Using Cisco IOS Software

This appendix describes the basics about using the Cisco IOS software that is installed on every Cisco uBR910 series cable data service unit (DSU). This appendix describes the following topics:

Caution Before attempting to reconfigure the Cisco uBR910 series cable data service unit (DSU) at a subscriber site, contact your provisioning or billing system administrator to ensure remote configuration is allowed. To ensure proper levels of service for all customers, service providers typically disable remote configuration of the cable modems on their system and allow only the configuration that is specified by the cable provisioning or billing system.

If remote configuration is disabled, any changes you make do not remain in effect after the Cisco uBR910 series is powered off and on. Instead, the Cisco uBR910 series DSU returns to its previous configuration. In some cases, these settings will cause the cable interface to disconnect and might be lost when the cable interface is reset.

Accessing the Command-Line Interface

The Cisco uBR910 series DSU's command-line interface (CLI) can be accessed either through a Telnet connection over a TCP/IP network or by a direct connection to the console port. See the following sections for more information.

Note Unlike other Cisco IOS-based routers, you cannot access the CLI through the Cisco uBR910 series DSU's HTTP web-based server because this feature is automatically disabled when the Cable Monitor is active.

Connecting Using Telnet

If the Cisco uBR910 series DSU has successfully booted up and is operational and online, its CLI interface can be accessed by establishing a Telnet connection. Telnet can be used from any computer or terminal that has TCP/IP connectivity with the Cisco uBR910 series DSU---the TCP/IP connectivity can exist either through the serial interface or the cable interface.

Note As a security measure, you can enter EXEC mode during a Telnet session only if an enable password has been set. If an enable password has not been set, you cannot change the configuration when you log in using Telnet; to change the configuration you must log in through the console port.

Caution Care must be taken if you use a laptop computer to make a Telnet connection through the Cisco uBR910 series DSU's serial interface. If the laptop computer will not be regularly used at the subscriber site, you should power cycle the Cisco uBR910 series DSU after you use the CLI and save your configuration changes.

Power cycling the Cisco uBR910 series ensures the laptop computer does not remain in the Cisco uBR910 series list of allowable customer premises equipment (CPE) devices at the subscriber site. Reinitialization of the cable interface clears out the bridge table and resets the counter that specifies the number of CPE devices being bridged. This is particularly important when the Cisco uBR910 series DSU is configured to operate in a DOCSIS-compliant bridging mode.

If the headend is a Cisco uBR7200 series universal broadband router, the system administrator at the headend might have to enter the clear cable modem host mac address command to remove the laptop computer from its list of CPE devices.

Note This behavior is required by the DOCSIS 1.0 specification.

Connecting to the Console Port

The CLI is available by connecting directly to the console port on the back panel of the chassis. The console port is an EIA/TIA-232 serial interface configured as data communications equipment (DCE) and uses an RJ-45 connector. The port is wired the same as Cisco's other routers and uses the same console kit and cable.

The console port can be accessed by any computer or terminal with an RS-232 serial port set for 9600 baud, 8 data bits, no parity, 1 stop bit (9600 8N1). Unless the default configuration has been changed, your terminal software should be set to emulate an ANSI, VT100, or compatible terminal.

Note Typically, the console port is disabled when the Cisco uBR910 series DSU downloads a Cisco IOS configuration file during the provisioning process. If this is the case, the CLI can be accessed only through a Telnet connection.

Understanding the Command-Line Interface

The Cisco IOS command-line interface (CLI) is a text-based interface available on every Cisco router that uses the Cisco IOS software. This allows a network administrator to quickly configure any of Cisco's many different models of routers without having to learn a unique interface for each.

The following guidelines apply to the CLI:

The CLI is case-insensitive---you can enter either SHOW VERSION or show version to display the Cisco uBR910 series DSU's software revision.
You can abbreviate commands and keywords to the minimum number of characters that define a unique abbreviation. For example, you can abbreviate the show command to sh (but you cannot abbreviate the show command to just s because several other commands also start with the letter s).
If you enter an unrecognized command, the Cisco uBR910 series assumes the command is actually the host name of a PC or other router and tries to open a Telnet connection to it. If that host does not exist, or if the Cisco uBR910 series has not been configured with a name-resolution server, the connection will every time out and the CLI prompt will be redisplayed.
By default, if a command displays more than one screen of data, it pauses the screen and displays --More-- at the bottom of the screen. You can advance one line at a time by pressing the Return key, advance one screen at a time by pressing the spacebar, or quit by pressing q.
As a general rule, every configuration command can be disabled by prefixing the command with the keyword no. For example, IP routing is enabled with the ip routing command; IP routing is disabled with the no ip routing command.
The CLI on the Cisco uBR910 series DSU can be accessed either through a Telnet connection or through a serial connection with its console port. (Web browser access to the CLI is not supported on the Cisco uBR910 series DSU.)

These additional topics are covered in the sections that follow:

The CLI contains many different command modes that allow access to different areas of the Cisco uBR910 series DSU's configuration. Certain commands are available only in a specific command mode. See "Command Modes" section.
The question mark character (?) displays a list of the available commands and can be used to display help about a specific command. See "Context-Sensitive Help" section.
You can use the command history feature to quickly recall and edit previous commands. See "Command History Features" section.
When commands produce long displays, you can use output modifiers to select which parts of the display you want to see. See "Using Output Modifiers" section.

Command Modes

The Cisco IOS software has many different modes of operation---each mode contains its own set of commands that either display or configure a particular aspect of the Cisco uBR910 series DSU's configuration. When you initially log in to the Cisco uBR910 series DSU, you enter user EXEC mode, which provides a limited number of commands that can only display information about the Cisco uBR910 series; you cannot change the system's configuration in user EXEC mode.

To change the unit's configuration, you must enter privileged EXEC mode or one of the other configuration modes. Each command mode has a unique prompt so that you can easily see which mode you are in.

Table A-1 shows the most common modes that are used on the Cisco uBR910 series DSU:

Table A-1: Cisco uBR910 series Command Modes

Command Mode Function Access Method Prompt¹

User EXEC

Contains a limited number of commands that only display information about the Cisco uBR910 series DSU.

Log in.

Router>

Privileged EXEC

Contains a larger number of display commands, as well as other commands that can change the configuration of the Cisco uBR910 series DSU. Also provides access to the global configuration mode.

From user EXEC mode, enter the enable command.

Router#

Global configuration

Contains commands that can change the operation of the Cisco uBR910 series DSU at a system level and provides access to the interface configuration mode.

From privileged EXEC mode, enter the configure terminal command.

Router(config)#

Interface configuration

Contains commands that change the operation of the serial and cable interfaces.

From global configuration mode, enter the interface interface-num command.

Router(config-if)#

¹The prompt always displays the system's host name. The default host name is "Router" but this can be changed with the global configuration hostname command.

Command Mode	Function	Access Method	Prompt¹
User EXEC	Contains a limited number of commands that only display information about the Cisco uBR910 series DSU.	Log in.	Router>
Privileged EXEC	Contains a larger number of display commands, as well as other commands that can change the configuration of the Cisco uBR910 series DSU. Also provides access to the global configuration mode.	From user EXEC mode, enter the enable command.	Router#
Global configuration	Contains commands that can change the operation of the Cisco uBR910 series DSU at a system level and provides access to the interface configuration mode.	From privileged EXEC mode, enter the configure terminal command.	Router(config)#
Interface configuration	Contains commands that change the operation of the serial and cable interfaces.	From global configuration mode, enter the interface interface-num command.	Router(config-if)#

Table A-1 lists the command modes in the order they must be accessed. You must log in to a higher-level mode before accessing the next lower mode. For example, before you can enter global configuration mode, you must first log in to user EXEC mode and then privileged EXEC mode. Then you can enter global configuration mode, and if desired, log in to interface configuration mode.

To leave a command mode and return to the previous mode, enter either the exit or end command. See the following sections for more details on each command mode.

Note For complete information on using the CLI, see the Configuration Fundamentals Configuration Guide , available on CCO and the Documentation CD-ROM.

User EXEC Mode

When you log in to the Cisco uBR910 series DSU, you automatically enter the user EXEC command mode, which contains commands that only display some parts of the Cisco uBR910 series DSU's configuration. In general, user EXEC commands allow you to connect to remote devices, change terminal settings on a temporary basis, perform basic tests, and list system information.

The user-level prompt consists of the Cisco uBR910 series DSU's name followed by a right angle bracket (>):

Router>

To leave user EXEC mode and log out of the Cisco uBR910 series DSU, enter the logout or exit command.

Privileged EXEC Mode

Before you can enter any commands that change the Cisco uBR910 series DSU's configuration, you must enter privileged EXEC mode. In this mode, you can change certain parameters, use more detailed show commands, and other configuration modes to change the operation of the unit and its interfaces.

To access the privileged EXEC mode, enter the enable command from user EXEC mode. You are then prompted for a password, if one has been set for the privileged EXEC mode. The password is not displayed on the screen and is case sensitive. The prompt changes to the host name followed by the pound sign (#) to indicate you are now in privileged EXEC mode.

Note If an enable password has not been set, privileged EXEC mode can be accessed only from the console, not through a Telnet connection.

The following example shows how to access privileged EXEC mode:

Router> enable
Password: <password> 
Router#

To return from privileged EXEC mode to user EXEC mode, use the disable or exit command.

Global Configuration Mode

The global configuration mode contains commands that change configuration parameters that affect the operation of the entire Cisco uBR910 series DSU, such as routing and bridging functions, as opposed to changing the operation of a single interface. To log in to global configuration mode, enter the configure terminal from privileged EXEC mode. The prompt changes to the host name followed by "(config)#" to indicate you are now in global configuration mode.

The following example shows how to access global configuration mode:

Router# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#

To exit global configuration mode and return to privileged EXEC mode, enter the exit or end command, or type Ctrl-Z.

Interface Configuration Mode

The interface configuration mode configures features for an individual interface. The Cisco uBR910 series DSU supports the following interfaces:

Serial0---Serial interface that connects to the access router, providing the WAN connection for the customer's local area network
cable-modem0---Cable interface that connects to the cable network
Loopback0---A virtual internal interface

Note In addition to these physical interfaces, certain features, such as VDPN, create virtual interfaces.

To log in to interface configuration mode, enter the interface command followed by the name of the interface to be configured. The prompt changes to the host name followed by "(config-if)#" to indicate you are now in interface configuration mode.

For example, to configure the cable interface on the Cisco uBR910 series DSU, enter the following commands from global configuration mode:

Router(config)# interface cable-modem 0 
Router(config-if)#

To exit interface configuration command mode and return to global configuration mode, enter the exit command, or type Ctrl-Z.

Context-Sensitive Help

The Cisco IOS CLI contains a context-sensitive help feature that can display a list of the commands that are available for the current command mode. The context-sensitive help can also display the syntax for a particular command, as well as complete a partially entered command.

Table A-2 shows the different ways you can access the context-sensitive help.

Table A-2: Context-Sensitive Help for the Command Line Interface

Command Purpose

help

Obtain a brief description of the help system in any command mode.

?

List all commands available for a particular command mode.

partial-command?

Obtain a list of commands that begin with a particular character string. (Do not enter a space before the question mark.)

partial-command <tab>

Complete a partial command name. (Do not enter a space before entering the tab character.)

command ?

List a command's associated keywords. (A space must precede the question mark.)

command keyword ?

List a keyword's associated arguments. (A space must precede the question mark.)

Command	Purpose
help	Obtain a brief description of the help system in any command mode.
?	List all commands available for a particular command mode.
partial-command?	Obtain a list of commands that begin with a particular character string. (Do not enter a space before the question mark.)
partial-command <tab>	Complete a partial command name. (Do not enter a space before entering the tab character.)
command ?	List a command's associated keywords. (A space must precede the question mark.)
command keyword ?	List a keyword's associated arguments. (A space must precede the question mark.)

The context-sensitive help displays only the commands and options that are appropriate for the current command mode. For example, to display the available show commands in the user EXEC mode, enter show ? as shown in the following example:

 uBR910 series> show ? 
  backup            Backup status
  bootflash:        display information about bootflash: file system
  call              Show Calls
  cca               CCA information
  class-map         Show QoS Class Map
  clock             Display the system clock
  compress          Show compression statistics
  dial-peer         Dial Plan Mapping Table for, e.g. VoIP Peers
  dialer            Dialer parameters and statistics
  exception         exception informations
  flash:            display information about flash: file system
  gateway           Show status of gateway
  history           Display the session command history
  hosts             IP domain-name, lookup style, nameservers, and host table
  location          Display the system location
  num-exp           Number Expansion (Speed Dial) information
  policy-map        Show QoS Policy Map
  ppp               PPP parameters and statistics
  queue             Show queue contents
  queueing          Show queueing configuration
  radius            Shows radius information
  rmon              rmon statistics 
  sessions          Information about Telnet connections
  sgcp              Display Simple Gateway Control Protocol information
  snmp              snmp statistics
  tacacs            Shows tacacs+ server statistics
  template          Template information
  terminal          Display terminal configuration parameters
  traffic-shape     traffic rate shaping configuration
  translation-rule  Show translation rule table
  users             Display information about terminal lines
  version           System hardware and software status 
  voice             Voice port configuration & stats 
uBR910 series>

Entering the same help command in privileged EXEC or global configuration mode would display a different list of show commands. The following shows how to display a list of available commands that start with "t":

uBR910 series> t? 
telnet  terminal  traceroute  tunnel
uBR910 series>

Command History Features

The CLI command history feature remembers the commands that you have entered during the current session. You can use this feature to repeat or change previous commands without retyping them. See the following sections for more information.

Displaying the Command History

To recall commands from the history buffer, use one of the commands shown in Table A-3.

Table A-3: Recalling Previous Commands

Command Purpose

Press Ctrl-P or the up arrow key.¹

Recall commands in the history buffer, beginning with the most recent command. Repeat to recall successively older commands.

Press Ctrl-N or the down arrow key.¹

Return to more recent commands in the history buffer after recalling commands with Ctrl-P or the up arrow key. Repeat to recall successively more recent commands.

show history

List the last several commands you have just entered (user EXEC mode only).

¹The arrow keys function only on ANSI-compatible terminals such as VT100s.

Command	Purpose
Press Ctrl-P or the up arrow key.¹	Recall commands in the history buffer, beginning with the most recent command. Repeat to recall successively older commands.
Press Ctrl-N or the down arrow key.¹	Return to more recent commands in the history buffer after recalling commands with Ctrl-P or the up arrow key. Repeat to recall successively more recent commands.
show history	List the last several commands you have just entered (user EXEC mode only).

Editing Previous Commands

When you display a previous command using Ctrl-P or Ctrl-N, you can edit that command to correct any errors or to change a parameter. This allows you to quickly give a series of similar commands without having to retype each command.

Table A-4 shows the most commonly used editing commands.

Table A-4: Editing Previous Commands

Command¹ Purpose

Press Ctrl-A

Move to the beginning of the line.

Press Ctrl-B

Move back one character.

Press <Esc>-B

Move back to the previous word.

Press Ctrl-D

Delete the character at the cursor position.

Press Ctrl-E

Move to the end of the line.

Press Ctrl-F

Move forward one character.

Press <Esc>-F

Move forward one word.

Press Ctrl-K

Delete all characters from the cursor to the end of the line.

Press Ctrl-U or Ctrl-X

Delete all characters from the cursor to the beginning of the line.

Press Ctrl-W

Delete a single word.

¹These editing commands are similar to those used in the EMACS text editor.

Command¹	Purpose
Press Ctrl-A	Move to the beginning of the line.
Press Ctrl-B	Move back one character.
Press <Esc>-B	Move back to the previous word.
Press Ctrl-D	Delete the character at the cursor position.
Press Ctrl-E	Move to the end of the line.
Press Ctrl-F	Move forward one character.
Press <Esc>-F	Move forward one word.
Press Ctrl-K	Delete all characters from the cursor to the end of the line.
Press Ctrl-U or Ctrl-X	Delete all characters from the cursor to the beginning of the line.
Press Ctrl-W	Delete a single word.

Note Additional editing commands are given in the Configuration Fundamentals Configuration Guide , available on CCO and the Documentation CD-ROM.

Command History Buffer Size

By default, the command history feature stores the 10 most recent commands in its history buffer. You can change the size of this buffer for the current terminal session with the terminal history command:

uBR910 series> terminal history size 20 
uBR910 series>

The terminal no history size command resets the number of lines saved in the history buffer to the default of 10 lines.

Using Output Modifiers

Many of the Cisco uBR910 series DSU's commands output a great deal of information that takes many screens to display. You can use the Cisco IOS software's output modifiers to filter the output of almost any command, so that you can display only those lines you are interested in.

The output modifier feature is invoked by using the pipe symbol (|). To use this feature, enter a command as normal but add a space and the pipe symbol at the end of the command line. Then add one of the keywords.

Table A-5: Using Output Modifiers

Command Purpose

begin regular expression

Display the first line that matches the regular expression and then all other lines that follow that line.

include regular expression

Display all lines that match the regular expression.

exclude regular expression

Display all lines except those that match the regular expression.

Command	Purpose
begin regular expression	Display the first line that matches the regular expression and then all other lines that follow that line.
include regular expression	Display all lines that match the regular expression.
exclude regular expression	Display all lines except those that match the regular expression.

The following example shows how the output from the show ip traffic command is filtered to display only those lines that include the word "error":

uBR910> show ip traffic | include error 
         0 format errors, 0 checksum errors, 1 bad hop count
  Rcvd: 0 format errors, 0 checksum errors, 0 redirects, 4 unreachable
  Total: 0/0, 0 checksum errors, 0 format errors
  Total: 0/0, Format errors: 0/0, Checksum errors: 0/0
  Rcvd: 134 total, 0 checksum errors
  Rcvd: 23 total, 0 checksum errors, 9 no port
  Rcvd: 17 total, 0 checksum errors, 1 no port

Understanding Cisco IOS Configuration Files

Cisco IOS configuration files are text files that contain Cisco IOS commands to configure the Cisco uBR910 series DSU when it boots up and is first configured. These commands are the same commands that could be given manually at the CLI interface; however, putting them in a configuration file avoids having to retype them whenever the unit is reset.

Downloading the Configuration File

Usually, the Cisco IOS configuration file is specified as part of the DOCSIS configuration file. In this situation, the service provider creates and maintains both the DOCSIS and Cisco IOS configuration files, and those files are stored on TFTP servers located at the provider's headend plant.

The Cisco uBR910 series DSU automatically loads the DOCSIS configuration file when it is connected to a cable network and powered on. If the DOCSIS configuration file specifies that a Cisco IOS configuration file is to be loaded, the Cisco uBR910 series DSU uses the TFTP protocol to download that file and then executes the file so that the non-DOCSIS routing and interface parameters are correctly configured.

When the DOCSIS configuration file specifies that a Cisco IOS configuration file should be downloaded, the Cisco uBR910 series DSU automatically takes the following steps to ensure that the configuration cannot be changed by the user at the remote site:

Step 1 Terminates any current Telnet sessions.

Step 2 Disables console access.

Step 3 Deletes the current Cisco IOS configuration, if any.

Step 4 Downloads the Cisco IOS configuration file.

Step 5 After configuring itself according to the commands in the Cisco IOS configuration file, the Cisco uBR910 series DSU comes online and starts sending traffic.

If the DOCSIS configuration file does not specify that a Cisco IOS configuration file should be loaded, the network administrator can log in to the CLI interface and manually load the file using the copy tftp command. (In this situation, console access is not disabled, allowing users at the remote site to modify the configuration if desired.)

Note The DOCSIS configuration file is a binary file that must be in the specific format given by the DOCSIS 1.0 specification; it configures DOCSIS and cable-related parameters. The Cisco IOS configuration file is a text file that can be in any arbitrary format, as long as the lines in that file contain valid commands that could be given at the CLI interface. Typically, the Cisco IOS configuration file sets routing parameters and whatever other parameters are needed for special feature sets, such as IPSec and firewall features.

Startup and Run-Time Configuration Files

The startup configuration file is a Cisco IOS configuration file stored in the system's Flash memory and is automatically run whenever the Cisco uBR910 series is reset or powered-on. When a DOCSIS configuration file specifies that a Cisco IOS configuration file should be downloaded, that Cisco IOS configuration file automatically becomes the startup configuration file.

The run-time configuration file is the Cisco IOS configuration file that the Cisco uBR910 series is currently using as it operates. When a Cisco uBR910 series DSU is first powered-on or reset, the run-time configuration file is the same as the startup configuration file.

However, when you make configuration changes to the system, either by using the CLI or by using SNMP commands, the run-time configuration file is updated with those changes. Over time, the run-time configuration file has a different configuration than the startup configuration file. Resetting the Cisco uBR910 series DSU automatically erases the run-time configuration and restores the startup configuration.

If you want to save your changes to the configuration, you must save the run-time configuration as the startup configuration file. To do so, enter the following global configuration command:

copy running-config startup-config

Note Any changes you make to either the startup or run-time configuration are automatically overwritten when the Cisco uBR910 series is rebooted if the DOCSIS configuration file specifies that a new Cisco IOS configuration file must be downloaded from the TFTP server. If this is the case, you must also manually update the Cisco IOS configuration file on the TFTP server to preserve any configuration changes you make.

To restore the startup configuration without resetting the Cisco uBR910 series, give the following global configuration command:

copy startup-config running-config

Displaying the Configuration Files

The startup and run-time configuration files can be displayed with the following global configuration commands:

show startup-config 
show running-config

The Cisco uBR910 series DSU displays the appropriate configuration file in a format that you can capture and save on a TFTP server so it can be downloaded to another Cisco uBR910 series DSU.

Note The configuration files do not contain any commands that restore the Cisco uBR910 series to its default values. For example, if you enable IP routing with the "ip routing" command, this is not saved in the configuration files because this is the default configuration. However, if you disable IP routing with the "no ip routing" command, this is saved in the configuration file.

The show command uses exclamation marks (!) to create blank lines as spacers. These extra lines do not affect the functionality of the Cisco uBR910 series but exist only to make the configuration files more readable.

File Format

The Cisco IOS configuration file is an ASCII text file that contains any Cisco IOS configuration commands to configure the Cisco uBR910 series DSU. The Cisco uBR910 series is automatically put into the global configuration mode when the file is executed, but if you use any commands for any other command modes, you must give the appropriate global configuration command to enter that other command mode first.

For example, to configure the cable interface on the Cisco uBR910 series DSU, you must first enter interface mode with the following command:

interface cable 0

You can use exclamation marks (!) to create comments and blank lines in your own configuration files. These comments and blank lines are not preserved when the file is loaded into the Cisco uBR910 series. However, they are useful for communicating information to other administrators who might be working with the files on the TFTP server.

Useful Commands

Table A-6 lists some of the most commonly used commands for the Cisco uBR910 series DSU.

Table A-6: Useful Commands

Command Command Mode Purpose

banner

global configuration

Displays and configures the login banners that appear when a user first logs in and when a user moves to a different command mode.

configure terminal

user EXEC

Enters global configuration mode.

copy startup-config running-config

global configuration

Configures the Cisco uBR910 series with its boot-up configuration file.

enable

user EXEC

Enters privileged EXEC mode.

exit

all modes

Leaves the current command mode and returns to the next higher level. If currently in user EXEC mode, logs you out of the Cisco uBR910 series DSU.

hostname

global configuration

Sets the hostname.

logout

user EXEC

Logs out of user EXEC mode and the Cisco uBR910 series DSU.

show flash

user EXEC

Displays the content of the Flash memory, which contains the Cisco IOS software image that was loaded.

show history

user Exec

Displays the most recently entered commands.

show interfaces

user EXEC

Displays the configuration and status of each of the Cisco uBR910 series interfaces.

show ip arp

user EXEC

Displays the contents of the current Address Resolution Protocol (ARP) table.

show ip dhcp server statistics

user EXEC

Displays the contents of the DHCP database.

show ip interface

user EXEC

Displays the IP configuration and status for the serial and cable interfaces.

show ip protocols

user EXEC

Displays the IP routing protocol parameters and status.

show ip rip database

user EXEC

Displays the contents of the Routing Information Protocol (RIP) database.

show ip route

user EXEC

Displays the contents of the current IP routing table.

show ip traffic

user EXEC

Displays statistics for the IP traffic sent through the Cisco uBR910 series DSU.

show protocols

user EXEC

Displays the currently configured protocols for each interface.

show running-config

privileged EXEC

Displays the active configuration.

show startup-config

privileged EXEC

Displays the configuration loaded into the Cisco uBR910 series at boot-up.

show version

user EXEC

Displays the Cisco uBR910 series software and hardware versions.

Command	Command Mode	Purpose
banner	global configuration	Displays and configures the login banners that appear when a user first logs in and when a user moves to a different command mode.
configure terminal	user EXEC	Enters global configuration mode.
copy startup-config running-config	global configuration	Configures the Cisco uBR910 series with its boot-up configuration file.
enable	user EXEC	Enters privileged EXEC mode.
exit	all modes	Leaves the current command mode and returns to the next higher level. If currently in user EXEC mode, logs you out of the Cisco uBR910 series DSU.
hostname	global configuration	Sets the hostname.
logout	user EXEC	Logs out of user EXEC mode and the Cisco uBR910 series DSU.
show flash	user EXEC	Displays the content of the Flash memory, which contains the Cisco IOS software image that was loaded.
show history	user Exec	Displays the most recently entered commands.
show interfaces	user EXEC	Displays the configuration and status of each of the Cisco uBR910 series interfaces.
show ip arp	user EXEC	Displays the contents of the current Address Resolution Protocol (ARP) table.
show ip dhcp server statistics	user EXEC	Displays the contents of the DHCP database.
show ip interface	user EXEC	Displays the IP configuration and status for the serial and cable interfaces.
show ip protocols	user EXEC	Displays the IP routing protocol parameters and status.
show ip rip database	user EXEC	Displays the contents of the Routing Information Protocol (RIP) database.
show ip route	user EXEC	Displays the contents of the current IP routing table.
show ip traffic	user EXEC	Displays statistics for the IP traffic sent through the Cisco uBR910 series DSU.
show protocols	user EXEC	Displays the currently configured protocols for each interface.
show running-config	privileged EXEC	Displays the active configuration.
show startup-config	privileged EXEC	Displays the configuration loaded into the Cisco uBR910 series at boot-up.
show version	user EXEC	Displays the Cisco uBR910 series software and hardware versions.

Table of Contents

Using Cisco IOS Software