【實驗名稱】
VLAN/802.1Q-VLAN間的通信
【實驗目的】
通過三層交換機實現VLAN間互相通信
【實驗功能】
使在同一VLAN裏的計算機系統能跨交換機進行相互通信，而在不同VLAN裏的計算機系統也能進行相互通信
【實驗設備】
三層交換機（1臺）、普通可網管交換機（1臺）、直連線（3條）
【實驗拓撲】
【實驗步驟】
三層交換機：3Switch1
Switch>enable
Switch#configure terminal
Switch(config)#vlan 10
Switch(config-vlan)#exit
Switch(config)#vlan 20
Switch(config-vlan)#exit
Switch(config)#interface fastEthernet 0/5
Switch(config-if)#switchport access vlan 10
Switch(config-if)#exit
Switch(config)#interface fastEthernet 0/15
Switch(config-if)#switchport access vlan 20
Switch(config-if)#exit
Switch(config)#interface fastEthernet 0/24
Switch(config-if)#switchport mode trunk
二層交換機：Switch1
Switch>enable
Switch#configure terminal
Switch(config)#vlan 10
Switch(config-vlan)#exit
Switch(config)#interface fastEthernet 0/5
Switch(config-if)#switchport access vlan 10
Switch(config)#interface fastEthernet 0/24
Switch(config-if)#switchport mode trunk
現在我們把192.168.10.1 、192.168.10.2分別給VLAN10 裏的2個PC
192.168.10.3 給VLAN 20的 PC
此時發現
PC>ping 192.168.10.2
Pinging 192.168.10.2 with 32 bytes of data:
Reply from 192.168.10.2: bytes=32 time=93ms TTL=128
Reply from 192.168.10.2: bytes=32 time=78ms TTL=128
Reply from 192.168.10.2: bytes=32 time=93ms TTL=128
Reply from 192.168.10.2: bytes=32 time=94ms TTL=128
Ping statistics for 192.168.10.2:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 78ms, Maximum = 94ms, Average = 89ms
PC>ping 192.168.10.3
Pinging 192.168.10.3 with 32 bytes of data:
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Ping statistics for 192.168.10.3:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),
相同VLAN可以通信 不同VLAN 不可通信！
本章節關鍵就在這裏！
繼續在三層交換機配置
Switch(config)#interface vlan 10 （進入虛擬VLAN接口）
Switch(config-if)#no shutdown
Switch(config-if)#ip address 192.168.10.254 255.255.255.0 （配置IP地址 即VLAN10網關）
Switch(config-if)#exit
Switch(config)#interface vlan 20
Switch(config-if)#no shutdown
Switch(config-if)#ip address 192.168.20.254 255.255.255.0
這時把VLAN20的PC IP改成192.168.20.1 因爲要和網關一個網段 （開始配置是爲了證明不通VLAN 就算一個網段IP亦不可通）
VLAN10 的PC 網關改爲192.168.10.254 VLAN 20PC網關 192.168.20.254
此時：
PC>ping 192.168.10.1
Pinging 192.168.10.1 with 32 bytes of data:
Reply from 192.168.10.1: bytes=32 time=62ms TTL=127
Reply from 192.168.10.1: bytes=32 time=63ms TTL=127
Reply from 192.168.10.1: bytes=32 time=31ms TTL=127
Reply from 192.168.10.1: bytes=32 time=62ms TTL=127
Ping statistics for 192.168.10.1:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 31ms, Maximum = 63ms, Average = 54ms
PC>ping 192.168.10.2
Pinging 192.168.10.2 with 32 bytes of data:
Reply from 192.168.10.2: bytes=32 time=94ms TTL=127
Reply from 192.168.10.2: bytes=32 time=93ms TTL=127
Reply from 192.168.10.2: bytes=32 time=78ms TTL=127
Reply from 192.168.10.2: bytes=32 time=94ms TTL=127
Ping statistics for 192.168.10.2:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 78ms, Maximum = 94ms, Average = 89ms
全網互通！
原創：胡斌
我會從簡單到難的發表一些我學過的知識，希望能給一些想入門的朋友幫助，也希望找一些志同道合的朋友、老師 給我些指教。 QQ 276200261！