CCNP路由重分发（四）EIGRP-to-ISIS
本文共 4448 字，大约阅读时间需要 14 分钟。
这个实验是关于EIGRP和ISIS网络之间的路由重分发。ISIS也属于链路状态路由，采用的也是分层结构，但与OSPF不同的是ISIS每一个路由器只能属于一个区域，而OSPF则可以将同一个路由器上的不同接口分配到不同的区域中。 
先看一下实验的拓扑图吧，这个图有点没画好，配置ISIS的路由器只能属于一个区域，希望大家不要被小圆圈误导 
实验用的时小凡的模拟器，路由器连接拓扑如下表：
Router1 S0/0 <----> Router2 S0/1 Router2 S0/0 <----> Router3 S0/1 Router3 S0/0 <----> Router4 S0/1
未配置路由重分发前个路由器路由表的状况： R1#sh ip route ！ Gateway of last resort is not set
10.0.0.0/8 is variably subnetted, 5 subnets, 2 masks D 10.0.0.8/30 [90/2681856] via 10.0.0.2, 00:27:40, Serial0/0 C 10.2.0.0/16 is directly connected, Loopback1 C 10.3.0.0/16 is directly connected, Loopback2 C 10.0.0.0/30 is directly connected, Serial0/0 C 10.1.0.0/16 is directly connected, Loopback0
R2#sh ip route ！ Gateway of last resort is not set
10.0.0.0/8 is variably subnetted, 9 subnets, 2 masks i L2 10.10.0.0/16 [115/30] via 10.0.0.10, Serial0/0 i L2 10.11.0.0/16 [115/30] via 10.0.0.10, Serial0/0 i L2 10.8.0.0/16 [115/20] via 10.0.0.10, Serial0/0 C 10.0.0.8/30 is directly connected, Serial0/0 i L2 10.9.0.0/16 [115/30] via 10.0.0.10, Serial0/0 D 10.2.0.0/16 [90/2297856] via 10.0.0.1, 00:12:47, Serial0/1 D 10.3.0.0/16 [90/2297856] via 10.0.0.1, 00:12:47, Serial0/1 C 10.0.0.0/30 is directly connected, Serial0/1 D 10.1.0.0/16 [90/2297856] via 10.0.0.1, 00:12:47, Serial0/1
R3#sh ip route ！ Gateway of last resort is not set
10.0.0.0/8 is variably subnetted, 5 subnets, 2 masks i L1 10.10.0.0/16 [115/20] via 10.8.0.2, Serial0/0 i L1 10.11.0.0/16 [115/20] via 10.8.0.2, Serial0/0 C 10.8.0.0/16 is directly connected, Serial0/0 C 10.0.0.8/30 is directly connected, Serial0/1 i L1 10.9.0.0/16 [115/20] via 10.8.0.2, Serial0/0
R4#sh ip route
Gateway of last resort is 10.8.0.1 to network 0.0.0.0
10.0.0.0/16 is subnetted, 4 subnets C 10.10.0.0 is directly connected, Loopback1 C 10.11.0.0 is directly connected, Loopback2 C 10.8.0.0 is directly connected, Serial0/1 C 10.9.0.0 is directly connected, Loopback0 i*L1 0.0.0.0/0 [115/10] via 10.8.0.1, Serial0/1
在路由器R2上配置路由重分发： R2#sh run | be router ip router isis serial restart-delay 0 isis circuit-type level-2-only ! router eigrp 100 redistribute isis metric 2000 100 255 1 1500 network 10.0.0.0 auto-summary ! router isis net 49.0001.2222.2222.2222.00 is-type level-2-only redistribute eigrp 100 metric 20 metric-type external !
配置完路由重分发后各路由器上的路由表状况： R1# sh ip route ！ Gateway of last resort is not set
10.0.0.0/8 is variably subnetted, 9 subnets, 2 masks D EX 10.10.0.0/16 [170/2195456] via 10.0.0.2, 00:05:00, Serial0/0 D EX 10.11.0.0/16 [170/2195456] via 10.0.0.2, 00:05:00, Serial0/0 D EX 10.8.0.0/16 [170/2195456] via 10.0.0.2, 00:05:00, Serial0/0 D 10.0.0.8/30 [90/2681856] via 10.0.0.2, 00:37:31, Serial0/0 D EX 10.9.0.0/16 [170/2195456] via 10.0.0.2, 00:05:00, Serial0/0 C 10.2.0.0/16 is directly connected, Loopback1 C 10.3.0.0/16 is directly connected, Loopback2 C 10.0.0.0/30 is directly connected, Serial0/0 C 10.1.0.0/16 is directly connected, Loopback0
R2#sh ip route ！ Gateway of last resort is not set
10.0.0.0/8 is variably subnetted, 9 subnets, 2 masks i L2 10.10.0.0/16 [115/30] via 10.0.0.10, Serial0/0 i L2 10.11.0.0/16 [115/30] via 10.0.0.10, Serial0/0 i L2 10.8.0.0/16 [115/20] via 10.0.0.10, Serial0/0 C 10.0.0.8/30 is directly connected, Serial0/0 i L2 10.9.0.0/16 [115/30] via 10.0.0.10, Serial0/0 D 10.2.0.0/16 [90/2297856] via 10.0.0.1, 00:22:53, Serial0/1 D 10.3.0.0/16 [90/2297856] via 10.0.0.1, 00:22:53, Serial0/1 C 10.0.0.0/30 is directly connected, Serial0/1 D 10.1.0.0/16 [90/2297856] via 10.0.0.1, 00:22:53, Serial0/1
R3#sh ip route ！ Gateway of last resort is not set
10.0.0.0/8 is variably subnetted, 9 subnets, 2 masks i L1 10.10.0.0/16 [115/20] via 10.8.0.2, Serial0/0 i L1 10.11.0.0/16 [115/20] via 10.8.0.2, Serial0/0 C 10.8.0.0/16 is directly connected, Serial0/0 C 10.0.0.8/30 is directly connected, Serial0/1 i L1 10.9.0.0/16 [115/20] via 10.8.0.2, Serial0/0 i L2 10.2.0.0/16 [115/94] via 10.0.0.9, Serial0/1 i L2 10.3.0.0/16 [115/94] via 10.0.0.9, Serial0/1 i L2 10.0.0.0/30 [115/94] via 10.0.0.9, Serial0/1 i L2 10.1.0.0/16 [115/94] via 10.0.0.9, Serial0/1
R4#sh ip route ！ Gateway of last resort is 10.8.0.1 to network 0.0.0.0
10.0.0.0/16 is subnetted, 4 subnets C 10.10.0.0 is directly connected, Loopback1 C 10.11.0.0 is directly connected, Loopback2 C 10.8.0.0 is directly connected, Serial0/1 C 10.9.0.0 is directly connected, Loopback0 i*L1 0.0.0.0/0 [115/10] via 10.8.0.1, Serial0/1
走过路过，谢谢啊！
本文转自 tiger506 51CTO博客，原文链接：http://blog.51cto.com/tiger506/107861，如需转载请自行联系原作者
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