There are several ways to enable SNMP on IOS APs:
1. AMP can do it automatically if you have the Enable SNMP option set on the Device Setup -> Communication page.
2. From an AP's web interface go to Services -> SNMP and be sure that these two things are true:
- SNMP is enabled
- Your SNMP user has its Object Identifier set to iso.
3. From the AMP cli:
snmp-server view iso iso included
snmp-server community public view iso RO
Note that you can change the community string to a read/write string (usually 'private') and specify 'RW' instead of 'RO' at the end of the command. In addition, if you use custom public/private strings, include these in the command instead of the default 'public' or 'private' strings.
Note: If you are running 12.4 train of IOS for 12XX series APs, native VLAN should be up for SNMP to work. BVI can only be on native VLAN.