User's Manual

1008 Brocade Network Advisor IP User Manual
53-1003056-01
IP historical performance monitoring
33
• 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 are measured in
seconds).
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.