Troubleshooting the line cards – Cisco XR 12406 User Manual
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Chapter 4 Troubleshooting the Installation
Troubleshooting the Processor Subsystem
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Cisco XR 12406 Router Installation Guide
OL-13831-01
Troubleshooting the Line Cards
As each line card powers up, a power-on self-test (POST) is performed on the line
card memory. A full set of field diagnostics can also be run on a line card from
the system console, providing a pass/fail message both in the line card
alphanumeric LED display and on the system console.
To help isolate a problem with a line card, visually check the two alphanumeric
LED displays.
•
Are both alphanumeric LED displays on?
The two displays are powered separately. The left display receives power
from the DC-DC converter on the line card. The right display is powered
directly from the backplane. Therefore, even if the line card has not powered
up, the right display could be on.
•
If both displays are off:
–
The line card may not be fully seated into the backplane connector.
–
There may be a problem with the MBus module on the line card.
–
The system power could be off.
•
If both displays are on:
–
Check the message being displayed. As soon as the DC-DC converter is
turned on by the MBus module, the processor on the line card begins the
boot process. Status messages are displayed in the alphanumeric displays
as the boot process continues on the line card.
The system attempts to boot identical line cards in parallel. In addition, the system
boots line cards as soon as they are powered on and become available for backup.
During the line card boot process, which occurs immediately after the RP boot
process, you can observe the alphanumeric LED displays on each line card