Use the SNMP - High Traffic probe to alert you about high link utilization. This probe monitors the ifInOctets and ifOutOctets traffic statistics of a particular interface on the device, and sets the device into alarm or warning when the traffic exceeds certain thresholds. It also gives a DOWN alarm if the interface's ifOperStatus is not equal to 1 (up).
Find this probe in the Network Devices category in the Set Probe window.
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