SNMPv2 messages are sent using DDP protocol type 8. SNMPv2 entities acting in an agent role listens on DDP socket number 8, whilst notification sinks listen on DDP socket number 9.
Administrators must configure their SNMPv2 entities acting in an agent role to use NBP type "SNMP Agent" (which consists of ten ASCII characters), whilst notification sinks must be configured to use NBP type "SNMP Trap Handler" (which consists of seventeen ASCII characters).
The NBP name for agents and notification sinks should be stable - NBP names should not change any more often than the IP address of a typical TCP/IP node. It is suggested that the NBP name be stored in some form of stable storage.
When an SNMPv2 entity uses this transport mapping, it must be capable of accepting messages that are at least 484 octets in size. Implementation of larger values is encouraged whenever possible.