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Basic Cisco IOS commands

Modes

Level
Mode
Prompt
1
user EXEC
Switch>
2
Privileged EXEC
Switch#
3
Global Config
Switch­(co­nfig)#
4a
Interface Config
Switch­(co­nfi­g-if)#
4b
Line Config
Switch­(co­nfi­g-l­ine)#

Keyboard Shortcuts

Up Arrow
Automa­¬≠ti­cally re-types last command
Ctrl+S­hift+6
Oh crap, stop! (Cancels whatever it's currently doing)
Ctrl+C
Exits config mode
Ctrl+Z
Applies current command & returns to priv. EXEC mode
Ctrl+U
Erases anything on current prompt line
Tab
Completes abbrev­iated command

"­Sho­w" Command

Command
Inform­ation Displayed
show version
IOS version, memory capacity, etc.
show mac-ad­dress table
MAC address table
show ip route
routing table
show interface g0/0
status, MAC, IP, etc. for Gigait­Eth­ernet 0/0
show ip interface brief
name, IP, status, etc. (all interf­aces)

General Commands

Short Command
Complete Command
Function
en
enable
user EXEC > priv. EXEC
conf t
config terminal
priv. EXEC > global config
int
interface
global config > interface config
li
line
global config > line config
sh run
show runnin­g-c­onfig
shows current config
cop r s
copy runnin­g-c­onfig startu­p-c­onfig
saves current config
no ip dom lo
no ip domain­-lookup
keeps router from trying to read bad commands as host names
era star [Tab]
erase startu­p-c­onfig
Resets Config
del vlan.dat
delete vlan.dat
Reset VLAN configs
 

Initial Config­uration (Switches and Routers)

Command
From Mode
What It Does
hostname xyz
global config
sets hostname to xyz
enable secret xyz
global config
sets encrypted password for priv. EXEC to xyz
service passwo­rd-­encrypt
global config
encrypts all passwords
line console 0
global config
enters line mode for console
line vty 0 15
global config
enters line config mode for 16 vty lines
password xyz
line config
sets line password to xyz
login
line config
enables users to login
int vlan 1
global config
enters interface config mode for vlan 1
ip address [IP] [Subnet]
interface config
sets IP address
no shut
interface config
turns on interface
banner motd #Text Here#
global config
sets motd banner

Router­-Sp­ecific Config­uration Commands

Command
From Mode
Function
interface g0/1
global config
enters interface config for Gigabi­tEt­hernet 0/1
ip address IP/prefix
interface config
sets interf­ace's IPv4 address
no shut
interface config
turns on the interface
descri­ption descri­ption text
interface config
used to document info about the interface
ipv6 address IP/prefix
interface config
sets interf­ace's IPv6 address
`ipv6 address IP/prefix link-local
interface config
sets interf­ace's IPv6 link-local address
ipv6 unicas­t-r­outing
global config
enables IPv6 routing

Other Commands

Command
From Mode
Function
sdm pre dual def
global config
used if switch won't take IPv6 address
           
 

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