解析EIGRP浮动汇总路由配置

EIGRP协议在路由计算中要对网络带宽、网络时延、信道占用率和信道可信度等因素作全面的综合考虑，所以EIGRP的路由计算更为准确，更能反映网络的实际情况，下面跟小编看一下EIGRP浮动汇总路由配置过程。

　　EIGRP浮动汇总路由配置过程如下：

EIGRP浮动汇总路由配置之拓扑图

实例解析EIGRP浮动汇总路由配置

EIGRP浮动汇总路由配置之接口连接

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浮动汇总路由配置之原理

在R1R2R3R4上均运行EIGRP路由协议。R4通过S0/1向R3通告一条 的汇总路由，并将这条浮动路由的管理距离设置为250，于是在网络连通的情况下R3上到达网段的路由经过R2，而在R2与R3链路故障的时候，通过R3前往的数据包会通过R4(R3拓扑表中，默认路由由A变为P)

EIGRP浮动汇总路由配置之关键配置

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，参照R1进行接口IP和路由协议的配置，重点看下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通过默认路由，管理距离高于EIGRP默认值)!

router eigrp 100

network

network

auto-summary

　　EIGRP浮动汇总路由配置之查看结果

1.R2和R3之间链路正常时

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的拓扑表：

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设置为DOWN,观察R3路由表和拓扑表

　　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的拓扑表：

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