Hi,
Here is the required XR configuration: (in general we have ebgp session between PE-CE)
router bgp 10
address-family ipv4 unicast
!
vrf ACME
rd 22.22.22.22:47
bgp router-id 10.0.27.2
address-family ipv4 unicast
!
neighbor 10.0.27.7
remote-as 47
address-family ipv4 unicast
For mode details refer the below link:
http://www.cisco.com/c/en/us/td/docs/routers/crs/software/crs_r4-2/lxvpn/configuration/guide/vc42book/vc42v3.html
Thanks & Regards
Sandeep