v3 snmp and cacti

Hi,

I have problem. I have ~80 rb532 and some other mt router (x86) and i need to monitor signal strengts etc. in 2.9 signal strenght oid like this oidnumberbase . mac_address . interface_index. This is cannot handle normal (templated) way because interface index can represent some value alone and in registration table combined with mac_address. To complex to handle it.
You wrote snmp changed in v3.x. this changes can be explain detailed?
Thanks