rip中的连续子网以及不连续子网

RIPv1	RIPv2
距离矢量2	距离矢量
最大跳计数15	最大跳计数15
有类的	无类的
基于广播的	基于组播224.0.09
不支持VLSM	支持VLSM
无认证	允许MD5认证
不支持不连续子网	支持不连续子网

下面我们来认识一下什么叫做有类以及无类，有类就是A类，B类，C类，D类网络，没有划分子网。无类就是划分了子网。

我们通过一个例子来说明，比如A类的地址1.1.1.1 子网掩码 255.255.255.0 这是子网，则它的有类网络是1.0.0.0 ，掩码255.0.0.0.无类网络就是1.1.1.0，掩码255.255.255.0.

不连续的子网？

什么叫做不连续的子网呢，不连续的子网就是，中间有其它网络来分开。比如下面该图所显示一样

在rip v1 关闭自动汇总，还是不能学习到172.16.10.1 和172.16.20.1的网络。

R7

!
interface Loopback0
 ip address 172.16.10.1 255.255.255.0
!
interface GigabitEthernet0/0
 ip address 192.168.1.1 255.255.255.0
 duplex auto
 speed auto
!
interface GigabitEthernet0/1
 no ip address
 duplex auto
 speed auto
 shutdown
!
interface GigabitEthernet0/2
 no ip address
 duplex auto
 speed auto
 shutdown
!
interface Vlan1
 no ip address
 shutdown
!
router rip
 network 172.16.0.0
 network 192.168.1.0
 no auto-summary
!
ip classless
!
ip flow-export version 9
!
!
!
!
!
!
!
line con 0
!
line aux 0
!
line vty 0 4
 login
!
!
!

　R6

ip cef
no ipv6 cef
!
!
!
!
license udi pid CISCO2911/K9 sn FTX1524JN31
!
!
!
!
!
!
!
!
!
!
!
spanning-tree mode pvst
!
!
!
!
!
!
interface Loopback0
 ip address 1.1.1.1 255.255.255.0
!
interface GigabitEthernet0/
 ip address 192.168.1.2 255.255.255.0
 duplex auto
 speed auto
!
interface GigabitEthernet0/
 ip address 192.168.2.1 255.255.255.0
 duplex auto
 speed auto
!
interface GigabitEthernet0/
 no ip address
 duplex auto
 speed auto
 shutdown
!
interface Vlan1
 no ip address
 shutdown
!
router rip
 network 1.0.0.0
 network 192.168.1.0
 network 192.168.2.0
 no auto-summary
!
ip classless
!
ip flow-export version
!
!
!
!
!
!
!
line con
!
line aux
!
line vty
 login
!
!
!
end

R8

hostname Router
!
!
!
!
!
!
!
!
ip cef
no ipv6 cef
!
!
!
!
license udi pid CISCO2911/K9 sn FTX1524CD62
!
!
!
!
!
!
!
!
!
!
!
spanning-tree mode pvst
!
!
!
!
!
!
interface Loopback0
 ip address 172.16.30.1 255.255.255.0
!
interface GigabitEthernet0/
 no ip address
 duplex auto
 speed auto
 shutdown
!
interface GigabitEthernet0/
 ip address 192.168.2.2 255.255.255.0
 duplex auto
 speed auto
!
interface GigabitEthernet0/
 no ip address
 duplex auto
 speed auto
 shutdown
!
interface Vlan1
 no ip address
 shutdown
!
router rip
 network 172.16.0.0
 network 192.168.2.0
 no auto-summary
!
ip classless
!
ip flow-export version
!
!
!
!
!
!
!
line con
!
line aux
!
line vty
 login
!

使用RIPv2 之后就可以支持不连续子网，这时候就能够学习到两边172.16.0.0 的子网了。

变为RIP v2的配置

R7

interface Loopback0
 ip address 172.16.10.1 255.255.255.0
!
interface GigabitEthernet0/
 ip address 192.168.1.1 255.255.255.0
 duplex auto
 speed auto
!
interface GigabitEthernet0/
 no ip address
 duplex auto
 speed auto
 shutdown
!
interface GigabitEthernet0/
 no ip address
 duplex auto
 speed auto
 shutdown
!
interface Vlan1
 no ip address
 shutdown
!
router rip
 version
 network 172.16.0.0
 network 192.168.1.0
 no auto-summary
!
ip classless
!
ip flow-export version
!
!
!
!
!
!
!
line con
!
line aux
!
line vty
 login
!
!
!
end

R6

interface Loopback0
 ip address 1.1.1.1 255.255.255.0
!
interface GigabitEthernet0/
 ip address 192.168.1.2 255.255.255.0
 duplex auto
 speed auto
!
interface GigabitEthernet0/
 ip address 192.168.2.1 255.255.255.0
 duplex auto
 speed auto
!
interface GigabitEthernet0/
 no ip address
 duplex auto
 speed auto
 shutdown
!
interface Vlan1
 no ip address
 shutdown
!
router rip
 version
 network 1.0.0.0
 network 192.168.1.0
 network 192.168.2.0
 no auto-summary
!
ip classless
!
ip flow-export version
!
!
!
!
!
!
!
line con
!
line aux
!

R8

interface Loopback0
 ip address 172.16.30.1 255.255.255.0
!
interface GigabitEthernet0/
 no ip address
 duplex auto
 speed auto
 shutdown
!
interface GigabitEthernet0/
 ip address 192.168.2.2 255.255.255.0
 duplex auto
 speed auto
!
interface GigabitEthernet0/
 no ip address
 duplex auto
 speed auto
 shutdown
!
interface Vlan1
 no ip address
 shutdown
!
router rip
 version
 network 172.16.0.0
 network 192.168.2.0
 no auto-summary
!
ip classless
!
ip flow-export version
!
!
!
!
!
!
!
line con 

这时候你再查看路由表就可以看到所有路由都能学习到了。