568 CHAPTER 53: HA C ONFIGURATIONHA ConfigurationHA ConfigurationOverviewn ■ When the Switch 7758 starts, if you log in to the slave module, it will takeabout 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 protectivedesign for avoiding switching shake.■ You cannot execute any command on the slave module until the slave moduleswitches over to the master.■ The master module will batch backup the configuration to slave module assoon as the system is up, which is a quick action. During this action, the systemwill 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 onthe master module. After the batch backup, the master module keeps doingthe real-time backup to the slave and you can execute all commands on themaster module.■ You must keep the consistency of the version of the master and slave module.Setting the SlaveModule RestartManuallyWhen the slave module works normally, you can set the slave system restartmanually.Perform the following configuration in user view.Performing theMaster-Slave SwitchoverManuallyWhen 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 acommand if you expect the slave module to operate in place of the mastermodule. After the switchover, the slave module will control the system and theoriginal master module will reset automatically.Perform the following configuration in user view.Table 438 HA configuration tasks overviewConfiguration Description Related sectionSet the slave module restartmanuallyRequired “Setting the Slave ModuleRestart Manually” on page 568Perform the master-slaveswitchover manuallyRequired “Performing the Master-SlaveSwitchover Manually” on page568Enable automatic synchronization Required “Enabling AutomaticSynchronization” on page 569Synchronize the configuration fileof the system manually.Required “Synchronizing theConfiguration File of theSystem Manually” on page 569Table 439 Set slave module restart manuallyOperation Command DescriptionSet slave module restart manually slave restart Optional
