思科和华为交换机互联问题

所有交换机之间的端口都配置成trunk口，做一下vlan的透传即可，但是这里的话，三个交换机都需要配置：
A配置：
interface interface GigabitEthernet0/1

switchport trunk encapsulation dot1q

switchport mode trunk

B配置：
vlan 3
vlan 4
interface interface GigabitEthernet0/1
switchport mode trunk
interface interface GigabitEthernet0/2
switchport mode trunk

C配置：
vlan 3
vlan 4
interface GigabitEthernet0/0/2
port link-type trunk
port trunk allow-pass vlan all

interface GigabitEthernet0/0/3
port link-type access
port default vlan 3

interface GigabitEthernet0/0/4
port link-type access
port default vlan 4