I have a carrier Ethernet network.
The ether type of my outer VLANs is 0x88A8 as per IEEE compliant Provider Bridges.
My goal is for the PPPoE server to be getting requests coming from dynamically created Client VLANs over a common Service Provider VLAN (0x88A8 Ethertype).
Then the goal is to dynamically route IPv4 and IPv6 chunks coming from my core router based on a well known tuple of SP VLAN/Client VLAN.
For instance, the service provided to a customer may contain
Inside SP VLAN 200, Client VLAN 20 contains IPv4 feed over PPPOE interface, client VLAN 21 is SIP TRUNK.
So for a customer with SP VLAN 200, I know to bridge through client VLAN 21, but create dynamically a PPPoE interface.
It should be possible, the only thing that strikes me is to beware of and issues with MTU since you get another 4 bits in the ip headers due to the QinQ (or “use service tag” like Mikrotik call it). If you have a clean Mikrotik network for the QinQ links, all Routerboard units should support sufficient L2MTU to handle it without any changes.
By selecting ‘User service Tag’, the VLAN ID becomes an SVLAN ID.
I just tested it with an MRV OS912 switch with the following command on the MRV side:
vman core-ethertype-1 0x88a8
port tagged-outbound-mode tagged 1
interface vlan vif200
tag 200
description svlan 200
ip 192.168.200.1/24