Hopefully an easy one but I just cant get this to work.   We have a Cisco 2900 series router (ISP managed) to our MPLS.  They have configured a port on it as follows:   interface GigabitEthernet0/1 description Meraki VPN Link no ip address duplex auto speed auto ! interface GigabitEthernet0/1.5 encapsulation dot1Q 5 ip address 172.16.1.17 255.255.255.240 !   We are connecting to a LAN port on the MX since we dont want any NAT.   I have tried setting the MX Port up as Trunk, Native VLAN5 but traffic wont pass on it.  I also tried Access VLAN 5 on the MX but with no luck. If i use the WAN port on the MX and set it as a VLAN 5, it works.   What am i missing when it is a LAN port? ... View more