formula of Traffic in Opmanager

formula of Traffic in Opmanager

Hello everyone, could you please tell me how can I get traffic via SNMP commands ? What is the formula ? I found something on the Internet. It was like "inOctets * 8 * 100 / ifspeed or outOctets * 8 * 100 / ifspeed". But when i tried count it, always i got different result. So I want to ask you what is the right formula thx you

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