Figure 29: Control Board In A Qfxc08 Chassis - Juniper QFabric QFX3000-G Hardware Documentation

QFX3000-G QFabric System Hardware Documentation
54
The Control Boards install horizontally into the top rear of the chassis in slots labeled
and .
CB 0 CB 1

Figure 29: Control Board in a QFXC08 Chassis

Console Auxiliary
port
USB
port
Ejector levers
Control board
status LEDs
One Control Board functions as the master, and the other acts as the backup. If the
master Control Board fails or is removed, the backup Control Board takes over as the
master Control Board. When the Control Boards are configured for graceful switchover,
the backup Control Board automatically synchronizes its configuration and state with
those of the master Control Board. Any update to the master Control Board is replicated
on the backup Control Board. If the master Control Board fails, or mastership is switched
to the backup Control Board, packet forwarding stops on the QFXC08 chassis. When
the backup Control Board assumes mastership, packet forwarding continues through
the device.
If you need to replace the master Control Board, we recommend that you switch
mastership to the backup Control Board. We recommend that you always take a Control
Board offline before removing it. See
Interconnect Device" on page
The Control Board provides these functions:
Powers the 16-port QSFP+ front cards on and off
Powers the rear cards on and off
Performs routing functions for the device
Controls system resets and the boot sequence for the device
Monitors and controls the speed of the fans in the fan trays
Monitors and controls the LCD panel and chassis status LEDs
Monitors the communication of the 16-port QSFP+ front cards with the rear cards
Monitors the status of the power supplies
The Control Board has these components:
port
Management SFP
port ports
"Taking a Control Board Offline in a QFX3008-I
627.
Status and
Link/Activity LEDs
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