（2）SW3的配置<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

SW3#vlan database

SW3(vlan)#vlan 10

SW3(vlan)#vlan 11

SW3(vlan)#vlan 12

SW3(vlan)#vlan 8

SW3(vlan)#exit

SW3#config terminal

SW3(config)#interface fastethernet0/10

SW3(config-if)#switchport mode access

SW3(config-if)#switchport access vlan 10

SW3(config-if)#exit

SW3(config)#interface fastethernet0/11

SW3(config-if)#switchport mode access

SW3(config-if)#switchport access vlan 11

SW3(config-if)#exit

SW3(config)#interface fastethernet0/1

SW3(config-if)#switchport trunk encapsulation dot1Q

SW3(config-if)#switchport mode trunk

SW3(config-if)#switchport trunk allowed vlan all

SW3(config-if)#exit

SW3(config)#interface vlan 8

SW3(config-if)#ip adde

SW3(config-if)#ip address 192.168.8.130 255.255.255.128

SW3(config-if)#no shutdown

SW3(config-if)#exit

SW3(config)#ip default-gateway 192.168.8.129

SW3(config)#do show ip interface brief

Interface       IP-Address      OK? Method Status              Prot

FastEthernet0/   unassigned      YES unset  up                  down   

FastEthernet0/1  unassigned      YES unset  up                  up

FastEthernet0/10 unassigned      YES unset  up                  up     

FastEthernet0/11   unassigned      YES unset  up                up

Vlan1            unassigned      YES NVRAM  up                  up     

Vlan8            192.168.8.130   YES manual up                  up 

   

SW3(config)#do show interface trunk

Port      Mode         Encapsulation  Status        Native vlan

Fa0/1     on           802.1q         trunking      1

Port      Vlans allowed on trunk

Fa0/1     1-1005

Port      Vlans allowed and active in management domain

Fa0/1     1,8,10-12

Port      Vlans in spanning tree forwarding state and not pruned

Fa0/1     1,8,10-12   

Fa0/1     1,8,10-12

SW3(config)#do show vlan-switch brief

 

VLAN Name                             Status    Ports

1    default                          active    Fa0/0, Fa0/2, Fa0/3, Fa0/4

                                                Fa0/5, Fa0/6, Fa0/7, Fa0/8

                                                Fa0/9, Fa0/12, Fa0/13, Fa0/14

                                                Fa0/15

8    wg                               active   

10   sc                               active    Fa0/10

11   bg                               active    Fa0/11

(3) SW4的配置

SW4#vlan database

SW4(vlan)#vlan 8

SW4(vlan)#vlan 10

SW4(vlan)#vlan 11

SW4(vlan)#vlan 12

SW4(vlan)#exit

APPLY completed.

Exiting....

SW4#config terminal

SW4(config)#interface fastethernet0/10

SW4(config-if)#switchport mode access

SW4(config-if)#switchport access vlan 10

SW4(config-if)#exit    

SW4(config)#interface fastethernet0/11

SW4(config-if)#switchport mode access

SW4(config-if)#switchport access vlan 11

SW4(config-if)#exit

SW4(config)#interface fastethernet0/1

SW4(config-if)#switchport trunk encapsulation dot1Q

SW4(config-if)#switchport mode trunk

SW4(config-if)#switchport trunk allowed vlan all

SW4(config-if)#exit

SW4(config)#interface vlan 8

SW4(config-if)#ip address 192.168.8.131 255.255.255.128

SW4(config-if)#exit

SW4(config)#ip default-gateway 192.168.8.129

SW4(config)#do show ip interface brief

Interface     IP-Address      OK? Method Status                Pro

 

FastEthernet0/1   unassigned      YES unset  up                    up

FastEthernet0/10  unassigned      YES unset  up                    up     

FastEthernet0/11  unassigned      YES unset  up                    up     

Vlan1             unassigned      YES NVRAM  up                    up     

Vlan8             192.168.8.131   YES manual up                    up

SW4(config)#do show interface trunk

Port      Mode         Encapsulation  Status        Native vlan

Fa0/1     on           802.1q         trunking      1

 

Port      Vlans allowed on trunk

Fa0/1     1-1005

 

Port      Vlans allowed and active in management domain

Fa0/1     1,8,10-12

 

Port      Vlans in spanning tree forwarding state and not pruned

Fa0/1     1,8,10-12

Fa0/1     1,8,10-12

SW4(config)#do show vlan-s

VLAN Name                             Status    Ports

1    default                          active    Fa0/0, Fa0/2, Fa0/3, Fa0/4

                                                Fa0/5, Fa0/6, Fa0/7, Fa0/8

                                                Fa0/9, Fa0/12, Fa0/13, Fa0/14

                                                Fa0/15

8    wg                               active   

10   sc                               active    Fa0/10

11   bg                               active    Fa0/11

（4）RT5的配置

RT5(config)#interface ethernet0/0

RT5(config-if)#ip address 192.168.12.200 255.255.255.0

RT5(config-if)#no shutdown

RT5(config-if)#exit

RT5(config)#ip route <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" />0.0.0.0 0.0.0.0 192.168.12.1

//全网连通性必须要配置默认表态路由

RT5(config)#do show ip interface brief

Interface                  IP-Address      OK? Method Status                Protocol

Ethernet0/0                192.168.12.200  YES manual up                    up     

Ethernet0/1                unassigned      YES unset  administratively down down

RT5(config)#do 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 192.168.12.1 to network 0.0.0.0

 

C    192.168.12.0/24 is directly connected, Ethernet0/0

S*   0.0.0.0/0 [1/0] via 192.168.12.1

(5)以SW1为DHCP服务器的配置

SW1(config)#service dhcp

SW1(config)#ip dhcp pool vlan10

SW1(dhcp-config)#network 192.168.10.0 255.255.255.0

SW1(dhcp-config)#default-router 192.168.10.1

SW1(dhcp-config)#exit

SW1(config)#ip dhcp excluded-address 192.168.10.100 192.168.10.254

SW1(config)#ip dhcp pool vlan11

SW1(dhcp-config)#network 192.168.11.0 255.255.255.0

SW1(dhcp-config)#default-router 192.168.11.1

SW1(dhcp-config)#exit

SW1(config)#ip dhcp excluded-address 192.168.11.100 192.168.11.254

（6）以SW1为DHCP中继的配置

首先要删除SW1上的DHCP服务

SW1(config)#no ip dhcp pool vlan10

SW1(config)#no ip dhcp pool vlan11

SW1(config)#no ip dhcp excluded-address 192.168.11.100 192.168.11.254

SW1(config)#no ip dhcp excluded-address 192.168.10.100 192.168.10.254

 

再配置中继

SW1(config)#serice dhcp

SW1(config)#ip dhcp relay information option

SW1(config)#interface vlan 10

SW1(config-if)#ip helper-address 192.168.12.200

SW1(config-if)#exit

SW1(config)#interface vlan 11

SW1(config-if)#ip helper-address 192.168.12.200

SW1(config-if)#exit

 

然后在RT5上配置地址池等信息

RT5(config)#service dhcp

RT5 (config)#ip dhcp pool vlan10

RT5 (dhcp-config)#network 192.168.10.0 255.255.255.0

RT5 (dhcp-config)#default-router 192.168.10.1

RT5 (dhcp-config)#exit

RT5 (config)#ip dhcp excluded-address 192.168.10.1 192.168.10.150

RT5 (config)#ip dhcp pool vlan11

RT5 (dhcp-config)#network 192.168.11.0 255.255.255.0

RT5 (dhcp-config)#default-router 192.168.11.1

RT5 (dhcp-config)#exit

RT5 (config)#ip dhcp excluded-address 192.168.11.1 192.168.11.150

 

一、  测试结果

PC3从DHCP中继获取的IP及连通性如下图：

<?xml:namespace prefix = v ns = "urn:schemas-microsoft-com:vml" />

此图表明从DHCP中继获取IP成功及能全网互通。

PC2从DHCP中继获取的IP及连通性如下图：

此图表明从DHCP中继获取IP成功及能全网互通。

 

全网连通性测试

        设备   

SW1
PC1
PC4
SW3
SW4
RT5

192.168.10.1
√
√
√
√
√
√

192.168.10.100
√
√
√
√
√
√

192.168.11.1
√
√
√
√
√
√

192.168.11.100
√
√
√
√
√
√

192.168.12.1
√
√
√
√
√
√

192.168.12.100
√
√
√
√
√
√

192.168.8.129
√
√
√
√
√
√

192.168.8.130
√
√
√
√
√
√

192.168.8.131
√
√
√
√
√
√

 

二、  遇到的问题及思考题

第一次测试的时候发现PC1可以Ping通SW1，无法Ping通RT5，然后发现原因是在配置RT5的时候忘记配置一个静态路由，使得RT5虽然可以接收到数据，但是无法给出回复，配置了静态路由ip route0.0.0.0 0.0.0.0 192.168.12.1

思考：二层交换机的网管地址的作用

      路由表，ARP表和MAC表有什么区别

      思考PC1到PC2的数据流过程

      什么组网情况下需要部署DHCP中继

 

三、  实验心得

这个三层交换与DHCP中继的实验，让我更熟练地掌握了端口的配置命令及配置情况。并且让我了解了基本的随机分配IP地址的配置命令。在过程中遇到了问题，在同学和老师的指导下，知道了如何查出问题，并认识到了对数据流进行仔细分析的重要性和必要性。