I have DWDM link which is terminated on POS interface od CRS-1 router.what are the Layer1/Layer2 parameters should be configured on both sides of this circuit

                   I created VPN L2L between ASA 5520 and ASA5510 since 4 mothes , it worked finebut since yesterday , the ping is fail although the tunnel is UPI checked the ACL ,and the routing but still the same problemso what do you think?

after configuring static NAT command this message appears:INFO: Global address overlaps with NAT exempt configuration