江浙沪招生考试网

实验要求:

  通过在两台路由器上配置IGRP路由协议实现路由器之间非等值带宽的负载平衡。

  

路由器R1配置如下：

Router > en                                                   进入特权模式

Router # conf t                                                进入全局配置模式

Router # host R1                                               更改路由器名

R1 (config)# int lo1                                            进入了loopback1口

R1 (config-if)# ip add 1.1.1.1 255.255.255.0   

R1 (config-if)# ^Z                                              直接退之特权模式

R1 #config t

R1 (config)# int s0                                              配置S0口

R1 (config-if)# ip add 2.2.2.1 255.255.255.0                         配置IP

R1 (config-if)# clock rate 56000                                   配置DCE端时钟

R1 (config-if)# no shut                                          启用端口

R1 (config-if)# exit

R1 (config)# router igrp 100                                      启用IGRP路由协议

R1 (config-router)# net 1.0.0.0.0                                  加入直连的网络号

R1 (config-router)# net 4.0.0.0

R1 (config-router)# net 2.0.0.0

R1 (config-router)#variance 6                                     设置variance值，可以在路径间启用负载平衡，把值设成6的依据是用低速带宽的METRIC值除高速带宽的METRIC值，如何看到低速带宽的METRIC值呢（因路由表缺省只显示最优路由）？把高速带宽的端口禁用，就可看到低速带宽的METRIC值了

R1 (config)# debug ip icmp

路由器R2配置如下：

Router> en

Router# config t

Router (config)# host R2

R2 (config-if)# int s0

R2 (config-if)# ip add 2.2.2.2  255.255.255.0

R2 (config-if)# no shut

R2 (config-if)# exit

R2 (config)# int lo1

R2 (config-if)# ip add 4.4.4.2 255.255.255.0

R2 (config-if)# exit

R2 (config)# router igrp 100

R2 (config-router)# net 3.0.0.0

R2 (config-router)# net 4.0.0.0

R2 (config-router)# net 2.0.0.0

R2 (config-router)# variance 6

Router (config)# debug ip icmp

三．实验结果：

r1#ping

Protocol [ip]:

Target IP address: 3.3.3.1

Repeat count [5]: 14

Datagram size [100]:

Timeout in seconds [2]:

Extended commands [n]:

Sweep range of sizes [n]:

Type escape sequence to abort.

Sending 14, 100-byte ICMP Echos to 3.3.3.1, timeout is 2 seconds:

!!!!!!!!!!!!!!

Success rate is 100 percent (14/14), round-trip min/avg/max = 8/14/40 ms

r1#

00:21:18: ICMP: echo reply rcvd, src 3.3.3.1, dst 4.4.4.1#####

00:21:18: ICMP: echo reply rcvd, src 3.3.3.1, dst 2.2.2.1

00:21:18: ICMP: echo reply rcvd, src 3.3.3.1, dst 4.4.4.1#####

00:21:18: ICMP: echo reply rcvd, src 3.3.3.1, dst 2.2.2.1

R2#ping

Protocol [ip]:

Target IP address: 1.1.1.1

Repeat count [5]: 14

Datagram size [100]:

Timeout in seconds [2]:

Extended commands [n]:

Sweep range of sizes [n]:

Type escape sequence to abort.

Sending 14, 100-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds:

!!!!!!!!!!!!!!

Success rate is 100 percent (14/14), round-trip min/avg/max = 8/15/44 ms

R2#

00:30:26: ICMP: echo reply rcvd, src 1.1.1.1, dst 4.4.4.2#####

00:30:26: ICMP: echo reply rcvd, src 1.1.1.1, dst 2.2.2.2

00:30:26: ICMP: echo reply rcvd, src 1.1.1.1, dst 4.4.4.2#####

00:30:26: ICMP: echo reply rcvd, src 1.1.1.1, dst 2.2.2.2