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Troubleshooting the T4000 Host Subsystems

 

Problem:

Description:

The following alarms and LEDs indicate a problem with a host subsystem control board and Routing Engine:

  • The red host subsystem FAIL LED on the craft interface is lit.

  • The green host subsystem OK LED on the craft interface is not lit.

  • A red alarm indicates that the host subsystem has been removed.

  • A yellow alarm indicates that the host subsystem has failed.

In Table 1, the text in the column labeled ”LCD Message” appears in the display of the craft interface. The text in the column labeled “CLI Message” appears in the output from the show chassis alarms command.

Table 1: Chassis Alarm Messages for Host Subsystems

Alarm Type

LCD Message

CLI Message

Red

Host host-number Removed

Host host-number Removed

Yellow

Host host-number Failure

Host host-number Failure

Solution

To troubleshoot the host subsystems:

  1. Check the LEDs on the faceplate of each control board and Routing Engine.
  2. Check the LEDs on the craft interface.
  3. If the red HOST0 FAIL or HOST1 FAIL LED is lit on the craft interface, look at the LCD
  4. Use the show chassis alarms command to check for alarms.