這是我做實驗的時候簡單架構的一個top圖。我將s1作為核心交換機，s2和s3作為接入層的交換機進行配置。

在這次實驗當中接入層的每臺交換機接入兩臺pc，分別連入交換機的fa0/1 和fa0/2。但是，兩個口分入不同的vlan，來測試trunk。

vlan2的ip是192.168.1.1/24

vlan3的ip是192.168.2.1/24

下面是三臺交換機的vlan配置：

1）首先是s1交換機

en
conf t
int gi1/1
sw mode trunk
int gi1/2
sw mode trunk
exit

2）s2的配置

en
conf t
int gi1/1
sw mode trunk
exit
vlan 2
name office
exit
int vlan 2
ip add 192.168.1.1 255.255.255.0
exit
int fa0/1
sw access vlan 2
exit
vlan 3
name network
exit
int vlan 3
ip add 192.168.2.1 255.255.255.0
exit
int fa0/2
sw access vlan 3

3）s3的配置

en
conf t
int gi1/1
sw mode trunk
exit
vlan 2
name office
exit
int vlan 2
ip add 192.168.1.1 255.255.255.0
exit
int fa0/1
sw access vlan 2
exit
vlan 3
name network
exit
int vlan 3
ip add 192.168.2.1 255.255.255.0
exit
int fa0/2
sw access vlan 3

配置完畢，將pc機的ip配置好後，我們來測試一下：

1）首先用192.168.1.2的pc機ping s3的192.168.1.5，結果如下：

Packet Tracer PC Command Line 1.0
PC>ping 192.168.1.5

Pinging 192.168.1.5 with 32 bytes of data:

Reply from 192.168.1.5: bytes=32 time=125ms TTL=128
Reply from 192.168.1.5: bytes=32 time=125ms TTL=128
Reply from 192.168.1.5: bytes=32 time=156ms TTL=128
Reply from 192.168.1.5: bytes=32 time=109ms TTL=128

Ping statistics for 192.168.1.5:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 109ms, Maximum = 156ms, Average = 128ms

經過測試是可以連通的。

2）再用192.168.1.2的pc機ping s3的192.168.2.4，結果如下：

PC>ping 192.168.2.4

Pinging 192.168.2.4 with 32 bytes of data:

Request timed out.
Request timed out.
Request timed out.
Request timed out.

Ping statistics for 192.168.2.4:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

不通，說明在相同vlan下，trunk建立成功。

3）我們再ping一下同交換機的不同vlan：

首先用s2交換機的192.168.1.2 ping 192.168.2.3 結果如下：

PC>ping 192.168.2.3

Pinging 192.168.2.3 with 32 bytes of data:

Request timed out.
Request timed out.
Request timed out.
Request timed out.

Ping statistics for 192.168.2.3:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

不通，說明成功。

4）下面我們來做vtp

在s1上面如下設定

en
conf t
vtp domain office
vtp mode server

s2交換機如下設定

en
conf t
vtp domain office
vtp mode client

s3如下設定

en
conf t
vtp domain office
vtp mode client

然後可以用show vtp st 來檢視一下如何。

OK，以上實驗完成！