解析EIGRP浮動彙總路由配置

EIGRP協議在路由計算中要對網絡帶寬、網絡時延、信道佔用率和信道可信度等因素作全面的綜合考慮，所以EIGRP的路由計算更為準確，更能反映網絡的實際情況，下面跟小編看一下EIGRP浮動彙總路由配置過程。

　　EIGRP浮動彙總路由配置過程如下：

EIGRP浮動彙總路由配置之拓撲圖

實例解析EIGRP浮動彙總路由配置

EIGRP浮動彙總路由配置之接口連接

Router1 S0/0 <----> Router2 S0/0

Router2 S0/1 <----> Router3 S0/0

Router1 S0/1 <----> Router4 S0/0

Router3 S0/1 <----> Router4 S0/1

VPCS V0/1 <----> Router1 E1/0

VPCS V0/2 <----> Router3 E1/0

EIGRP浮動彙總路由配置之原理

在R1R2R3R4上均運行EIGRP路由協議。R4通過S0/1向R3通告一條 的彙總路由，並將這條浮動路由的管理距離設置為250，於是在網絡連通的情況下R3上到達網段的路由經過R2，而在R2與R3鏈路故障的時候，通過R3前往的數據包會通過R4(R3拓撲表中，默認路由由A變為P)

EIGRP浮動彙總路由配置之關鍵配置

R1:

interface Serial0/0

ip address

serial restart-delay 0

!

interface Serial0/1

ip address

serial restart-delay 0

!

interface Ethernet1/0

ip address

half-duplex

!

router eigrp 100

network

network

network

no auto-summary

R2、R3略，參照R1進行接口IP和路由協議的配置，重點看下R4的配置

R4:

interface Serial0/0

ip address

serial restart-delay 0

!

interface Serial0/1

ip address

ip summary-address eigrp 100 250(向R3通過默認路由，管理距離高於EIGRP默認值)!

router eigrp 100

network

network

auto-summary

　　EIGRP浮動彙總路由配置之查看結果

1.R2和R3之間鏈路正常時

a) R3的'路由表：

R3#sh 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 to network

D [90/2707456] via , 00:00:02, Serial0/0

C is directly connected, Ethernet1/0

C is directly connected, Serial0/1

D [90/2681856] via , 00:00:02, Serial0/0

C is directly connected, Serial0/0

D [90/3193856] via , 00:00:02, Serial0/0

D* [90/2681856] via , 00:00:00, Serial0/1

　　b)R3的拓撲表：

R3#sh ip eigrp topology

IP-EIGRP Topology Table for AS(100)/ID()

Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,

r - reply Status, s - sia Status

A , 1 successors, FD is Inaccessible

1 replies, active 00:00:00, query-origin: Successor Origin

Remaining replies:

via , r, Serial0/0

P , 1 successors, FD is 2681856

via (2681856/2169856), Serial0/0

P , 1 successors, FD is 2169856

via Connected, Serial0/0

P , 1 successors, FD is 3193856

via (3193856/2681856), Serial0/0

P , 1 successors, FD is 2169856

via Connected, Serial0/1

P , 1 successors, FD is 2707456

via (2707456/2195456), Serial0/0

P , 1 successors, FD is 281600

via Connected, Ethernet1/0

2.R2的S0/1設置為DOWN,觀察R3路由表和拓撲表

　　a)R3路由表：

R3#sh 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 to network

C is directly connected, Ethernet1/0

C is directly connected, Serial0/1

C is directly connected, Serial0/0

D* [90/2681856] via , 00:00:05, Serial0/1

　　b)R3的拓撲表：

R3#sh ip eigrp topology

IP-EIGRP Topology Table for AS(100)/ID()

Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,

r - reply Status, s - sia Status

P , 1 successors, FD is 2681856

via (2681856/2169856), Serial0/1

P , 1 successors, FD is 2169856

via Connected, Serial0/1

P , 1 successors, FD is 281600

via Connected, Ethernet1/0