华三与华为trunk连接

华三5120与华为5720做trunk连接，

华三配置

Interface Physical Protocol IP Address Description 

Vlan-interface1 up up 192.168.20.1 Vlan-inte... 

Vlan-interface2 up up 172.17.6.1 Vlan-inte...

interface GigabitEthernet1/0/18 

 port link-type trunk

 port trunk permit vlan all

华为配置

interface GigabitEthernet0/0/21 

 port link-type trunk 

 port trunk allow-pass vlan 2 to 4094

Vlanif1 192.168.20.254/24 up up 

Vlanif2 172.17.6.254/24 up up   

两端的vlan都是Up，但是相互ping不通。两端的pvid都是vlan 1.为什么不通呢