三层交换机配置实例 推荐

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今天我配置的实验有两大快，一是三层交换，二是单臂路由，三层交换主要来替换单臂路由，为什么我还要配呢，一些小公司，上网的人多，但又不想买三层设备，所以就要用到单臂路由.



这个拓扑图主要实现以下功能：

配置VTP域,减轻管理员工作量,配置PVST,避免环路的产生，做好DHCP中继，使不同vlan中PC能够动态获取IP地址，设置以太网通道，增加数据流量，三层交换机配置路由功能,使不同vlan 之间的通信，
大体配置和思路如下：

1，IP规划：

3550-1 vlan10 :192.168.1.1 255.255.255.0
3550-1 vlan20 :192.168.2.1 255.255.255.0
3550-1 vlan30 :192.168.3.1 255.255.255.0
3550-1 vlan40 :192.168.4.1 255.255.255.0
3550-2 vlan10 :192.168.1.2 255.255.255.0
3550-2 vlan20 :192.168.2.2 255.255.255.0
3550-2 vlan30 :192.168.3.2 255.255.255.0
3550-2 vlan40 :192.168.4.2 255.255.255.0
3550-2 f0/7 192.168.5.1 255.255.255.0
R1 f0/1 :192.168.5.2 255.255.255.0
R1 f0/2 :192.168.6.1 255.255.255.0
R2 f0/1 :192.168.6.2 255.255.255.0
R2 f0/2.1 :192.168.7.1 255.255.255.0
R2 f0/2.2 :192.168.8.1 255.255.255.0
DHCP :192.168.1.3 255.255.255.0 192.168.1.1
PC1:192.168.2.3 255.255.255.0 192.168.2.1
PC2:192.168.3.3 255.255.255.0 192.168.3.2
PC3:192.168.4.3 255.255.255.0 192.168.4.2
PC4:192.168.7.2 255.255.255.0 192.168.7.1
PC5:192.168.8.2 255.255.255.0 192.168.8.1

2，线缆规划：

SW1的f0/1端口连接3550-1 f0/1端口f0/2端口连接3550-2 f0/1端口f0/3端口连接DHCP服务器，属于Vlan 1;
SW2的f0/1端口连接3550-1 f0/2端口f0/2端口连接3550-2 f0/2端口f0/3端口连接PC1机，属于Vlan 2;
SW3的f0/1端口连接3550-1 f0/3端口f0/2端口连接3550-2 f0/3端口f0/3端口连接PC2机，属于Vlan 3;
SW4的f0/1端口连接3550-1 f0/4端口f0/2端口连接3550-2 f0/4端口f0/3端口连接PC3机，属于Vlan 4;
3550-1 f0/5 端口连接3550-2 f0/5 3550-1 f0/6 端口连接3550-2 f0/6
3550-2 f0/7 端口连接 R1 f0/1 R1 f0/2端口连接 R2 f0/1 R2 f0/2端口连接 SW5 f0/24
SW5 f0/1 端口连接 PC4 SW5 f0/2 端口连接 PC5

3，VTP配置：

VTP 的域名 VTP 的密码 VTP 的修剪 配置两台3550为VTP server 模式 配置其他交换机为client模式

4，STP 配置：

设置3550-1是Vlan1-Vlan2 的生成树根网桥 设置3550-2是Vlan3-Vlan4 的生成树根网桥
在接入层交换机上配置速端口和上行速链路

5，三层交换机的配置：

在其中一台交换机上划分Vlan; 在三层交换机上配置各个Vlan的IP地址，
配置两台三层交换机之间的以太网通道（EthernetChannel）
配置3550-2交换机的路由接口 在三层交换机上配置RIP协议

6，路由器的配置

配置路由器接口的IP地址 配置路由器的RIP协议
在R2上配置单臂路由

7，配置SW5

在SW5上划分Vlan 将PC4；PC5添加进去

好了，规划完了，下面我们开始命令行配置吧：

3550-1的配置如下：

配置交换机的三层路由功能
3550-1#config terminal
3550-1<config>#ip routing // 启用三层路由功能
配置VTP域：
3550-1>enable

3550-1#config terminal

3550-1<config>#vtp domain benet // 创建VTP域
3550-1<config>#vtp password 123 // VTP域的密码
3550-1<config>#vtp pruning // 起用VTP修剪
3550-1<config>#vtp mode server // 配置交换机为vtp server模式
3550-1<config>#exit // 返回下一级
配置VLAN
3550-1#vlan database // 进入vlan数据库
3550-1<vlan>#vlan 10 name vlan10 // 创建vlan 10
3550-1<vlan>#vlan 20 name vlan20 // 创建vlan 20
3550-1<vlan>#vlan 30 name vlan30 // 创建vlan 30
3550-1<vlan>#vlan 40 name vlan40 // 创建vlan 40
3550-1<vlan>#exit
配置vlan IP地址：
3550-1#config terminal
3550-1<config>#interface vlan10
3550-1<config-vlan>#ip address 192.168.1.1 255.255.255.0
3550-1<config-vlan>#exit
3550-1<config>#interface vlan20
3550-1<config-vlan>#ip address 192.168.2.1 255.255.255.0
3550-1<config-vlan>#exit
3550-1<config>#interface vlan30
3550-1<config-vlan>#ip address 192.168.3.1 255.255.255.0
3550-1<config-vlan>#exit
3550-1<config>#interface vlan40
3550-1<config-vlan>#ip address 192.168.4.1 255.255.255.0
3550-1<config-vlan>#exit
配置RIP协议：
3550-1#config terminal
3550-1<config>#ip routing
3550-1<config>#router rip
3550-1<config-router>#network 192.168.1.0

3550-1<config-router>#network 192.168.2.0
3550-1<config-router>#network 192.168.3.0
3550-1<config-router>#network 192.168.4.0
配置PVST:
3550-1<config>#spanning-tree vlan vlan10 root primary //配置vlan10的根网桥
3550-1<config>#spanning-tree vlan vlan20 root primary //配置vlan20的根网桥

3550-1<config>#spanning-tree vlan vlan30 root secondary
3550-1<config>#spanning-tree vlan vlan40 root secondary

3550-1<config>#interface range fastEthernet 0/5 – 6 //进入一定端口
3550-1<config-range>#channel-group 1 mode on //配置以太网通道
配置DHCP中继：
3550-1<config>#interface vlan vlan10
3550-1<config-if>#ip helper-address 192.168.1.3
3550-1<config>#interface vlan vlan20
3550-1<config-if>#ip helper-address 192.168.1.3

3550-2的配置如下：

配置交换机的三层路由功能

3550-2#config terminal
3550-2<config>#ip routing
配置VTP域：

3550-2>enable
3550-2#config terminal
3550-2<config>#vtp domain benet
3550-2<config>#vtp password 123
3550-2<config>#vtp pruning
3550-2<config>#vtp mode server
3550-2<config>#exit
配置vlan IP地址：
3550-2#config terminal
3550-2<config>#interface vlan10
3550-2<config-vlan>#ip address 192.168.1.2 255.255.255.0
3550-2<config-vlan>#exit
3550-2<config>#interface vlan20
3550-2<config-vlan>#ip address 192.168.2.2 255.255.255.0
3550-2<config-vlan>#exit
3550-2<config>#interface vlan30
3550-2<config-vlan>#ip address 192.168.3.2 255.255.255.0
3550-2<config-vlan>#exit
3550-2<config>#interface vlan40
3550-2<config-vlan>#ip address 192.168.4.2 255.255.255.0

3550-2<config>#interface f0/7
3550-2<config-if>#no switchport
3550-2<config-if>#ip address 192.168.5.1 255.255.255.0
3550-2<config-if>#no shotdown
3550-2<config-if>#exit
配置RIP协议：
3550-2#config terminal
3550-2<config>#router rip
3550-1<config-router>#network 192.168.1.0
3550-1<config-router>#network 192.168.2.0
3550-1<config-router>#network 192.168.3.0
3550-1<config-router>#network 192.168.4.0
3550-1<config-router>#network 192.168.5.0
配置PVST:
3550-2<config>#spanning-tree vlan vlan30 root primary
3550-2<config>#spanning-tree vlan vlan40 root primary

3550-2<config>#spanning-tree vlan vlan10 root secondary
3550-2<config>#spanning-tree vlan vlan20 root secondary

3550-2<config>#interface range fastEthernet 0/5 – 6
3550-2<config-if-range>#channel-group 1 mode on
配置DHCP中继：
3550-2<config>#interface vlan vlan30
3550-2<config-if>#ip helper-address 192.168.1.3
3550-2<config>#interface vlan vlan40
3550-2<config-if>#ip helper-address 192.168.1.3

配置交换机：

Sw1#config terminal
Sw1<config>#vtp domain benet
Sw1<config>#vtp password 123
Sw1<config>#vtp mode client
Sw1<config>#vtp pruning
Sw1<config>#interface f0/1
Sw1<config-if>#switchport mode trunk
Sw1<config-if>#exit
Sw1<config>#interface f0/2
Sw1<config-if>#switchport mode trunk
Sw1<config-if>#exit
Sw1<config>#interface f0/3
Sw1<config-if>#switchport access vlan 10
Sw1<config-if>#spanning-tree portfast //端口速链路
Sw1<config-if>#exit
Sw1<config>#spanning-tree uplinkfast //上行速端口

Sw2#config terminal
Sw2<config>#vtp domain benet
Sw2<config>#vtp password 123
Sw2<config>#vtp mode client
Sw1<config>#vtp pruning
Sw2<config>#interface f0/1
Sw2<config-if>#switchport mode trunk
Sw2<config-if>#exit
Sw2<config>#interface f0/2
Sw2<config-if>#switchport mode trunk
Sw2<config-if>#exit
Sw2<config>#interface f0/3
Sw2<config-if>#switchport access vlan 20

Sw2<config-if>#spanning-tree portfast
Sw2<config-if>#exit
Sw2<config>#spanning-tree uplinkfast

Sw3#config terminal
Sw3<config>#vtp domain benet
Sw3<config>#vtp password 123
Sw3<config>#vtp mode client
Sw1<config>#vtp pruning
Sw3<config>#interface f0/1
Sw3<config-if>#switchport mode trunk
Sw3<config-if>#exit
Sw3<config>#interface f0/2
Sw3<config-if>#switchport mode trunk
Sw3<config-if>#exit
Sw3<config>#interface f0/3
Sw3<config-if>#switchport access vlan 30

Sw3<config-if>#spanning-tree portfast
Sw3<config-if>#exit
Sw3<config>#spanning-tree uplinkfast

Sw4#config terminal
Sw4<config>#vtp domain benet
Sw4<config>#vtp password 123
Sw4<config>#vtp mode client
Sw1<config>#vtp pruning
Sw4<config>#interface f0/1
Sw4<config-if>#switchport mode trunk
Sw4<config-if>#exit
Sw4<config>#interface f0/2
Sw4<config-if>#switchport mode trunk
Sw4<config-if>#exit
Sw4<config>#interface f0/3
Sw4<config-if>#switchport access vlan 40

Sw4<config-if>#spanning-tree portfast
Sw4<config-if>#exit
Sw4<config>#spanning-tree uplinkfast

Sw5 >enable
Sw5#config terminal
Sw5<config>#interface f0/24
Sw5<config-if>#switchport mode trunk
Sw5<config-if>#end
Sw5#vlan database
Sw5<vlan>#vlan 10 valn10
Sw5<vlan>#vlan 20 valn20
Sw5<vlan>#exit
Sw5#config terminal
Sw5<config>#interface f0/1
Sw5<config-if>#switchport access vlan10
Sw5<config>#interface f0/2
Sw5<config-if>#switchport access vlan20

路由器的配置：

R1>enable
R1#config terminal
R1<config>#interface f0/1
R1<config-if>#ip address 192.168.5.2 255.255.255.0
R1<config-if>#no shotdown
R1<config>#interface f0/2
R1<config-if>#ip address 192.168.6.1 255.255.255.0
R1<config-if>#no shotdown
R1<config-if>#exit
R1<config>#router rip
R1<config>#network 192.168.5.0
R1<config>#router rip
R1<config>#network 192.168.6.0

R2>enable
R2#config terminal
R2<config>#interface f0/1
R2<config-if>#ip address 192.168.6.2 255.255.255.0
R1<config-if>#no shotdown
R1<config-if>#exit
R1<config>#interface f0/2
R1<config-if>#no shotdown
R1<config-if>#exit
R2<config>#interface f0/2.1
R2<config-subif>#ip address 192.168.7.1 255.255.255.0
R2<config-subif>#encapsolution dot1 10
R2<config>#interface f0/2.2
R2<config-subif>#ip address 192.168.8.1 255.255.255.0
R2<config-subif>#encapsolution dot1 20
R2<config-if>#exit
R2<config>#router rip
R2<config>#network 192.168.6.0
R2<config>#router rip
R2<config>#network 192.168.7.0
R2<config>#router rip
R2<config>#network 192.168.8.0

PC4: IP: 192.168.7.2 mask:255.255.255.0 default-gateway:192.168.7.1

PC5: IP: 192.168.8.2 mask:255.255.255.0 default-gateway:192.168.8.1

实验验收:

在PC1/PC2/PC3/上动态获取DHCP服务器的地址资源
在PC4/PC5上ping PC1/PC2/PC3/和DHCP服务器

排错事使用的命令:

show run //查看所有的配置

show cdp entry * //查看cisco端口连接的设备

show ip router //查看本地路由表

show ip interface brief //查看端口的详细信息

show vlan brief //查看vlan的详细信息

show vtp status //查看VTP配置信息

show ip cef //查看FIB表

show adjacency detail //查看邻接关系表