在交换机SWA上执行displayinterface Ethernet 1/0/1命令后,输出信息如下:
[SWA]display interface Ethernet 1/0/1 Ethernetl/0/1 current state: UP
PVID: 10
Mdi type: auto
Link delay is 0(sec) Port link-type: trunk
VLAN passing: 1 (default vlan), 10
VLAN permitted: 1 (default vlan), 2-4094 Trunk port encapsulation: IEEE 802.1q Port priority: 0
从以上输出可以判断
[SWA]display interface Ethernet 1/0/1 Ethernetl/0/1 current state: UP
PVID: 10
Mdi type: auto
Link delay is 0(sec) Port link-type: trunk
VLAN passing: 1 (default vlan), 10
VLAN permitted: 1 (default vlan), 2-4094 Trunk port encapsulation: IEEE 802.1q Port priority: 0
从以上输出可以判断
A 端口Ethernetl/0/1是一个Trunk端口,允许所有VLAN的数据侦通过
B 带有VLAN1标签的数据帧离开端口Ethernetl/0/1时会被剥离标签
C 带有VLAN20标签的数据帧可以从端口Ethernetl/0/1转发出去
D 带有VLAN10标签的数据帧进入端口Ethernetl/0/1时不会被丢弃
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