Understanding MIBs

The management information base (MIB) is a database of monitored and managed information on an Extreme device.

The MIB structure can be represented by a tree hierarchy. The root splits into three main branches:

These branches have short text strings and integers (object identifiers) to identify them. Text strings describe object names. Integers allow software to create compact, encoded representations of the names.

MIB structure

Each MIB variable is assigned an object identifier (OID). The OID is the sequence of numeric labels on the nodes along a path from the root to the object. For example, as shown in the following figure, the sysDescr is:

1.3.6.1.2.1.1.1

The corresponding name is:

iso.org.dod.internet.mgmt.mib-2.system.sysDescr

1.3.6.1.2.1.47

The corresponding name is:

iso.org.dod.internet.mgmt.mib-2.entityMIB

The other branches are part of the standard MIBs.

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MIB tree

Access to MIB variables

You can use a MIB browser to access the MIB variables. All MIB browsers load MIBs and perform queries.

Once the MIBs are loaded, read-only access provides access levels between the agent and management station. The access levels are described in the following table.

Table 1. MIB access levels
Access level Description
Not accessible/None You cannot read or write to this variable.
Read-create Specifies a tabular object that can be read, modified, or created as a new row in a table.
Read-only You can only monitor information.
Read-write You can read or modify this variable.
Accessible-to-notify You can read this information only through traps.

Supported MIBs

The following MIBs are distributed with Extreme 9920 software in a concatenated file.