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2-8 Preliminary May 9, 2000 APX 8000/MAX TNT/DSLTNT Physical Interface Configuration Guide
Configuring Shelf-Controller Redundancy (APX 8000)
Configuring the APX 8000 for shelf-controller redundancy
Switching the primary controller at the command-line interface
You can manually switch primary shelf-controller functionality to the secondary controller by
entering the command redundant-controller-switch at the command-line interface.
This command causes the primary controller to give up bus (slot card) ownership and allow the
other controller to become primary. The switchover to the secondary controller occur only if
the secondary controller is present. After the bus is released, the old primary shelf controller
reboots and assumes the role of secondary controller.
Switchover takes place only if the following conditions are met:
• The secondary controller is present.
• The primary controller currently controls the bus.
• The secondary controller requests control of the bus, which is the normal operating state
of the secondary controller. The secondary controller is ready to automatically gain bus
ownership whenever the primary releases its ownership.
After you use the redundant-controller-switch command, a prompt appears that
asks for confirmation of your request. To switch primary controller functionality to the
secondary controller without being prompted for confirmation, use the -f command option, as
follows:
admin> redundant-controller-switch -f
When the command is entered on the primary controller, controller functionality is switched to
the secondary controller. When the switchover command is entered on the secondary
controller, no switchover occurs.
If the switchover command is entered on the primary when the secondary is not requesting
control of the bus, no switchover occurs:
admin> redundant-controller-switch
The remote controller is not requesting the bus,
it cannot become PRIMARY!
If the switchover command is entered on the primary controller when only one controller is
present, a notice is displayed:
admin> redundant-controller-switch
There is no remote controller!
Resetting shelf controllers and clearing controller NVRAM
The shelf controllers can be reset from the command line with the reset command. The
controller’s NVRAM can be cleared from the command line with the nvram command. The
use of these commands is described in this section.
Refer to the APX 8000/MAX TNT/DSLTNT Reference for additional information on the reset
and nvram command-line interface commands and command options.
Resetting the controllers
The reset command resets one or both APX 8000 redundant shelf controllers. When you
reset the unit, it restarts, and all active connections are terminated. All users are logged out, and