Cisco IOS Wide-Area Networking Configuration Guide - Free Books

Frame Relay Configuration ExamplesConfiguring Frame Relayframe-relay map IP 131.108.126.2 100 broadcastThe frame-relay map command is used to map an IP address into a DLCI address. To boot over FrameRelay, you must explicitly give the address of the network server to boot from, and a frame-relay mapentry must exist for that site. For example, if file “gs3-bfx.83-2.0” is to be booted from a host with IPaddress 131.108.126.111, the following commands must be in the configuration:boot system gs3-bfx.83-2.0 131.108.13.111!interface Serial 1ip address 131.108.126.200 255.255.255.0encapsulation frame-relayframe-relay map ip 131.108.126.111 100 broadcastIn this case, 100 is the DLCI that can get to host 131.108.126.111.The remote router must be configured with the following command:frame-relay map ip 131.108.126.200 101 broadcastThis entry allows the remote router to return a boot image (from the network server) to the router bootingover Frame Relay. Here, 101 is a DLCI of the router being booted.Frame Relay Switching ExamplesThe following sections provide examples of configuring one or more routers as Frame Relay switches:• PVC Switching Configuration Example• Pure Frame Relay DCE Example• Hybrid DTE/DCE PVC Switching Example• Switching over an IP Tunnel Example• Frame Relay Switching over ISDN B Channels Example• Traffic Shaping on Switched PVCs Example• Traffic Policing on a UNI DCE Example• Congestion Management on Switched PVCs Example• Congestion Management on the Traffic-Shaping Queue of a Switched PVC Example• FRF.12 Fragmentation on a Switched PVC Configuration ExamplePVC Switching Configuration ExampleYou can configure your router as a dedicated, DCE-only Frame Relay switch. Switching is based onDLCIs. The incoming DLCI is examined, and the outgoing interface and DLCI are determined.Switching takes place when the incoming DLCI in the packet is replaced by the outgoing DLCI, and thepacket is sent out the outgoing interface.In Figure 31, the router switches two PVCs between serial interfaces 1 and 2. Frames with DLCI 100received on serial 1 will be transmitted with DLCI 200 on serial 2.60