二层交换机实现不一样vlan通讯

 实验需求：
PC1属于vlan10
PC2属于vlan20
实现PC1与pc2互通
实验拓扑：

 实验过程：
 第一种实现方式：
sw1:
vlan batch 10 20
interface GigabitEthernet0/0/1
port link-type access
port default vlan 10
interface GigabitEthernet0/0/2
port link-type trunk
port trunk pvid vlan 10 //默认为1，为了去标签改为10
port trunk allow-pass vlan 2 to 4094
sw2:
vlan batch 10 20
interface GigabitEthernet0/0/1
port link-type trunk
port trunk pvid vlan 20 //无标签打上20为了可以发到vlan20
port trunk allow-pass vlan 2 to 4094
interface GigabitEthernet0/0/2
port link-type trunk
port trunk pvid vlan 10 //无标签打上10为了可以发到vlan10
port trunk allow-pass vlan 2 to 4094
sw3:
vlan batch 10 20
interface GigabitEthernet0/0/1
port link-type trunk
port trunk pvid vlan 20 //为了去标签
port trunk allow-pass vlan 2 to 4094
interface GigabitEthernet0/0/2
port link-type access
port default vlan 20
 实验结果：

 实验原理：
Access链路
收包时打标签 pvid
发包时去标签
Trunk链路
发包时若是pvid相同则去标签（默认pvid=1）能够修改，若是pvid不一样直接发送不改标签
收包时若是有标签直接收，无标签打标签转发

 第二种实现方式：全部链路类型改为access
Sw1
interface GigabitEthernet0/0/1
port link-type access
port default vlan 10
interface GigabitEthernet0/0/2
port link-type access
port default vlan 10
sw2
interface GigabitEthernet0/0/1
port link-type access
port default vlan 20
interface GigabitEthernet0/0/2
port link-type access
port default vlan 20
sw3
interface GigabitEthernet0/0/1
port link-type access
port default vlan 20
interface GigabitEthernet0/0/2
port link-type access
port default vlan 20
 第三种实现方式：Hybrid类型
Sw1
interface GigabitEthernet0/0/1
port hybrid pvid vlan 10
port hybrid untagged vlan 10 20
interface GigabitEthernet0/0/2
port hybrid tagged vlan 10 20
sw2
interface GigabitEthernet0/0/1
port hybrid tagged vlan 10 20
interface GigabitEthernet0/0/2
port hybrid tagged vlan 10 20
sw3
interface GigabitEthernet0/0/1
port hybrid tagged vlan 10 20
interface GigabitEthernet0/0/2
port hybrid pvid vlan 20
port hybrid untagged vlan 10 20
实验原理：
经过tag和untag肯定哪一种数据帧经过