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DES-7200 Configuration Guide Chapter 10 Redundancy Configuration for Management
Module
10-7
Caution
During the normal operation of the switch, the parameters must be
saved when the configurations are done; otherwise, the configuration
will be lost in case of master/salve switchover.
During the startup of the device inserted with two the management
modules, if the main program of any the management module is
incomplete or absent, the switch cannot start. The symptom is that the
two boards restart repeatedly or suspend during the startup process.
During the startup of the device inserted with one the management
module, if the management module with incomplete or absent CTRL
program or main program is inserted before the success of the startup,
the switch also cannot start.
In the above two case, remove the faulty the management modules. If
the device is still abnormal, power off the switch and restart it.
During the batch backup of master and the slave management module,
do not unplug the master one, or it will lead to data flow breakoff due to
system reset. If the software of dual the management modules are
abnormal during the period of batch backup, it will also lead to data
flow breakoff due to system reset.
Please unplug one of the dual the management modules quickly if you
want to unplug one of them when they are working simultaneously.
Slow unplugging may make the management module work abnormally.
Please make sure that the management module is plugged tightly and
the screw id tightened.
10.2.1.2 Manual selection of the master
management module
The DES-7200 series switch supports dual the management modules. You may select
the master and the slave management modules by using the commands available in
CLI.
In the privileged user mode, execute the following commands to forcibly switch over
the the master management module:
Command Meaning
redundancy force-switchover switch
This command is executed immediately without
the necessity for global configuration mode.
For example, the current the master management module is the one in slot M1. When
the following commands are executed, the the management module will be switched
over to the the slave management module, and the one in slot M2 becomes the
master.
DES-7200# redundancy force-switchover switch