A Maintenance window can be added at the System (Global) Level, or at the Network Level.
Note: You can now define a window for each activity that can be completed against a device, thus ensuring that only those activities can only be completed during that designated window.
To edit a scheduled maintenance window,
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From the menu bar, select Tools -> System Administration.
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Next, select Global -> Maintenance Windows.
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Click Edit.
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At the Maintenance Window, make any necessary edits.
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Click OK. The maintenance window closes, and the information is now stored within the Maintenance Windows.