实验目的：
1、掌握帧中继的基本配置。
2、掌握通过路由器模拟帧中继交换机。
3、理解帧中继的映射表、转发表等。
实验拓扑：
实验步骤：
1、依据图中拓扑，通过路由器模拟帧中继交换机，配置如下：
①开启帧中继交换功能
FW-SW(config)#frame-relay switching
②接口开启帧中继封装，并定义为DCE接口
FW-SW(config)#int s0/0 FW-SW(config-if)#no shutdown FW-SW(config-if)#encapsulation frame-relay [PL2] FW-SW(config-if)#frame-relay intf-type dce FW-SW(config-if)#exit FW-SW(config)#int s0/1 FW-SW(config-if)#no shutdown FW-SW(config-if)#encapsulation frame-relay FW-SW(config-if)#frame-relay intf-type dce FW-SW(config-if)#exit FW-SW(config)#int s0/2 FW-SW(config-if)#no shutdown FW-SW(config-if)#encapsulation frame-relay FW-SW(config-if)#frame-relay intf-type dce FW-SW(config-if)#exit
③编写帧中继转发条目
FW-SW(config)#int s0/0 FW-SW(config-if)#frame-relay route 102 interface s0/1 201 FW-SW(config-if)#frame-relay route 201 interface s0/0 102 FW-SW(config-if)#exit FW-SW(config)#int s0/1 FW-SW(config-if)#frame-relay route 201 interface s0/0 102 FW-SW(config-if)#exit FW-SW(config)#int s0/2 FW-SW(config-if)#frame-relay route 301 interface s0/0 102 FW-SW(config-if)#exit
2、通过部署帧中继技术，使得各个站点可以互相连通，其中R1为中心点，R2和R3为分支点，配置如下：
R1上
R1(config)#int s0/0 R1(config-if)#no shutdown R1(config-if)#encapsulation frame-relay R1(config-if)#no frame-relay inverse-arp R1(config-if)#frame-relay map ip 192.168.1.2 102 broadcast R1(config-if)#frame-relay map ip 192.168.1.3 103 broadcast R1(config-if)#exit
R2上
R2(config)#int s0/0 R2(config-if)#no shutdown R2(config-if)#encapsulation frame-relay R2(config-if)#no frame-relay inverse-arp R2(config-if)#frame-relay map ip 192.168.1.1 201 broadcast R2(config-if)#exit
R3上
R3(config)#int s0/0 R3(config-if)#no shutdown R3(config-if)#encapsulation frame-relay R3(config-if)#no frame-relay inverse-arp R3(config-if)#frame-relay map ip 192.168.1.1 301 broadcast R3(config-if)#exit
3、查看帧中继运行状态，如下：
①查看PVC状态
R1#show frame-relay pvc
PVC Statistics for interface Serial0/0 (Frame Relay DTE)
Active Inactive Deleted Static
Local 2 0 0 0
Switched 0 0 0 0
Unused 0 0 0 0
DLCI = 102, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0/0
input pkts 89 output pkts 47 in bytes 8364
out bytes 6032 dropped pkts 0 in pkts dropped 0
out pkts dropped 0 out bytes dropped 0
in FECN pkts 0 in BECN pkts 0 out FECN pkts 0
out BECN pkts 0 in DE pkts 0 out DE pkts 0
out bcast pkts 47 out bcast bytes 6032
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
pvc create time 00:45:16, last time pvc status changed 00:18:37
DLCI = 103, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0/0
input pkts 0 output pkts 10 in bytes 0
out bytes 1100 dropped pkts 0 in pkts dropped 0
out pkts dropped 0 out bytes dropped 0
in FECN pkts 0 in BECN pkts 0 out FECN pkts 0
out BECN pkts 0 in DE pkts 0 out DE pkts 0
out bcast pkts 10 out bcast bytes 1100
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
pvc create time 00:45:18, last time pvc status changed 00:01:58
PVC状态处于Active状态，说明PVC连接没有问题。
②查看帧中继映射信息，如下：
R1#show frame-relay map
Serial0/0 (up): ip 192.168.1.2 dlci 102(0x66,0x1860), static,
broadcast,
CISCO, status defined, active
Serial0/0 (up): ip 192.168.1.3 dlci 103(0x67,0x1870), static,
broadcast,
CISCO, status defined, active
可以看到，由于关闭IARP并且手工绑定DLCI与IP的映射，所以这里显示Static，并且处于Active状态，说明映射没有问题。
③查看帧中继交换机上的转发表，如下：
FW-SW#show frame-relay route Input Intf Input Dlci Output Intf Output Dlci Status Serial0/0 102 Serial0/1 201 active Serial0/0 103 Serial0/2 301 active Serial0/1 201 Serial0/0 102 active Serial0/2 301 Serial0/0 102 active
4、测试连通性，如下：
R1#ping 192.168.1.2 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 192.168.1.2, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 36/42/60 ms R1#ping 192.168.1.3 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 192.168.1.3, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 16/31/52 ms
以上说明总部和分支和连通性没有问题，测试下分支之间的连通性，如下：
R2#ping 192.168.1.3 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 192.168.1.3, timeout is 2 seconds: ..... Success rate is 0 percent (0/5)
可以看到，分支之间没法相互通信，查看R2和R3的映射表，如下：
R2#show frame-relay map
Serial0/0 (up): ip 192.168.1.1 dlci 201(0xC9,0x3090), static,
broadcast,
CISCO, status defined, active
R3#show frame-relay map
Serial0/0 (up): ip 192.168.1.1 dlci 301(0x12D,0x48D0), static,
broadcast,
CISCO, status defined, active
由于分支之间没有到对方的映射信息，数据没法正常封装，需要加入分支对方的映射，如下：
R2(config)#int s0/0 R2(config-if)#frame-relay map ip 192.168.1.3 201 broadcast R2(config-if)#exit R3(config)#int s0/0 R3(config-if)#frame-relay map ip 192.168.1.2 301 broadcast R3(config-if)#exit
再次查看映射表，如下：
R2#show frame-relay map
Serial0/0 (up): ip 192.168.1.1 dlci 201(0xC9,0x3090), static,
broadcast,
CISCO, status defined, active
Serial0/0 (up): ip 192.168.1.3 dlci 201(0xC9,0x3090), static,
broadcast,
CISCO, status defined, active
R3#show frame-relay map
Serial0/0 (up): ip 192.168.1.1 dlci 301(0x12D,0x48D0), static,
broadcast,
CISCO, status defined, active
Serial0/0 (up): ip 192.168.1.2 dlci 301(0x12D,0x48D0), static,
broadcast,
CISCO, status defined, active
再次测试分支之间的连通性，如下：
R2#ping 192.168.1.3 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 192.168.1.3, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 44/68/96 ms
当加入映射后，分支正常通信！注意，星形拓扑中分支之间的数据需要经过中心点进行转发。此实验完成。
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