No Traffic info switch port

No Traffic info switch port

Hi,
I have installed OpManager12.2 on a virtual machine in the same subnet in which are two cisco switch that I manage.
Why I can't see any information about Traffic RX and Traffic TX switch ports ?
The switch are: Cisco Catalyst 2950T and Cisco Catalyst 3560
The SNMP configuration on the switch is:
snmp-server community public RO

What's the problem ?



Thanks in advance

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