Before you start, make sure that you have SNMP V3 already setup on your device. You can refer to this post if you need to set it up.
Add the device to Zenoss, and then edit the devices Configuration Properties, you’ll need to configure the following settings.
Zenoss setting name Options
zSnmpPrivType (AES or DES)
zSnmpAuthType (MD5 or SHA)
After all the above changes are made, Zenoss should start graphing the device.
The chart below shows which snmpwalk options match which Zenoss Configuration Properties.
snmpwalk Zenoss Configuration snmpd.conf
-v zSnmpVers n/a
-u zSnmpSecurityName createUser [user]
-x zSnmpPrivType (AES or DES)
-X zSnmpPrivPassword PASSPHRASE
-a zSnmpAuthType (MD5 or SHA)
-A zSnmpAuthPassword PASSPHRASE
You can refer to the Zenoss wiki for more info.