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<td bgcolor="#336666"><b><font face="Arial" size="2" color="#FFFFFF">6.2</b></font></td>
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<td bgcolor="#336666" width="100%"><strong><font size="2" color="#FFFFFF">
<span style="font-family: Arial">Network Management</span></font></strong></td>
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<td bgcolor="#669999" height="25"><b>
<font face="Arial" size="2" color="#FFFFFF">6.2.5</font></b></td>
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<font face="Arial" size="2" color="#FFFFFF">Structure of management
information and MIBs</font></strong></td>
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<font face="Arial" size="2"> A management information base (MIB) is
used to store the structured information representing network elements
and their attributes. The structure itself is defined in a standard
called the structure of management information (SMI), which defines
the data types that can be used to store an object, how those objects
are named, and how they are encoded for transmission over a network.
<img border="0" src="../../images/1.gif" align="absmiddle" width="12" height="12"></font><p>
<font face="Arial" size="2"> MIBs are highly structured depositories
for information about a device. Many standard MIBs exist, but more
MIBs that are proprietary exist to uniquely manage different vendor�s
devices. The original SMI MIB was categorized into eight different
groups, totaling 114 managed objects. More groups were added to define
MIB-II, which now replaces MIB-I.</font></p>
<p>
<font face="Arial" size="2">All managed objects in the SNMP
environment are arranged in a hierarchical or tree structure. The leaf
objects of the tree, which are the elements that appear at the bottom
of the diagram, are the actual managed objects. Each managed object
represents some resource, activity or related information that is to
be managed. A unique object identifier, which is a number in dot
notation, identifies each managed object. Each object identifier is
described using abstract syntax notation (ASN.1).
<img border="0" src="../../images/2.gif" align="absmiddle" width="12" height="12"></font></p>
<p>
<font face="Arial" size="2"> SNMP uses these object identifiers to
identify the MIB variables to retrieve or modify. Objects that are in
the public domain are described in MIBs introduced in Request for
Comments (RFCs). They are readily accessible at:
<a target="_blank" href="http://www.ietf.org">http://www.ietf.org</a></font></p>
<p>
<font face="Arial" size="2"> All vendors are encouraged to make their
MIB definitions known. Once an assigned enterprise value has been
given, the vendor is responsible for creating and maintaining
sub-trees.</font></p>
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