The interface_traffic probe will query the configured hosts for SNMP data on every predefined interval. Network traffic data will be collected according to a user-setup. The probe may be configured to monitor the network interface (on a PC, UNIX system, router, switch etc.) and report whenever the traffic breaches a predefined threshold.
How to interface traffic probe calculates the utilization of interface.
UIM 8.51 & Later
Interface traffic 5.45
The below command and example for calculation of interface_traffic probe:-
tdiff = (double)curr.sysUptime/100 - (double)cif->previous.sysUptime/100;
Current OutOctet = 715026517864
Previous OutOctet = 712975047817
Difference = 2051470047 (delta value)
Actual delta = 2051470047/tdiff (2051470047/516) = 3975717
maxspeed=1250000
When you create a % of delta (i.e. pctOctet) = (Actual delta *100/ maxspeed)
Calculation is= 3975717*100/1250000=>318.05
As you can see, value is coming more than 100 but we restrict this value to 100% which you can see in your alarm message.
You can verify this calculation through snmpwalk for device IP where interface id is 553 (GigabitEthernet3/1/41)
OIDifDescr= 1.3.6.1.2.1.2.2.1.2. (find GigabitEthernet3/1/41 index, as per log it should be 553)
OIDifHCInOctets= 1.3.6.1.2.1.31.1.1.1.6.553
OIDifHCOutOctets= 1.3.6.1.2.1.31.1.1.1.10.553
OIDifHighSpeed= 1.3.6.1.2.1.31.1.1.1.15.553
OIDifInOctets= 1.3.6.1.2.1.2.2.1.10.553
OIDifOutOctets= 1.3.6.1.2.1.2.2.1.16.553
OIDifSpeed= 1.3.6.1.2.1.2.2.1.5.553