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Lecture LAN Extension into a WAN: Establishing a WAN Connection with Frame Relay

After studying this chapter you will be able to: Describe the fundamental concepts of Frame Relay technology in terms of Enterprise WAN services including Frame Relay operation, Frame Relay implementation requirements, Frame Relay maps, and LMI operation; configure a basic Frame Relay PVC including configuring and troubleshooting Frame Relay on a router serial interface and configuring a static Frame Relay map. | LAN Extension into a WAN Establishing a WAN Connection with Frame Relay Frame Relay Overview Connections made by virtual circuits Connection-oriented service Purpose: This figure provides a big-picture definition of Frame Relay. Emphasize: Frame Relay is used between the CPE device and the Frame Relay switch. It does NOT affect how packets get routed within the Frame Relay cloud. Frame Relay is a purely Layer 2 protocol. The network providing the Frame Relay service can be either a carrier-provided public network or a network of privately owned equipment serving a single enterprise. Make a clear distinction between DCE, DTE, and CPE. Emphasize that Frame Relay over SVCs is not discussed in this chapter because it is not widely supported by service providers at this time. The service provider must also support SVCs in order for Frame Relay over SVCs to operate. Note: In Cisco IOS Release 11.2, two traffic shaping features were introduced: Generic (adaptive) traffic shaping Frame Relay | LAN Extension into a WAN Establishing a WAN Connection with Frame Relay Frame Relay Overview Connections made by virtual circuits Connection-oriented service Purpose: This figure provides a big-picture definition of Frame Relay. Emphasize: Frame Relay is used between the CPE device and the Frame Relay switch. It does NOT affect how packets get routed within the Frame Relay cloud. Frame Relay is a purely Layer 2 protocol. The network providing the Frame Relay service can be either a carrier-provided public network or a network of privately owned equipment serving a single enterprise. Make a clear distinction between DCE, DTE, and CPE. Emphasize that Frame Relay over SVCs is not discussed in this chapter because it is not widely supported by service providers at this time. The service provider must also support SVCs in order for Frame Relay over SVCs to operate. Note: In Cisco IOS Release 11.2, two traffic shaping features were introduced: Generic (adaptive) traffic shaping Frame Relay traffic shaping Both of these features can be used to adjust the rate at which traffic is sent by the router. In addition, these features allow the router to throttle the traffic rate based on BECNs received from the Frame Relay switch. Neither of these features are discussed in this course. Frame Relay traffic shaping is discussed in the Building Cisco Remote Access Networks (BCRAN) course. Information on both can be found in Cisco documentation. Frame Relay Terminology Purpose: This figure provides an overview of terminology so that the student is prepared to understand the Frame Relay operation discussion. The terminology used with Frame Relay varies by service provider. These are the commonly used terms. Point out the local access loop and note that the local access rate is different than the rate used within the Frame Relay cloud. The DLCI is of local significance, therefore, point out that the same DLCI can be used in multiple places in the network. The autosensing LMI is a .