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MIB Variable Form

[This is the context-sensitive help for the MIB Variable form.]

The MIB Variable form enables you to view more detailed information about the selected MIB variable provided by a MIB file loaded on the NNMi management server.

For example, the IF-MIB's ifAdminStatus:

ifAdminStatus OBJECT-TYPE
SYNTAX INTEGER {
up(1), -- ready to pass packets
down(2),
testing(3) -- in some test mode
}
ACCESS read-write
STATUS mandatory
DESCRIPTION
"The desired state of the interface. The testing(3) state
indicates that no operational packets can be passed."
::= { ifEntry 7 }

For information about each tab: Concept Link IconSee Also

ClosedTo view the MIB Variable form:

  1. Level-2 Operators and above, do one of the following:

    Method one, from the Inventory workspace:

    • Navigate to the  Inventory workspace, MIB Variables view:
    • Click the row containing the MIB variable of interest.

    Method two, using Actions:

    1. In any map or Node table view, do one of the following:

      • Click a Node and select Actions → MIB Information → List Supported MIBs.
      • Right-click a Node and select MIB Information → List Supported MIBs.
    2. Click the link to the MIB file of interest.
    3. Navigate to the MIB Variables tab.
    4. Select the OID (Numeric) of interest to open an MIB Variable form.

    Method three, for NNMi administrators using the Configuration workspace:

    • To view information about one MIB file, open the  Configuration workspace, MIBs folder, Loaded MIBs view.

      1. Double-click the row of interest.
      2. Navigate to the MIB Variables tab.
      3. Select the OID (Numeric) of interest to open an MIB Variable form.

    • To view information from all MIB files combined, open the  Configuration workspace, MIBs folder, MIB Variables view.

      Select the OID (Numeric) of interest to open an MIB Variable form.

  2. (Optional) To gather this information from a node, see Run SNMP Walk Commands (MIB Browser).
MIB Variable Basic Attributes
Attribute Description
Name

The Name value that is stored in the MIB definition for the selected MIB variable.

For example ifAdminStatus
OID (Numeric)

The numeric representation of the OID (Object Identification) value for the selected MIB variable.

For example: .1.3.6.1.2.1.2.2.1.7
OID (Text)

A symbolic OID uses mnemonic keywords to specify the managed object.

For example: .iso.org.dod.internet.mgmt.mib-2.interfaces.ifTable.ifEntry.ifAdminStatus
Syntax

The SYTNAX value for the MIB variable.

For example, the IF-MIB's ifAdminStatus variable's SYNTAX:

ifAdminStatus OBJECT-TYPE
   SYNTAX  INTEGER {
       up(1),      -- ready to pass packets
       down(2),
       testing(3)  -- in some test mode
}
ClosedFor more information, click here.

  • When evaluating MIB expressions that include MIB variables of type Counter, Counter64, or Time_Ticks, NNMi evaluates the MIB Variable using the difference in value between the most recent poll and the poll before it. If you want NNMi to calculate a rate over time in seconds, divide the MIB Expression by sysUptime. For example:

    (((ifInOctets+ifOutOctets)*8/ifSpeed)*100)/sysUpTime*0.01

    The sysUpTime variable is a value of hundredths of a second. When you want the rate in seconds, use sysUpTime*0.01 in the MIB expression as shown in the previous example.

  • If you use a MIB variable of type Counter, Counter64, or Time_Ticks in the MIB Expression, NNMi automatically collects sysUpTime values if sysUpTime is not already in the MIB Expression. NNMi uses the sysUptime value to detect a system reboot. Any time a system reboot is detected, NNMi cannot determine the difference in values between polls for any Counter MIB variable and therefore does not calculate the MIB Expression for that poll.
Textual Convention Defines the format rules to be used when displaying the MIB value. See Textual Convention Form for more information.
MIB

The name value that is stored at the beginning of the MIB definitions to identify the MIB.

For example, RFC1213-MIB is the name of the MIB:

RFC1213-MIB DEFINITIONS ::= BEGIN

Tip To explore all of the information available from this MIB, click the Lookup icon, and select Open.
Description

The Description that is stored in the MIB for the selected MIB variable.

For example, the ifDescr variable's (1.3.6.1.2.1.2.2.1.2) definition in RFC2233 IF-MIB:

DESCRIPTION
"A textual string containing information about the interface. This string should include the name of the manufacturer, the product name and the version of the interface hardware/software."

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