Piplink SDX loadbalancer native vlan

I have one Cisco router with current configuration

interface GigabitEthernet0/0/1.500
encapsulation dot1Q 500 native ---------------> native vlan
ip address 10.10.0.253 255.255.192.0
!
interface GigabitEthernet0/0/1.501
encapsulation dot1Q 501
ip address 10.11.0.253 255.255.0.0

interface GigabitEthernet0/0/1.503
encapsulation dot1Q 503
ip address 10.12.0.252 255.255.0.0
!
interface GigabitEthernet0/0/1.600
encapsulation dot1Q 600
ip address 10.16.0.253 255.255.192.0

I need to replace this device with Piplink SDX loadbalancer, when i configured the port as trunk → custom , and select all vlans , the traffic not passed
any one can help how to configure native vlan same like Cisco router (VLAN 500 untagged ) and other vlans tagged.

Make sure you are on firmware 8.5.3
Then in port settings set the PVID to your VLAN 500 and leave the port as trunk with any VLAN networks selected: