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5 – Diagnostics and Troubleshooting
LED Blink Patterns
SN0051102-00 A 5-3
A
LED Blink Patterns
The heartbeat and system fault LEDs show the operational status of the router.
When the POST completes with no errors, the heartbeat LED will blink once every
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 Table 5-1.
Heartbeat Blink Pattern
A blink pattern on the heartbeat LED of one second ON followed by one second
OFF means that the router is operating normally. The heartbeat LED shows this
pattern when the router firmware is operational
.
System Error Blink Pattern
The system fault LED generates a three-blink pattern (once per second) followed
by a two second pause to indicate a system error.
Table 5-1. 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