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Basic Command
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All
Command
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Router
> ?
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To
get to Privileged Mode
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Router
> enable
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To
get back to User Mode
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Router
# disable
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To
set the command buffer size
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Router
> terminal history size
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To
disable advanced editing features
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Router
> terminal no editing
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To
show the command buffer
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Router
> show history
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Enter
global configuration mode
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Router
# config t
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View
IOS version
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Router
# show version
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Display
interfaces on router and their status
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Router
# show interface
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Check
interface status
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Router
# show ip interface brief
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Display
ip protocol info
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Router
# show ip protocol
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Display
which protocols are configured on the router
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Router
# show protocol
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View
IOS version, size of IOS, and free space in FLASH
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Router
# show flash
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View
current configuration file (RAM)
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Router
# show running-config
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View
saved configuration file (NVRAM)
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Router
# show startup-config
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View
CPU utilization
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Router
# show processes cpu
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View
info about programs in RAM
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Router
# show processes
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Reboot
the router and reload the startup config from NVRAM
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Router
# reload
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Disable
IP routing on a router (enabled by default)
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Router(config)
# no ip routing
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Give
the router a hostname
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Router(config)#
hostname Router1
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To move
to the beginning of the command line
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Ctrl+A
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To
move to the end of the command line
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Ctrl+E
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To
move forward one character
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Ctrl+F
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To
move back one character
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Ctrl+B
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To
move forward one word
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Ctrl+W
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To
erase a line
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Ctrl+U
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To
redisplay a line
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Ctrl+R
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Ends
configuration mode and returns to privileged mode
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Router
# Ctrl+Z
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View
the IP routing table
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Router
# show ip route
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View
RIP Debug
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Router
# debug ip rip
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View
IGRP Debug
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Router
# debug ip igrp events
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Disable
RIP routing
Backup
IOS to file server
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Router(config)
# no router rip
Router
# copy flash tftp
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Upgrade
the IOS from the file server
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Router#copy tftp flash
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Copy
running config file from RAM to TFTP
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Router
# copy running-config tftp
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Copy
startup config file from TFTP to RAM
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Router
# copy tftp running-config
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Copy
startup config file from TFTP to NVRAM
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Router
# copy tftp startup-config
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Erase
the configuration file in NVRAM [run initial config dialog]
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Router
# erase startup-config
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Tell
router which IOS file in Flash to boot from
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Router(config)#
boot system flash (ios_filename)
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Tell
router which IOS to request from the TFTP server (fallback)
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Router(config)
# boot system tftp (ios_filename) tftp_ip_address
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Tell
router to boot from IOS in ROM
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Router(config)
# boot rom
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Passwords
can be encrypted
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(Router
config) # service password-encryption
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To
de-encrypt the passwords
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(Router
config) # no service password-encryption
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