三层交换与DHCP中继2

实验拓朴:

 

 

 

 

 

拓朴说明:

 

此拓朴是用一台路由器做DHCP SERVER ,给所有客户端分配IP地址.

 

实验目的:

 

 

能够让VLAN 2 中的PC 机通过三层交换机上的DHCP 中继功能从VLAN 3 中的路由器上的DHCP SERVER 中得到IP 地址

 

 

实验步骤:

 

 

1.搭环境.

 

Switch1 F0/15   <---->   Switch2 F0/15
Switch2 F0/3    < ---->   Router1 E0/1    (vlan 3)
Switch2 F0/2     <---->   XPC P0/0          (vlan 2，net1)

 

2.  在SW1-3 和 SW2-2 中打开F0/15为中继端口（TRUNK.略）

 

3.  在SW1-3 和 SW2-2 上做VTP，并且，新建VLAN 2，3（略）

 

    SW1-3为VTP  SERVER，并新建VLAN 2 ，3。2
    SW2-2为VTP  CLIENT。
     
4.  在SW1-3和SW2-2中分别测试VLAN是否OK！ （略）
      
5.   SW2-2中划接口F0/2到VLAN 2，划接口F0/3到VLAN 3。

 

sw2-2#conf t                           （划分接口到VLAN中）
Enter configuration commands, one per line.  End with CNTL/Z.
sw2-2(config)#interface f0/2
sw2-2(config-if)#switchport access vlan 2
sw2-2(config-if)#switchport mode access        （定义为二层接口）
sw2-2(config-if)#no sh
sw2-2(config-if)#exit

sw2-2(config)#interface f0/3
sw2-2(config-if)#switchport access vlan 3
sw2-2(config-if)#switchport mode access
sw2-2(config-if)#no sh
sw2-2(config-if)#exit
sw2-2(config)#exit
sw2-2#

6．sw2-2#show vlan-switch         ( test)

VLAN Name                             Status    Ports
---- -------------------------------- --------- -------------------------------
1    default                          active    Fa0/0, Fa0/1, Fa0/4, Fa0/5
                                                Fa0/6, Fa0/7, Fa0/8, Fa0/9
                                                Fa0/10, Fa0/11, Fa0/12, Fa0/13
                                                Fa0/14
2    v2                               active    Fa0/2
3    v3                               active    Fa0/3
1002 fddi-default                     active   
1003 trcrf-default                    active   
1004 fddinet-default                  active   
1005 trbrf-default                    active   

6．sw1-3(config)#ip  routing          开启三层交换机的路由功能.
    
7．sw1-3(config)#interface vlan 3
sw1-3(config-if)#ip add 192.168.3.254 255.255.255.0
sw1-3(config-if)#no sh
sw1-3(config-if)#exit
    
sw1-3(config)#interface vlan 2
sw1-3(config-if)#ip add 192.168.2.254 255.255.255.0
sw1-3(config-if)#no sh
 

8．sw1-3#show ip in br
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0/0            unassigned      YES unset  up                    down   
FastEthernet0/1            unassigned      YES unset  up                    down   
FastEthernet0/2            unassigned      YES unset  up                    down   
FastEthernet0/3            unassigned      YES unset  up                    down   
FastEthernet0/4            unassigned      YES unset  up                    down   
FastEthernet0/5            unassigned      YES unset  up                    down   
FastEthernet0/6            unassigned      YES unset  up                    down   
FastEthernet0/7            unassigned      YES unset  up                    down   
FastEthernet0/8            unassigned      YES unset  up                    down   
FastEthernet0/9            unassigned      YES unset  up                    down   
FastEthernet0/10           unassigned      YES unset  up                    down   
FastEthernet0/11           unassigned      YES unset  up                    down   
FastEthernet0/12           unassigned      YES unset  up                    down   
FastEthernet0/13           unassigned      YES unset  up                    down   
FastEthernet0/14           unassigned      YES unset  up                    down   
FastEthernet0/15           unassigned      YES unset  up                    up     
Vlan1                      unassigned      YES unset  up                    up     
Vlan2                      192.168.2.254   YES manual up                    up     
Vlan3                      192.168.3.254   YES manual up                    up

9．  sw1-3#show ip route
Codes: C - connected, S - static, 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
       i - IS-IS, su - IS-IS summary, 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

C    192.168.2.0/24 is directly connected, Vlan2
C    192.168.3.0/24 is directly connected, Vlan3

10．R1(config)#interface e0/1
R1(config-if)#ip add 192.168.3.1 255.255.255.0
R1(config-if)#no sh

11．sw1-3#conf t         
Enter configuration commands, one per line.  End with CNTL/Z.
sw1-3(config)#router rip
sw1-3(config-router)#network 192.168.2.0
sw1-3(config-router)#network 192.168.3.0
sw1-3(config-router)#exit
sw1-3(config)#exi

12．Router #show ip route
Codes: C - connected, S - static, 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
       i - IS-IS, su - IS-IS summary, 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

C    192.168.3.0/24 is directly connected, Ethernet0/0   

 

r1#ping 192.168.2.1

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.2.1, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)

 

13.  R1(config)#router rip                      （R1运行RIP）
R1(config-router)#network 192.168.3.0
R1(config-router)#exit
R1(config)#exit

 

14．r1#show ip route
Codes: C - connected, S - static, 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
       i - IS-IS, su - IS-IS summary, 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    192.168.2.0/24 [120/1] via 192.168.3.254, 00:00:14, Ethernet0/0    
C    192.168.3.0/24 is directly connected, Ethernet0/0

 

r1#ping 192.168.2.1 

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.2.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 32/62/104 ms

 

15． R1 上面做DHCP SERVER。
Router#conf t
Router(config)# ip dhcp pool 192.168.2.0  
Router(dhcp-config)# network 192.168.2.0 255.255.255.0
Router(dhcp-config)# default-router 192.168.2.254
Router(dhcp-config)# dns-server 202.96.128.166 192.168.2.254

 

16.测试没有配置中继之前,客户机能否得到IP 地址.

 

失败.

 

 

17.在三层交换机上配置中继代理.

 

sw1-3#conf t

Enter configuration commands, one per line.  End with CNTL/Z.

sw1-3(config)#interface vlan 2

sw1-3(config-if)#ip helper-address 192.168.3.1        { 中继 }

sw1-3(config)#exit

sw1-3#

 

18.测试中继的配置是否正确.

 

VLAN2中的PC机,向VLAN3中的,以路由器做的DHCP SERVER申请IP地址.

 

配置完成.如有问题,请你多指教.

 

谢谢

michaelfung.

 

 

 

 

 

 

 

 

 

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