1.1.4 What is a MIB?

A MIB is a Management Information Base that resides on a managed node. The MIB definition sets the limits on what can be managed. The MIB defines

• Which variables or parameters will be accessed
• How each value will be identified
• How each value will be encoded
• How each value will be interpreted

A MIB contains objects (units of management information) divided into scalars and tables, which are identified by object identifiers (OIDs). These objects are exchanged between the managed node and the SNMP manager. Each MIB defines three types of OIDs:

• Read-Only OIDs: This type defines the information that the network management station can read from the managed node.
• Read-Write OIDs: This type defines the system configuration settings on the managed node that can be modified by the network management station.
• Traps: This type defines the information that the managed node sends to the network management station under specified conditions.

MIBs can be either proprietary (or enterprise) MIBs or standard MIBs. SNMP agent software currently supports both proprietary and standard MIBs. SNMP agent software provides the following MIB modules:

• Proprietary Hardware Information MIB Module
• Proprietary ISDN MIB Module
• Proprietary DS-1 MIB Module
• Standard DS-1 MIB Module
• Proprietary DM3 Extended Platform MIB

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