show line
To display the status of a line, use the command show line. This is not a privileged command and can be executed by any user. On an eight-port terminal server, show line gives output like this:
Router>show line TTY TYP Tx/Rx A Modem Roty AccO AccI Uses Noise Overruns 0 CTY - - - - - 0 0 0/0 1 TTY 9600/9600 - - - - - 3 542 0/0 * 2 TTY 9600/9600 - - - - - 1 0 0/0 3 TTY 38400/38400 - RIisCD - - - 1 0 0/0 I 4 TTY 38400/38400 - inout - - - 25 0 0/0 I 5 TTY 38400/38400 - inout - - - 3940 0 0/0 I 6 TTY 38400/38400 - inout - - - 1483 0 0/0 I 7 TTY 38400/38400 - inout - - - 364 0 0/0 I 8 TTY 38400/38400 - inout - - - 12 0 0/0
Table 4-2 describes the fields in this report.
|
Column |
Meaning |
|---|---|
|
1st column |
I = line is idle; * = line is active. |
|
TTY |
Actual line number. |
|
TYP |
Type of line: CTY (console), AUX, TTY, VTY, LPT. |
|
TX/RX |
Transmit and receive baud rates for this line. |
|
A |
Autobaud (automatic baud rate detection) is active. |
|
Modem |
Type of modem signal configured for this line (callin, callout, cts-req, dtr-act, inout, RIisCd). |
|
Roty |
Rotary group configured for this line. |
|
AccO, AccI |
Access lists for this line, both output and input (see access-class in Chapter 17). |
|
Uses |
Number of connections made to this line since the router was booted. |
|
Noise |
Number of times noise was detected on this line. Can be used to gauge line quality. |
|
Overruns |
Number of buffer overruns that have occurred on this line, in the format hardware/software. Hardware overruns occur when the hardware receives data from the software faster than it can process it. Software overruns occur when the software receives data from the hardware faster than it can process it. A bad cable could cause overruns. |
You can retrieve more detailed information by selecting a single line:
Router>show line 5 Tty Typ Tx/Rx A Modem Roty AccO AccI Uses Noise Overruns A 5 TTY 38400/38400 - inout - - - 3969 0 0/0 Line 5, Location: "", Type: "" Length: 24 lines, Width: 80 columns Baud rate (TX/RX) is 38400/38400, no parity, 1 stopbits, 8 databits Status: Ready, Active, No Exit Banner, Async Interface Active Capabilities: Hardware Flowcontrol In, Hardware Flowcontrol Out Modem Callout, Modem RI is CD, Line usable as async interface Modem state: Ready Special Chars: Escape Hold Stop Start Disconnect Activation ^^x none - - none Timeouts: Idle EXEC Idle Session Modem Answer Session Dispatch 0:00:30 never none not set Session limit is not set. Time since activation: 2:08:08 Editing is enabled. History is enabled, history size is 10. Full user help is disabled Allowed transports are lat telnet rlogin mop. Preferred is lat. No output characters are padded No special data dispatching characters Modem hardware state: CTS DSR DTR RTS Line is running PPP for address 192.101.187.165. 0 output packets queued, 1 input packets. Async Escape map is 00000000000000000101000000000000 Group codes: 0 Interface Async5: (passive, compression on) Rcvd: 5711 total, 4516 compressed, 0 errors 0 dropped, 0 buffer copies, 0 buffer failures Sent: 5085 total, 4032 compressed, 138729 bytes saved, 3943290 bytes sent 1.3 efficiency improvement factor Connect: 16 rx slots, 16 tx slots, 1275 long searches, 765 misses 84% hit ratio, five minute miss rate 0 misses/sec, 1 max
The first part of this report has the same format given in Table 4-2. However, the rest of the report goes into great detail about the line's characteristics. Table 4-3 shows what these additional fields mean.
|
Field |
Meaning |
|---|---|
|
Line |
TTY line number. |
|
Location |
Value of the location keyword set for this line. See location in Chapter 17. |
|
Type |
Value specified by the line configuration. |
|
Length |
Terminal display length in characters. |
|
Width |
Terminal display width in characters. |
|
Baud |
Transmit (TX) and receive (RX) baud rates. |
|
Status |
State of the line (ready, connected/disconnected, active/inactive, exit banner). |
|
Capabilities |
How or for what this line can be used. |
|
Modem state |
Control state of the modem. If not Ready, suspect a modem problem. |
|
Special chars |
Settings of characters defined for this line. |
|
Timeouts |
Timeouts as specified by the configurations. |
|
Session limit |
Maximum number of sessions for this line. Controlled by the session-limit command. |
|
Time since activation |
Time elapsed since line activation (i.e., how long the line has been considered active). |
|
Editing |
Whether command-line editing is enabled. |
|
History |
Length of the command history buffer. Set by the user with the history command. |
|
Full user help |
Whether the full-help command has been activated for this line. |
|
Transport methods |
Transport mechanisms allowed on this line. See the transport command in Chapter 17 for more information. |
|
Character padding |
See the padding command in Chapter 17. |
|
Data dispatching characters |
Whether any data-dispatching characters are configured. See dispatch-character in Chapter 17 for more information. |
|
Line protocol |
The protocol and address specified for this line. |
|
Output/input packets |
Queued packet counts for this line. |
|
Group codes |
AT group codes for this line. |