Formula for measuring utilization using SNMP???

[donturrent]

What is the correct formula for measuring the utilization of a frame-relay circuit using SNMP? Currently I am using:

(8 * (frCircuitSentOctets + frCircuitReceivedOctets)
/ExcessBurst) * 100 = %utilized

ExcessBurst is equivalent to the circuit size, ie 128000, 512000, etc.

I have read in some places that I should only take the max of SentOctets or ReceivedOctets but not the sum. Others say take the sum. I know this formula is for half duplex ethernet which frame is not so any guidance (preferably with documentation) is much appreciated.

 

[lgarner]

According to Cisco, your formula is correct for half-duplex media. For full-duplex, take the max(in,out).

http://www.cisco.com/en/US/tech/tk648/tk362/technologies_tech_note09186a008009496e.shtml