本节是对IGRP的基本配置的相关操作及讲解。
1.实验目的 通过本实验，读者可以掌握以下技能:
在器上启动IGRP;
声明相应网络进入IGRP路由进程;
查看路由表，
查看IGRP配置信息;
监测IGRP协议相关信息。
2. 设备需求 本实验需要以下设备:
路由器3台，分别命名为R1、R2和R3，均要求具有1个以太网接口和2个串行接口。
3条DCE电缆和3条DTE电缆，或3条DCE转DTE电缆;
1台终端，如2509路由器，及用于反向Telnet的相应电缆;
1台带有超级终端程序的PC机，以及Console电缆及转接器。
3. 拓扑结构及配置说明 本实验的拓扑结构如图5-4所示。
IP地址分配如下:
R1:E0 172.16.1.1, S0 172.16.12.1，S1 172.16.13.1;
R2:E0 172.16.2.2. 50 172.16.12.2, 51 172.16.23.2;
R3:E0 172.16.3.3, 50 172.16.13.3, 51 172.16.23.30
子网掩码均为 255.255.255.00
本实验要求通过对IGRP路由选择协议的配置。
4.实验配置及监测结果 实现全网的连通性。
各设备启动后，首先完成每台路由器各接口的设置。在完成接口设置的基础上，配置IGRP路由协议。熟悉了RIP协议的配置之后，IGRP协议的配置变得比较容易，从基本配置来说，它们很相似。
配置清单5-4记录了EGRP协议的配置及监测信息。
配置清单5-4 IGRP协议的基本配置 第1段:R1配置清单
R1#sh runn
Building configuration...
Current configuration : 732 bytes
!
version 12.1
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname R1
!
ip subnet-zero
!
interface Ethernet0
ip address 172.16.1.1255.255.255.0
no keepalive
!
interface Serial0
ip address 172.16.12.1255.255.255.0
clockrate 500000
bandwidth 500
!
interface Serial1
ip address 172.16.13.1255.255.255.0
clockrate 500000
bandwidth 500
!
router igrp 100
network 172.16.0.0
!
ip classless
ip http server
!
!
line con 0
exec-timeout 0 0
logging synchronous
line aux 0
line vty 0 4
password cisco
login
!
end
第2段:R2配置清单
R2#sh run
Building configuration...
Current configuration : 558 bytes
!
version 12.1
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname R2
!
ip subnet-zero
no ip finger
!
interface Ethernet0
ip address 172.16.2.2 255.255.255.0
no keepalive
!
interface Serial0
ip address 172.16.12.2 255.255.255.0
bandwidth 500
!
interface Serial1
ip address 172.16.23.2 255.255.255.0
clockrate 64000
bandwidth 64
!
router igrp 100
network 172.16.0.0
!
ip classless
ip http server
!
line con 0
logging synchronous
transport input none
line aux 0
line vty 0 4
!
end
第3段:R3配置清单
R3#sh run
Building configuration...
Current configuration : 623 bytes
!
version 12.1
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname R3
!
no logging console
ip subnet-zero
no ip finger
!
interface Ethernet0
ip address 172.16.33 255.255.255.0
no keepalive
!
interface Serial0
ip address 172.16.13.3 255.255.255.0
bandwidth 500
interface Serial 1
ip address 172.16.23.3 255.255.255.0
bandwidth 64
!
router igrp 100
network 172.16.0.0
!
ip classless
ip http server
!
line con 0
logging synchronous
transport input none
line aux 0
line vty 0 4
!
end
第4段:show和debug
R1#sh ip route igrp
172.16,0,0/24 is subnetted, 6 subnets
I 172.16.23.0 [100/160250] via 172.16.12.2, 00:00:59, Serial0
[100/160250] via 172.16.13.3, 00:00:30, Serial1
I 172.16.2.0 [100/22100] via 172.16.12.2, 00:00:59, Serial0
I 172.16.3.0 [100/22100] via 172.16.13.3, 00:00:30, Serial1
R1#
Term_Server>2
[Resuming connection 1 to R2 ... ]
R2#sh ip route igrp
172.16.0.0/24 is subnetted, 6 subnets
I 172.16.13.0 [100/24000] via 172.16.12.1, 00:00:21, Serial0
I 172.16.1.0 [100/22100] via 172.16.12.1, 00:00:21, Serial0
I 172.16.3.0 [100/24100] via 172.16.12.1, 00:00:21, Senal0
R2#
Term_Server>3
[Resuming connection 1 to R3 ... ]
R3#sh ip route igrp
172.16.0.0/24 is subnetted, 6 subnets
I 172.16.12.0 [100/24000] via 172.16.13.1, 00:00:47, Serial0
I 172.16.1.0 [100/22100] via 172.16.13.1, 00:00:47, Serial0
I 172.16.2.0 [100/24100] via 172.16.13.1, 00:00:47, Serial0
R3#sh ip prof
Routing Protocol is "igrp 100"
Sending updates every 90 seconds, next due in 25 seconds
Invalid after 270 seconds, hold down 280, flushed after 630
Outgoing update filter list for all interfaces is
Incoming update filter list for ail interfaces is
Default networks flagged in outgoing updates
Default networks accepted from incoming updates
IGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0
IGRP maximum hopcount 100
IGRP maximum metric variance 1
Redistributing: igrp 100
Routing for Networks:
172.16.0.0
Routing Information Sources:
Gateway Distance Last Update
172.16.23.2 100 00:00:28
172.16.13.1 100 00:00:09
Distance: (default is 100)
R3#ping 172.16.12.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.16.12.1, timeout is 2 seconds:
!!!!!
Success rate is 1 (X) percent (5/5), round-trip min/avg/max == 8/12/28 ms
R3#trace 172.16.12.1
Type escape sequence to abort.
Tracing the route to 172.16.12.1
1 172.16.13.1 4 msec 4 msec *
(1)与RIP协议配置不同的是，在IGRP协议的配置申，我们没有一步步地给出配置过程，而是给出了操作完成后的配置清单。通过各路由器的配置清单可以清楚地了解到它们的配置。
(2)bandwidth500命令设置对应接口的速率为500kbit/s，bandwidth64则设置对应接口速率为64kbit/s。在RIP协议的配置中，这个命令对于路由选择没有实际意义，因为RIP是以跳数为惟一度量值的;而对IGRP协议，这个命令很重要，只有加入这个命令，所计算出的路由表才能真实反映不同路径的带宽情况。带宽是IGRP协议的度量值之一。
(3)使用router igrp命令创建IGRP路由进程，后面的"100"是自治系统号。3个路
【责编:admin】
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