Monitoring gpon traffic OLT with SNMP

Hello, friend!

To determine link utilization you would have to take two measurements (the increase in received packets). By dividing that by the time difference delta_time you get the average number of packets/sec in the measured time interval. Multiply that by 8 to convert octets into bits. If you divide that result by the ifSpeed (which is in bits/sec) you get a fraction representing the interface utilisation. Finally multiplying it by 100 would give you a percentage.

So if ifInOctet1 and ifInOctet2 are two consecutive measurements time_delta apart in time, the calculation would be: 

Utilization = ((ifInOctet2 - ifInOctet1) * 8 / delta_time) / ifSpeed * 100

ifInOctet2 = 4294967295

ifInOctet1 = 3294967295

delta_time = 300s

ifSpeed = 1 Gb = 1073741824 b

Utilization = 2.48Gbps 

Hope it helps!