实验目的：
1、掌握EIGRP的路由汇总。
2、理解EIGRP汇总时的null路由。
实验拓扑：
实验步骤：
1、依据图中拓扑配置各设备的IP地址，并保证直连连通性;
在R1上做如下配置：
R1(config)#int f0/0 R1(config-if)#no shutdown R1(config-if)#ip address 12.1.1.1 255.255.255.0 R1(config-if)#exit R1(config)#int f1/0 R1(config-if)#no shutdown R1(config-if)#ip address 13.1.1.1 255.255.255.0 R1(config-if)#exit R1(config)#int loopback 1 R1(config-if)#ip address 1.1.1.1 255.255.255.255 R1(config-if)#exit
在R2上做如下配置：
R2(config)#int f0/0 R2(config-if)#no shutdown R2(config-if)#ip address 12.1.1.2 255.255.255.0 R2(config-if)#exit R2(config)#int f1/0 R2(config-if)#no shutdown R2(config-if)#ip address 23.1.1.2 255.255.255.0 R2(config-if)#exit R2(config)#int loopback 1 R2(config-if)#ip address 2.2.2.2 255.255.255.255 R2(config-if)#exit
在R3上做如下配置：
R3(config)#int f0/0 R3(config-if)#no shutdown R3(config-if)#ip address 13.1.1.3 255.255.255.0 R3(config-if)#exit R3(config-if)#int f1/0 R3(config-if)#no shutdown R3(config-if)#ip address 23.1.1.3 255.255.255.0 R3(config-if)#exi R3(config)#int loopback 1 R3(config-if)#ip address 3.3.3.3 255.255.255.255 R3(config-if)#exit R3(config)#int loopback 2 R3(config-if)#ip address 172.16.0.1 255.255.255.0 R3(config-if)#ip address 172.16.1.1 255.255.255.0 secondary R3(config-if)#ip address 172.16.2.1 255.255.255.0 secondary R3(config-if)#ip address 172.16.3.1 255.255.255.0 secondary R3(config-if)#exit
在其中一台路由器上进行连通性测试：
R1#ping 12.1.1.2 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 12.1.1.2, timeout is 2 seconds: .!!!! Success rate is 80 percent (4/5), round-trip min/avg/max = 20/34/48 ms R1#ping 13.1.1.3 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 13.1.1.3, timeout is 2 seconds: .!!!! Success rate is 80 percent (4/5), round-trip min/avg/max = 16/31/48 ms
此时说明直连连接没有问题。
2.在每台路由器开始进行EIGRP的配置，R1的配置如下：
R1(config)#router eigrp 100 R1(config-router)#no auto-summary R1(config-router)#network 12.1.1.0 0.0.0.255 R1(config-router)#network 13.1.1.0 0.0.0.255 R1(config-router)#network 1.1.1.1 0.0.0.0 R1(config-router)#exit
R2的配置如下：
R2(config)#router eigrp 100 R2(config-router)#no auto-summary R2(config-router)#network 12.1.1.0 0.0.0.255 R2(config-router)#network 23.1.1.0 0.0.0.255 R2(config-router)#network 2.2.2.2 0.0.0.0 R2(config-router)#exit
R3的配置如下：
R3(config)#router eigrp 100 R3(config-router)#no auto-summary R3(config-router)#network 13.1.1.0 0.0.0.255 R3(config-router)#network 23.1.1.0 0.0.0.255 R3(config-router)#network 3.3.3.3 0.0.0.0 R3(config-router)#network 172.16.0.0 0.0.255.255 R3(config-router)#exit
3、查看R1和R2的路由表，如下：
R1#show ip route eigrp
2.0.0.0/32 is subnetted, 1 subnets
D 2.2.2.2 [90/156160] via 12.1.1.2, 00:41:17, FastEthernet0/0
3.0.0.0/32 is subnetted, 1 subnets
D 3.3.3.3 [90/156160] via 13.1.1.3, 00:41:16, FastEthernet1/0
23.0.0.0/24 is subnetted, 1 subnets
D 23.1.1.0 [90/30720] via 13.1.1.3, 00:41:19, FastEthernet1/0
[90/30720] via 12.1.1.2, 00:41:19, FastEthernet0/0
172.16.0.0/24 is subnetted, 4 subnets
D 172.16.0.0 [90/156160] via 13.1.1.3, 00:00:06, FastEthernet1/0
D 172.16.1.0 [90/156160] via 13.1.1.3, 00:00:06, FastEthernet1/0
D 172.16.2.0 [90/156160] via 13.1.1.3, 00:00:06, FastEthernet1/0
D 172.16.3.0 [90/156160] via 13.1.1.3, 00:00:06, FastEthernet1/0
R2#show ip route eigrp
1.0.0.0/32 is subnetted, 1 subnets
D 1.1.1.1 [90/156160] via 12.1.1.1, 00:41:29, FastEthernet0/0
3.0.0.0/32 is subnetted, 1 subnets
D 3.3.3.3 [90/156160] via 23.1.1.3, 00:41:28, FastEthernet1/0
172.16.0.0/24 is subnetted, 4 subnets
D 172.16.0.0 [90/156160] via 23.1.1.3, 00:00:18, FastEthernet1/0
D 172.16.1.0 [90/156160] via 23.1.1.3, 00:00:18, FastEthernet1/0
D 172.16.2.0 [90/156160] via 23.1.1.3, 00:00:18, FastEthernet1/0
D 172.16.3.0 [90/156160] via 23.1.1.3, 00:00:18, FastEthernet1/0
13.0.0.0/24 is subnetted, 1 subnets
D 13.1.1.0 [90/30720] via 23.1.1.3, 00:41:29, FastEthernet1/0
[90/30720] via 12.1.1.1, 00:41:29, FastEthernet0/0
可以看到，此时R1和R2从R3学到4条精细路由，为缩减路由表并提高路由器转发效率，将此4条精细子网进行汇总。
4.在R3上执行路由汇总，如下：
R3(config)#int f0/0 R3(config-if)#ip summary-address eigrp 100 172.16.0.0 255.255.252.0 R3(config-if)#exit R3(config)#int f1/0 R3(config-if)#ip summary-address eigrp 100 172.16.0.0 255.255.252.0 R3(config-if)#exit
在R1和R2上再次查看路由表，如下：
R1#show ip route eigrp
2.0.0.0/32 is subnetted, 1 subnets
D 2.2.2.2 [90/156160] via 12.1.1.2, 00:54:23, FastEthernet0/0
3.0.0.0/32 is subnetted, 1 subnets
D 3.3.3.3 [90/156160] via 13.1.1.3, 00:54:23, FastEthernet1/0
23.0.0.0/24 is subnetted, 1 subnets
D 23.1.1.0 [90/30720] via 13.1.1.3, 00:54:26, FastEthernet1/0
[90/30720] via 12.1.1.2, 00:54:26, FastEthernet0/0
172.16.0.0/22 is subnetted, 1 subnets
D 172.16.0.0 [90/156160] via 13.1.1.3, 00:00:06, FastEthernet1/0
R2#show ip route eigrp
1.0.0.0/32 is subnetted, 1 subnets
D 1.1.1.1 [90/156160] via 12.1.1.1, 00:54:29, FastEthernet0/0
3.0.0.0/32 is subnetted, 1 subnets
D 3.3.3.3 [90/156160] via 23.1.1.3, 00:54:28, FastEthernet1/0
172.16.0.0/22 is subnetted, 1 subnets
D 172.16.0.0 [90/156160] via 23.1.1.3, 00:00:13, FastEthernet1/0
13.0.0.0/24 is subnetted, 1 subnets
D 13.1.1.0 [90/30720] via 23.1.1.3, 00:54:29, FastEthernet1/0
[90/30720] via 12.1.1.1, 00:54:29, FastEthernet0/0
此时可以看到，原本的4条精细路由汇总成一条路由，说明汇总成功。在R3上查看路由表，如下：
R3#show ip route eigrp
1.0.0.0/32 is subnetted, 1 subnets
D 1.1.1.1 [90/156160] via 13.1.1.1, 00:58:02, FastEthernet0/0
2.0.0.0/32 is subnetted, 1 subnets
D 2.2.2.2 [90/156160] via 23.1.1.2, 00:58:02, FastEthernet1/0
172.16.0.0/16 is variably subnetted, 5 subnets, 2 masks
D 172.16.0.0/22 is a summary, 00:03:47, Null0
12.0.0.0/24 is subnetted, 1 subnets
D 12.1.1.0 [90/30720] via 23.1.1.2, 00:58:02, FastEthernet1/0
[90/30720] via 13.1.1.1, 00:58:02, FastEthernet0/0
上面的NULL路由是EIGRP汇总时自动生成的，是用于解决不精确汇总可能引发的路由环路。<在PingingLab后续高级路由章节有详细描述>此实验完成。
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