EIGRP彙總實驗：
一、實驗拓撲如上
二、配置三台路由器ip位址
r1#show ip int brief
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 unassigned YES unset administratively down down
Serial1/0 192.168.1.1 YES manual up up
Serial1/1 unassigned YES unset administratively down down
Serial1/2 unassigned YES unset administratively down down
Serial1/3 unassigned YES unset administratively down down
Loopback0 1.1.1.1 YES manual up up
r1#
r2#show ip int brief
Serial1/0 192.168.1.2 YES manual up up
Serial1/1 192.168.2.1 YES manual up up
r2#
r3#show ip int brief
Serial1/0 unassigned YES unset administratively down down
Serial1/1 192.168.2.2 YES manual up up
Loopback0 3.3.0.3 YES manual up up
Loopback1 3.3.1.3 YES manual up up
Loopback2 3.3.2.3 YES manual up up
Loopback3 3.3.3.3 YES manual up up
r3#
三、配置EIGRP路由選擇協定 AS：1
r1(config)#router eigrp 1
r1(config-router)#network 1.0.0.0
r1(config-router)#network 192.168.1.0
r1(config-router)#end
r1# //在這裡我們沒有關閉R1EIGRP路由選擇協定的自動彙總功能，在配置R3的時候我們關閉路由自動彙總功能，配置完成後我們檢視路由表....
00:05:53: %SYS-5-CONFIG_I: Configured from console by console
r3#conf t
r3(config)#router eigrp 1
r3(config-router)#no auto
r3(config-router)#network 192.168.2.0
r3(config-router)#network 3.0.0.0
r3(config-router)#end
R2配置我們這裡也先不關閉路由自動彙總功能
r2#conf t
Enter configuration commands, one per line. End with CNTL/Z.
r2(config)#router eigrp 1
r2(config-router)#network 192.168.1.0
r2(config-router)#network 192.168..0
00:06:06: %DUAL-5-NBRCHANGE: IP-EIGRP 1: Neighbor 192.168.1.1 (Serial1/0) is up: new adjacency
r2(config-router)#network 192.168.2.0
r2(config-router)#end
#
配置完成後我們在R1上檢視路由表
r1#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
1.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
D 1.0.0.0/8 is a summary, 00:03:35, Null0
C 1.1.1.0/24 is directly connected, Loopback0
3.0.0.0/24 is subnetted, 4 subnets
D 3.3.0.0 [90/2809856] via 192.168.1.2, 00:00:13, Serial1/0
D 3.3.1.0 [90/2809856] via 192.168.1.2, 00:00:13, Serial1/0
D 3.3.2.0 [90/2809856] via 192.168.1.2, 00:00:13, Serial1/0
D 3.3.3.0 [90/2809856] via 192.168.1.2, 00:00:13, Serial1/0
C 192.168.1.0/24 is directly connected, Serial1/0
D 192.168.2.0/24 [90/2681856] via 192.168.1.2, 00:03:19, Serial1/0
r1#ping 3.3.3.3
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 3.3.3.3, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 96/127/168 ms
我們發現，R1明明開啟了路由自動彙總功能，但是收到的R3通知的路由資訊，裡面仍然有子網的資訊，這時為什麼呢？
預設的時候 EIGRP 的自動彙總是開啟的，自動彙總隻對本地産生的 EIGRP路由彙總，可以通
過“no auto-summary”指令關閉自動彙總，然後進行手工彙總。
也就是說，R1上的路由自動彙總，隻對自己通告的網段起作用，對别的不起作用
現在，我們把三個路由上的EIGRP路由自動彙總功能全部關閉，然後在R3的S1/0接口上手動彙總路由
r3(config)#int s1/1
r3(config-if)#ip summary-address eigrp 1 3.3.0.0 255.255.252.0
r3(config-if)#end
我們檢視自己的路由表：
r3#show ip route
D 1.0.0.0/8 [90/2809856] via 192.168.2.1, 00:01:33, Serial1/1
3.0.0.0/8 is variably subnetted, 5 subnets, 2 masks
D 3.3.0.0/22 is a summary, 00:01:39, Null0
C 3.3.0.0/24 is directly connected, Loopback0
C 3.3.1.0/24 is directly connected, Loopback1
C 3.3.2.0/24 is directly connected, Loopback2
C 3.3.3.0/24 is directly connected, Loopback3
D 192.168.1.0/24 [90/2681856] via 192.168.2.1, 00:01:33, Serial1/1
C 192.168.2.0/24 is directly connected, Serial1/1
我們發現多了一條EIGRP路由條目，主要是為了防止路由環路。
在路由器1和路由器2上會收到彙總後的路由資訊。
r2#show ip route
D 1.0.0.0/8 [90/2297856] via 192.168.1.1, 00:18:44, Serial1/0
3.0.0.0/22 is subnetted, 1 subnets
D 3.3.0.0 [90/2297856] via 192.168.2.2, 00:03:44, Serial1/1
D 1.0.0.0/8 is a summary, 00:15:38, Null0
D 3.3.0.0 [90/2809856] via 192.168.1.2, 00:00:22, Serial1/0
D 192.168.2.0/24 [90/2681856] via 192.168.1.2, 00:15:22, Serial1/0
思考：如果我們把路由器3上的回環接口，改成192.168.96.3/24 192.168.97.3/24 192.168.98.3/24 192.168.99.3/24 那麼我們還能彙總到192.168.96.0/252嗎？？？？？？
Loopback0 192.168.96.3 YES manual up up
Loopback1 192.168.97.3 YES manual up up
Loopback2 192.168.98.3 YES manual up up
Loopback3 192.168.99.3 YES manual up up
r3(config-router)#network 192.168.96.0
r3(config-router)#network 192.168.97.0
r3(config-router)#network 192.168.98.0
r3(config-router)#network 192.168.99.0
r3(config-if)#ip summary-address eigrp 1 192.168.96.0 255.255.252.0
我們看到很順利的配置完成，沒有像RIP2那樣提示不讓這樣設定，
看路由1和2的路由表
r1#show ip route
D 1.0.0.0/8 is a summary, 00:38:46, Null0
D 192.168.2.0/24 [90/2681856] via 192.168.1.2, 00:38:30, Serial1/0
D 192.168.96.0/22 [90/2809856] via 192.168.1.2, 00:04:25, Serial1/0
![用DHCP網絡ghost的方法[圖]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)