3Com Switch 7750 Configuration Guide

568 CHAPTER 53: HA CONFIGURATION
HA Configuration
HA Configuration
Overview
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■ When the Switch 7758 starts, if you log in to the slave module, it will take
about 3 minutes before you can see the system prompt. During the 3 minutes,
the slave module does not response to any operation. This is system protective
design for avoiding switching shake.
■ You cannot execute any command on the slave module until the slave module
switches over to the master.
■ The master module will batch backup the configuration to slave module as
soon as the system is up, which is a quick action. During this action, the system
will give prompt on both master module and slave module if you press the
“enter” key on the terminal, at the time, you cannot execute any command on
the master module. After the batch backup, the master module keeps doing
the real-time backup to the slave and you can execute all commands on the
master module.
■ You must keep the consistency of the version of the master and slave module.
Setting the Slave
Module Restart
Manually
When the slave module works normally, you can set the slave system restart
manually.
Perform the following configuration in user view.
Performing the
Master-Slave Switchover
Manually
When the slave module is available and the master is in real-time backup state,
you can inform the slave module of a master-slave switchover by using a
command if you expect the slave module to operate in place of the master
module. After the switchover, the slave module will control the system and the
original master module will reset automatically.
Perform the following configuration in user view.
Table 438 HA configuration tasks overview
Configuration Description Related section
Set the slave module restart
manually
Required “Setting the Slave Module
Restart Manually” on page 568
Perform the master-slave
switchover manually
Required “Performing the Master-Slave
Switchover Manually” on page
568
Enable automatic synchronization Required “Enabling Automatic
Synchronization” on page 569
Synchronize the configuration file
of the system manually.
Required “Synchronizing the
Configuration File of the
System Manually” on page 569
Table 439 Set slave module restart manually
Operation Command Description
Set slave module restart manually slave restart Optional