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SNMP Protocol Overview, History and General Concepts
(Page 2 of 2)
SNMPv2 and the Division of SNMP into Protocol Operations and Transport Mappings
When SNMPv2 was created, the single
document describing the SNMP Protocol was split into two standards,
to make the protocol more modular and better reflective of the layers
used in internetworks. This division has been maintained in SNMPv3 as
well. The two types of documents specify the following:
- Protocol Operations: The first document
of the pair describes the actual mechanics by which MIB objects are
moved between SNMP devices using particular SNMP message types. In SNMPv3
it is RFC 3416, Version 2 of the Protocol Operations for the Simple
Network Management Protocol (SNMP). When people talk about just
the SNMP standard, this is the document they usually mean.
- Transport Mappings: The second document
details how the SNMP protocol operations described in the first standard
above can be transported over a variety of different protocol suites.
By using the correct mapping, SNMP operations can be carried out using
lower-layer technologies other than IP. This standard is represented
in SNMPv3 by RFC 3417, Transport Mappings for the Simple Network
Management Protocol (SNMP).
I discuss transport mappings in a
little more detail in the
topic on SNMP messaging, but since IP/UDP
is by far the most common transport mechanism, there isn't a great deal
to say about that aspect of the SNMP Protocol. The focus of most of
our look at SNMP will concentrate on SNMP protocol operations: what
messages are used, how they are structured and how they are exchanged.
In examining these messages we will see the two main ways that information
exchanges occur in SNMP (by polling and by interrupt) and also discover
how the SNMP Protocol works with MIB objects.
Key Concept: The actual mechanism used to communicate management information between network management stations and managed devices is called the Simple Network Management Protocol, which may be called the SNMP Protocol to differentiate it from the SNMP Framework. It consists of a number of protocol operations that describe the actual message exchanges that take place between devices, and a set of transport mappings that define how these messages are carried over various types of internetworks. The Internet Protocol is the most common transport mapping used for SNMP.
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The TCP/IP Guide (http://www.TCPIPGuide.com)
Version 3.0 - Version Date: September 20, 2005
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