Brocade Network Advisor IP User Manual v12.1.0 - Manual (Page 1099)

Brocade Network Advisor IP User Manual 1045
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IP historical performance monitoring
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6. Select a MIB object from the Available MIB Objects tree structure.
A description of the MIB object displays in the MIB Details field.
7. Build your expression in the Expressions field using the operators above the field.
• MIB Object.Abs — The raw value of the MIB variable that is polled from the product will be
used in the SNMP expression calculation.
• MIB Object.Delta — Assuming the MIB value polled in the current polling period is M(T1)
and the value polled in the Previous polling period is M(T0), the MIB value to be used in
the expression is calculated using M(T1)- M(T0).
• MIB Object.Rate — Assuming the MIB value polled in the current polling period is M(T1)
and the value polled in the Previous polling period is M(T0), the MIB value to be used in
the expression is calculated using (M(T1)- M(T0))/ (T1 – T0) (T0 and T1 in the unit of
second).
The following example is the formula used to create the If%Errors expression, which calculates
the error percentage for input packets on an interface.
(iFInErrors / (ifHCInUcastPkts + ifInMulitcastPkts + ifInBroadcastPkts)) * 100
8. Click OK to accept your changes.
Deleting an expression
Complete the following steps to delete an expression.
1. Select Monitor > Performance > Expressions
The Expressions dialog box displays.
2. Select the expression you want to delete from the Expressions list.
3. Click Delete.
A confirmation dialog box displays.
4. Click OK to delete the expression.