RIPV2是RIP的第二代協議，它與RIP的主要區別在於一個是RIP發包走的是廣播，RIPv2發包走的是組播，另外一個就是RIPv2支持變長VLSM可擴展的子網掩碼，支持手動彙總，通過實驗觀察RIPv2如何支持VLSM以及自動彙總與手動彙總的區別。
實驗拓撲：
實驗內容：
1.路由器的基本配置
R1上的基本配置
interface Loopback1
ip address 1.1.1.1 255.255.255.0
!
（爲了測試RIPV2的彙總我們在這裏起用了5個環回接口）
interface Loopback2
ip address 10.1.1.1 255.255.255.0
!
interface Loopback3
ip address 10.1.2.1 255.255.255.0
!
interface Loopback4
ip address 10.1.3.1 255.255.255.0
!
interface Loopback5
ip address 10.1.4.1 255.255.255.0
!
interface Loopback6
ip address 10.1.5.1 255.255.255.0
!
interface Ethernet0
ip address 192.168.10.1 255.255.255.0
interface Serial0
ip address 192.168.2.1 255.255.255.0
clockrate 64000
R2上的基本配置
interface Serial0
ip address 192.168.3.1 255.255.255.0
clockrate 64000
!
interface Serial1
ip address 192.168.2.2 255.255.255.0
R3上的基本配置
interface Loopback0
ip address 3.3.3.3 255.255.255.0
!
interface Ethernet0
ip address 192.168.10.2 255.255.255.0
!
interface Serial0
no ip address
shutdown
!
interface Serial1
ip address 192.168.3.2 255.255.255.0
2．配置RIP,並提升爲v2版本,爲各個路由器起RIP
將RIP提升爲V2版本的命令如下：
router(config )#router rip
router(config-route)#version 2
R1上的RIP配置
router rip
version 2（注：比較與RIPV1的不同，此處多了一個version 2）
network 1.0.0.0
network 10.0.0.0
network 192.168.2.0
network 192.168.10.0
R2上的RIP配置
router rip
version 2
network 192.168.2.0
network 192.168.3.0
R3上的RIP配置
router rip
version 2
network 3.0.0.0
network 192.168.3.0
network 192.168.10.0
3．查看此時的路由表
R1上的路由表
R1#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is not set
1.0.0.0/24 is subnetted, 1 subnets
C 1.1.1.0 is directly connected, Loopback1
R 3.0.0.0/8 [120/1] via 192.168.10.2, 00:00:02, Ethernet0
C 192.168.10.0/24 is directly connected, Ethernet0
10.0.0.0/24 is subnetted, 5 subnets
C 10.1.3.0 is directly connected, Loopback4
C 10.1.2.0 is directly connected, Loopback3
C 10.1.1.0 is directly connected, Loopback2
C 10.1.5.0 is directly connected, Loopback6
C 10.1.4.0 is directly connected, Loopback5
C 192.168.2.0/24 is directly connected, Serial0
R 192.168.3.0/24 [120/1] via 192.168.2.2, 00:00:11, Serial0
R2上的路由表
R2#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is not set
R 1.0.0.0/8 [120/1] via 192.168.2.1, 00:00:02, Serial1
R 3.0.0.0/8 [120/1] via 192.168.3.2, 00:00:29, Serial0
R 192.168.10.0/24 [120/1] via 192.168.2.1, 00:00:02, Serial1
R 10.0.0.0/8 [120/1] via 192.168.2.1, 00:00:02, Serial1
C 192.168.2.0/24 is directly connected, Serial1
C 192.168.3.0/24 is directly connected, Serial0
R3上的路由表
R3#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is not set
R 1.0.0.0/8 [120/1] via 192.168.10.1, 00:00:04, Ethernet0
3.0.0.0/24 is subnetted, 1 subnets
C 3.3.3.0 is directly connected, Loopback0
C 192.168.10.0/24 is directly connected, Ethernet0
R 10.0.0.0/8 [120/1] via 192.168.10.1, 00:00:04, Ethernet0
R 192.168.2.0/24 [120/1] via 192.168.3.1, 00:00:13, Serial1
C 192.168.3.0/24 is directly connected, Serial1
因爲RIPV2彙總默認是啓動的，所以我們在這裏看到，在R2上還是彙總以後的路由表。
4．R1上去掉自動路由彙總，然後觀察路由表
去掉路由自動彙總的命令：
router(config)#router rip
router(config-route)#no auto-summary
此時再看路由表
R1上的路由表
R1#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is not set
1.0.0.0/24 is subnetted, 1 subnets
C 1.1.1.0 is directly connected, Loopback1
R 3.0.0.0/8 [120/1] via 192.168.10.2, 00:00:02, Ethernet0
C 192.168.10.0/24 is directly connected, Ethernet0
10.0.0.0/24 is subnetted, 5 subnets
C 10.1.3.0 is directly connected, Loopback4
C 10.1.2.0 is directly connected, Loopback3
C 10.1.1.0 is directly connected, Loopback2
C 10.1.5.0 is directly connected, Loopback6
C 10.1.4.0 is directly connected, Loopback5
C 192.168.2.0/24 is directly connected, Serial0
R 192.168.3.0/24 [120/1] via 192.168.2.2, 00:00:11, Serial0
R2上的路由表
R2#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is not set
1.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
R 1.1.1.0/24 [120/1] via 192.168.2.1, 00:00:01, Serial1
R 1.0.0.0/8 [120/2] via 192.168.3.2, 00:00:01, Serial0
R 3.0.0.0/8 [120/1] via 192.168.3.2, 00:00:01, Serial0
R 192.168.10.0/24 [120/1] via 192.168.3.2, 00:00:01, Serial0
10.0.0.0/8 is variably subnetted, 6 subnets, 2 masks
R 10.1.3.0/24 [120/1] via 192.168.2.1, 00:00:01, Serial1
R 10.1.2.0/24 [120/1] via 192.168.2.1, 00:00:02, Serial1
R 10.1.1.0/24 [120/1] via 192.168.2.1, 00:00:02, Serial1
R 10.0.0.0/8 [120/2] via 192.168.3.2, 00:00:02, Serial0
R 10.1.5.0/24 [120/1] via 192.168.2.1, 00:00:02, Serial1
R 10.1.4.0/24 [120/1] via 192.168.2.1, 00:00:02, Serial1
C 192.168.2.0/24 is directly connected, Serial1
C 192.168.3.0/24 is directly connected, Serial0
R3上的路由表
R3#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is not set
R 1.0.0.0/8 [120/1] via 192.168.10.1, 00:00:04, Ethernet0
3.0.0.0/24 is subnetted, 1 subnets
C 3.3.3.0 is directly connected, Loopback0
C 192.168.10.0/24 is directly connected, Ethernet0
R 10.0.0.0/8 [120/1] via 192.168.10.1, 00:00:04, Ethernet0
R 192.168.2.0/24 [120/1] via 192.168.3.1, 00:00:13, Serial1
C 192.168.3.0/24 is directly connected, Serial1
觀察R2上的路由表變化，當我們去掉R1上的自動彙總以後，R1傳給R2的路由將不再是彙總的。
R1上設置手動彙總，觀察手動彙總的結果
手動彙總的命令：
R1(config-if)#int s0
R1(config-if)#ip summary-address rip 10.1.0.0 255.255.0.0
觀察路由表
R1#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is not set
1.0.0.0/24 is subnetted, 1 subnets
C 1.1.1.0 is directly connected, Loopback1
R 3.0.0.0/8 [120/1] via 192.168.10.2, 00:00:02, Ethernet0
C 192.168.10.0/24 is directly connected, Ethernet0
10.0.0.0/24 is subnetted, 5 subnets
C 10.1.3.0 is directly connected, Loopback4
C 10.1.2.0 is directly connected, Loopback3
C 10.1.1.0 is directly connected, Loopback2
C 10.1.5.0 is directly connected, Loopback6
C 10.1.4.0 is directly connected, Loopback5
C 192.168.2.0/24 is directly connected, Serial0
R 192.168.3.0/24 [120/1] via 192.168.2.2, 00:00:11, Serial0
R2上的路由表
R2#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is not set
1.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
R 1.0.0.0/8 [120/2] via 192.168.3.2, 00:00:01, Serial0
R 1.1.1.0/24 [120/1] via 192.168.2.1, 00:00:01, Serial1
R 3.0.0.0/8 [120/1] via 192.168.3.2, 00:00:01, Serial0
R 192.168.10.0/24 [120/1] via 192.168.2.1, 00:00:01, Serial1
10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
R 10.0.0.0/8 [120/2] via 192.168.3.2, 00:00:01, Serial0
R 10.1.0.0/16 [120/1] via 192.168.2.1, 00:00:02, Serial1
C 192.168.2.0/24 is directly connected, Serial1
C 192.168.3.0/24 is directly connected, Serial0
再次觀察R2上的路由表與手動彙總之前的不同，顯然手動彙總已經起了作用。
R3上的路由表
R3#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is not set
R 1.0.0.0/8 [120/1] via 192.168.10.1, 00:00:04, Ethernet0
3.0.0.0/24 is subnetted, 1 subnets
C 3.3.3.0 is directly connected, Loopback0
C 192.168.10.0/24 is directly connected, Ethernet0
R 10.0.0.0/8 [120/1] via 192.168.10.1, 00:00:04, Ethernet0
R 192.168.2.0/24 [120/1] via 192.168.3.1, 00:00:13, Serial1
C 192.168.3.0/24 is directly connected, Serial1
實驗總結：
我們通過RIPv2的屬性，來看到VLSM的特徵，我們使用關閉自動彙總的屬性來看到RIPv2的特點，這個實驗希望大家能夠掌握。