The Simple Network Management Protocol (SNMP) version three (SNMPv3)
requires that an application know the identifier (snmpEngineID) of
the remote SNMP protocol engine in order to retrieve or manipulate
objects maintained on the remote SNMP entity.

This document introduces a well-known localEngineID and a discovery
mechanism that can be used to learn the snmpEngineID of a remote SNMP
protocol engine. The proposed mechanism is independent of the
features provided by SNMP security models and may also be used by
other protocol interfaces providing access to managed objects.
This document updates RFC 3411.