RIP和EIGRP路由再发布
不同的动态路由协议之间需要交换路由表,也需要进行路由再发布。
打开随书光盘中第6章练习“07 RIP和EIGRP路由再发布.pkt”,网络拓扑如图6-23所示。网络中的路由器和计算机已经按照图示的地址配置完成。Router0和Router1运行了RIPv2,并且关闭了自动汇总,Router1和Router2运行了EIGRP协议。
你需要配置Router1将EIGRP协议学到的路由通过RIP协议通告给Router0;配置Router1将RIPv2学到的路由通过EIGRP协议通告给Router2。
▲图6-23 RIP和EIGRP路由再发布的网络拓扑
操作步骤如下。
(1)在Router1上运行show ip route命令查看路由表。
Router1#show ip route
Gateway of last resort is not set
10.0.0.0/30 is subnetted, 2 subnets
C 10.0.0.0 is directly connected, Serial3/0
C 10.0.0.4 is directly connected, Serial2/0
172.16.0.0/16 is variably subnetted, 4 subnets, 2 masks
R 172.16.0.0/24 [120/1] via 10.0.0.1, 00:00:26, Serial3/0
R 172.16.1.0/24 [120/1] via 10.0.0.1, 00:00:26, Serial3/0
R 172.16.2.0/24 [120/1] via 10.0.0.1, 00:00:26, Serial3/0
D 192.168.0.0/24 [90/20514560] via 10.0.0.6, 00:35:10, Serial2/0
可以看到在Router1上的路由表中包括了通过RIP协议学到的路由和通过EIGRP协议学到的路由。
(2)在Router0上查看路由表。
Router0#show ip route
Gateway of last resort is not set
10.0.0.0/30 is subnetted, 2 subnets
C 10.0.0.0 is directly connected, Serial2/0
R 10.0.0.4 [120/1] via 10.0.0.2, 00:00:14, Serial2/0
172.16.0.0/24 is subnetted, 3 subnets
C 172.16.0.0 is directly connected, FastEthernet0/0
C 172.16.1.0 is directly connected, FastEthernet1/0
C 172.16.2.0 is directly connected, FastEthernet6/0
可以看到Router1没有将其通过EIGRP学到的路由通过RIP协议通告给Router0。
(3)在Router2上查看路由表。
同样可以看到Router1没有将其通过RIP学到的路由通过EIGRP协议通告给Router2。
(4)在Router1上配置将EIGRP发布到RIP。
Router1#config t
Router1(config)#router rip
Router1(config-router)#redistribute eigrp 10 metric ?
<0-16> Default metric
transparent Transparently redistribute metric
Router1(config-router)#redistribute eigrp 10 metric 3
最后一条命令将EIGRP协议学到的路由度量值转化为RIP协议的度量值3。
(5)在Router1上配置将RIP发布到EIGRP。
Router1(config)#router eigrp 10
Router1(config-router)#redistribute rip metric 10000 100 255 1 1500
最后一条命令是将RIP学到的路由度量值转化为EIGRP的度量值。其中:
10000:是带宽,单位是kb/s;
100:是延迟,单位是10us;
255:是可靠性,值可以是0~255,255是100%可靠;
1:是负载,值可以是1~255,255是100%负载,即网络将要堵塞;
1500:是最大传输单元(MTU),单位为8比特字节。
(6)在Router0上查看路由表。
Router0#show ip route
Gateway of last resort is not set
10.0.0.0/30 is subnetted, 2 subnets
C 10.0.0.0 is directly connected, Serial2/0
R 10.0.0.4 [120/1] via 10.0.0.2, 00:00:04, Serial2/0
172.16.0.0/24 is subnetted, 3 subnets
C 172.16.0.0 is directly connected, FastEthernet0/0
C 172.16.1.0 is directly connected, FastEthernet1/0
C 172.16.2.0 is directly connected, FastEthernet6/0
R 192.168.0.0/24 [120/3] via 10.0.0.2, 00:12:34, Serial2/0
--学到了再发布的路由
(7)在Router2上查看路由表。
Router2#show ip route
Gateway of last resort is not set
10.0.0.0/8 is variably subnetted, 3 subnets, 2 masks
D 10.0.0.0/8 is a summary, 01:04:04, Null0
D 10.0.0.0/30 [90/21024000] via 10.0.0.5, 01:04:04, Serial3/0
C 10.0.0.4/30 is directly connected, Serial3/0
172.16.0.0/24 is subnetted, 3 subnets
D EX 172.16.0.0 [170/20537600] via 10.0.0.5, 00:07:39, Serial3/0
--再发布的路由
D EX 172.16.1.0 [170/20537600] via 10.0.0.5, 00:07:39, Serial3/0
--再发布的路由
D EX 172.16.2.0 [170/20537600] via 10.0.0.5, 00:07:39, Serial3/0
--再发布的路由
C 192.168.0.0/24 is directly connected, FastEthernet0/0
可以看到D EX开头的路由是EIGRP的外部路由,也就是RIP发布到EIGRP的路由,管理距离是170。
(8)在PC0 上ping PC2,测试网络是否通。
PC>ping 192.168.0.2
(9)在Router1上取消再发布。
Router1(config)#router eigrp 10
Router1(config-router)#no redistribute rip --取消EIGRP到RIP的发布
Router1(config)#router rip
Router1(config-router)#no redistribute eigrp 10 --取消RIP到EIGRP的发布
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