Command Modes
| Mode | Sample Prompt | What is Allowed |
|---|---|---|
| User EXEC | Router1> | View Settings |
| Privilege EXEC | Router1# | View and change settings |
| Global Configuration | Router1(config)# | Change settings for the whole router (global) |
| Other/Sub Configuration | Router1(config-if)# Router1(config-line)# Router1(config-subif)# Router1(config-router)# …. |
Change settings specific to interfaces, terminal lines, sub-interfaces, routing etc., |
Navigating from User EXEC to Privilege EXEC
Router1> enable Router1#
(If password has been set you will be asked for it when you type enable)
Navigating from Privilege EXEC to Global Configuration Mode
Router1# configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router1(config)#
Setting Password for Privilege EXEC (Enable Password)
Router1(config)# enable password abcd1234
(Password is visible in cleartext when running configuration is displayed)
Setting Password with Encryption
Router1(config)# enable secret abcd1234
(Password is encrypted and is not human readable when running configuration is displayed)
Changing hostname
Router1(config)# hostname OTGRouter
Save configuration changes
OTGRouter# copy running-config startup-config
View running configuration
OTGRouter# show running-config
Setting an alias
OTGRouter(config)# alias exec c configure terminal
This sets an alias for the command ‘configure terminal’ as simply ‘c’
Getting help
OTGRouter# ?
This gives general help.
OTGRouter# show ?
This gives the options available for show command.
Configuring an Interface
OTGRouter# configure terminal Enter configuration commands, one per line. End with CNTL/Z OTGRouter(config)# interface FastEthernet0/0 OTGRouter(config-if)# speed 100 OTGRouter(config-if)# duplex full OTGRouter(config-if)# ip address 172.100.1.1 255.255.255.0 OTGRouter(config-if)# no shutdown
This sets the speed, duplex and IP Address of physical interface FastEthernet0/0. The last command no shutdown makes this interface up and running.
Setting a static route
OTGRouter(config)# ip route 172.200.0.0 255.255.0.0 172.100.1.2
This means 172.100.1.2 is the gateway to the 172.200 sub network
Configuring RIP
OTGRouter(config)# ip routing OTGRouter(config)# router rip OTGRouter(config-router)# version 2 OTGRouter(config-router)# no auto-summary OTGRouter(config-router)# network 172.100.10.0 OTGRouter(config-router)# network 172.100.20.0
The set of commands enable RIP version 2, disable route summarization and declares the directly connected sub networks 172.100.10.0 and 172.100.20.0
Configuring EIGRP
OTGRouter(config)# ip routing OTGRouter(config)# router eigrp 100 OTGRouter(config-router)# network 172.100.10.0 OTGRouter(config-router)# network 172.100.20.0 OTGRouter(config-router)# no auto-summary
This enables EIGRP with an AS number 100, disables auto summary and declares directly connected sub networks 172.100.10.0 and 172.100.20.0
View Routing Information
OTGRouter# show ip route
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