I wrote some SNMP modules while working at Motorola. The modules let you send in raw network data and it would translate it into an SNMP message object, along with a decent API for accessing the data. It was extendable enough to support any SNMP message format, including the volatile SNMP 3 standard. (Sorry I had to rewrite the wheel, but I couldn't find an SNMP package that let another do the network connection management-- we needed a program that select()ed on multiple connections, some of which were SNMP and others using other protocols).

The downside is that I didn't think of submitting the module to CPAN, to technically it's still Motorola property and I you probably couldn't get your hands on it unless you worked for them. Of course, you're probably only interested in that module if you wanted to mix SNMP with other protocols at the same time. It sounds like some of the other CPAN modules would suit you better. If you're still interested, let me know and I'll see what I can get my hands on...

-Ted