Layer 2 WAN Connectivity

Hi all.
This is something new for me and I'd appreciate any help.
We have currently a Layer 2 WAN connection through a 3rd party provider. They use 3400 switches to connect two different sites. One is our DC and the other one is the client. In our DC we have two switches in stack mode 3750Gs. The client has two Dell switches in stack mode as well - Layer 3 switches. We need to configure communications of both sites via the link to perform replication. We do not want VLANs to go through the WAN. What is the best way of configuring our switches? We cannot configure the 3rd party switches.
Thanks for your help.

Hi ,
 If you have got VPLS services from your service provider , You can perform replication between two location , without any addition VLAN creation on your switches . (Same VLAN can be spanned between both datacenter) .
http://www.cisco.com/c/en/us/products/ios-nx-os-software/virtual-private-lan-services-vpls/index.html
If it DWDM link , You can ask your service provider to create new VLAN for your replication , same can extended to your both end switches . 
https://www.cisco.com/en/US/docs/storage/san_switches/mds9000/sw/rel_3_x/configuration/guides/fm_3_4_x/dwdm.pdf
HTH
Sandy

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