Units of information used in SNMP.
Types
SNMPv3 defines 7 types of messages known as protocol data units (PDU).
GetRequest manager → agent: get value(s) of MIB object(s)
GetNextRequest manager → agent: get next MIB object in list/table
GetBulkRequest manager → agent: get large block of MIB data (e.g., table)
InformRequest manager → manager: inform remote manager of MIB values
SetRequest manager → agent: set value(s) of MIB object(s)
Response agent → manager or manager → manager: auto-reply to requests/informs
SNMPv2-Trap agent → manager: inform of exceptional event
Structure
