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SNMP Protocol Messaging and Message Formats
As we saw extensively in the
previous section, the communication of
management information is accomplished through the exchange of SNMP
messages that contain protocol data units (PDUs). Like the messages
of most TCP/IP protocols, these PDUs are designed to use a particular
field format, and are created, addressed and transported according to
specific protocol rules. SNMP messages include fields that control the
operation of the protocol, and carry a payload of management
information in the form of Management
Information Base (MIB) objects.
In this section I describe the details
of how messaging is accomplished in the SNMP Protocol. I begin with
a general discussion of issues related to message generation, addressing
and transport, and a description of how retransmission of messages is
handled when necessary. I discuss the way fields are defined in SNMP
messages and describe their general format, explaining the difference
between the overall message and the PDU it contains. I then examine
the message format used in all of the important SNMP versions, showing
the structure of each message type and the fields used.
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The TCP/IP Guide (http://www.TCPIPGuide.com)
Version 3.0 - Version Date: September 20, 2005
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