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6.2 | |
Configuring Frame Relay | |
| 6.2.1 | |
Configuring Frame Relay encapsulation |
Frame Relay encapsulation must be
specified when an interface is configured for Frame Relay. The two
possible Frame Relay encapsulations are
ietf
and cisco.
Cisco
is the default encapsulation.
 The
cisco
method is proprietary and should not be used if the router is
connected to another vendor's equipment across a Frame Relay network.To configure basic Frame Relay using Inverse ARP and LMI autosensing, all that is needed is to configure the Layer 3 IP address on the interface and set the encapsulation to Frame Relay.
If using Cisco IOS Release 11.1 or
earlier, the LMI type will need to be specified using the following
command:
It is important to remember that the Frame Relay service provider maps the virtual circuit within the Frame Relay network connecting the two remote customer premises equipment (CPE) devices that are typically routers. Once the CPE device, or router, and the Frame Relay switch are exchanging LMI information, the Frame Relay network has everything it needs to create the virtual circuit with the other remote router. The Frame Relay network is not like the Internet where any two devices connected to the Internet can communicate. In a Frame Relay network, before two routers can exchange information, a virtual circuit between them must be set up ahead of time by the Frame Relay service provider.
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