MIB Structure

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MIB Structure

As mentioned previously, the name space for MIB objects is hierarchical. It is structured in this manner so that each manageable object can be assigned a globally unique name. Certain organizations have the authority to assign the name space for parts of the tree design.

The MIB structure is similar to TCP/IP addresses. You get only one address from the InterNIC and then subnet it according to your needs. You do not have to contact “InterNIC” for each address assignment. The same applies here. Organizations can assign names without consulting an Internet authority for every specific assignment. For example, the name space assigned to Microsoft’s LAN Manager is 1.3.6.1.4.1.77. More recently, Microsoft has been assigned 1.3.6.1.4.1.311; any new MIB would then be identified under that branch. Figure 15.4 illustrates the hierarchical name tree.

The object identifier in the hierarchy is written as a sequence of labels beginning at the root and ending at the object. It flows down the chart, starting with the International Standards Organization (ISO) and ending with the object MIB II. Labels are separated by periods. The following is an example of this labeling technique:

The object identifier for a MIB II:

Object Name	Object Number
Iso.org.dod.internet.
management.mibii	1.3.6.2.1

The object identifier for LAN Manager MIB II:

Object Name	Object Number
iso.org.dod.internet.

private. enterprise.

Lanmanger

1.3.6.1.4.77

The name space used here for the object identifiers is completely separate from that used with Unix domain names.

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