SNMPv3 is the most advanced and secure version of SNMP yet, with features like user authentication and encryption greatly enhancing the protocol.
The following instructions will show you how to configure SNMP v3 with authentication and privacy on Cisco switching using MD5 and DES;
conf t
snmp-server group <snmp group name> v3 auth
snmp-server user <snmp user name> <snmp group name> v3 auth md5 <auth password> priv des <priv password>
end