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Networking Fundamentals · Foundational

Show Interfaces Command

The Cisco IOS command that displays an interface's status, speed, duplex, counters and errors.

Definition

The first line shows Layer 1 and Layer 2 status (for example "up, line protocol is up"); counters show input errors, CRC, runts, giants, collisions and drops. show ip interface brief summarizes IP addresses and status for all interfaces.

Example

show interfaces g0/1 reveals "Full-duplex, 1000Mb/s" and 0 CRC errors.

Exam tip

"administratively down" = shutdown; "up/down" = Layer 2 problem; "down/down" = Layer 1 problem.

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