Cisco Systems



Basic Configurations

Configuration Modes

Modes
  • User
  • Privileged
  • Global Configuration
  • Specific Configuration
  • Setup mode (Interactive configuration dialog)
Modes prompts
  • User mode : Router>
  • Privileged mode : Router#
  • Global Configuration mode : Router(config)#
  • Specific Configuration mode : Router(config-specific)#

Global Configurations

Switch(config)#hostname newname Rename Device

Switch(config)#hostname Lab-Switch
Lab-Switch(config)#

banner motd # mon mot de bienvenue# Display message fefore CLI access

Display time
Switch#sh clock
*0:0:19.387 UTC Mon Mar 1 1993

Lab-CCNA#clock set hh:mm:ss month dd yyyy Set Time

Lab-CCNA#clock set 20:10:30 October 12 2023

Set a gateway on Switch
S2(config)#ip default-gateway 192.168.1.1

Create Local Users
username name password pass

username name privilege 15 secret pass
create a local user with level 15 privilege which allow him direct access in privilege mode

Privileged Mode Security

Secure privileged mode access:
enable password passname or
enable secret passname (more secured than the first)

service password-encryption Encrypt all passwords on device

show history Shows last 20 commands entered by default

show terminal Shows terminal configurations and history buffer size

Lab-Switch#terminal history size 256 Changes buffer size (max 256)

Configuration Files

Files

running-configuration
startup-configuration

Commands

show running-configuration
show startup-configuration
copy running-config startup-config: save changes
erase startup-config: erase all configurations
erase nvram: erase all configurations
copy running-config tftp Les fichiers de configuration peuvent être stockés sur un serveur TFTP (Trivial File Transfer Protocol) ou sur un support conservé en lieu sûr, par exemple un CD-ROM, une clé USB ou une disquette.

Line console Configuration

Line Console Channels

  • line console 0 (Direct Access)
  • line vty 0-15 (16 Remote access Channels)


Console Settings

Lab-Switch(config)#line console 0 Access line console 0 specific Configuration

Lab-Switch(config-line)#exec-timeout min secondes
You can set the console to go from never timing out (0 0) to timing out in 35,791 minutes and 2,147,483 seconds. Remember that the default is 10 minutes.

Lab-Switch(config-line)# logging synchronous
Synchroniser la sortie du terminal et la ligne de commande pour éviter que les messages syslog dérangent la commande en cours

Lab-Switch(config-line)#password password Set console access password

Lab-Switch(config-line)#login Set console Access by password authentication

Lab-Switch(config-line)#login local Set console Access by local user account authentication

Example Lab-Switch(config)#line console 0
Lab-Switch(config-line)#exec-timeout 0 0


Console Access

Setting Console Access with local user account Authentication





Setting Console Access (Simple Authentication with a password)

Lab-Switch(config)#line console 0
Lab-Switch(config-line)#password password
Lab-Switch(config-line)#login

Telnet

Setting Telnet (Simple Authentication with a password)

line vty 0 n
password passname
login

Setting Telnet with local user account Authentication

line vty 0 n
login local
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