Performing a Basic Configuration
Performing a Basic Configuration
Following are instructions for a basic interface configuration: enabling an interface, specifying IP routing, and setting up external timing on a DCE interface. You might also need to enter other configuration subcommands, depending on the requirements for your system configuration and the protocols you plan to route on the interface. For complete descriptions of configuration subcommands and the configuration options available for serial interfaces, refer to the appropriate software documentation.
In the following procedure, press the Return key after each step unless otherwise noted. At any time you can exit the privileged level and return to the user level by entering disable at the prompt as follows:
Router# disable
Router>
Step 1 At the
Router# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#
Step 2 For a Cisco 7200 series, Cisco uBR7200 series or a Cisco 7100 series router, specify the first interface to configure by entering the subcommand interface, followed by the type (serial) and slot/interface (port adapter slot number and interface number). The example that follows is for the first interface of the port adapter on a Cisco 7200 series, Cisco 7100 series, or Cisco uBR7200 series router in slot 1:
Router(config)# interface serial 1/0
For a VIP2, specify the first interface to configure by entering the subcommand interface, followed by the type (serial) and slot/port (interface processor slot number/0). The example that follows is for the first interface of the first port adapter on a VIP2 in interface processor slot 3:
Router(config)# interface serial 3/0
Step 3 If IP routing is enabled on the system, you can assign an IP address and subnet mask to the interface with the ip address configuration subcommand, as in the following example:
Step 4 Add any additional configuration subcommands required to enable routing protocols and set the interface characteristics.
Step 5 If you are configuring a DTE interface, proceed to Step 7. If you are configuring a DCE interface, you need to configure the external clock signal, as described in the next step.
Step 6 Set the clock rate with the clock rate command. (See the next section, “Configuring Timing (Clock) Signals.”)
Step 7 Change the shutdown state to up and enable the interface as follows: