EIGRP特性-Variance参数与不等价负载均衡配置实例

1、配置过程如下：-PC1的配置-PC1(config#no ip routingPC1(config#ip default-gateway 10.1.1.1PC1(config#interface e0/0PC1(config-if#ip address 10.1.1.100 255.255.255.0PC1(config-if#no shutdownPC1(config-if#endPC1#-PC2的配置-PC2#configure terminalPC2(config#no ip routingPC2(config#ip default-gateway 192.168.1.2PC2(conf

2、ig#interface e0/0PC2(config-if#ip address 192.168.1.100 255.255.255.0PC2(config-if#no shutdownPC2(config-if#end-R1的配置-R1#configure terminalR1(config#interface f0/0R1(config-if#ip address 10.1.1.1 255.255.255.0R1(config-if#no shutdown R1(config-if#interface s1/0R1(config-if#ip address 12.12.12.1 255.

3、255.255.0R1(config-if#no shutdown R1(config-if#interface s1/1R1(config-if#ip address 21.21.21.1 255.255.255.0R1(config-if#no shutdown R1(config-if#exitR1(config#router eigrp 100R1(config-router#network 10.1.1.0   0.0.0.255R1(config-router#network 12.12.12.0 0.0.0.255R1(config-router#networ

4、k 21.21.21.0 0.0.0.255R1(config-router#no auto-summaryR1(config-router#endR1#-R2的配置-R2#configure terminalR2(config#interface s1/0R2(config-if#bandwidth 64R2(config-if#ip address 12.12.12.2 255.255.255.0R2(config-if#no shutdown R2(config-if#interface s1/1R2(config-if#bandwidth 128R2(config-if#ip addr

5、ess 21.21.21.2 255.255.255.0R2(config-if#no shutdown R2(config-if#interface f0/0R2(config-if#ip address 192.168.1.2 255.255.255.0R2(config-if#no shutdown R2(config-if#exitR2(config#router eigrp 100R2(config-router#network 192.168.1.0 0.0.0.255R2(config-router#network 12.12.12.0  0.0.0.255R

6、2(config-router#network 21.21.21.0  0.0.0.255R2(config-router#!variance 2R2(config-router#no auto-summaryR2(config-router#endR2#快捷配置方式，直接在SecurCRT标签中粘贴即可，SecurCRT的使用参考-PC1的配置-configure terminalno ip routingip default-gateway 10.1.1.1interface e0/0ip address 10.1.1.100 255.255.255.0no shutd

7、ownend-PC2的配置-configure terminalno ip routingip default-gateway 192.168.1.2interface e0/0ip address 192.168.1.100 255.255.255.0no shutdownend-R1的配置-configure terminalinterface f0/0ip address 10.1.1.1 255.255.255.0no shutdown interface s1/0ip address 12.12.12.1 255.255.255.0no shutdown interface s1/1

8、ip address 21.21.21.1 255.255.255.0no shutdown exitrouter eigrp 100network 10.1.1.0   0.0.0.255network 12.12.12.0 0.0.0.255network 21.21.21.0 0.0.0.255no auto-summaryend-R2的配置-configure terminalinterface s1/0bandwidth 64ip address 12.12.12.2 255.255.255.0no shutdown interface s1/1bandwidth

9、 128ip address 21.21.21.2 255.255.255.0no shutdown interface f0/0ip address 192.168.1.2 255.255.255.0no shutdown exitrouter eigrp 100network 192.168.1.0 0.0.0.255network 12.12.12.0  0.0.0.255network 21.21.21.0  0.0.0.255no auto-summaryend验证:在没有修改variance的值之前,在R2上显示路由表R2#show ip r

10、oute          Gateway of last resort is not set     21.0.0.0/24 is subnetted, 1 subnetsC       21.21.21.0 is directly connected, Serial1/1     10.0.0.0/24 is subnetted, 1 subnetsD       10.1

11、.1.0 90/20514560 via 21.21.21.1, 00:04:53, Serial1/1     12.0.0.0/24 is subnetted, 1 subnetsC       12.12.12.0 is directly connected, Serial1/0C    192.168.1.0/24 is directly connected, FastEthernet0/0可以看到只有一条到达10.1.1.0 的路径。配置variance 2命令：R2#configur

12、e terminalR2(config#router eigrp 100R2(config-router#variance 2R2#endR2#show ip route  Gateway of last resort is not set     21.0.0.0/24 is subnetted, 1 subnetsC       21.21.21.0 is directly connected, Serial1/1     10.0.0.0/24 is

13、 subnetted, 1 subnetsD       10.1.1.0 90/20514560 via 21.21.21.1, 00:00:52, Serial1/1                 90/40514560 via 12.12.12.1, 00:00:52, Serial1/0     12.0.0.0/24 is subnetted, 1 subnetsC       12.12.12.0 is directly connected, Serial1/0C    192.168.1.0/24 is directly connected, FastEthernet0/0现在可以看到，到达10.1.1.0 有两条路径。说明：variance 的值默认是1,代表等价链路的均衡负载，它的取值范围1128，这个乘数代表了可以接受的不等价链路的度量值的倍数，在这个范围内的链路都将被接受，并且被加