Brocade Communications Systems IP250 user manual Deleting an expression

33 IP historical performance monitoring

•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.

1008	Brocade Network Advisor IP User Manual
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