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SN0051102-00 A 5-1
5 Diagnostics and
Troubleshooting
Diagnostic information about the router is available through the chassis LEDs and
the port LEDs. Diagnostic information is also available through the Router
Manager and CLI event logs and error displays. This section provides the
following diagnostic information:
Chassis Diagnostics (this page)
Power-On Self-Test Diagnostics (see page 5-2)
LED Blink Patterns (see page 5-3)
This section also describes how to use maintenance mode to recover a disabled
router (see page 5-5).
Chassis Diagnostics
The chassis LEDs show chassis diagnostics as shown in Figure 5-1.
Figure 5-1 Chassis Diagnostic LEDs
This section describes the following conditions:
Input Power LED is Off (see page 5-2)
System Fault LED is On (see page 5-2)