关于子接口DHCP中继思科的问题

Question

我想让4 PC得到DHCP IP地址没有问题与左侧，但右侧2 PC不能获得IP自动化。我想问题是DHCP继电器。如何使用ip助手地址作为R2的子接口？

s1

 interface FastEthernet0/1
   switchport mode trunk
 interface FastEthernet0/2
   switchport access vlan 11
   switchport mode access
 interface FastEthernet0/3
   switchport access vlan 10
   switchport mode access

s2

 interface FastEthernet0/1
   switchport mode trunk
 interface FastEthernet0/2
   switchport access vlan 20
   switchport mode access
 interface FastEthernet0/3
   switchport access vlan 30
   switchport mode access

R1-DHCP

1.建筑物配置..。

Current configuration : 1593 bytes
!
version 15.4
no service timestamps log datetime msec
no service timestamps debug datetime msec
no service password-encryption
!
hostname Router
!
!
!
!
!
ip dhcp pool Area-1
 network 192.168.11.0 255.255.255.0
 default-router 192.168.11.1
ip dhcp pool Area-2
 network 192.168.10.0 255.255.255.0
 default-router 192.168.10.1
ip dhcp pool Area-3
 network 192.168.20.0 255.255.255.0
 default-router 192.168.20.1
ip dhcp pool Area-4
 network 192.168.30.0 255.255.255.0
 default-router 192.168.30.1
!
!
!
ip cef
no ipv6 cef
!
!
!
!
!
!
!
!
!
!
!
!
spanning-tree mode pvst
!
!
!
!
!
!
interface GigabitEthernet0/0/0
 ip address 190.168.50.1 255.255.255.0
 duplex auto
 speed auto
!
interface GigabitEthernet0/0/0.20
 encapsulation dot1Q 20
 ip address 192.168.20.1 255.255.255.0
!
interface GigabitEthernet0/0/0.30
 encapsulation dot1Q 30
 ip address 192.168.30.1 255.255.255.0
!
interface GigabitEthernet0/0/1
 no ip address
 duplex auto
 speed auto
!
interface GigabitEthernet0/0/1.10
 encapsulation dot1Q 10
 ip address 192.168.10.1 255.255.255.0
!
interface GigabitEthernet0/0/1.11
 encapsulation dot1Q 11
 ip address 192.168.11.1 255.255.255.0
!
interface GigabitEthernet0/0/2
 no ip address
 duplex auto
 speed auto
 shutdown
!
interface Vlan1
 no ip address
 shutdown
!
router rip
 version 2
 network 192.168.20.0
 network 192.168.30.0
 network 192.168.50.0
 no auto-summary
!
ip classless
ip route 192.168.20.0 255.255.255.0 192.168.50.2 
ip route 192.168.30.0 255.255.255.0 192.168.50.2 
!
ip flow-export version 9
!
!
!
!
!
!
!
!
line con 0
!
line aux 0
!
line vty 0 4
 login
!
!
!
end

R2

Building configuration...

Current configuration : 1151 bytes
!
version 15.4
no service timestamps log datetime msec
no service timestamps debug datetime msec
no service password-encryption
!
hostname Router
!
!
!
!
!
!
!
!
ip cef
no ipv6 cef
!
!
!
!
!
!
!
!
!
!
!
!
spanning-tree mode pvst
!
!
!
!
!
!
interface GigabitEthernet0/0/0
 ip address 192.168.50.2 255.255.255.0
 ip helper-address 192.168.50.1
 duplex auto
 speed auto
!
interface GigabitEthernet0/0/1
 no ip address
 duplex auto
 speed auto
!
interface GigabitEthernet0/0/1.20
 encapsulation dot1Q 20
 ip address 192.168.20.1 255.255.255.0
 ip helper-address 192.168.50.1
!
interface GigabitEthernet0/0/1.30
 encapsulation dot1Q 30
 ip address 192.168.30.1 255.255.255.0
 ip helper-address 192.168.50.1
!
interface GigabitEthernet0/0/2
 no ip address
 duplex auto
 speed auto
 shutdown
!
interface Vlan1
 no ip address
 shutdown
!
router rip
 version 2
 network 192.168.10.0
 network 192.168.11.0
 network 192.168.50.0
 no auto-summary
!
ip classless
ip route 192.168.10.0 255.255.255.0 192.168.50.1 
ip route 192.168.11.0 255.255.255.0 192.168.50.1 
!
ip flow-export version 9

Answer 1

一些问题：

• ip helper-address 192.168.50.2 --您已经将路由器本身添加为DHCP服务器。那条线得走了。
• 没有为VLAN 30设置DHCP中继。
• 为每个路由器上的远程网络添加静态路由。实际上，每个路由器只看到立即连接的网络。由于缺乏路由，其他网络的数据包被丢弃。
• 目前，您已经在R1/Gig0.0.0 (面向R2)上为VLAN 20和30提供了子接口。这是无法工作的，因为在整个L2中没有R2连接。同时，DHCP中继不能工作(表面上)直接连接的IP子网；路由也不能正常工作。您需要删除这些子接口。

Answer 2

这应该通过R2进行配置。

ip dhcp pool Area-3
 network 192.168.20.0 255.255.255.0
 default-router 192.168.20.1
ip dhcp pool Area-4
 network 192.168.30.0 255.255.255.0
 default-router 192.168.30.1