Template:FAQ:Agent 06
From Net-SNMP Wiki
Unfortunately, simply installing the MIB file isn't enough for the agent to automatically provide the corresponding information. This typically requires writing some code. See the section CODING, and the on-line documentation.
It may sometimes be possible to achieve the same effect using the various extension directives, but this typically still involves providing a suitable script or command. The agent isn't magic and doesn't know how to locate the MIB information. Somebody has to tell it.