EIGRP非等价负载均衡

EIGRP的非等价路由负载均衡是指：

从路由器A到达指定目的地有多条路径，但这些路径的开销（带宽/延时）不同，默认情况下EIGRP只会选择开销低的路径来传输，下面实验将会让eigrp从两条不同带宽的链路上实现负载均衡

按照上图配置好接口与EIGRP，

R4：

interface Serial0/0

 bandwidth 256

 ip address 155.1.0.4 255.255.255.0

 encapsulation frame-relay

 clock rate 2000000

 frame-relay map ip 155.1.0.5 405 broadcast

 no frame-relay inverse-arp

！

interface Serial0/1

 bandwidth 64

 ip address 155.1.45.4 255.255.255.0

router eigrp 100

 network 150.1.4.4 0.0.0.0

 network 155.1.0.4 0.0.0.0

 network 155.1.45.4 0.0.0.0

 no auto-summary

R5：

 ip address 155.1.0.5 255.255.255.0

 frame-relay map ip 155.1.0.4 504 broadcast

 ip address 155.1.45.5 255.255.255.0

 clock rate 9600

 network 150.1.5.5 0.0.0.0

 network 155.1.0.5 0.0.0.0

 network 155.1.45.5 0.0.0.0

<b>配置非等价负载均衡之前</b>：我们查看路由表，看到只有1条路由

R5#show ip route eigrp

     150.1.0.0/24 is subnetted, 2 subnets

D       150.1.4.0 [90/10639872] via 155.1.0.4, 00:00:06, Serial0/0

查看拓扑表，注意红色部分，其中是两条链路的cost值，我们用40640000/10639872&lt;4

R5#show ip eigrp topology

IP-EIGRP Topology Table for AS(100)/ID(150.1.5.5)

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

       r - reply Status, s - sia Status

P 150.1.5.0/24, 1 successors, FD is 128256

        via Connected, Loopback0

P 150.1.4.0/24, 1 successors, FD is 10639872

        via 155.1.0.4 (10639872/128256), Serial0/0

        via 155.1.45.4 (40640000/128256), Serial0/1

P 155.1.0.0/24, 1 successors, FD is 10511872

        via Connected, Serial0/0

P 155.1.45.0/24, 1 successors, FD is 40512000

        via Connected, Serial0/1

非等价的路由配置

R5:

variance 4

<b>配置之后</b>

我们再看R5的路由表，是不是多了1条路由

D       150.1.4.0 [90/40640000] via 155.1.45.4, 00:00:10, Serial0/1

               [90/10639872] via 155.1.0.4, 00:00:10, Serial0/0

本文转自zcm8483 51CTO博客，原文链接:http://blog.51cto.com/haolun/993146