Using the Exec Command Interpreter

You modify the conﬁguration of your router through the software command interpreter called the EXEC (also called enable mode). You must enter the privileged level of the EXEC command interpreter with the enable command before you can use the conﬁgure command to conﬁgure a new interface or change the existing conﬁguration of an interface. The system prompts you for a password if one is set.

The system prompt for the privileged level ends with a pound sign (#) instead of an angle bracket

(>). At the console terminal, use the following procedure to enter the privileged level:

Step 1 At the user-level EXEC prompt, enter the enable command. The EXEC prompts you for a privileged-level password as follows:

Router> enable

Password:

Step 2 Enter the password (the password is case-sensitive). For security purposes, the password is not displayed.

When you enter the correct password, the system displays the privileged-level system prompt (#):

Router#

Proceed to the following sections to conﬁgure the new interfaces.

Identifying Port Adapter Slot and T3 Interface Port Numbers

This section describes how to identify port adapter slot and PA-T3 interface port numbers for the Cisco 7200 series routers, the Cisco uBR7200 series routers, the VIP2, and the Catalyst RSM/VIP2.

Cisco 7200 Series and Cisco uBR7200 Series Ports

Physical port addresses specify the actual physical location of each interface port on a Cisco 7200 series router (see Figure 8-1) or a Cisco uBR7200 series router (see Figure 8-2). This address is composed of a two-part number in the format port adapter slot number/interface port number, as follows:

•The ﬁrst number identiﬁes the chassis slot in which the PA-T3 serial port adapter is installed.

•The second number identiﬁes the interface port on each PA-T3 serial port adapter; the interface port is always numbered as interface 0 for the one-port PA-T3 serial port adapter and 0 or 1 for a two-port PA-2T3 serial port adapter.

Interface ports maintain the same address regardless of whether other port adapters are installed or removed from the slot. However, when you move a port adapter to a different slot, the ﬁrst number in the address changes to reﬂect the new chassis slot number.

In Cisco 7200 series routers, port adapter slots are numbered from the lower left to the upper right, beginning with port adapter slot 1 and continuing through port adapter slot 2 for the Cisco 7202, slot 4 for the Cisco 7204 and Cisco 7204VXR, and slot 6 for the Cisco 7206 and Cisco 7206VXR. Port adapter slot 0 is reserved for the optional Fast Ethernet port on the I/O controller—if present. Figure 8-1 shows the port adapter slots and interface ports of a Cisco 7206. The individual interface port numbers always begin with 0. The number of additional ports depends on the number of ports on a port adapter.

8-2PA-T3 Serial Port Adapter Installation and Configuration