Interface utilization refers to the transmission and reception of data and associated framing of device interfaces. Interface utilization is commonly referred to as "network utilization," "circuit utilization," or "uplink utilization."
The interface utilization percentage metric is calculated from average data because an instantaneous reading of individual interface utilization is either 100% (actively transmitting or receiving a frame) or 0% (not actively transmitting/receiving a frame). The average utilization percentage value includes the amount of time that the interface was in use over the given interval.
The interface utilization rate metric takes into account the interface speed, or its available bandwidth. For a physical interface, the available bandwidth of an interface is defined as the actual clockspeed rate at which the interface is capable of transmitting data. For example, 1536 Kbps, 44.728 Mbps, 100 Mbps, 1 Gbps, and 10 Gbps describe clockspeed rates. For logical interfaces, such as subinterfaces, the available bandwidth is defined as the bandwidth value assigned to the interface by a network administrator. However, the total amount of real bandwidth available to the logical interfaces cannot exceed the physical interface capacity in terms of actual transmission rates.
Full-duplex interfaces have the capability to transmit data independently at the same time that they can receive data. This capability requires independent hardware dedicated in the transmit direction and the receive direction of the interface. Accordingly, the average utilization of an interface is reported separately in either the inbound or outbound direction. For example, separate views show "Average Utilization Out" and "Average Utilization In".
The network utilization can be derived from interface utilization values averaged over time from interfaces that are in use or not in use.
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