Term
Router Configuration Modes
Router> |
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Definition
Limited to basic monitoring commands
Mode
User EXEC mode |
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Term
Router Configuration Modes
Router# |
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Definition
Provides access to all other router commands
Mode
Privileged EXEC mode |
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Term
Router Configuration Modes
Router(config)# |
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Definition
Commands that affect the entire system
Mode
Global configuration mode |
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Term
Router Configuration Modes
Router(config-subif)# |
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Definition
Commands that affect interfaces, subinterfaces,routing processes, or lines
Specific configuration
modes
only |
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Term
Moving Between Modes
Router>
enable |
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Definition
| Changes from user EXEC to privileged EXEC mode |
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Term
Moving Between Modes
Router#
disable |
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Definition
| Changes to user EXEC from privileged EXEC mode |
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Term
Moving Between Modes
Router#
config term |
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Definition
| Changes to global configuration mode from privileged mode |
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Term
Moving Between Modes
Router(config)
#exit |
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Definition
| Exits from any configuration mode to privileged mode (Ctrl+Z is also commonly used) |
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Term
| Moving Between Modes
Router(config)#
interface |
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Definition
| Enters interface configuration mode from global configuration mode |
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Term
| Moving Between Modes
Router(config)#
interface |
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Definition
| Enters subinterface configuration mode from global configuration mode |
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Term
| Moving Between Modes
Router(config)#
line |
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Definition
| Enters line configuration mode from globalconfiguration mode |
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Term
Moving Between Modes
Router(config)#
router eigrp 1 |
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Definition
| Enters router configuration mode from global configuration mode |
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Term
CLI Editing Commands
Ctrl+P or Up arrow |
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Definition
| Shows last command entered |
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Term
CLI Editing Commands
Ctrl+N or Down arrow |
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Definition
| Shows previous commands entered |
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Term
CLI Editing Commands
show history |
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Definition
| Shows last 10 commands entered by default |
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Term
CLI Editing Commands
show terminal |
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Definition
| Shows terminal configurations and history buffer size |
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Term
CLI Editing Commands
terminal history size |
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Definition
Changes buffer size
(the maximum is 256) |
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Term
CLI Editing Commands
Ctrl+A |
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Definition
| Moves your cursor to the beginning of the line |
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Term
CLI Editing Commands
Ctrl+E |
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Definition
| Moves your cursor to the end of the line |
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Term
CLI Editing Commands
Esc+B |
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Definition
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Term
CLI Editing Commands
Ctrl+B |
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Definition
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Term
CLI Editing Commands
Ctrl+F |
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Definition
| Moves forward one character |
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Term
CLI Editing Commands
Esc+F |
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Definition
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Term
CLI Editing Commands
Ctrl+D |
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Definition
| Deletes a single character |
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Term
CLI Editing Commands
Backspace |
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Definition
| Deletes a single character |
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Term
CLI Editing Commands
Ctrl+R |
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Definition
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Term
CLI Editing Commands
Ctrl+U |
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Definition
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Term
CLI Editing Commands
Ctrl+W |
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Definition
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Term
CLI Editing Commands
Ctrl+Z |
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Definition
| Ends configuration mode and returns to EXEC mode |
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Term
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Definition
| Finishes typing a command for you |
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Term
Online Help Commands
Router#
? |
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Definition
| Shows all available commands |
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Term
Online Help Commands
Router#
c? |
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Definition
| Shows all available commands beginning with the letter c |
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Term
Online Help Commands
Router#
clock ? |
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Definition
Shows all available options for the
clock
command |
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Term
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Definition
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Term
Pipe Commands
Router#
sh running-config | ? |
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Definition
Shows the options for the pipe command.
These include the ability to
begin, include, exclude, and so on. |
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Term
Pipe Commands
Router#
sh run | begin interface |
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Definition
Shows the running configuration,
beginning at the interface
configurations. |
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Term
Pipe Commands
Router#
sh ip route | include 192.168.3.32 |
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Definition
Shows all entries in the IP routing
table that include the IP address
192.168.3.32 |
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Term
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Definition
| The pipe (|) allows you to wade through all the configurations or other long outputs and get straight to your goods fast. |
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Term
Hostname
Router(config)#
hostname name |
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Definition
| Sets the hostname of this router |
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Term
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Definition
You can set the identity of the router with the hostname command. This is only locally significant,
which means it has no bearing on how the router performs name lookups or how the router works
on the internetwork. |
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Term
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Definition
You can create a banner to give anyone who shows up on the router exactly the information you
want them to have. Make sure you’re familiar with these four available banner types: exec process
creation banner, incoming terminal line banner, login banner, and message of the day banner |
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Term
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Definition
If the router has no initial configuration, you will be prompted to use setup mode to establish
an initial configuration. You can also enter setup mode at any time from the command line by typing the command
setup
from something called privileged mode.
Setup mode covers only some global commands and is generally just not helpful. |
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Term
Banners
Router(config)#
banner motd # |
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Definition
Enters a banner MOTD message and ends the message with the # character
The MOTD banner will be displayed whenever anyone attaches to the
router, regardless of how they access the router. |
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Term
Banners
Router(config)#
banner exec # |
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Definition
Enters a banner exec message and ends the message with the # character.
You can configure a line activation (exec) banner to be displayed when an
EXEC process (such as a line activation or incoming connection to a VTY line) is created. By simply starting a user exec session through a console port, you’ll activate the exec banner. |
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Term
Banners
Router(config)#
banner incoming # |
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Definition
Enters a banner incoming message and ends the message with the # character.
You can configure a banner to be displayed on terminals connected to reverse Telnet lines. This banner is useful for providing instructions to users who use reverse Telnet. |
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Term
Banners
Router(config)#
banner login # |
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Definition
Enters a banner login message and ends the message with the # character
You can configure a login banner to be displayed on all connected terminals.
This banner is displayed after the MOTD banner but before the login prompts. The login banner can’t be disabled on a per-line basis, so to globally disable it, you have to delete it with the
no banner login
command. |
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Term
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Definition
You can use five passwords to secure your Cisco routers: console, auxiliary, Telnet (VTY),enable password, and enable secret.
However, other commands are necessary to complete the password configurations on a router or switch |
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Term
Passwords
Todd(config)#
enable password todd |
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Definition
| Sets the enable password to Todd. |
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Term
Passwords
Todd(config)#
enable secret todd |
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Definition
Sets the enable secret password to Todd.
Supersedes the enable password. |
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Term
Passwords
Todd(config)#
line line |
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Definition
Changes to line mode to configure the
console, aux, and VTY (Telnet). |
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Term
Passwords
Todd(config-line)#password password |
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Definition
| The line password for aux, console, and VTY (Telnet) are all set in line configuration mode. |
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Term
Passwords
Todd(config-line)#
login |
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Definition
| When a line is configured to use a password,the login command must be set to prompt for login. |
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Term
Passwords
Todd(config)#
service password-encryption |
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Definition
| Encrypts the passwords in the clear-text configuration file (both running-config and startup-config). |
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Term
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Definition
Secure Shell, creates a more secure session than the Telnet
application that uses an unencrypted data stream. SSH uses encrypted keys to send data so that your username and password are not sent in the clear. |
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Term
Secure Shell (SSH)
ip domain-name Lammle.com |
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Definition
| Sets your domain name. You must set this. |
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Term
Secure Shell (SSH)
crypto key generate rsa general-keys modulus |
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Definition
| Sets the size of the key up to 2048. |
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Term
Secure Shell (SSH)
ip ssh time-out |
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Definition
| Sets the idle timeout up to 120 seconds. |
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Term
Secure Shell (SSH)
ip ssh authentication-retries |
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Definition
| Sets the max failed attempts up to 120. |
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Term
Secure Shell (SSH)
line vty first-line last_line |
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Definition
| Chooses your VTY lines to configure. |
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Term
Secure Shell (SSH)
transport input ssh telnet |
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Definition
Tells the router to use SSH and then Telnet. You do not need the telnet command at the end of the line, but if
you don’t use it, only SSH will work on the router. |
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Term
Router Interface Commands
Todd(config)#
interface fastethernet slot/port |
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Definition
| Enters interface configuration mode from global configuration mode. |
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Term
Router Interface Commands
Todd(config)#interface serial slot/port |
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Definition
Same as interface fastethernet
slot/port
except for serial interface 0/0/0 rather than Fast Ethernet interface. |
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Term
Router Interface Commands
Todd(config-if)#shutdown |
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Definition
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Term
Router Interface Commands
Todd(config-if)#no shutdown |
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Definition
| Enables an interface that is shut down. |
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Term
Router Interface Commands
Todd(config-if)#ip address address
mask |
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Definition
Configures an interface with an IP address and a
subnet mask. |
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Term
Router Interface Commands
Todd(config-if)#ip address address
mask secondary |
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Definition
| Adds a secondary IP address to an interface. |
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Term
Router Interface Commands
Todd(config-if)#description
description |
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Definition
| Adds a description to an interface. |
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Term
Router Interface Commands
Todd(config-if)#clock rate rate |
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Definition
Sets the clock rate of a serial interface in bits per
second. |
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Term
Router Interface Commands
Todd(config-if)#bandwidth rate |
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Definition
Sets the bandwidth of an interface in kilobits per
second. |
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Term
Router Interface Commands
Todd#show interface interface |
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Definition
| Displays the status and configuration of the FastEthernet interface. |
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Term
Router Interface Commands
Todd#clear counters interface |
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Definition
| Clears the display counters on the serial interface. |
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Term
Router Interface Commands
Todd#sh ip interface interface |
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Definition
| Displays the layer-3 properties of an interface. |
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Term
Router Interface Commands
Todd#sh ip int brief |
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Definition
| Displays the IP interfaces in a summarized table. This is one of the most useful "show" commands! |
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Term
Commands to Manipulate Configurations
Todd#
copy running-config startup-config |
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Definition
| Saves the running configuration to NVRAM |
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Term
Commands to Manipulate Configurations
Todd#
show running-config |
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Definition
| Shows the running configuration on the terminal |
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Term
Commands to Manipulate Configurations
Todd#
show startup-config |
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Definition
| Shows the start-up configuration (in NVRAM) on the terminal |
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Term
Commands to Manipulate Configurations
Todd#
erase startup-config |
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Definition
| Erases the configuration stored in NVRAM |
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Term
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Definition
| The best way to verify your configuration |
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Term
Show Command
show running config |
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Definition
| This shows the configuration that router is using. |
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Term
Show Command
show startup-config |
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Definition
This shows the configuration that the router will use when the
router is reload. |
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Term
Show Command
show interface |
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Definition
| This shows the status of all interfaces. |
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Term
Show Command
show ip interface |
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Definition
| This shows the default IP configuration on all interfaces. |
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Term
Show Command
show ip interface brief |
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Definition
| This command provides a quick overview of the router’s interfaces, including the logical address and status. |
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Term
Show Command
show protocols |
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Definition
| This shows the status of layers 1 and 2 of each interface as wellas the IP addresses used. |
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Term
Show Command
show controllers |
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Definition
| This shows whether an interface is a DCE or DTE interface. |
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