threshold interface traffic

[xlogic]

Hello,

I want to configure a threshold on the interface traffic, so when it reaches 70% of the interface speed to send a warning email.
In order to acomplish this, I need the interface speed and the interface usage and apply a cdef in order to calculate the interface usage in percentage.

The cdef will look like this : CURRENT_DATA_SOURCE,8,*,|query_ifHighSpeed|,1024000,*,/,100,*
or
RPN Expression: |ds:traffic_in|,8,*,|query_ifHighSpeed|,1024000,*,/,100,*

The problem is that Current_data_source and ds:traffic_is is not actually the interface usage at that time, is the value retreived by the poller using snmpwalk and you cannot calculate the interface usage based on that value.

Any idea on how can I create a threshold based on the interface usage ?


Thank You