分类: 系统运维
2009-06-29 20:52:24
实验目的:
1、掌握EIGRP与IS-IS的重发布配置。
实验拓扑图:
实验步骤及要求:
1、配置各台路由器的IP地址,并且使用Ping命令确认各路由器的直连口的互通性。
2、配置R1与R2的IS-IS路由协议和R2与R3的EIGRP路由协议。
3、查看R1、R2和R3的路由表:
R1#show ip route Gateway of last resort is not set 172.16.0.0/16 is variably subnetted, 3 subnets, 2 masks C 172.16.255.0/30 is directly connected, Serial1/1 C 172.16.1.0/24 is directly connected, Loopback0 C 172.16.2.0/24 is directly connected, Loopback1 R1# |
R2#show ip route Gateway of last resort is not set 172.16.0.0/16 is variably subnetted, 3 subnets, 2 masks C 172.16.255.0/30 is directly connected, Serial1/0 i L1 172.16.1.0/24 [115/20] via 172.16.255.1, Serial1/0 i L1 172.16.2.0/24 [115/20] via 172.16.255.1, Serial1/0 192.168.255.0/30 is subnetted, 1 subnets C 192.168.255.0 is directly connected, Serial1/1 D 192.168.1.0/24 [90/2297856] via 192.168.255.1, 00:00:04, Serial1/1 D 192.168.2.0/24 [90/2297856] via 192.168.255.1, 00:00:04, Serial1/1 R2# |
R3#show ip route Gateway of last resort is not set C 192.168.255.0/24 is directly connected, Serial1/0 C 192.168.1.0/24 is directly connected, Loopback0 C 192.168.2.0/24 is directly connected, Loopback1 R3# *Mar 29 10:39:29.171: %SYS-5-CONFIG_I: Configured from console by console R3# |
4、根据show ip route命令可以看出,只有R2路由才可以学习到整个网络的完整路由。是因为,R2路由处于EIGRP与IS-IS网络的边界。其同时运行了两种不同的路由协议。
5、为了确保R1和R2能够学习到整个网络路由。在R2上配置路由重发布。配置如下:
R2(config)#router isis cisco R2(config-router)#redistribute eigrp 100 metric 20 level-2 R2(config-router)#exit R2(config)# R2(config)#router eigrp 100 R2(config)#redistribute isis cisco level-1-2 metric 100000 10 255 1 1500 R2(config)# |
因为EIGRP采用的是复合型的度量值,所以在重发布时,需要根据网络的实际情况指定相应的度量值。
6、查看R1路由器和R3路由器的路由表:
R1#show ip route Gateway of last resort is not set 172.16.0.0/16 is variably subnetted, 3 subnets, 2 masks C 172.16.255.0/30 is directly connected, Serial1/1 C 172.16.1.0/24 is directly connected, Loopback0 C 172.16.2.0/24 is directly connected, Loopback1 192.168.255.0/30 is subnetted, 1 subnets i L2 192.168.255.0 [115/30] via 172.16.255.2, Serial1/1 i L2 192.168.1.0/24 [115/30] via 172.16.255.2, Serial1/1 i L2 192.168.2.0/24 [115/30] via 172.16.255.2, Serial1/1 R1# |
R3#show ip route Gateway of last resort is not set 172.16.0.0/24 is subnetted, 2 subnets D EX 172.16.1.0 [170/2172416] via 192.168.255.2, 00:08:48, Serial1/0 D EX 172.16.2.0 [170/2172416] via 192.168.255.2, 00:08:48, Serial1/0 C 192.168.255.0/24 is directly connected, Serial1/0 C 192.168.1.0/24 is directly connected, Loopback0 C 192.168.2.0/24 is directly connected, Loopback1 R3# |
7、确认路由有效性:
R3#ping 172.16.1.1 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 172.16.1.1, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 88/94/96 ms R3# |
R1#ping 192.168.1.1 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 192.168.1.1, timeout is 2 seconds: ..... Success rate is 0 percent (0/5) R1# |
8、再次查看R3的路由表:
R3#show ip route Gateway of last resort is not set 172.16.0.0/24 is subnetted, 2 subnets D EX 172.16.1.0 [170/2172416] via 192.168.255.2, 00:23:06, Serial1/0 D EX 172.16.2.0 [170/2172416] via 192.168.255.2, 00:23:06, Serial1/0 C 192.168.255.0/24 is directly connected, Serial1/0 C 192.168.1.0/24 is directly connected, Loopback0 C 192.168.2.0/24 is directly connected, Loopbac R3# |
查看路由发现缺少172.16.255.0/24网络路由。产生此问题的原因是:IS-IS在重发布时,不会将直连网段重发布。
9、在R2上EIGRP协议中添加配置重发布直连网络:
R2(config)#router eigrp 100 R2(config-router)#redistribute connected metric 100000 10 255 1 1500 R2(config-router)#exit |
10、查看R3路由表:
R3#show ip route Gateway of last resort is not set 172.16.0.0/16 is variably subnetted, 3 subnets, 2 masks D EX 172.16.255.0/30 [170/2172416] via 192.168.255.2, 00:00:06, Serial1/0 D EX 172.16.1.0/24 [170/2172416] via 192.168.255.2, 00:26:56, Serial1/0 D EX 172.16.2.0/24 [170/2172416] via 192.168.255.2, 00:26:56, Serial1/0 C 192.168.255.0/24 is directly connected, Serial1/0 C 192.168.1.0/24 is directly connected, Loopback0 C 192.168.2.0/24 is directly connected, Loopback1 R3# |
11、在R3上确认路由有效性:
R1#ping 192.168.1.1 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 192.168.1.1, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 120/148/168 ms R1# |
12、实验完成。