● 交换机命令show interfaces type 0/port_# switchport|trunk用于显示中继连接的配置情况，下面

2950# show interface fastEthernet0/1 switchport

Name: fa0/1

Switchport: Enabled

Administrative mode: trunk

Operational Mode: trunk

Administrative Trunking Encapsulation: dot1q

Operational Trunking Encapsulation: dot1q

egotiation of Trunking: Disabled

Access Mode VLAN: 0 ((Inactive))

Trunking Native Mode VLAN: 1 (default)

Trunking VLANs Enabled: ALL

Trunking VLANs Active: 1,2

Pruning VLANs Enabled: 2-1001

Priority for untagged frames: 0

Override vlan tag priority: FALSE

Voice VLAN: none

在这个例子中，端口fa0/1的链路模式被设置为 （56） 状态，默认的VLAN是 （57） 。

（56）

A. Desirable

B. No-Negotiate

C. Auto negotiate

D. trunk

（57）

A. VLAN0

B. VLAN1

C. VLAN2

D. VLAN3