CCNA配置试验之九 帧中继――点到多点（point-to-multipoint）子接口配置

版权声明：原创作品，允许转载，转载时请务必以超链接形式标明文章 原始出处 、作者信息和本声明。否则将追究法律责任。 http://fanlinlin.blog.51cto.com/535085/134369

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。   本文出自 “ 范琳琳学习笔记” 博客，请务必保留此出处 http://fanlinlin.blog.51cto.com/535085/134369 本文出自 51CTO.COM技术博客