Interface Statistics

Interface statistics/status

In the interface statistics and status can help network professionals to determine whether there are any issues on between a sender and receiver device on the network.

The link state up is an indication the interface of a device is active and can send/receive messages.
On Windows, the netsh interface [ipv4 | ipv6] show interface command allows you to see the status of all the interfaces on the device.
On Linux, the ip link show and ip addr commands allows you to see the status of all interfaces on the device.
On a Cisco router, the show ip interface brief command allows you to see the interfaces status.

Speed defines the total capacity of bandwidth in which in interface can support. Additionally, speed is used to indicate how quickly a device is able to exchange messages with another.
The speed of the interface can be Ethernet / FastEthernet / GigabitEthernet - 10/100/1000.
On Windows, open the Device Manager > right-click on the interface > Properties > Advanced tab.
On Cisco devices, the show interface status and show interfaces commands shows the current state of the speed on the interface.

Duplex is referred to the common method which two (2) devices are preceding to exchange messages.
Duplex of an interface can be Auto (default), Half or Full.
On Windows, open the Device Manager > right-click on the interface > Properties > Advanced tab.
On Cisco devices, the show interface status and show interfaces commands shows the current state of the speed on the interface.

The uptime can help networking professionals to determine whether the device loose power at a certain time.
If a device looses power unexpectedly, should raise considers to the network professionals.
On Cisco devices, the show version command provides the device's update.

Input Errors - Total number of errors. It includes runts, giants, no buffer, CRC, frame, overrun, and ignored counts.
Runts - Packets that are discarded because they are smaller than the minimum packet size for the medium. For instance, any Ethernet packet that is less than 64 bytes is considered a runt.
Giants - Packets that are discarded because they exceed the maximum packet size for the medium. For example, any Ethernet packet that is greater than 1,518 bytes is considered a giant.
CRC - Cyclic Redundancy Check (CRC) errors are generated when the calculated checksum is not the same as the checksum received.
Output Errors - Sum of all errors that prevented the final transmission of datagrams out of the interface that is being examined.
Collisions - Number of messages retransmitted because of an Ethernet collision.
Late Collisions - A collision that occurs after 512 bits of the frame have been transmitted.

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