3Com Switch 7750 Configuration Guide Guide

542 CHAPTER 51: HA CONFIGURATION
HA Configuration
HA Configuration
Overview
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■ When the Switch 7758 starts, if you log in to the slave board, it will take about
3 minutes before you can see the system prompt. During the 3 minutes, the
slave board does not response to any operation. This is system protective
design for avoiding switching shake.
■ You cannot execute any command on the slave board until the slave board
switches over to the master.
■ The master board will batch backup the configuration to slave board as soon as
the system is up, which is a quick action. During this action, the system will
give prompt on both master board and slave board if you press the "enter" key
on the terminal, at the time, you cannot execute any command on the master
board. After the batch backup, the master board keeps doing the real-time
backup to the slave and you can execute all commands on the master board.
■ You must keep the consistency of the version of the master and slave board.
Setting the Slave Board
Restart Manually
When the slave board 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 board is available and the master is in real-time backup state, you
can inform the slave board of a master-slave switchover by using a command if
you expect the slave board to operate in place of the master board. After the
switchover, the slave board will control the system and the original master board
will reset automatically.
Perform the following configuration in user view.
Tabl e 409 HA configuration tasks overview
Configuration Description Related section
Set the slave board restart
manually
Required
“Setting the Slave Board
Restart Manually”
Perform the master-slave
switchover manually
Required
“Performing the Master-Slave
Switchover Manually”
Enable automatic
synchronization
Required
“Enabling Automatic
Synchronization”
Synchronize the configuration
file of the system manually.
Required
“Synchronizing the
Configuration File of the
System Manually”
Tabl e 410 Set slave board restart manually
Operation Command Description
Set slave board restart
manually
slave restart Optional