The Cisco IOS command "show line" gives you a snapshot of which terminal "lines" are in use...
R1# sh line
Tty Line Typ Tx/Rx A Modem Roty Uses Noise Overruns Int
0 0 CTY - - - - - 0 0 0/0 -
* 1 1 AUX 115200/115200- inout - 3 0 53/0 -
* 514 514 VTY - - - - - 80 0 0/0 -
515 515 VTY - - - - - 2 0 0/0 -
516 516 VTY - - - - - 0 0 0/0 -
517 517 VTY - - - - - 0 0 0/0 -
518 518 VTY - - - - - 0 0 0/0 -
519 519 VTY - - - - - 0 0 0/0 -
520 520 VTY - - - - - 0 0 0/0 -
521 521 VTY - - - - - 0 0 0/0 -
522 522 VTY - - - - - 0 0 0/0 -
523 523 VTY - - - - - 0 0 0/0 -
524 524 VTY - - - - - 0 0 0/0 -
525 525 VTY - - - - - 0 0 0/0 -
526 526 VTY - - - - - 0 0 0/0 -
527 527 VTY - - - - - 0 0 0/0 -
528 528 VTY - - - - - 0 0 0/0 -
529 529 VTY - - - - - 0 0 0/0 -
Line(s) not in async mode -or- with no hardware support:
2-513
The terminal types are CTY=console, AUX=auxilliary, and VTY=virtual terminal.
The console and auxilliary ports are serial connections and the vty lines are for remote connections over the network using telnet or ssh.
The console port is typically used when setting up the device for the first time or in disaster recovery type scenarios when an IOS image upgrade isn't cooperating, or the device doesn't have a valid IOS image, for example.
The auxiliary port is typically used by a modem for "out-of-band" access as a backup connection for when the network is having issues. It's almost as good as the console port, but, doesn't give you rommon access.
You can manually disconnect any of these lines with the following command...
R1# clear line <x>
[confirm] <------------press enter here
[OK]
Additionally, sometimes you'll want to know what IP addresses are connected. Use the "sh users" command for this...
R1# sh users
Line User Host(s) Idle Location
514 vty 0 idle 2d00h 10.10.0.2
515 vty 1 idle 00:01:01 10.10.11.23
*516 vty 2 idle 00:00:00 10.10.11.12
Interface User Mode Idle Peer Address
Se0/2/0:0 Sync PPP 00:00:00
Se0/2/1:0 Sync PPP 00:00:00
Se0/2/2:0 Sync PPP 00:00:00
Mu1 Sync PPP 00:00:00 192.168.101.20
Here the asterisk by line 516 shows my IP address. Also, try the command "who" on some IOS versions. It does pretty much the same thing.
Back to Top Ten Cisco IOS Commands
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