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MIBs
are a collection of information organized hierarchically which define the
properties of the managed object within the device to be managed (such as a
router, switch, etc.)
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Each
managed device keeps a database of values for each of the definitions written
in the MIB. As such, it is not actually database but implementation dependant.
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Each
vendor of SNMP equipment has an exclusive section of the MIB tree structure under
their control and these are accessed using a protocol such as SNMP.
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There
are two types of MIBs: scalar and tabular.
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Scalar
objects define a single object instance whereas tabular objects define multiple
related object instances grouped in MIB tables. The following keywords are used
to define a MIB object:
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Syntax: - Defines the
abstract data structure corresponding to the object type. The SMI purposely
restricts the ASN.1 constructs that can be used to promote simplicity.
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Access: - Defines
whether the object value may only be retrieved but not modified (readonly) or
whether it may also be modified (read-write).
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Description: - Contains a
textual definition of the object type. The definition provides all semantic
definitions necessary for interpretation; it typically contains information of
the sort that would be communicated in any ASN.1 commentary annotations
associated with the object.
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