Hi,
This is a very broad topic and Nagios is a pretty complex application. Are you already using Nagios to monitor other systems? The way you asked the question suggests you may be new to this.
On the Ruckus side, you'll need to enable SNMP, set the community string, etc, but most of the effort will be on the Nagios side. See the ZoneDirector User Guide for more info.
https://support.ruckuswireless.com/do....
-Keith