Measuring frame relay serial link utilization

[seun_ewulomi]

Hi,

Does anyone know the correct expression to monitor utilization on framerelay links.

The expression I am currenly using is

(ifInOctets+ifOutOctets)*8*100/ifSpeed

But for e.g when I graph the utilization for a remote site point-topoint(node) with a 2MB link back to the core router I get graphs that are peaking up to about 250% utilization. Is this corrct for frame relay and why would a link utilization peak so high, Doesnt make sense our remote routers are mostly 3810's with some site carrying voice.

regards,

S.G

[svermill]

Serial connections are rated in bps as a duplex circuit. That is, there are x bps inbound and that same x bps outbound. So you need to measure the two traffic types seperately. Something like

ifInOctets * 8 / ifSpeed (bps) * 100 = % (absolute) utilization

and

ifOutOctets * 8 / ifSpeed (bps) * 100 = % (absolute) utilization

[rmushtaq]

http://www.cisco.com/warp/public/477/SNMP/calculate_bandwidth_snmp.html and

http://www.cisco.com/warp/public/477/SNMP/frcircuit.shtml will also help you.