How to calculate Avg TX & RX utilization (%) for a 6500 switch interface

[jennyjohn]

I have 6500 switch at a remote office. I don't have an LMS and I am unable to run Netflow because the link is very slow. I have to find out the average tx utilization and average rx utilization (in percentage) for all interfaces of the switch. How can I calculate that?

The following cisco link gives the calculation for Input & Output utilization
http://www.cisco.com/en/US/tech/tk648/tk362/technologies_tech_note09186a008009496e.shtml

#show interfaces gigabitEthernet 1/1 counters will give me the InOctets & OutOctets and with a delta time of 30seconds, but I am getting a wrong value.

Thanks in advance

[Joe Clarke · Accepted solution]

The formula in this tech tip is correct.  Can you provide the raw numbers for input and output octets from a few polling intervals for one sample interface in addition to the ifSpeed of that interface?

[jennyjohn]

Thanks Joe, the formula is correct. My speed value was initially wrong and so I got the wrong result. The value obtained is the tx & rx utilization and not the average.