Cisco IOS Wide-Area Networking Configuration Guide - Free Books

Configuring Frame Relay SwitchingConfiguring Frame Relayreassemble those packets before sending them to a Frame Relay access device that does not supportFRF.12. If the receiving Frame Relay access device does support FRF.12, the router will transmit thefragmented packets without reassembling them.Note the following conditions and restrictions on FRF.12 fragmentation on switched PVCs:• Frame Relay traffic shaping must be enabled.• Interface queueing must be dual FIFO queueing or PVC interface priority queueing.• Switched PVCs must be configured using the connect command.• If the Frame Relay access device does not support FRF.12 fragmentation, the FRF.12 Support onSwitched Frame Relay PVCs feature will not benefit the interface between the Frame Relay accessdevice and the edge router. Fragmentation and reassembly occur on the interface between the edgerouter and the switched Frame Relay network.• If the Frame Relay access device is sending voice and unfragmented data on the same PVC, voicequality will suffer. The edge router will not reorder packets on switched PVCs.To configure FRF.12 on switched PVCs, use the following map-class configuration command:CommandRouter(config-map-class)# frame-relay fragment fragment_sizeswitchedPurposeEnables FRF.12 fragmentation on switched FrameRelay PVCs for a Frame Relay map class.The map class can be associated with one or more switched PVCs.Verifying Frame Relay SwitchingTo verify the correct configuration of Frame Relay switching, use one or more of the followingcommands:CommandRouter# show frame-relay fragment [interface interface] [dlci]Router# show frame-relay pvc [interface interface] [dlci]Router# show interfaces [type number]PurposeDisplays statistics about Frame Relayfragmentation.Displays statistics about Frame Relay PVCsincluding detailed reasons for packet drops onswitched PVCs and complete status informationfor switched NNI PVCs.Displays information about the configuration andqueue at the interface.26