Monday, March 7, 2016

Cisco IOS Commands Cheat Sheet Part#1


Zona Networking - Beberapa waktu yang lalu saya iseng - iseng browsing eh nemu beginian :D
Yap ane nemu cheat sheet dari perintah - perintah (commands) IOS cisco. Jika kalian sedang belajar atau mengikuti ujian CCNA pasti perintah - perintah dibawah ini akan sering kalian gunakan baik di router atau di switch. 
Tapi perintah - perintah yang akan saya share menggunakan bahasa Inggris jadi jika kalian kurang paham silakan di translate sendiri hehe :v. Cekidot!


Router Modes:
•Router>: User mode = Limited to basic monitoring commands
•Router#: Privileged mode (exec-level mode) = Provides access to all other router commands
Router(config)#: global configuration mode = Commands that affect the entire system
Router(config-if)#: interface mode = Commands that affect interfaces
Router(config-subif)#: subinterface mode = Commands that affect subinterfaces
•Router(config-line)#: line mode = Commands that affect in lines modes (console, vty, aux…)
•Router(config-router)#: router configuration mode

Changing switch hostname:
Switch(config)# hostname SW1
Configuring passwords:
SW1(config)# enable secret cisco    ! MD5 hash
SW1(config)# enable password notcisco    ! Clear text

Securing console port:
SW1(config)# line con 0
SW1(config-line)# password cisco
SW1(config-line)# login
 
Securing terminal lines:
SW1(config)# line vty 0 4
SW1(config-line)# password cisco
SW1(config-line)# login
Encrypting passwords:
SW1(config)# service password-encryption

Configuring banners:
SW1(config)# banner motd $
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
UNAUTHORIZED ACCESS IS PROHIBITED
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
$

Giving the switch an IP address:
SW1(config)# interface vlan 1
SW1(config-if)# ip address 172.16.1.11 255.255.255.0    ! or DHCP
SW1(config-if)# no shutdown
Setting the default gateway:
SW1(config)# ip default-gateway 172.16.1.1

Saving configuration:
SW1# copy running-config startup-config
Destination filename [startup-config]?    ! Press enter to confirm file name.
Building configuration…
[OK]

! Short for write memory.
SW1# wr
Building configuration…
[OK]

Working environment:
name lookup, history, exec-timeout and logging behavior…, also valid for line con 0.
SW1(config)# no ip domain-lookup
SW1(config)# line vty 0 4
SW1(config-line)# history size 15
SW1(config-line)# exec-timeout 10 30
SW1(config-line)# logging synchronous

Configuring switch to use SSH:
•    Configure DNS domain name:
SW1(config)# ip domain-name example.com
•    Configure a username and password:
SW1(config)# username admin password cisco
•    Generate encryption keys:
The size of the key modulus in the range of 360 to 2048
SW1(config)# crypto key generate rsa
How many bits in the modulus [512]: 1024

•    Define SSH version to use:
SW1(config)# ip ssh version 2
•    Enable vty lines to use SSH:
SW1(config)# line vty 0 4
SW1(config-line)# login local
! You can set vty lines to use only telnet or only ssh or both as in the example.
SW1(config-line)# transport input telnet ssh

Aliases:
Used to create shortcuts for long commands.
SW1(config)# alias exec c configure terminal
SW1(config)# alias exec s show ip interface brief
SW1(config)# alias exec sr show running-config

Description, speed and duplex: 
SW1(config)# interface fastEthernet 0/1
SW1(config-if)# description LINK TO INTERNET ROUTER
SW1(config-if)# speed 100    ! Options: 10, 100, auto
! The range keyword used to set a group of interfaces at once.
SW1(config)# interface range fastEthernet 0/5 – 10
SW1(config-if-range)# duplex full (options: half, full, auto)

Verify Basic Configuration:
•    Shows information about the switch and its interfaces, RAM, NVRAM, flash, IOS, etc.
SW1# show version
•    Shows the current configuration file stored in DRAM.
SW1# show running-config
•    Shows the configuration file stored in NVRAM which is used at first boot process.
SW1# show startup-config
•    Lists the commands currently held in the history buffer.
SW1# show history
•    Shows an overview of all interfaces, their physical status, protocol status and ip address if assigned.
SW1# show ip interface brief
•    Shows detailed information about the specified interface, its status, protocol, duplex, speed, encapsulation, last 5 min traffic.
SW1# show interface vlan 1
•    Shows the description of all interfaces
SW1# show interfaces description
•    Shows the status of all interfaces like connected or not, speed, duplex, trunk or access vlan.
SW1# show interfaces status
•    Shows the public encryption key used for SSH.
SW1# show crypto key mypubkey rsa
•    Shows information about the leased IP address (when an interface is configured to get IP address via a dhcp server)
SW1# show dhcp lease

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