Was playing with this on my home lab with v8.3 reading SNMP v2c to a Cisco Catalyst 3750X-48P and in testing I was reading a few ports data, but then decided to add all 48 ports and that's where I hit the following error and now no data from that switch will update with that many ports attempting to read:
GET failed with errorStatusText: PDU encoding too big
I'm pulling in a mix of strings (port name, description/alias), counters (64-bit), and integers.