How to forward traffic from an ISP with VLAN through CRS326 to another office?

Question

network hardware

Good afternoon.
There are two buildings with their own server rooms.
Both server rooms are connected by optics via SFP + on Mikrotik CRS326.
The first server room has a provider input and other servers.
The provider provides Internet via PPPoE and Sip traffic via VLAN 222.
The provider also pushes traffic to the state. to resources on VLAN 333.
There was a task to carry away the Internet server from one server in the second.
In this case, you need to wrap the provider's traffic through port 326 to the port of the second 326.
A sort of virtual cable that transmits all the tags from the provider to the second building without crossing the local traffic.
QinQ?

Answer 1

Thanks everyone for the advice. Helped.
I'll tell you how I solved the problem.
It's good that the provider decided to tag PPPoE traffic to its one more VLAN (let it be VLAN111).
I was worried that it would not be tagged.
On CRS326-1, I created 3 VLANs in the bridge (111,222,333). I told the bridge to tag the 23 port of the switch and SFP (fiber) with these VLANs. Enabled ingress filtering.
I did the same on CRS326-2.
Plugged ISP into port 23 of CRS326-1. Moved the server. I connected it to the 23rd port of the CRS326-2.
On the server, the network interface is configured to receive/transmit tagged traffic over all three VLANs.
Everything works on "wire speed", HW offloading is enabled.

Answer 2

Hardware QinQ CRS326 does not know how. Either set up a trunk between sfp + and vlans between them, or install routers, raise mpls on them and drive vlans through mpls

Answer 3

QinQ then why do you need it ??? You can't just forward the vlan, right?