在一些特殊情况下，三个路由器组成一个简单的拓扑，分处不同的网段，除了使用DDN之外，还可以通过配置帧中继的方法，实现不同网段之间的数据通信。这是今天要进行的实验的目的，下面以公司内网和外网的实例来说明。
公司总部和分支机构的通信除了用DDN之外，另外还可以采用帧中继。路由器A是总公司，B和C是分支机构，利用帧中继通信的具体配置可以如下：
试验环境：
首先要清楚全网示意图：
A：连接帧中继的端口：202.110.100.1 255.255.255.0
局域网端口192.168.10.1 255.255.255.0
B：连接帧中继的端口：202.110.100.2 255.255.255.0
局域网端口192.168.10.2 255.255.255.0
C：连接帧中继的端口：202.110.100.3 255.255.255.0
局域网端口192.168.10.3 255.255.255.0
通过对帧中继的配置，实现不同网段间的通信，那么试验就成功了。
在A上做：
router>en Router#config t Enter configuration commands, one per line. End with CNTL/Z. Router(config)#host A A(config)#int e0 A(config-if)#ip addr 192.168.10.1 255.255.255.0 A(config-if)#no shut %LINK-3-UPDOWN: Interface Ethernet0, changed state to up A(config-if)#int s0 A(config-if)#ip addr 202.110.100.1 255.255.255.0 A(config-if)#encap frame-relay A(config-if)#frame-relay int A(config-if)#frame-relay int A(config-if)#frame-relay interface-dlci 102 A(config-if)#frame-relay interface-dlci 103 A(config-if)#bandwidth 64 A(config-if)#no shut %LINK-3-UPDOWN: Interface Serial0, changed state to up A(config-if)#exit %LINK-3-UPDOWN: Interface Serial0, changed state to down %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0, changed state to down 21:49:39: %FR-5-DLCICHANGE: Interface Serial0 http://www.luyouqiwang.com/14163/ A(config)#router eigrp 100 A(config-router)#net 202.110.100.0 A(config-router)#net 192.168.10.0 A(config-router)#exit %LINK-3-UPDOWN: Interface Serial0, changed state to up %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0, changed state to up A(config)#^Z %SYS-5-CONFIG_I: Configured from console by console 再B上做： Router>en Router#config t Enter configuration commands, one per line. End with CNTL/Z. Router(config)#host B B(config)#int e0 B(config-if)#ip addr 192.168.20.1 255.255.255.0 B(config-if)#no shut %LINK-3-UPDOWN: Interface Ethernet0, changed state to up B(config-if)#int s0 B(config-if)#ip addr 202.110.100.2 255.255.255.0 B(config-if)#encap frame-relay B(config-if)#frame-relay interface-dlci 201 B(config-if)#frame-relay interface-dlci 203 B(config-if)#bandwidth 64 B(config-if)#no shut %LINK-3-UPDOWN: Interface Serial0, changed state to up B(config-if)#exit B(config)#router eigrp 100 B(config-router)#net 192.168.20.0 B(config-router)#net 202.110.100.0 B(config-router)#exit B(config)#^Z %SYS-5-CONFIG_I: Configured from console by console 在C上做： Router> Router>en Router#config t Enter configuration commands, one per line. End with CNTL/Z. Router(config)#host C C(config)#int e0 C(config-if)#ip addr 192.168.30.1 255.255.255.0 C(config-if)#no shut %LINK-3-UPDOWN: Interface Ethernet0, changed state to up C(config-if)#int s0 C(config-if)#ip addr 202.110.100.3 255.255.255.0 C(config-if)#encap frame-relay C(config-if)#frame-relay int C(config-if)#frame-relay interface-dlci 301 C(config-if)#frame-relay interface-dlci 302 C(config-if)#bandwidth 64 C(config-if)#no shut %LINK-3-UPDOWN: Interface Serial0, changed state to up C(config-if)#exit C(config)#router eigrp 100 C(config-router)#net 202.110.100.0 C(config-router)#net 192.168.30.0 C(config-router)#exit C(config)#exit 在A上测试路由： A# A#show ip ro Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default U - per-user static route Gateway of last resort is not set C 192.168.10.0 is directly connected, Ethernet0 C 202.110.100.0 is directly connected, Serial0 D 192.168.20.0 [90/3061760] via 202.110.100.2, 00:03:43, Serial0 D 192.168.30.0 [90/3061760] via 202.110.100.3, 00:00:28, Serial0 在B上测试路由： B# B#show ip ro Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default U - per-user static route Gateway of last resort is not set C 192.168.20.0 is directly connected, Ethernet0 C 202.110.100.0 is directly connected, Serial0 D 192.168.10.0 [90/3061760] via 202.110.100.1, 00:02:27, Serial0 D 192.168.30.0 [90/3061760] via 202.110.100.3, 00:00:17, Serial0 在C上测试路由： C# C# C#show ip ro Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default U - per-user static route Gateway of last resort is not set C 192.168.30.0 is directly connected, Ethernet0 C 202.110.100.0 is directly connected, Serial0 D 192.168.10.0 [90/3061760] via 202.110.100.1, 00:11:44, Serial0 D 192.168.20.0 [90/3061760] via 202.110.100.2, 00:11:44, Serial0 互通情况测试： C#ping 192.168.30.1 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 192.168.30.1, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms C#ping 192.168.20.1 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 192.168.20.1, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms C#ping 192.168.10.1 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 192.168.10.1, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms C#ping 202.110.100.1 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 202.110.100.1, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms C#ping 202.110.100.2 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 202.110.100.2, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms C#ping 202.110.100.3 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 202.110.100.3, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms 总结，已经就是不使用DDN而采用配置帧中继来实现不同网段的互联互通的全部配置命令。大家可以举一反三的利用这些知识来操作不同情况下的组网。 |
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