MIBs are used by Zenoss as a way to convert trap output from numeric OIDs to named OIDs. Once you add the MIB it should be easy to point your device's trapsink to the Zenoss server and from the Zenoss server convert the traps into Zenoss events.
The AIX MIB which is stored in the /usr/lib/samples/snmp/aix.my
MIB file on any AIX server. Copy the MIB file to your Zenoss server and add it with the command:
zenmib run $ZENHOME/share/mibs/site/aix.my
Verify that the MIB is in the management page at: