Switching Control Board Mastership ! 565
Chapter 42: Monitoring Redundant Control Boards
Step 2: Check the Redundant Control Board Status from the Craft Interface
Action If you are near the router, physically look at the craft interface for the Control Board
LEDs. To display redundant Control Board status from the craft interface, use the
following CLI command:
user@host> show chassis craft-interface
Sample Output
t640@host>
show chassis craft-interface
FPM Display contents:
[...Output truncated...}
CB LEDs:
CB 0 1
--------------
Amber .
Green *
Blue *
[...Output truncated...]
What It Means The CB LEDs section of the command output indicates the status of the redundant
Control Board. An asterisk (*) indicates the current operating state:
Amber (offline),
Green (online), and Blue (Master). In the above output, no redundant Control Board
is installed—the output under
CB1 is blank.
Step 3: Check the Redundant Control Board LED Status
Action To check the redundant Control Board LED status, look at the three LEDs located on
the Control Board faceplate. Table 120 describes the Control Board LED states.
Table 120: Control Board LEDs
Switching Control Board Mastership
Action To switch the Control Board master to backup or the Control Board backup to
master, take the Control Board offline by pressing the Control Board offline button
on the component faceplate. The backup Control Board will automatically start up.
To remove the Control Board, see “Replacing a Control Board” on page 566.
Checking the Control Board Alarms
Action To check for the Control Board alarms, see “Checking the Control Board Alarms” on
page 308. For conditions that trigger Control Board alarms, see “Display the Current
Router Alarms” on page 61.
Label Color State Description
OK Green On steadily Control Board is online and is
functioning normally.
FAIL Amber On steadily Control Board has failed.
MASTER Blue On steadily Control Board is functioning as master.
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