Port efficiency anomalies identify wired and wireless device interfaces that are not making efficient use of the uplink backhaul connection. This inefficiency might occur in the following scenarios:
An interface might only use half-duplex communication—only 50% of the available throughput capacity.
An interface might occasionally flip between full-duplex and half-duplex modes. If this happens too often, it indicates that the interface cannot maintain a full-duplex connection and is considered an anomaly.
An interface might use an inefficient data rate relative to its capability. Allowable data rates are 10 Mbps, 100 Mbps, 1000 Mbps, 2500 Mbps, 5000 Mbps, and 10000 Mbps. A data rate of 10 Mbps is considered inefficient, while 100 Mbps and higher data rates are considered normal.
An interface might occasionally flip between data rates, for example, from 2500 Mbps to 1000 Mbps. When this happens on a regular basis, it indicates that there is a wider issue preventing the interface from maintaining the higher data rate.
To display the following graphs, select a site with a Port Efficiency anomaly:
Port Supported Speed and Full/Half Duplex Negotiation
Number of Changes (Speed or Duplex)
Note
Both graphs appear for wired and wireless duplex mode anomalies, and speed change anomalies; and for anomalies that are a combination of SUB_OPTIMAL and FLIP anomalies. The Number of Changes graph does not appear if the only anomalies are wired or wireless SUB_OPTIMAL Speed Changes or Duplex Changes.