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DES-7200 Configuration Guide Chapter 10 Redundancy Configuration for Management
Module
10-6
z Manual selection of the master management module
10.2.1.1 Automatic selection of the
master management module
You can plug or unplug the the management modules while the switch is working.
Based on the current conditions, the switch automatically selects an engine for its
operation without normal data switching. In case of any conditions below during you
use, the the master management module will be selected accordingly:
z If only one the management module is plugged when the switch is started up, the
switch will select it as the the master management module no matter whether it is
in slot M1 or M2.
z If both the management modules are plugged when the switch is started up, by
default, the one in slot M1 will be selected as the master and the one in slot M2 as
the slave for purpose of redundancy. Related prompt message will be provided.
z If only one the management module is plugged when the switch is started up, and
the other the management module is plugged while the switch is in normal
operation, the latter will be regarded as the the slave management module for
purpose of redundancy, no matter whether it is slot M1 or M2. Related prompt
message will be provided.
z If both the management modules are plugged when the switch is started up, and
one of them is unplugged while the switch is in normal operation (or one becomes
abnormal): if the unplugged the management module is the slave before it is
unplugged (or abnormal), the switch only prompts that the the slave management
module is unplugged (or becomes abnormal); if the unplugged the management
module is the master before it is unplugged (or abnormal), the other the
management module will turn from slave to master, and related prompt will be
provided.