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GNS3 单臂路由+DHCP

2013-03-27 19:06:14| 分类： GNS3 | 标签： |举报 |字号大中小订阅

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在GNS3中使用C3660加上三层路由来实现单臂路由和DHCP的功能，进入正题。

网络拓扑图如图1所示,R1是路由器，R3是三层交换机：

图1 网络拓扑图

首先，对R1进行单臂路由的配置：

R1#conf t   
Enter configuration commands, one per line.  End with CNTL/Z.
R1(config)#in fa0/0
R1(config-if)#no ip add
R1(config-if)#no shut
R1(config-if)#exit
R1(config)#
R1(config)#int fa0/0.1
R1(config-subif)#encap dot1q 10
R1(config-subif)#ip add 192.168.10.1 255.255.255.0
R1(config-subif)#no shut
R1(config-subif)#int fa0/0.2
R1(config-subif)#encap dot1q 20
R1(config-subif)#ip add 192.168.20.1 255.255.255.0 
R1(config-subif)#no shu
R1(config-subif)#no shut
R1(config-subif)#exit
R1(config)#exit

配置成功的显示：

R1#show ip int brief
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 unassigned YES manual up up
FastEthernet0/0.1 192.168.10.1 YES manual up up
FastEthernet0/0.2 192.168.20.1 YES manual up up
FastEthernet0/1 unassigned YES unset administratively down down

然后，对R1进行DHCP配置：

R1(config)#ip dhcp pool vlan10
R1(dhcp-config)#network 192.168.10.0 255.255.255.0
R1(dhcp-config)#default-router 192.168.10.1
R1(dhcp-config)#dns-server 192.168.10.1
R1(dhcp-config)#domain-name test1.com
R1(dhcp-config)#exit
R1(config)#ip dhcp excluded-address 192.168.10.1 192.168.10.10
R1(config)#ip dhcp pool vlan20 
R1(dhcp-config)#network 192.168.20.0 255.255.255.0
R1(dhcp-config)#default-router 192.168.20.1
R1(dhcp-config)#dns-server 192.168.20.1
R1(dhcp-config)#domain-name test2.com
R1(dhcp-config)#exit
R1(config)#exit
R1#

配置成功后，可以使用show ip dhcp pool指令来查询配置：

R1#show ip dhcp pool

Pool vlan10 :
Utilization mark (high/low) : 100 / 0
Subnet size (first/next) : 0 / 0
Total addresses : 254
Leased addresses : 0
Pending event : none
1 subnet is currently in the pool :
Current index IP address range Leased addresses
192.168.10.1 192.168.10.1 - 192.168.10.254 0

Pool vlan20 :
Utilization mark (high/low) : 100 / 0
Subnet size (first/next) : 0 / 0
Total addresses : 254
Leased addresses : 0
Pending event : none
1 subnet is currently in the pool :
Current index IP address range Leased addresses
192.168.20.1 192.168.20.1 - 192.168.20.254 0

接着，对R3进行配置，划分出两个VLAN——VLAN 10和VLAN 20，分别对应上面的fa0/0.1和fa0/0.2，配置如下：

a.先对fa1/0端口进行设置，将其设置成trunk模式：

R3#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
R3(config)#int fa1/0
R3(config-if)#switchport mode trunk
R3(config-if)#no shut
R3(config-if)#exit
R3(config)#exit  
R3#

b.建立两个VLAN：

R3(vlan)#vlan 10
VLAN 10 added:
    Name: VLAN0010
R3(vlan)#vlan 20
VLAN 20 added:
    Name: VLAN0020
R3(vlan)#exit

c.将C1、C2分别划入到不同的VLAN中：

R3(config)#int fa1/1
R3(config-if)#shutdown
R3(config-if)#switchport mode access
R3(config-if)#no shut      
R3(config-if)#switchport access vlan 10
R3(config-if)#exit
R3(config)#int fa1/2
R3(config-if)#shutdown
R3(config-if)#switchport mode access
R3(config-if)#no shut      
R3(config-if)#switchport access vlan 20
R3(config-if)#exit

最后，在VPCS中，分别测试，结果如图，IP成功自动分配：

图2 IP自动分配

两台PC之间也能相互ping通，如图3所示：

图3 PC间相互ping通

PS：在三层交换机中，有时候端口是处于开启状态的，但是协议却是关闭着的，这时候，DHCP是不能成功分配IP给PC的（其他配置正确）；需要先将整个端口关闭，然后再重新打开，这时，会显示端口和协议都处于开启状态。

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