Show & diagnostics
show ip interface brief
One-line per interface: IP, admin status, line protocol. The single most useful verification command.
Works on: Router, SwitchMode: enable
Example
R1# sh ip int brWatch out
Status column = admin state. Protocol column = real line protocol (needs cable + peer up).
Run this command live
Don't just read it — type show ip interface brief in a real network simulator in your browser and watch it take effect. No install, no account needed to start.
Frequently asked
What does the "show ip interface brief" command do?
One-line per interface: IP, admin status, line protocol. The single most useful verification command.
What's the common gotcha with "show ip interface brief"?
Status column = admin state. Protocol column = real line protocol (needs cable + peer up).
Example of "show ip interface brief"
R1# sh ip int br