NetSight is using mainly SNMP for managing switches. you need to configure NetSight to use the same SNMP credentials as your switch is configured. It depends on your XOS config. in general default XOS does have SNMPv2 "public" for reading and "private" for read/write.
configure the NetSight to use the same, establish IP/UDP connectivity between your switch and NetSight and you are good
🙂
Actual version of NetSight (Extreme Management Center) does have pre-configured SNMP profiles for XOS out-of-the-box.
Regards
Zdeněk Pala