上篇博文中我们试验验证了，帧中继point-to-point。今天我们来验证帧中继的point-to-multipoint。
试验拓扑如下：
试验拓扑说明：（拓扑做的有点烂，大家多担待点 。呵呵）
试验拓扑说明：R1的物理接口不添加IP。R1的子接口S0/0.1的ip为192.168.1.1。R2的ip为192.168.1.2。R3的ip为192.168.1.3 。R4的ip为192.168.1.4网络掩码都为255.255.255.0。
R1上S0/0.1的DLCI号为102. 103. 104
R2上S0/0的DLCI号为201
R3上S0/0的DLCI号为301
R4上S0/0的DLCI号为401
试验要求：在路由器间完成帧中继——点到多点的配置。最终使R1分别和R2 R3 R4通讯，而R2 R3 R4之间不能相互通讯。
好了，开始试验吧！
R1
Router>en
Router#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#host r1
r1(config)#int s0/0
r1(config-if)#no ip addr
r1(config-if)#no shut
r1(config-if)#encapsulation frame-relay 在物理接口下封装frame-relay
r1(config-if)#no frame-relay inverse-arp关闭帧中继的反向ARP功能
r1(config-if)#exit
r1(config)#int s0/0.1 multipoint 配置点到多点的frame-relay
r1(config-subif)#ip addr 192.168.1.1 255.255.255.0
r1(config-subif)#no shut
r1(config-subif)#frame-relay map ip 192.168.1.2 102 broadcast映射ip地址
r1(config-subif)#frame-relay map ip 192.168.1.3 103 broadcast与帧中继地
r1(config-subif)#frame-relay map ip 192.168.1.4 104 broadcast址
R2
Router>en
Router#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#host r2
r2(config)#int s0/0
r2(config-if)#ip addr 192.168.1.2 255.255.255.0
r2(config-if)#no shut
r2(config-if)#encapsulation frame-relay在接口下封装frame-relay
r2(config-if)#no frame-relay inverse-arp关闭帧中继的反向ARP功能
r2(config-if)#frame-relay map ip 192.168.1.1 201 broadcast映射ip地址与帧 中继地址
R2 R3 R4的配置是一样的，往下就不再文字解释了。
R3
Router>en
Router#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#host r3
r3(config)#int s0/0
r3(config-if)#ip addr 192.168.1.3 255.255.255.0
r3(config-if)#no shut
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
R4
Router>en
Router#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#host r4
r4(config)#int s0/0
r4(config-if)#ip addr 192.168.1.4 255.255.255.0
r4(config-if)#no shut
r4(config-if)#encapsulation frame-relay
r4(config-if)#no frame-relay inverse-arp
r4(config-if)#frame-relay map ip 192.168.1.1 401 broadcast
验证：
R1分别ping R2 R3 R4 结果表明他们之间能相互通讯
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 = 144/344/568 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 = 216/304/500 ms
r1#ping 192.168.1.4
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.1.4, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 288/373/504 ms
R2 ping R3 R4 结果不能相互通讯
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)
r2#ping 192.168.1.4
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.1.4, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
R3 ping R4不能通讯
r3#ping 192.168.1.4
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.1.4, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
在R1上show int S0/0查看接口信息，
r1#show int s0/0
Serial0/0 is up, line protocol is up
Hardware is M4T
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation FRAME-RELAY, crc 16, loopback not set
Keepalive set (10 sec)
Restart-Delay is 0 secs
LMI enq sent 43, LMI stat recvd 44, LMI upd recvd 0, DTE LMI up
LMI enq recvd 0, LMI stat sent 0, LMI upd sent 0
LMI DLCI 0 LMI type is ANSI Annex D frame relay DTE
FR SVC disabled, LAPF state down
Broadcast queue 0/64, broadcasts sent/dropped 0/0, interface broadcasts 0
Last input 00:00:04, output 00:00:04, output hang never
Last clearing of "show interface" counters 00:07:14
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: weighted fair
Output queue: 0/1000/64/0 (size/max total/threshold/drops)
Conversations 0/1/256 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
Available Bandwidth 1158 kilobits/sec
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
89 packets input, 5416 bytes, 0 no buffer
--More--
在路由器R1 R2 R3 R4上show frame map 查看当前映射项和DLCI映射表的相关信息。
r1#show frame map
Serial0/0.1 (up): ip 192.168.1.2 dlci 102(0x66,0x1860), static,
broadcast,
CISCO, status defined, active
Serial0/0.1 (up): ip 192.168.1.3 dlci 103(0x67,0x1870), static,
broadcast,
CISCO, status defined, active
Serial0/0.1 (up): ip 192.168.1.4 dlci 104(0x68,0x1880), static,
broadcast,
CISCO, status defined, active
r2#show frame map
Serial0/0 (up): ip 192.168.1.1 dlci 201(0xC9,0x3090), static,
broadcast,
CISCO, status defined, active
r3#show frame map
Serial0/0 (up): ip 192.168.1.1 dlci 301(0x12D,0x48D0), static,
broadcast,
CISCO, status defined, active
r4#show frame map
Serial0/0 (up): ip 192.168.1.1 dlci 401(0x191,0x6410), static,
broadcast,
CISCO, status defined, active
验证结束，试验OK。