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Lab 5: Configuring a Frame Relay Switch ”Part IILab WalkthroughThe Frame Relay switch in this lab functions as a fully meshed Frame Relay service. A fully meshed Frame Relay service has a PVC not only to a central site, but also to every other site. This can lead to several scaling problems when a large number of sites are involved. Some Layer 3 routing issues, such as split horizons, also can occur on a multipoint network. Chapter 5 discusses this in more depth. To configure Frame Relay switching, you need to perform the following tasks :
First, enable Frame Relay switching using the frame-relay switching global command from configuration mode. Second, configure the serial interfaces for Frame Relay switching, as shown in Figure 1-17. To perform this, use the encapsulation frame-relay command, along with the commands frame-relay intf-type dce command and frame-relay lmi-type ansi on serial Interface 5. Example 1-53 highlights the Frame Relay switch configuration. Example 1-53 Frame Relay Multipoint Configurationhostname frame_switch ! frame-relay switching -Enables Frame Relay switching ! interface Ethernet0 no ip address shutdown ! interface Serial0 no ip address encapsulation frame-relay Sets Frame encapsulation clockrate 56000 Sets the clockrate, needed for DCE interface frame-relay intf-type dce Sets Frame Relay to a DCE interface frame-relay route 21 interface Serial1 112 Creates and maps DLCI 21 to DLCI 112 on Serial 1 frame-relay route 23 interface Serial5 32 Creates and maps DLCI 23 to DLCI 32 on Serial 5 ! interface Serial1 no ip address encapsulation frame-relay clockrate 56000 frame-relay intf-type dce frame-relay route 112 interface Serial0 21 Creates and maps DLCI 112 to DLCI 21 on Serial 0 frame-relay route 113 interface Serial5 31 Creates and maps DLCI 113 to DLCI 31 on Serial 5 ! <<<text omitted>>> ! interface Serial5 no ip address encapsulation frame-relay clockrate 56000 frame-relay lmi-type ansi Sets the LMI type to ANSI versus Cisco frame-relay intf-type dce frame-relay route 31 interface Serial1 113 Creates and maps DLCI 31 to DLCI 113 on Serial 1 frame-relay route 32 interface Serial0 23 Creates and maps DLCI 32 to DLCI 23 on Serial 0 ! <<<text omitted>>> end To see if your Frame Relay switch is working, you need to configure the DTE, or router side of the network. When this is complete, the PVCs will become "active." Example 1-54 illustrates the Frame Relay configuration of R1, R2, and R3. Example 1-54 The Significant Configuration Portions of R1, R2, and R3hostname r1 ! interface Serial0 ip address 172.16.17.1 255.255.255.0 encapsulation frame-relay frame-relay map ip 172.16.17.2 112 broadcast frame-relay map ip 172.16.17.3 113 broadcast ! __________________________________________________________ hostname r2 ! interface Serial0 ip address 172.16.17.2 255.255.255.0 no ip directed-broadcast encapsulation frame-relay no ip mroute-cache frame-relay map ip 172.16.17.1 21 broadcast frame-relay map ip 172.16.17.3 23 broadcast ! __________________________________________________________ hostname r3 ! interface Serial0 ip address 172.16.17.3 255.255.255.0 no ip directed-broadcast encapsulation frame-relay no ip mroute-cache frame-relay map ip 172.16.17.1 31 broadcast frame-relay map ip 172.16.17.2 32 broadcast frame-relay lmi-type ansi ! When this is complete, enter the show frame-relay route command to ensure that all connections are up and active. Also verify that LMI is correctly configured with the show frame-relay lmi command. These two commands manifest themselves in Example 1-55. Example 1-55 The show frame-relay route and show frame-relay lmi Commandsframe_switch# show frame-relay route Input Intf Input Dlci Output Intf Output Dlci Status Serial0 21 Serial1 112 active Serial0 23 Serial5 32 active Serial1 112 Serial0 21 active Serial1 113 Serial5 31 active Serial5 31 Serial1 113 active Serial5 32 Serial0 23 active frame_switch# frame_switch# show frame-relay lmi LMI Statistics for interface Serial0 (Frame Relay DCE) LMI TYPE = CISCO Invalid Unnumbered info 0 Invalid Prot Disc 0 Invalid dummy Call Ref 0 Invalid Msg Type 0 Invalid Status Message 0 Invalid Lock Shift 0 Invalid Information ID 0 Invalid Report IE Len 0 Invalid Report Request 0 Invalid Keep IE Len 0 Num Status Enq. Rcvd 188 Num Status msgs Sent 188 Num Update Status Sent 0 Num St Enq. Timeouts 0 LMI Statistics for interface Serial1 (Frame Relay DCE) LMI TYPE = CISCO Invalid Unnumbered info 0 Invalid Prot Disc 0 Invalid dummy Call Ref 0 Invalid Msg Type 0 Invalid Status Message 0 Invalid Lock Shift 0 Invalid Information ID 0 Invalid Report IE Len 0 Invalid Report Request 0 Invalid Keep IE Len 0 Num Status Enq. Rcvd 188 Num Status msgs Sent 188 Num Update Status Sent 0 Num St Enq. Timeouts 0 LMI Statistics for interface Serial5 (Frame Relay DCE) LMI TYPE = ANSI Invalid Unnumbered info 0 Invalid Prot Disc 0 Invalid dummy Call Ref 0 Invalid Msg Type 0 Invalid Status Message 0 Invalid Lock Shift 0 Invalid Information ID 0 Invalid Report IE Len 0 Invalid Report Request 0 Invalid Keep IE Len 0 Num Status Enq. Rcvd 185 Num Status msgs Sent 185 Num Update Status Sent 0 Num St Enq. Timeouts 1 frame_switch# |
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