Configuring a Cisco Router as a Frame Relay
Switch
To configure Frame Relay switching, you must perform the
following tasks:
- Step 1. Enable Frame Relay switching.
You do this with the
global configuration command frame-relay
switching.
- Step 2. Configure the interface LMI and the Frame Relay interface
type.
You need to set the encapsulation to Frame Relay with the encapsulation frame-relay command, and you must set
the LMI type with the frame-relay lmi-type
[ansi | cisco
| q993a] command from the interface prompt. To
continue configuring the Frame Relay interface, add the frame-relay intf-type dce command. Because the
interface is DCE, you also need to use the clock
rate bps command. The bps values range from 1200 to 8000000.
- Step 3. Configure PVCs with the frame-relay
route command.
You do this with the interface command frame-relay route [16-1007] inbound_DLCI
interface outbound_serial_interface [16-1007] outbound_DLCI.
This command creates a PVC on the interface and maps it to another
interface.
Figure 2-3 shows the
diagram used in this example. It highlights the network from a hardware and
service provider perspective. The Frame Relay switch has two V.35 DCE cables to
two routers, R1 and R2. These two routers have V.35 DTE male cables connected to
their Serial 0 ports. You configure a PVC with DLCI 110 on Serial 0 mapping to
DLCI 120 on Serial 1. Other types of cables, such as X.21 or RS232, can be used
as well. Cisco also makes back-to-back cable, which can save you a lot of space
when you build a lab at home.
Example 2-3
demonstrates the use of these commands and the basic configuration of a Frame
Relay switch.
Sections
Archive
Newsletter
Comments (0 posted)
Syndication
