Allied Telesis AT-S21 - Manual (Page 73)

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Menu: Administration>Broadcast updated software
to all systems
Plan a software broadcast update during times when your network is
not busy.
1. Select System administration>Broadcast updated
software to all systems .
The switch announces the availability of the software to all
switches belonging to the same series; in turn, the switches
that need the upgrade respond by sending back a “request”
message.
The screen immediately turns on the Activity Monitor
screen and displays the information as switches on the
network request and then receive the software.
Note
You cannot undo this command once executed.
You may go to menus without interrupting the software
download.
If you have many switches requesting the download, not all of them
may receive it especially if the network is busy. Repeat the procedure
to ensure all switches receive the software upgrade.
Note
Switches with different download passwords will not receive the
software download.