Automated image sync

In a VSF environment, all stack members run the same software image. If the user upgrades the software on the Master by downloading a new software image using SFTP/TFTP, all members of the stack will simultaneously upgrade.

形成一个堆栈时,如果软件版本上member is different from the version of the Master, the member will automatically update itself to the same version as the Master. The member will reboot itself to run the updated version before joining the stack.