4-2
PA-E3 Serial Port Adapter Installation and Configuration
OL-3502-04
Chapter 4 Configuring the PA-E3
Configuring the Interfaces
Configuring the Interfaces
After you verify that the new PA-E3 is installed correctly (the enabled LED goes on), use the
privileged-level configure command to configure the new interfaces. Have the following information
available:
•
Protocols you plan to route on each new interface
•
IP addresses, if you plan to configure the interfaces for IP routing
•
Bridging protocols you plan to use
•
Clock timing source you plan to use for each new interface and clock speeds for external timing.
If you installed a new PA-E3 or if you want to change the configuration of an existing interface, you must
enter configuration mode to configure the new interfaces. If you replaced a PA-E3 that was previously
configured, the system recognizes the new interfaces and brings each of them up in their existing
configurations.
For a summary of the configuration options available and instructions for configuring interfaces on a
PA-E3, refer to the appropriate configuration publications listed in the
“Related Documentation” section
.
You execute configuration commands from the privileged level of the EXEC command interpreter, which
usually requires password access. Contact your system administrator, if necessary, to obtain password
access. (See the
“Using the EXEC Command Interpreter” section on page 4-1
for an explanation of the
privileged level of the EXEC.)
This section contains the following subsections:
•
Shutting Down an Interface, page 4-2
•
Performing a Basic Interface Configuration, page 4-8
•
Configuring Cyclic Redundancy Checks, page 4-10
Shutting Down an Interface
Before you remove an interface that you will not replace, replace a compact coaxial cable, or replace
port adapters, use the shutdown command to shut down (disable) the interfaces to prevent anomalies
when you reinstall the new or reconfigured interface processor. When you shut down an interface, it is
designated administratively down in the show command displays.
Follow these steps to shut down an interface:
Step 1
Enter the privileged level of the EXEC command interpreter (also called enable mode). (See the
the EXEC Command Interpreter” section on page 4-1
for instructions.)
Step 2
At the privileged-level prompt, enter configuration mode and specify that the console terminal is the
source of the configuration subcommands, as follows:
Router#
configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#
Step 3
Shut down interfaces by entering the interface serial subcommand (followed by the interface address of
the interface), and then enter the shutdown command.
When you have finished, press Ctrl-Z—hold down the Control key while you press Z—or enter end or
exit to exit configuration mode and return to the EXEC command interpreter.
