To configure snmp client version 3 on a Red Hat server you will need to install the packages net-snmp-utils and net-snmp.
yum install net-snmp-utils net-snmp
Make sure the snmpd service is stopped before you can configure it.
service snmpd stop
Create a new SNMPv3 user called “andrew”. The authentication password is “auth-pass” using MD5 for encryption, and the encryption key is “encryption-key” using DES.
net-snmp-create-v3-user -ro -A auth-pass -X encryption-key -a MD5 -x DES andrew
Start the snmpd service
service snmpd start
To ensure that the service is persistent after a reboot.
chkconfig snmpd on