Frame Relay Theory

Encapsulation

Cisco IOS software supports two types of Frame Relay encapsulation: the default Cisco encapsulation and the standards-based IETF encapsulation.

Commands

frame-relay map

To define the mapping between a destination protocol address and the data-link connection identifier (DLCI) or Frame Relay permanent virtual circuit (PVC) bundle that connects to the destination address, use the frame-relay map command in interface configuration mode. To delete the map entry, use the no form of this command.

The broadcast keyword provides two functions: it forwards broadcasts when multicasting is not enabled, and it simplifies the configuration of OSPF for nonbroadcast networks that will use Frame Relay.

The broadcast keyword may also be required for some routing protocols—for example, AppleTalk—that depend on regular routing table updates, especially when the router at the remote end is waiting for a routing update packet to arrive before adding the route.

Example.  Router(config-if)# frame relay map ip 10.1.1.2 102 broadcast.

Where 10.1.1.2 is the ip address of the router i want to reach and 102 is my local dlci circuit.