Troubleshooting the T640 Host Subsystem

Problem

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

• 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 subystem has failed.

Solution

1. Check the LEDs on the faceplate of each control board and Routing engine.
2. Check the LEDs on the craft interface.
3. Use the CLI to check for alarms.
   • Standalone T640 router—Issue the show chassis alarms command to view the alarms.
   • T640 router in a routing matrix—Issue the show chassis alarms lcc lcc-number command to view the alarms.

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.