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InterfacesPrivileged EXEC

show interfaces status

Displays a summary of all switch interfaces including their status, VLAN, duplex, speed, and type, used to quickly verify interface connectivity and configuration.

Syntax·Privileged EXEC
show interfaces status

When to Use This Command

  • Check if a newly connected device is being detected by the switch (status shows 'connected' or 'notconnect').
  • Verify that interfaces are in the correct VLAN after VLAN configuration changes.
  • Troubleshoot a user reporting no network connectivity by checking interface status and errors.
  • Audit interface configurations for speed/duplex mismatches that cause performance issues.

Command Examples

Basic show interfaces status

show interfaces status
Port      Name               Status       Vlan    Duplex  Speed  Type
Gi0/0/0   Link to Core        connected    1       a-full  a-1000  10/100/1000BaseTX
Gi0/0/1   User PC             notconnect   10      auto    auto   10/100/1000BaseTX
Gi0/0/2   Server              disabled     20      auto    auto   10/100/1000BaseTX
Gi0/0/3                       connected    1       a-half  a-10   10/100/1000BaseTX
Gi0/0/4   VoIP Phone          connected    10      a-full  a-100  10/100/1000BaseTX

Port: Interface identifier. Name: Description configured with 'description' command. Status: 'connected' (link up), 'notconnect' (cable unplugged or device off), 'disabled' (administratively down). Vlan: Access VLAN number (or trunk). Duplex: 'a-full' (auto-negotiated full), 'a-half' (auto half), 'full' (manually set), 'half'. Speed: 'a-1000' (auto 1Gbps), 'a-100' (auto 100Mbps), 'a-10' (auto 10Mbps), or fixed values. Type: Physical interface media type.

Show interfaces status with errors

show interfaces status
Port      Name               Status       Vlan    Duplex  Speed  Type
Gi0/0/0   Link to Core        connected    1       a-full  a-1000  10/100/1000BaseTX
Gi0/0/1   User PC             err-disabled 10      auto    auto   10/100/1000BaseTX
Gi0/0/2   Server              connected    20      a-full  a-1000  10/100/1000BaseTX
Gi0/0/3                       notconnect   1       auto    auto   10/100/1000BaseTX

In this output, Gi0/0/1 shows 'err-disabled' status, indicating the interface was automatically shut down due to an error (e.g., port security violation, BPDU guard, or duplex mismatch). The other interfaces show normal states. 'err-disabled' requires manual intervention (shutdown/no shutdown) after resolving the cause.

Understanding the Output

The 'show interfaces status' command provides a quick overview of all switch ports. The 'Status' column is the most critical: 'connected' means the interface has a working link; 'notconnect' means no cable or device is detected; 'disabled' means the interface is administratively down (shutdown); 'err-disabled' indicates a port that was automatically disabled due to an error condition. The 'Vlan' column shows the access VLAN assigned to the port (or 'trunk' for trunk ports). 'Duplex' and 'Speed' show negotiated or configured values; 'a-' prefix indicates auto-negotiated values. Mismatches (e.g., one side full, other half) cause poor performance or errors. 'Type' shows the physical media. In a real network, look for ports that are 'notconnect' when they should be connected, or 'err-disabled' which requires troubleshooting. Also watch for speed/duplex mismatches (e.g., one side auto, other fixed) that degrade performance.

CCNA Exam Tips

1.

CCNA exam often tests the difference between 'connected', 'notconnect', 'disabled', and 'err-disabled' statuses.

2.

Remember that 'err-disabled' is caused by security violations (port security, BPDU guard) or errors (duplex mismatch) and requires manual recovery.

3.

The 'Vlan' column shows the access VLAN; if a port is in trunk mode, it will show 'trunk' instead of a VLAN number.

4.

Be able to identify a speed/duplex mismatch: one side shows 'a-full' and the other shows 'half' or 'a-half'.

Common Mistakes

Confusing 'notconnect' with 'disabled': 'notconnect' means no cable or device, while 'disabled' means the interface is administratively shut down.

Assuming 'a-full' and 'full' are the same: 'a-full' is auto-negotiated full duplex, 'full' is manually configured; mismatches can occur.

Forgetting that 'err-disabled' ports require a 'shutdown' followed by 'no shutdown' to recover after fixing the cause.

Related Commands

show interfaces

Displays detailed status and statistics for all interfaces or a specific interface, used to verify interface operational state, errors, and performance.

show interfaces description

Displays a summary of all interfaces with their status, protocol, and description, useful for quickly verifying interface connectivity and administrative notes.

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