CCNA learning: Cisco IOS Command and Config

Cisco ISO: network operation system

xxxx-yyy-ww:

xxxx: platform (ex, 1005, 1600,3640)

yyy: features (ex, n --> IPX; i --> IP subnet)

ww: format (ex, f --> flash; m--> RAM; z --> zipped)

Cisco: command screen

Command mode

user mode:      hostname>

super mode:    hostname#

config mode:  hostname(config)#

Switcher signal lights

1. start, all signal lights green

2. port POST successfully, light off; port POST failed, light yellow

3. all ports POST successfully lights off; all ports POST failed lights yellow

Switcher startup console information: device information...

Go to user mode: press K

Go to super mode: enable

Go to user mode: quit

Switcher check status:

show version

show running-config

show interfaces

Config mode

Go to config mode: conf term

Go to interface config mode: interface e0/1

config hostname: (config)#hostname <hostname>

config start message: (config)#banner motd # Accounting......#

config interface description: (config-if)#description Engineer......

config console password:

(config)#line console 0

(config-line)#login

(config-line)#password <password>

config telnet password:

(config)#line vty 0 4

(config-line)#login

(config-line)#password <password>

config super mode open passowrd:                             (config)#enable password <password>

config super mode encrypt password(priority high):  (config)#enable secret <password>

disable session auto exit:

(config)#line console 0

(config-line)#exec-timeout 0 0

prevent unformat:

(config)#line console 0

(config-line)#logging synchronous

recommand not to use setup guide

find command or detail of command: <command> ?

Command a bit long: when over one line, start will show $

<Ctrl + A>: Move to start

<Ctrl + E>: Move to end

<Esc + B>: back one word

<Ese + F>: forward one word

<Ctrl +B>: back one character

<Ctrl + F>: forward one character

<Ctrl + D>: Delete one character

Up arrow: recall recent command

Down arrow: recall command

show history: list command history

terminal history size <lines>: set command save area size

Serial Port Setting

#configure term

(config)#interface serial 0

(config-if)#clock rate 64000

(config-if)#quit

(config)#quit

#show interface serial 0

close port

#configure term

(config)#interface serial 0

(config-if)#shutdown

open port

#configure term

(config)#interface serial 0

(config-if)#no shutdown

check port status

#show interface serial 1

Serial1 is up, line protocol is up: layer 1 up and layer 2 up

Serial1 is up, line protocol is down: layer 1 up and layer2 down

Reason: DCE clock rate not setting

Serial1 is down, line protocol is down: layer 1 down and layer 2 down

Reason:

1. cable not connect or cable broke

2. Port is disable by administrator

check device DCE or DTE

#show controller serial 0