OpenView Network Node Manager: Designing and Implementing an Enterprise Solution

How to Create MIB Expressions

Standard MIB2 and enterprise MIBs alike support counter variables for bytes, octets, packets, and errors. Among the really useful metrics you need to manage network performance are percent utilization and percent errors. NNM’s historical SNMP data collector predefines quite a few useful MIB expressions. See Chapter 11 of the manual Managing Your Network with HP OpenView Network Node Manager for a detailed list of them. A MIB expression is a reverse polish notation (RPN) arithmetic formula made up of standard MIB object identifiers. The expressions are stored in the $OV_CONF/ mibExpr.conf file, which you maintain manually using your favorite text editor.

Here is an example of a MIB expression:

 If%deferred \ "packets ...