Configure 1921 MPLS L2 WAN as bridge mode

[Ethan and Mia]

Hello , 

Follow the picture I want configure Router_B as bridge mode for WAN MPLS L2  

What should i need to do on router B ?  or nothing to do

[Leonid Voronkin]

For a start you need to understand what is the MPLS L2. Do you really need it? If I correctly understood from your picture you just need DHCP Relay

[Ethan and Mia]

Thanks for replay Leonid
I am beginner for Layer 3 . I try to learn by myself . Okay i will learn about DHCP relay , and WAN bridge mode
If you have more suggestion please feel free to tell me

Big Thanks