# Interface

Port > Monitor > Interface

The following information is displayed in the Interface dialog box:

- Utilization %
- Unicasts (ifHCOutUcastPkts + ifHCInUcastPkts)
- Broadcasts (ifHCOutBroadcastPkts + ifHCInBroadcastPkts)
- Multicasts (ifHCOutMulticastPkts + ifHCInMulticastPkts)
- Errors (ifInErrors + ifOutErrors)
- Discards (ifInDiscards + ifOutDiscards + ifInUnknownProtos)

The following list specifies buttons in this dialog box, as well as their function:

- To specify the refresh rate for this dialog box, select a value from the drop-down box.
- Click Start/Stop to begin/end device monitoring.
  Note: The Start/Stop toggle feature is supported by CiscoView 5.3 and later.
- Click Cancel to close the dialog box.
- Click Print to print the contents of the dialog box.
- Click Help to access online help.

Utilization %

Level of utilization on this port; the current value represents utilization levels over the last polling period. The utilization percentage is calculated using the following formula:

- For a half duplex port: 8 * DELTA_OCTETS * 100 / (DELTA_TIME * ifSpeed)
- For a full duplex port: 8 * DELTA_OCTETS * 100 / (DELTA_TIME * 2 * ifSpeed), where DELTA_OCTETS = (ifInOctets1 + ifOutOctets1) - (ifInOctets0 + ifOutOctets0)

Key:

- DELTA_TIME = (sysUpTime1 - sysUpTime0)/100
- ifSpeed indicates the speed of the interface.
- ifInOctets0 is the value of ifInOctets at sysUpTime0, and ifInOctets1 is the value of ifInOctets at sysUpTime1.
- ifOutOctets0 is the value of ifOutOctets at sysUpTime0, and ifOutOctets1 is the value of ifOutOctets at sysUpTime1.

Unicasts (ifHCOutUcastPkts + ifHCInUcastPkts)

Pattern and current number of Unicast packets received and sent.

Broadcasts (ifHCOutBroadcastPkts + ifHCInBroadcastPkts)

Total number of frames successfully transmitted to a subnetwork or link-layer broadcast address.

Total number of broadcast frames successfully received.

Multicasts (ifHCOutMulticastPkts + ifHCInMulticastPkts)

Total number of frames successfully transmitted to a subnetwork or link-layer multicast address.

Total number of multicast frames successfully received.

Errors (ifInErrors + ifOutErrors)

Total number of errors for this port. The value equals the sum of inbound and outbound packets discarded because they contained errors.

Discards (ifInDiscards + ifOutDiscards + ifInUnknownProtos)

Total number of discards for this port. The value equals the sum of inbound and outbound packets discarded because they contained errors, as well as the number of inbound packets discarded because they were directed to an unknown or unsupported protocol.