Sometimes the ifSpeed/ifHighSpeed attribute does not reflect the real value as it is configured for a link, for example when "shaping" is used for an interface.
In this case the physical interface may be a 100 MBit/s link, but only 50MBit/s is configured for the available bandwidth.
Can the thresholds be configured to use the speed limited by shaping?
DX NetOps Spectrum all supported versions
You can set the override speed for interfaces which will be used by the thresholds. This sets the attributes portSpeedIn and portSpeedOut as well.