ZyXEL Communications ZyWall ATP series - Make Sure Passive Device(Device 1) Sync Process Successfully; Configuration Changed Scenario

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After device 1 boot up, device 1 role will become to “Passive”.
Make sure passive device(Device 1) sync process successfully
After passive device boots up successfully, it will start to Device-HA Sync process.
You can use CLI command on passive device to make sure sync status.
Router> show device-ha2 sync status
Configuration changed scenario
In almost downgrading scenario, the configuration already been changed in
4.35 firmware. But old firmware may unable apply configuration successfully. So
we must compare 4.33 and 4.35 configuration together, and add the rules
manually after switched to 4.33 partition.
Note: There are 2 ways to force device sync configurations itself. It can start process but
just initial by different role.
On Active device: Router(config)# _device-ha2 send-sync all
On Passive device: Router> debug device-ha2 passive sync now