思科模拟器的单臂路由，交换机，路由器，路由器只要两个端口的话，连接三台电脑该怎么办，划分VLAN，dotlq协议
单臂路由
1. 需求：让三台电脑互通
2. 在二层交换机划分vlan，并加入；
3. 将连接二层交换机和路由器的端口f0/4改为trunk模式
4. 路由器：进入连接路由器的f0/0端口将端口开启
5. 进入每个vlan设dotlq协议并设网络IP（ip address）
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将路由器给网络设网关
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给二层交换机设置VLAN
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记得配不通IP和不同网关（每台电脑都要，维护电脑可不要）具体看图
二层交换机
Switch>en
Switch#conf t
Switch(config)#vlan 10 //创建VLAN
Switch(config-vlan)#vlan 20
Switch(config-vlan)#vlan 30
Switch(config-vlan)#exit
Switch(config)#interface f0/1 //进入f0/1端口
Switch(config-if)#switchport access vlan 10 //将端口加入VLAN10
Switch(config-if)#exit
Switch(config)#interface f0/2 //进入f0/2端口
Switch(config-if)#switchport access vlan 30 //这边是要加入vlan20，不小心加错，下一步重新加入即可
Switch(config-if)#switchport access vlan 20 //将端口加入VLAN20
Switch(config-if)#exit
Switch(config)#interface f0/3 //进入f0/3端口
Switch(config-if)#switchport access vlan 30 //将端口加入VLAN30
Switch(config-if)#exit
Switch(config)#interface f0/4 //进入f0/4端口（可看到是连接路由器和交换机的那个端口
Switch(config-if)#switchport mode trunk //修改为trunk模式
Switch(config-if)#exit
Switch(config)#exit
Switch#
%SYS-5-CONFIG_I: Configured from console by console
Switch#show vlan brief //查看VLAN情况
VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active Fa0/4, Fa0/5, Fa0/6, Fa0/7
Fa0/8, Fa0/9, Fa0/10, Fa0/11
Fa0/12, Fa0/13, Fa0/14, Fa0/15
Fa0/16, Fa0/17, Fa0/18, Fa0/19
Fa0/20, Fa0/21, Fa0/22, Fa0/23
Fa0/24, Gig0/1, Gig0/2
10 VLAN0010 active Fa0/1
20 VLAN0020 active Fa0/2
30 VLAN0030 active Fa0/3
1002 fddi-default active
1003 token-ring-default active
1004 fddinet-default active
1005 trnet-default active 路由器
Would you like to enter the initial configuration dialog? [yes/no]: no
Press RETURN to get started!
Router>en
Router#conf t
Router(config)#interface f0/0 //进入连接路由器的那个端口
Router(config-if)#no shutdown //开启端口
Router(config-if)#
%LINK-5-CHANGED: Interface FastEthernet0/0, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to up
Router(config-if)#exit
Router(config)#interface f0/0.1 //进入子接口
Router(config-subif)#
%LINK-5-CHANGED: Interface FastEthernet0/0.1, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0.1, changed state to up
Router(config-subif)#encapsulation dot1Q 10 //dotlq协议 ，10表示的是vlan 10
Router(config-subif)#ip address 192.168.10.254 255.255.255.0 //ip地址 ip address 网关 子网掩码
Router(config-subif)#exit
Router(config)#interface f0/0.2 //进入子接口
Router(config-subif)#
%LINK-5-CHANGED: Interface FastEthernet0/0.2, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0.2, changed state to up
Router(config-subif)#encapsulation dot1Q 20 //dotlq协议 ，20表示的是vlan 20
Router(config-subif)#ip address 192.168.20.254 255.255.255.0
Router(config-subif)#exit
Router(config)#interface f0/0.3 //进入子接口
Router(config-subif)#
%LINK-5-CHANGED: Interface FastEthernet0/0.3, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0.3, changed state to up
Router(config-subif)#encapsulation dot1Q 30
Router(config-subif)#ip address 192.168.30.254 255.255.255.0
Router(config-subif)#exit
Router(config)#exit
Router#show ip route //查看路由表
Codes: C - connected, S - static, I - IGRP, 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, E - EGP
i - IS-IS, 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
// 看到这个表示基本成功了
C 192.168.10.0/24 is directly connected, FastEthernet0/0.1
C 192.168.20.0/24 is directly connected, FastEthernet0/0.2
C 192.168.30.0/24 is directly connected, FastEthernet0/0.3
Router#