
This should give you an idea of how SNMPv3 works and how to configure it on your Cisco devices.
SNMP Concepts
SNMP is a protocol that operates at the application layer; it uses the default UDP port 161 for general SNMP messages and UDP port 162 for SNMP trap messages and it defines a method of communication between various networking devices and a central manager for use with the monitoring and management of these devices.
SNMP Versions
There...