导语：
Trunk端口一般用于交换机之间连接的端口。它可以承载多个不同VLAN数据，不属于任何一个具体的VLAN。
拓扑图：
步骤：
1.基本配置：
如拓扑图所示，配置各个物理设备和接口，并完成连通性测试。
2.创建VLAN，配置Access接口：
[S1]vlan 10
[S1-vlan10]description R&D
[S1-vlan10]vlan 20
[S1-vlan20]description Market
[S2]vlan 10
[S2-vlan10]description R&D
[S2-vlan10]vlan 20
[S2-vlan20]description Market
[S3]vlan 10
[S3-vlan10]description R&D
[S3-vlan10]vlan 20
[S3-vlan20]description Market
查看Vlan信息：
[S3]display vlan
The total number of vlans is : 3
--------------------------------------------------------------------------------
U: Up; D: Down; TG: Tagged; UT: Untagged;
MP: Vlan-mapping; ST: Vlan-stacking;
#: ProtocolTransparent-vlan; *: Management-vlan;
--------------------------------------------------------------------------------
VID Type Ports
--------------------------------------------------------------------------------
1 common UT:GE0/0/1(U) GE0/0/2(U) GE0/0/3(D) GE0/0/4(D)
GE0/0/5(D) GE0/0/6(D) GE0/0/7(D) GE0/0/8(D)
GE0/0/9(D) GE0/0/10(D) GE0/0/11(D) GE0/0/12(D)
GE0/0/13(D) GE0/0/14(D) GE0/0/15(D) GE0/0/16(D)
GE0/0/17(D) GE0/0/18(D) GE0/0/19(D) GE0/0/20(D)
GE0/0/21(D) GE0/0/22(D) GE0/0/23(D) GE0/0/24(D)
10 common
20 common
VID Status Property MAC-LRN Statistics Description
--------------------------------------------------------------------------------
1 enable default enable disable VLAN 0001
10 enable default enable disable R&D
20 enable default enable disable Market
查看VLAN简要信息：
[S3]display vlan summary
static vlan:
Total 3 static vlan.
1 10 20
dynamic vlan:
Total 0 dynamic vlan.
reserved vlan:
Total 0 reserved vlan.
配置S1和S2的Vlan信息：
[S1]interface e0/0/2
[S1-Ethernet0/0/2]port link-type access
[S1-Ethernet0/0/2]port default vlan 10
[S1]interface e0/0/3
[S1-Ethernet0/0/3]port link-type access
[S1-Ethernet0/0/3]port default vlan 20
[S2]interface e0/0/3
[S2-Ethernet0/0/3]port link-type access
[S2-Ethernet0/0/3]port default vlan 10
[S2]interface e0/0/4
[S2-Ethernet0/0/4]port link-type access
[S2-Ethernet0/0/4]port default vlan 20
查看S1和S2的vlan配置情况：
[S1]display port vlan
Port Link Type PVID Trunk VLAN List
-------------------------------------------------------------------------------
Ethernet0/0/1 hybrid 1 -
Ethernet0/0/2 access 10 -
Ethernet0/0/3 access 20 -
[S2]display port vlan
Port Link Type PVID Trunk VLAN List
-------------------------------------------------------------------------------
Ethernet0/0/1 hybrid 1 -
Ethernet0/0/2 hybrid 1 -
Ethernet0/0/3 access 10 -
Ethernet0/0/4 access 20 -
3.配置Trunk接口：
测试PC-1和PC-3、PC-2和PC-4的连通性：
PC>ping 10.1.1.3
Ping 10.1.1.3: 32 data bytes, Press Ctrl_C to break
From 10.1.1.1: Destination host unreachable
From 10.1.1.1: Destination host unreachable
From 10.1.1.1: Destination host unreachable
From 10.1.1.1: Destination host unreachable
From 10.1.1.1: Destination host unreachable
--- 10.1.1.3 ping statistics ---
5 packet(s) transmitted
0 packet(s) received
100.00% packet loss
PC>ping 10.1.1.4
Ping 10.1.1.4: 32 data bytes, Press Ctrl_C to break
From 10.1.1.2: Destination host unreachable
From 10.1.1.2: Destination host unreachable
From 10.1.1.2: Destination host unreachable
From 10.1.1.2: Destination host unreachable
From 10.1.1.2: Destination host unreachable
--- 10.1.1.4 ping statistics ---
5 packet(s) transmitted
0 packet(s) received
100.00% packet loss
可以观察到同部门的PC不能互相通信。
配置Trunk接口：
[S1]interface e0/0/1
[S1-Ethernet0/0/1]port link-type trunk
[S1-Ethernet0/0/1]port trunk allow-pass vlan 10 20
[S2]interface e0/0/2
[S2-Ethernet0/0/2]port link-type trunk
[S2-Ethernet0/0/2]port trunk allow-pass vlan 10 20
[S3]interface g0/0/1
[S3-GigabitEthernet0/0/1]port link-type trunk
[S3-GigabitEthernet0/0/1]port trunk allow-pass vlan all
[S3]interface g0/0/2
[S3-GigabitEthernet0/0/2]port link-type trunk
[S3-GigabitEthernet0/0/2]port trunk allow-pass vlan all
查看Trunk的配置情况：
[S3]display port vlan
Port Link Type PVID Trunk VLAN List
-------------------------------------------------------------------------------
GigabitEthernet0/0/1 trunk 1 1-4094
GigabitEthernet0/0/2 trunk 1 1-4094
此时，再次在PC间PING连通性：
PC>ping 10.1.1.3
Ping 10.1.1.3: 32 data bytes, Press Ctrl_C to break
From 10.1.1.3: bytes=32 seq=1 ttl=128 time=94 ms
From 10.1.1.3: bytes=32 seq=2 ttl=128 time=62 ms
From 10.1.1.3: bytes=32 seq=3 ttl=128 time=62 ms
From 10.1.1.3: bytes=32 seq=4 ttl=128 time=79 ms
From 10.1.1.3: bytes=32 seq=5 ttl=128 time=78 ms
--- 10.1.1.3 ping statistics ---
5 packet(s) transmitted
5 packet(s) received
0.00% packet loss
round-trip min/avg/max = 62/75/94 ms
PC>ping 10.1.1.4
Ping 10.1.1.4: 32 data bytes, Press Ctrl_C to break
From 10.1.1.4: bytes=32 seq=1 ttl=128 time=110 ms
From 10.1.1.4: bytes=32 seq=2 ttl=128 time=62 ms
From 10.1.1.4: bytes=32 seq=3 ttl=128 time=78 ms
From 10.1.1.4: bytes=32 seq=4 ttl=128 time=78 ms
From 10.1.1.4: bytes=32 seq=5 ttl=128 time=79 ms
--- 10.1.1.4 ping statistics ---
5 packet(s) transmitted
5 packet(s) received
0.00% packet loss
round-trip min/avg/max = 62/81/110 ms
至此，Trunk接口实验已经配置完成！
最后，思考一个问题：
可以把PC机相连的交换机接口配置为Trunk接口吗？
答：当然可以。本质上和之前的实验也是一样的。