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SNMP: Unusual behavior to calculate bandwidth

Hello, 
I have a Cisco Small Business RV320 Gigabit Dual WAN VPN Router in my company. This router is connected to two spanish ISP's and a internal network. It is responsible for balancing the load by the line that provides higher bandwidth in each moment.
I have to monitor the bandwidth by doing SNMP querys to the router. I follow the input and output rules belonging to a full-duplex conection: 


http://www.cisco.com/c/en/us/support/docs/ip/simple-network-management-protocol-snmp/8141-calculate-bandwidth-snmp.html 

 

However the behaviour that appears in the graphs is unusual: the eth0 input bandwidth is the eth1 output bandwidth, and vice versa. It seems that these two interfaces belong to the two ISPs but their behaviour is not usual because each one has a completly different bandwidth contracted.

What could be happening?

Thanks

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