Subnet needs to be expand through L3 Netwok

[technerd81]

Hi 

I have 4 sites which are connected through point to point links on L3 switches but I have issue which I needs to expand same VLAN on two sites which is the most suitable way of doing that currently those are connected through  ospf.

Basically I need

VLAN 10 to be on site A and Site C

VLAN 1,2 & 3 needs to be on Site A and Site B

I have attached the diagram Any suggestions highly appreciate. 

one more thing all switches are cisco 3850 ip base 

[Georg Pauwen]

Hello,

with your current equipment (3850 with IP Base) your options are very limited. Your best choice would probably be to get with your ISP and check if they can implement some sort of Ethernet Private Line (EPL) solution.

If you are willing to invest in new equipment, QinQ and L2PT (as described in the document linked below) would be other options. 

IEEE 802.1Q Tunneling (QinQ) and L2PT on L2

https://www.cisco.com/c/en/us/td/docs/routers/access/ISRG2/software/feature/guide/QinQ_L2PT.html

[technerd81]

Hi Georg Pauwen 

Thank you very much for your valuable feedback. As investing more is not possible at this stage and those links are point to point radio links which manage by us and the devices which I mention in the diagram is actual 3850s so I don't think EPL will possible  is there other solutions or can EPL implement through 3850s???