights up, take necessary actions (see page 6-2).
Power-On Self-Test Diagnostics
The router performs a series of tests as part of its power-on procedure. The POST
diagnostic program performs the following tests:
 Memory
 FLASH validation
 PCI device discovery
 Management Ethernet port
LED Blink Patterns
The heartbeat and system fault LEDs show the operational status of the router.
When the POST completes with no errors, these LEDs blink at a steady rate of
once per second. When the router is in maintenance mode, the heartbeat and
system fault LEDs are on continuously.
All other
system fault blink patterns show critical errors. The heartbeat LED shows
an error blink pattern for the conditions listed in Ta b l e 6- 1 .
Table 6-1. System Fault LED Blink Patterns
System Fault LED Condition
OFF OK - Operational
3 Blinks, followed by pause System error
4 Blinks, followed by pause Management port IP address conflict
5 Blinks, followed by pause Over temperature