Cisco IOS

• Basic Commands
• Housekeeping
• Troubleshooting

Basic Commands

User mode

Router>
Router> ?
Router> sh?
Router> show ?

Privileged mode (level 15, 1-14 are configurable)

router> enable 14
router> enable
router> disable

Most of our job, configuration. Commands here will affect Router as a whole.

Router> enable
Router# configure terminal
Router(config)# exit

Avoid mistyping 'Translating ... domain server'/

Router(config)# hostname test
no ip domain-lookup
exit

Set encryption

Router(config)# enable secret <word>

Set password

Router(config)# enable password <level> <pwd>

Show config log (commands executed)

show running-config

Try get back in privileged mode

Router> enable
<secret>

Changing the Router log

Router(config)# line console 0
Router(config-line)# exec-timeout 0 20 // 0 minutes, 20 seconds -> logout
Router(config-line)# no exec-timeout // disable
end

Keep console logs from interrumpting comand line

enable
configure terminal
line console 0
logging synchronous
end

Creating a login password for logging into the router

enable // privilege mode
configure terminal // cofig
line console 0 // config-line
password test
login
exit // config mode
exit // privilege mode
logout

Hide passwords

service password-encryption

Configure console for different ports (each port is a 'line')

enable
configure terminal
line vty 0 15 // configure, virtual lines for remote consoles, 0 to 15

Make configuration persistent

copy running-config startup-config
copy run start // equals
write memory // equals
wr //equals

House keeping commands

en
conf t
host <name>
no ip domain-lookup
line con 0
logg sync
no exec-time
end

Troubleshooting

Show interfaces

show interfaces brief

Ping

ping <destinationIP>

IP Route Table

show ip route

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