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EIGRP的路由彙總與認證

<b>實驗一、EIGRP的路由彙總</b>

實驗拓撲圖:

<a href="http://linuxtro.blog.51cto.com/attachment/201009/6/1239505_12837676060YzA.jpg"></a>

通過“no auto-summary”來關閉自動彙總,然後進行手工彙總,R4的配置如下:

R4(config)# router eigrp 1

R4(config-router)#no auto-summary

R4(config-router)#network 192.168.34.0

R4(config-router)#network 4.4.0.0 255.255.252.0

R4(config-router)#exit

在R3上檢視路由資訊如下:

R3#show ip route eigrp

D 192.168.12.0/24 [90/2681856] via 192.168.23.2, 00:06:15, Serial1/1

4.0.0.0/24 is subnetted, 4 subnets

D 4.4.0.0 [90/2297856] via 192.168.34.4, 00:34:35, Serial1/2

D 4.4.1.0 [90/2297856] via 192.168.34.4, 00:34:35, Serial1/2

D 4.4.2.0 [90/2297856] via 192.168.34.4, 00:34:35, Serial1/2

D 4.4.3.0 [90/2297856] via 192.168.34.4, 00:34:35, Serial1/2

D 1.1.1.0 [90/2809856] via 192.168.23.2, 00:00:52, Serial1/1

以上輸出表明關于R4有4條明細路由條目,

在R4的Serial1/2上執行路由彙總,在R3、R4上檢視路由表:

R4(config)#interface serial 1/2

R4(config-if)#ip summary-address ?

eigrp Enhanced Interior Gateway Routing Protocol (EIGRP)

rip Routing Information Protocol (RIP)

R4(config-if)#ip summary-address eigrp 1 4.4.0.0 255.255.252.0

R3的路由表資訊為:

<a href="http://linuxtro.blog.51cto.com/attachment/201009/6/1239505_12837676103ztt.jpg"></a>

<a href="http://linuxtro.blog.51cto.com/attachment/201009/6/1239505_12837676149Uvs.jpg"></a>

以上輸出顯示:在路由器R4上執行手工彙總後,會在自己的路由表中産生一條指向“null0”的EIGRP路由,主要是防止路由環路産生的,在路由器R3上收到被彙總的路由條目“4.4.0.0/22”。

【注】:當被彙總的明細路由條目全部down掉以後,彙總路由才自動從路由表中被删除,進而有效避免路由抖動。

<b>實驗二、EIGRP是否支援CIDR(無類域間路由)</b>

現在把R4的lo0—lo3的位址改為:

Lo0:172.16.12.4/24

lo1:172.16.13.4/24

lo2:172.16.14.4/24

lo3:172.16.15.4/24

觀察R4的S1/2是否能實作路由彙總?

R4的配置如下:

<a href="http://linuxtro.blog.51cto.com/attachment/201009/6/1239505_1283767618N71x.jpg"></a>

R4(config)#router eigrp 1

R4(config-router)#network 172.16.12.0 0.0.3.255

R4#show ip route

Codes: C - connected, S - static, 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

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

D 192.168.12.0/24 [90/3193856] via 192.168.34.3, 00:45:21, Serial1/2

1.0.0.0/24 is subnetted, 1 subnets

D 1.1.1.0 [90/3321856] via 192.168.34.3, 00:27:03, Serial1/2

172.16.0.0/24 is subnetted, 4 subnets

C 172.16.12.0 is directly connected, Loopback0

C 172.16.13.0 is directly connected, Loopback1

C 172.16.14.0 is directly connected, Loopback2

C 172.16.15.0 is directly connected, Loopback3

D 192.168.23.0/24 [90/2681856] via 192.168.34.3, 01:16:32, Serial1/2

C 192.168.34.0/24 is directly connected, Serial1/2

在R4路由器上執行手動彙總:

R4(config-if)#ip summary-address eigrp 1 172.16.12.0 255.255.252.0

在R3和R4上檢視一下:

<a href="http://linuxtro.blog.51cto.com/attachment/201009/6/1239505_1283767623Eyvc.jpg"></a>

<a href="http://linuxtro.blog.51cto.com/attachment/201009/6/1239505_12837676250R4X.jpg"></a>

從R3和R4路由表的輸出可以看出EIGRP是支援CIDR彙總的,這一點和RIPv2是不同的。

<b>實驗三、EIGRP認證</b>

配置R1路由器:

ip authenti mode eigrp 1 md5 //認證模式為md5

ip authenti key-chain eigrp 1 ccnp //在接口上調用鑰匙鍊

配置R2路由器的serial1/0接口:

R2(config)#key chain ccnp

R2(config-keychain)#key 1

R2(config-keychain-key)#key-string cisco

R2(config-keychain-key)#int s1/0

R2(config-if)#ip authenti mode eigrp 1 md5

R2(config-if)#ip authenti key-chain eigrp 1 ccnp

R2(config-if)#

*Mar 1 02:01:51.075: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 192.168.12.1 (Serial1/0) is up: new adjacency

R2(config-if)#exit

配置R2路由器的serial1/1接口

R2(config)#interface serial 1/1

R2(config-if)#ip authentication mode ei

R2(config-if)#ip authentication mode eigrp 1 ?

md5 Keyed message digest

R2(config-if)#ip authentication mode eigrp 1 md5

R2(config-if)#ip authentication key-chain ?

R2(config-if)#ip authentication key-chain eigrp ?

&lt;1-65535&gt; Autonomous system number

R2(config-if)#ip authentication key-chain eigrp 1 ?

WORD name of key-chain

R2(config-if)#ip authentication key-chain eigrp 1 ccnp

配置R3路由器的serial1/1接口:

R3(config)#key chain ccnp

R3(config-keychain)#key 1

R3(config-keychain-key)#key-string cisco

R3(config-keychain-key)#int s1/1

R3(config-if)#ip authentication mode eigrp 1 md5

R3(config-if)#ip authentication key-chain eigrp 1 ccnp

R3(config-if)#int s1/2

配置R4路由器的serial1/2接口:

R4(config)#key chain ccnp

R4(config-keychain)#key 1

R4(config-keychain-key)#key-string cisco

R4(config-keychain-key)#int s1/2

R4(config-if)#ip authentication mode eigrp 1 md5

R4(config-if)#ip authentication key-chain eigrp 1 ccnp

如果鑰匙鍊的密鑰正确,則會出現下面的提示資訊(以R4為例):

*Mar 1 03:25:06.283: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 192.168.34.3 (Serial1/2) is up: new adjacency

如果鑰匙鍊的密鑰不正确,則會出現下面的提示資訊(以R4為例):

*Mar 1 03:23:39.195: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 192.168.34.3 (Serial1/2) is down: Auth failure

本文轉自 linuxtro 51CTO部落格,原文連結:http://blog.51cto.com/linuxtro/388145,如需轉載請自行聯系原作者

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