While in the interface mode your prompt should look like this:RouterName(config-if)#
Then type the command:
RouterName(config-if)# no shutdown
In the interface configuration mode of a router, the command ip address dhcp enables the interface to acquire an IPv4 address automatically from an ISP via DHCP when the link to the ISP is enabled. This command instructs the router to request an IP address and other configuration information from a DHCP server. After issuing this command, ensure that the interface is also enabled with the no shutdown command.
To prevent RIP updates from being sent from router B and C to router A, you can use the command passive-interface on router B for the interface connected to router A. This command will stop RIP updates from being sent out that specific interface while still allowing updates to be received. Additionally, ensure that RIP updates are not configured on the interface connecting B and C if you want to restrict routing updates further.
When the interface is functioning as a DCE device
Showi ip route
The interface is configured as a DCE device.
Cisco IOS uses a command line interface (CLI) for inputting commands when configuring Cisco Routers
Cisco IOS uses a command line interface (CLI) for inputting commands when configuring Cisco Routers
On a Cisco router, that means that you entered interface configuration mode; any command you give will affect the selected interface. For example, you may have given the commands:Router>enableRouter#configure terminalRouter(config)#interface FastEthernet 1/0Router(config-if)#On a Cisco router, that means that you entered interface configuration mode; any command you give will affect the selected interface. For example, you may have given the commands:Router>enableRouter#configure terminalRouter(config)#interface FastEthernet 1/0Router(config-if)#On a Cisco router, that means that you entered interface configuration mode; any command you give will affect the selected interface. For example, you may have given the commands:Router>enableRouter#configure terminalRouter(config)#interface FastEthernet 1/0Router(config-if)#On a Cisco router, that means that you entered interface configuration mode; any command you give will affect the selected interface. For example, you may have given the commands:Router>enableRouter#configure terminalRouter(config)#interface FastEthernet 1/0Router(config-if)#
By configuring an IPv6 Unicast routing command on a router you are allowing the router to communicate with the IPv6 interface. This is needed if you intend to send or receive data over an IPv6 network.
Platform Holdtime Local Interface
Router(config-if)# no shutdown
show interface