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TCP/IP MIB Modules and Object Groups
(Page 1 of 4)
Information Base (MIB) contains the collection
of MIB objects that describe the characteristics of a device using the
Standard Management Framework (SNMP Framework).
When SNMP was first created, there were not that many objects in the
MIB. Furthermore, they were mostly generic objects that
applied fairly universally to TCP/IP devices as a whole. In fact, most
of the MIB objects were variables related to the operation of TCP/IP
protocols such as IP, TCP and ICMP.
For this reason, at first, a single
document defined the Management Information Base (MIB) for
SNMP. The first of these documents was RFC 1066, part of the initial
SNMPv1 specification. It was then revised in RFC 1156. In RFC 1158,
a second version of the MIB, MIB II, was defined, which was essentially
the same but made a few changes.
The Organization of MIB Objects into Object Groups
The number of MIB objects defined
in these standards was relatively small. However, there were still several
dozen of them, and it was recognized from the start that more would
be created in time. To help organize the objects in a logical way, they
were arranged into object groups. These groups serve the purpose
of separating the objects and defining how they should be given object
identifiers in the overall object
Each group has associated with it
three important pieces of information:
- Group Name: A name that is used as a text
label in the object identification tree we saw in the previous topic.
These objects are all located within the iso.org.dod.internet.mgmt.mib
subtree. So for example, the group system would be iso.org.dod.internet.mgmt.mib.system.
- Group Number: A number corresponding to
the group name used for making numeric identifiers from the object name
tree. For example, the group system has the number 1, and so
the group's object identifier is 18.104.22.168.2.1.1. All objects in that
group will be under that tree; for example, sysUpTime is 22.214.171.124.126.96.36.199.
- Group Code: A text label that may be the
same as the group name or may be an abbreviation. It is used as a prefix
in making object descriptors (the text names of objects). For example,
for the group system the code is sys, and so an object
in this group is sysUpTime.
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The TCP/IP Guide (http://www.TCPIPGuide.com)
Version 3.0 - Version Date: September 20, 2005
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