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
clock rate 2000000
！
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：
interface Serial0/0
bandwidth 256
ip address 155.1.0.5 255.255.255.0
encapsulation frame-relay
clock rate 2000000
frame-relay map ip 155.1.0.4 504 broadcast
no frame-relay inverse-arp
！
interface Serial0/1
bandwidth 64
ip address 155.1.45.5 255.255.255.0
clock rate 9600
！
router eigrp 100
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
配置非等价负载均衡之前：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<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:
router eigrp 100
variance 4
配置之后
我们再看R5的路由表，是不是多了1条路由
R5#show ip route eigrp
150.1.0.0/24 is subnetted, 2 subnets
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
