• Check the host subsystem LEDs on the craft interface. If the green MASTER LED is
lit, the corresponding host subsystem is functioning as master.
• Display which host subsystem is functioning as master, using the following
command:
user@host> show chassis routing-engine
2. If the host subsystem is functioning as master, switch it to backup, using the following
command:
user@host> request chassis routing-engine master switch
When you switch the host subsystem from master to backup, the functioning of the
router is interrupted for up to several minutes as the system reboots and the new
master host subsystem downloads software to the SIBs.
3. Have ready an antistatic mat, placed on a flat, stable surface.
4. Attach an electrostatic discharge (ESD) strap to your bare wrist, and connect the
strap to one of the ESD points on the chassis.
5. Loosen the captive screws on the ejector handles on both sides of the Control Board
faceplate.
6. Flip the ejector handles outwards to unseat the Control Board.
7. Grasp the ejector handles and slide the Control Board about halfway out of the chassis.
8. Move one of your hands underneath the Control Board to support it, and slide it
completely out of the chassis.
9. Remove the replacement Control Board from its electrostatic bag.
10. Carefully align the sides of the Control Board with the guides inside the chassis.
11. Slide the Control Board all the way into the chassis.
12. Grasp both ejector handles and press them inwards to seat the Control Board.
13. Tighten the captive screws on the ejector handles.
14. To bring the Control Board online, press the online/offline button until the green
ONLINE LED lights.
Display the Control Board Hardware Information
Purpose To display the Control Board hardware information.
Action To display the Control Board hardware information, use the following command:
user@host> show chassis hardware
Sample Output
t640@host> show chassis hardware
Hardware inventory:
Item Version Part number Serial number Description
Chassis 65565 M320
Midplane REV 05 710-009120 RB0662 M320 Midplane
395Copyright © 2012, Juniper Networks, Inc.
Chapter 14: Monitoring Control Boards
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