原理

    VLAN（虚拟局域网）是对连接到的第二层交换机端口的网络用户的逻辑分段，不受网络用户的物理位置限制而根据用户需求进行网络分段。一个VLAN可以在一个交换机或者跨交换机实现。VLAN可以根据网络用户的位置、作用、部门或者根据网络用户所使用的应用程序和协议来进行分组。基于交换机的虚拟局域网能够为局域网解决冲突域、广播域、带宽问题。

适用范围：

    按规定规划vlan

方案

拓扑图

实验步骤

1.客户端与交换机相连

    分别给6台电脑配置ip地址从左到右分别为192.168.1.1、192.169.1.2;192.168.2.1、192.168.2.2;192.168.3.1、192.168.3.2

2.在交换机上创建vlan2 和vlan3并将指定的接口划分到相对应的vlan下

Switch >enable

Switch#configure terminal

Switch(config)#vlan 2

Switch(config-vlan)#exit

Switch(config)#vlan 3

Switch(config-vlan)#exit

Switch(config)#interface fastEthernet 0/3

Switch(config-if)#switchport access vlan 2

Switch(config-if)#exit

Switch(config)#interface fastEthernet 0/4

Switch(config-if)#switchport access vlan 2

Switch(config-if)#exit

Switch(config)#interface fastEthernet 0/5

Switch(config-if)#switchport access vlan 3

Switch(config-if)#exit

Switch(config)#interface fastEthernet 0/6

Switch(config-if)#switchport access vlan 3

3.在交换机上查看vlan信息，可以看到创建的vlan以及vlan下的接口

Switch>enable

Switch#show vlan

VLAN Name Status Ports

---- -------------------------------- --------- -------------------------------

1 default active Fa0/1, Fa0/2, 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

2 VLAN0002 active Fa0/3, Fa0/4

3 VLAN0003 active Fa0/5, Fa0/6

1002 fddi-default act/unsup

1003 token-ring-default act/unsup

1004 fddinet-default act/unsup

1005 trnet-default act/unsup

VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2

---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------

1 enet 100001 1500 - - - - - 0 0

2 enet 100002 1500 - - - - - 0 0

3 enet 100003 1500 - - - - - 0 0

1002 fddi 101002 1500 - - - - - 0 0

1003 tr 101003 1500 - - - - - 0 0

1004 fdnet 101004 1500 - - - ieee - 0 0

1005 trnet 101005 1500 - - - ibm - 0 0

Remote SPAN VLANs

------------------------------------------------------------------------------

Primary Secondary Type Ports

------- --------- ----------------- ------------------------------------------

4.在客户端测试网络的连通性

在192.168.1.0/24的客户机上测试1.0网段的连通性

PC1>ping 192.168.1.2

Pinging 192.168.1.2 with 32 bytes of data:

Reply from 192.168.1.2: bytes=32 time=11ms TTL=128

Reply from 192.168.1.2: bytes=32 time=1ms TTL=128

Reply from 192.168.1.2: bytes=32 time=1ms TTL=128

Reply from 192.168.1.2: bytes=32 time=4ms TTL=128

Ping statistics for 192.168.1.2:

Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),

Approximate round trip times in milli-seconds:

Minimum = 1ms, Maximum = 11ms, Average = 4ms

在192.168.2.0/24的客户机上测试2.0网段的连通性

PC>ping 192.168.2.2

Pinging 192.168.2.2 with 32 bytes of data:

Reply from 192.168.2.2: bytes=32 time=1ms TTL=128

Reply from 192.168.2.2: bytes=32 time=0ms TTL=128

Reply from 192.168.2.2: bytes=32 time=0ms TTL=128

Reply from 192.168.2.2: bytes=32 time=0ms TTL=128

Ping statistics for 192.168.2.2:

Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),

Approximate round trip times in milli-seconds:

Minimum = 0ms, Maximum = 1ms, Average = 0ms

在192.168.3.0/24的客户机上测试3.0网段的连通性

PC>ping 192.168.3.2

Pinging 192.168.3.2 with 32 bytes of data:

Reply from 192.168.3.2: bytes=32 time=1ms TTL=128

Reply from 192.168.3.2: bytes=32 time=0ms TTL=128

Reply from 192.168.3.2: bytes=32 time=0ms TTL=128

Reply from 192.168.3.2: bytes=32 time=1ms TTL=128

Ping statistics for 192.168.3.2:

Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),

Approximate round trip times in milli-seconds:

Minimum = 0ms, Maximum = 1ms, Average = 0ms