Step 1, configure MP BGP between the PE devices.
-The remote side PE has a loopback of 192.168.1.1/32 and the central side PE has a loopback of 192.168.1.2/32.
-Use an internal AS of 100.

Step 2, configure MPLS VPN session for the remote and central sites.
-Use RD and RTs of 1:1
-The remote site has network 172.16.1.0/24 and the central site has network 172.16.2.0/24.
-Use static routes to define the customer networks.
-On both sides, customer A is connected to interface F0/0.

Source : Networking Forum