要求：PC1和PC3互通，PC2和PC4互通
SWA配置：
vlan batch 2 to 3
interface Ethernet0/0/1
port hybrid tagged vlan 2 to 3
#
interface Ethernet0/0/2
port link-type access port default vlan 2
#
interface Ethernet0/0/3
port link-type trunk port trunk allow-pass vlan 3
SWB配置：
vlan batch 2 to 3
interface Ethernet0/0/1
port hybrid tagged vlan 2
port hybrid untagged vlan 3
#
interface Ethernet0/0/2
port link-type trunk
port trunk allow-pass vlan 2 to 3
SWC配置：
vlan batch 2 to 3
interface Ethernet0/0/1
port link-type trunk
port trunk allow-pass vlan 2 to 3
#
interface Ethernet0/0/2
port hybrid pvid vlan 2
port hybrid untagged vlan 2
#
interface Ethernet0/0/3
port hybrid pvid vlan 3
port hybrid untagged vlan 3
PC ping PC3
PC 2 ping PC 4
