Configuring Terminal Settings and Sessions
This chapter describes how to manage the terminal settings and sessions on a Cisco NX-OS device.
This chapter includes the following sections:
•
Information About Terminal Settings and Sessions
•
Licensing Requirements for Terminal Settings and Sessions
•
Configuring the Terminal Settings
•
Configuring the Console Port
•
Configuring the COM1 Port
•
Configuring Virtual Terminals
•
Configuring Modem Connections
•
Clearing Terminal Sessions
•
Displaying Terminal and Session Information
•
Default Settings
•
Additional References
Information About Terminal Settings and Sessions
This section includes the following topics:
•
Terminal Session Settings
•
Console Port
•
COM1 Port
•
Virtual Terminals
•
Modem Support
•
Virtualization Support
Terminal Session Settings
The Cisco NX-OS software features allow you to manage the following characteristics of terminals:
•
Terminal type—Name used by Telnet when communicating with remote hosts.
•
Length—Number of lines of command output displayed before pausing
•
Width—Number of characters displayed before wrapping the line
•
Inactive session timeout—Number of minutes that a session remains inactive before the device terminates it.
Console Port
The console port is an asynchronous serial port that allows you to connect to the device for initial configuration through a standard RS-232 port with an RJ-45 connector. Any device connected to this port must be capable of asynchronous transmission. You can configure the following parameters for the console port:
•
Data bits—Specifies the number of bits in an 8-bit byte that is used for data.
•
Inactive session timeout—Specifies the number of minutes a session can be inactive before it is terminated.
•
Parity—Specifies the odd or even parity for error detection.
•
Speed—Specifies the transmission speed for the connection.
•
Stop bits—Specifies the stop bits for an asynchronous line.
Configure your terminal emulator with 9600 baud, 8 data bits, 1 stop bit, and no parity.
COM1 Port
A COM1 port is an RS-232 port with a DB-9 interface that enables you to connect to an external serial communication device such as a modem. You can configure the following parameters for the COM1 port:
•
Data bits—Specifies the number of bits in an 8-bit byte that is used for data.
•
Hardware flowcontrol—Enables the flow-control hardware.
•
Parity—Specifies the odd or even parity for error detection.
•
Speed—Specifies the transmission speed for the connection.
•
Stop bits—Specifies the stop bits for an asynchronous line.
Configure your terminal emulator with 9600 baud, 8 data bits, 1 stop bit, and no parity.
Virtual Terminals
You can use virtual terminal lines to connect to your NX-OS device. Secure Shell (SSH) and Telnet create virtual terminal sessions. You can configure an inactive session timeout and a maximum sessions limit for virtual terminals.
Modem Support
You can connect a modem to the COM1 or console ports on the supervisor module. The following modems were tested on devices running the Cisco NX-OS software:
•
MultiTech MT2834BA (http://www.multitech.com/PRODUCTS/Families/MultiModemII/)
•
Hayes Accura V.92 (http://www.hayesmicro.com/Products/accura-prod-v92.htm)
Note
Do not connect a modem when the device is booting. Follow the procedure specified in the "Initializing a Modem for a Powered-Up Device" section.
The Cisco NX-OS software has the default initialization string (ATE0Q1&D2&C1S0=1\015) to detect connected modems. The default string is defined as follows:
•
AT—Attention
•
E0 (required)—No echo
•
Q1—Result code on
•
&D2—Normal data terminal ready (DTR) option
•
&C1—Enable tracking the state of the data carrier
•
S0=1—Pick up after one ring
•
\015 (required)—Carriage return in octal
Virtualization Support
You can configure the COM1 and consoles ports on in the default VDC. You can configure terminal sessions and virtual terminals on both the default and nondefault VDCs. For more information on VDCs, see the Cisco Nexus 7000 Series NX-OS Virtual Device Context Configuration Guide, Release 4.0.
Licensing Requirements for Terminal Settings and Sessions
The following table shows the licensing requirements for this feature:
|
|
NX-OS |
Terminal setting configuration requires no license. Any feature not included in a license package is bundled with the Cisco NX-OS system images and is provided at no extra charge to you. For a complete explanation of the NX-OS licensing scheme, see the Cisco NX-OS Licensing Guide. |
Configuring the Terminal Settings
You can set the following terminal type and display characteristics for your terminal session:
•
Terminal type
•
Screen length
•
Screen width
•
Inactive session timeout
Note
Any changes that you make to these settings exist only for the duration of the session.
SUMMARY STEPS
1.
terminal terminal-type type
terminal length lines
terminal width columns
terminal session-timeout minutes
2.
show terminal
DETAILED STEPS
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|
|
Step 1 |
terminal terminal-type type
Example: switch# terminal terminal-type vt100 |
Sets the terminal type. The terminal-type string is case sensitive, must be a valid type (for example, vt100 or xterm), and has a maximum of 80 characters. The default type is ansi. |
terminal length lines
Example: switch# terminal length 24 |
Sets the terminal length for displaying command output before pausing. The range is from 0 to 511 lines. Use 0 to not pause while displaying output. The initial default for the console is 0. The initial default for virtual terminal sessions is 31. |
terminal width columns
Example: switch# terminal width 70 |
Sets the terminal width for displaying command output. The range is from 24 to 511 columns. The default is 80 characters. |
terminal session-timeout minutes
Example: switch# terminal session-timeout 60 |
Sets the inactivity timeout for your terminal session. The range is from 0 to 525600 minutes (8760 hours). A value of 0 minutes disables the session timeout. The default is 0. |
Step 2 |
show terminal
Example: switch# show terminal |
(Optional) Displays the terminal settings. |
Configuring the Console Port
You can set the following characteristics for the console port:
•
Data bits
•
Inactive session timeout
•
Parity
•
Speed
•
Stop bits
BEFORE YOU BEGIN
Log in to the console port.
Ensure that you are in the default VDC.
SUMMARY STEPS
1.
configure terminal
2.
line console
3.
databits bits
exec-timeout minutes
parity {even | none | odd}
speed {300 | 1200 | 2400 | 4800 | 9600 | 38400 | 57600 | 115200}
stopbits {1 | 2}
4.
exit
5.
show line console
6.
copy running-config startup-config
DETAILED STEPS
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|
|
Step 1 |
configure terminal
Example: switch# configure terminal switch(config)# |
Enters global configuration mode. |
Step 2 |
line console
Example: switch# line console switch(config-console)# |
Enters console configuration mode. |
Step 3 |
databits bits
Example: switch(config-console)# databits 7 |
Configures the number of data bits per byte. The range is 5 to 8. The default is 8. |
exec-timeout minutes
Example: switch(config-console)# exec-timeout 30 |
Configures the timeout for an inactive session. The range is from 0 to 525600 minutes (8760 hours). A value of 0 minutes disables the session timeout. The default is 0 minutes. |
parity {even | none | odd}
Example: switch(config-console)# parity even |
Configures the parity. The default is none. |
speed {300 | 1200 | 2400 | 4800 | 9600 | 38400 | 57600 | 115200}
Example: switch(config-console)# speed 115200 |
Configures the transmit and receive speed. The default is 115200. |
stopbits {1 | 2}
Example: switch(config-console)# stopbits 2
|
Configures the stop bits. The default is 1. |
Step 4 |
exit
Example: switch(config-console)# exit switch(config)# |
Exits console configuration mode. |
Step 5 |
show line console
Example: switch(config)# show line console |
(Optional) Displays the console settings. |
Step 6 |
copy running-config startup-config
Example: switch(config)# copy running-config startup-config |
(Optional) Copies the running configuration to the startup configuration. |
Configuring the COM1 Port
You can set the following characteristics for the COM1 port:
•
Data bits
•
Flow control on the hardware
•
Parity
•
Speed
•
Stop bits
BEFORE YOU BEGIN
Log in to the console port or COM1 port.
Ensure that you are in the default VDC.
SUMMARY STEPS
1.
configure terminal
2.
line com1
3.
databits bits
flowcontrol hardware
parity {even | none | odd}
speed {300 | 1200 | 2400 | 4800 | 9600 | 38400 | 57600 | 115200}
stopbits {1 | 2}
4.
exit
5.
show line console
6.
copy running-config startup-config
DETAILED STEPS
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|
|
Step 1 |
configure terminal
Example: switch# configure terminal switch(config)# |
Enters global configuration mode. |
Step 2 |
line com1
Example: switch# line com1 switch(config-com1)# |
Enters COM1 configuration mode. |
Step 3 |
databits bits
Example: switch(config-com1)# databits 7 |
Configures the number of data bits per byte. The range is from 5 to 8. The default is 8. |
flowcontrol hardware
Example: switch(config-com1)# flowcontrol hardware |
Enables flow control on the hardware. The default is enabled. Use the no flowcontrol hardware command to disable flow control on the hardware. |
parity {even | none | odd}
Example: switch(config-com1)# parity even |
Configures the parity. The default is none. |
speed {300 | 1200 | 2400 | 4800 | 9600 | 38400 | 57600 | 115200}
Example: switch(config-com1)# speed 115200 |
Configures the transmit and receive speed. The default is 9600. |
stopbits {1 | 2}
Example: switch(config-com1)# stopbits 2 |
Configures the stop bits. The default is 1. |
Step 4 |
exit
Example: switch(config-com1)# exit switch(config)# |
Exits COM1 configuration mode. |
Step 5 |
show line console
Example: switch(config)# show line console |
(Optional) Displays the console settings. |
Step 6 |
copy running-config startup-config
Example: switch(config)# copy running-config startup-config |
(Optional) Copies the running configuration to the startup configuration. |
Configuring Virtual Terminals
This section includes the following topics:
•
Configuring the Inactive Session Timeout
•
Configuring the Session Limit
Configuring the Inactive Session Timeout
You can configure a timeout for inactive virtual terminal sessions on a VDC.
SUMMARY STEPS
1.
configure terminal
2.
line vty
3.
exec-session minutes
4.
exit
5.
show running-config all | begin vty
6.
copy running-config startup-config
DETAILED STEPS
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|
|
Step 1 |
configure terminal
Example: switch# configure terminal switch(config)# |
Enters global configuration mode. |
Step 2 |
line vty
Example: switch# line vty switch(config-line)# |
Enters line configuration mode. |
Step 3 |
exec-session minutes
Example: switch(config-line)# exec-session 30 |
Configures the inactive session timeout for the VDC. The range is from 0 to 525600 minutes (8760 hours). A value of 0 minutes disables the timeout. The default value is 0. |
Step 4 |
exit
Example: switch(config-line)# exit switch(config)# |
Exits line configuration mode. |
Step 5 |
show running-config all | begin vty
Example: switch(config)# show running-config all | begin vty |
(Optional) Displays the virtual terminal configuration. |
Step 6 |
copy running-config startup-config
Example: switch(config)# copy running-config startup-config |
(Optional) Copies the running configuration to the startup configuration. |
Configuring the Session Limit
You can limit the number of virtual terminal sessions on your device.
SUMMARY STEPS
1.
configure terminal
2.
line vty
3.
session-limit sessions
4.
exit
5.
show running-config all | begin vty
6.
copy running-config startup-config
DETAILED STEPS
|
|
|
Step 1 |
configure terminal
Example: switch# configure terminal switch(config)# |
Enters global configuration mode. |
Step 2 |
line vty
Example: switch# line vty switch(config-line)# |
Enters line configuration mode. |
Step 3 |
session-limit sessions
Example: switch(config-line)# session-limit 10 |
Configures the maximum number of virtual sessions for the VDC. The range is from 1 to 64. The default is 32. |
Step 4 |
exit
Example: switch(config-line)# exit switch(config)# |
Exits line configuration mode. |
Step 5 |
show running-config all | begin vty
Example: switch(config)# show running-config all | begin vty |
(Optional) Displays the virtual terminal configuration. |
Step 6 |
copy running-config startup-config
Example: switch(config)# copy running-config startup-config |
(Optional) Copies the running configuration to the startup configuration. |
Configuring Modem Connections
You can connect a modem to either the COM1 port or the console port.
Tip
We recommend that you use the COM1 port to connect the modem.
This section includes the following topics:
•
Enabling a Modem Connection
•
Downloading the Default Initialization String
•
Configuring and Downloading a User-Specified Initialization String
•
Initializing a Modem for a Powered-Up Device
Enabling a Modem Connection
You must enable the modem connection on the port before you can use the modem.
BEFORE YOU BEGIN
Log in to the console port.
SUMMARY STEPS
1.
configure terminal
2.
line com1
line console
3.
modem in
4.
exit
5.
show line
6.
copy running-config startup-config
DETAILED STEPS
|
|
|
Step 1 |
configure terminal
Example: switch# configure terminal switch(config)# |
Enters global configuration mode. |
Step 2 |
line com1
Example: switch# line com1 switch(config-com1)# |
Enters COM1 configuration mode. |
line console
Example: switch# line console switch(config-console)# |
Enters console configuration mode. |
Step 3 |
modem in
Example: switch(config-com1)# modem in |
Enables modem input on the COM1 port. |
modem in
Example: switch(config-console)# modem in |
Enables modem input on the console port. |
Step 4 |
exit
Example: switch(config-com1)# exit switch(config)# |
Exits COM1 configuration mode. |
exit
Example: switch(config-console)# exit switch(config)# |
Exits console configuration mode. |
Step 5 |
show line
Example: switch(config)# show line |
(Optional) Displays the console and COM1 settings. |
Step 6 |
copy running-config startup-config
Example: switch(config)# copy running-config startup-config |
(Optional) Copies the running configuration to the startup configuration. |
Downloading the Default Initialization String
The Cisco NX-OS software provides a default initialization string that you can download for connecting with the modem. The default initialization string is ATE0Q1&D2&C1S0=1\015.
BEFORE YOU BEGIN
Log in to the console port.
SUMMARY STEPS
1.
configure terminal
2.
line com1
line console
3.
modem init-string default
4.
exit
5.
show line
6.
copy running-config startup-config
DETAILED STEPS
|
|
|
Step 1 |
configure terminal
Example: switch# configure terminal switch(config)# |
Enters global configuration mode. |
Step 2 |
line com1
Example: switch# line com1 switch(config-com1)# |
Enters COM1 configuration mode. |
line console
Example: switch# line console switch(config-console)# |
Enters console configuration mode. |
Step 3 |
modem init-string default
Example: switch(config-com1)# modem init-string default |
Writes the default initialization string to the modem. |
modem init-string default
Example: switch(config-console)# modem init-string default |
Writes the default initialization string to the modem. |
Step 4 |
exit
Example: switch(config-com1)# exit switch(config)# |
Exits COM1 configuration mode. |
exit
Example: switch(config-console)# exit switch(config)# |
Exits console configuration mode. |
Step 5 |
show line
Example: switch(config)# show line |
(Optional) Displays the console and COM1 settings. |
Step 6 |
copy running-config startup-config
Example: switch(config)# copy running-config startup-config |
(Optional) Copies the running configuration to the startup configuration. |
Configuring and Downloading a User-Specified Initialization String
You can configure and download your own initialization when the default initialization string is not compatible with your modem.
BEFORE YOU BEGIN
Log in to the console port.
SUMMARY STEPS
1.
configure terminal
2.
line com1
line console
3.
modem set-string user-input string
4.
modem init-string user-input
5.
exit
6.
show line
7.
copy running-config startup-config
DETAILED STEPS
|
|
|
Step 1 |
configure terminal
Example: switch# configure terminal switch(config)# |
Enters global configuration mode. |
Step 2 |
line com1
Example: switch# line com1 switch(config-com1)# |
Enters COM1 configuration mode. |
line console
Example: switch# line console switch(config-console)# |
Enters console configuration mode. |
Step 3 |
modem set-string user-input string
Example: switch(config-com1)# modem set-string user-input ATE0Q1&D2&C1S0=3\015 |
Sets the user-specified initialization string for the COM1 port. The initialization string is alphanumeric and case sensitive, can contain special characters, and has a maximum of 100 characters. Note You must first set the user-input string before initializing the string. |
modem set-string user-input string
Example: switch(config-console)# modem set-string user-input ATE0Q1&D2&C1S0=3\015 |
Sets the user-specified initialization string for the console port. The initialization string is alphanumeric and case sensitive, can contain special characters, and has a maximum of 100 characters. Note You must first set the user-input string before initializing the string. |
Step 4 |
modem init-string user-input
Example: switch(config-com1)# modem init-string user-input |
Writes the user-specified initialization string to the modem connected to the COM1 port. |
modem init-string user-input
Example: switch(config-console)# modem init-string user-input |
Writes the user-specified initialization string to the modem connected to the console port. |
Step 5 |
exit
Example: switch(config-com1)# exit switch(config)# |
Exits COM1 configuration mode. |
exit
Example: switch(config-console)# exit switch(config)# |
Exits console configuration mode. |
Step 6 |
show line
Example: switch(config)# show line |
(Optional) Displays the COM1 and console settings. |
Step 7 |
copy running-config startup-config
Example: switch(config)# copy running-config startup-config |
(Optional) Copies the running configuration to the startup configuration. |
Initializing a Modem for a Powered-Up Device
If you connect a modem to a powered-up physical device, you must initialize the modem before you can use it.
BEFORE YOU BEGIN
After waiting until the device has completed the boot sequence and the system image is running, connect the modem to either the COM1 port or the console port on the device.
Enable the modem connection on the port (see the "Enabling a Modem Connection" section).
SUMMARY STEPS
1.
modem connect line {com1 | console}
DETAILED STEPS
|
|
|
Step 1 |
modem connect line {com1 | console}
Example: switch# modem connect line com1 |
Initializes the modem connected to the device. |
Clearing Terminal Sessions
You can clear terminal sessions on the device.
SUMMARY STEPS
1.
show users
2.
clear line name
DETAILED STEPS
|
|
|
Step 1 |
show users |
(Optional) Displays the user sessions on the device. |
Step 2 |
clear line name
Example: switch# clear line pts/0 |
Clears a terminal session on a specific line. The line name is case sensitive. |
Displaying Terminal and Session Information
To display terminal and session information, perform one of the following tasks:
|
|
show terminal |
Displays terminal settings. |
show line |
Displays the COM1 and console ports settings. |
show users |
Displays virtual terminal sessions. |
show running-config [all] |
Displays the user account configuration in the running configuration. The all keyword displays the default values for the user accounts. |
For detailed information about the fields in the output from these commands, see the Cisco Nexus 7000 Series NX-OS Fundamentals Command Reference, Release 4.0.
Default Settings
Table 4-1 lists the default settings for terminal displays and session parameters.
Table 4-1 Default Terminal Display and Session Parameters
|
|
Terminal type |
ansi |
Terminal length |
0 lines for console sessions 31 lines for virtual terminal sessions |
Terminal width |
80 columns |
Terminal inactive session timeout |
Disabled (0 minutes) |
Console session data bits |
8 |
Console inactive session timeout |
Disabled (0 minutes) |
Console session parity |
none |
Console session speed |
11520 bps |
Console session stop bits |
1 |
COM1 session data bits |
8 |
COM1 hardware flow control |
Enabled |
COM1 session parity |
none |
COM1 session speed |
9600 bps |
COM1 session stop bits |
1 |
Virtual terminal inactive session timeout |
Disabled (0 minutes) |
Virtual terminal sessions limit |
32 |
Modem default initialization string |
ATE0Q1&D2&C1S0=1\015 |
Additional References
For additional information related to implementing Feature-1, see the following sections:
•
Related Documents
Related Documents
|
|
Licensing |
Cisco Nexus 7000 Series NX-OS Licensing Guide, Release 4.0 |
Command reference |
Cisco Nexus 7000 Series NX-OS Fundamentals Command Reference, Release 4.0 |