The first stage of Linux operation and Maintenance course Summary (iii) CISCO

A summary of the first-stage heavy difficulties notes (III.) Cisco

First, Introduction: IOS(internetwork Operating System), which is typically configured through a text-based command lineINTERFACE,CLI.

• 1. Basic operation:

Operation mode Switching

A user mode:router> typically view statistics

b Privileged mode:router>enable

router# # Viewing and modifying the configuration of a router

Router#disable

C Global configuration mode:router#configuration terminal

Router (config) #exit (ctrl + Z)

2, Help and command completion:? and <tab> keys

3. Supported shortcut keys:ctrl+u,ctrl+e,ctrl+a

4. History command:#show Terminal # View terminal configuration with history command save number

#show History # View Historical Commands

# Press the up and down keys of the arrow keys to toggle the commands of the most recent operation

#terminal history size? # can modify history command to save the number of bars

#show version

• Password management for routers and switches:

1. Set host name:R1 (config) #hostname SC

2. to set login prompt information:

A defines the date information marker #banner MOTD i (i is a segmentation qualifier, which can be any character )

B Define Login information tag #banner login I

3. Set Password:

interface:console port (local interface, no password can be managed), Virtual interface password (TELNET,SSH), aux interface.

A set the privileged mode password:

R1 (config) #enable password 123 set privileged non-secret password

R1 (config) #enable secret 456 set privileged encryption password

b setting the console interface login password

R1 (config) #line console 0

R1 (config-line) #password 123

R1 (config-line) #login enable password check, let the password take effect, if no password will be error

R1 (config-line) #exec-timeout 0 0 Set the reply time -out time, the format is 0 minutes 0 seconds, the default of no operation will be kicked out

R1 (config-line) #logging Synchronous block console information to avoid disturbing command input

C setting TELNET login Password

R1 (config) #line vty 0 15

R1 (config) #password 123

R1 (config) #login (no login means allow telnet without password login, not allowed)

d Password Encryption

R1 (config) #service password-encryption to enable encryption service, all passwords are ciphertext saved

4. SSH login

R1 (config) #hostname SC

SC (config) #ip domain-name lamp

Sc#clock set 23:32:17 9 Apr # Set the hostname and time of the host name, use when generating the key

SC (config) #crypto key generate RSA # generates the encryption key, uses RSA encryption, generates the 768 key , if the number of bits is less than the bit, cannot use 2 Generation Ssh

SC (config) #aaa new-model# enable AAA mode (authentication\authorization\accounting, authentication, authorization, bookkeeping)

SC (config) #username cisco password cisco# set user name and password

SC (config) #ip ssh time-out 120# set time-out

SC (config) #ip ssh authentication-retries 5 # Set maximum number of failures

SC (config) #ip SSH version 2

SC (config) #line vty 0 15

SC (config) #transport input ssh# only allow SSH login, Telnet must set the privileged mode password, otherwise you cannot log in

The first stage of Linux operation and Maintenance course Summary (iii) CISCO