Steps to create VPNv4 routes in Juniper

Steps to create VPNv4 routes in Juniper 

(CE)-----(PE-A)-------(OSPF-MPLS-LDP-IBGP--VPNv4PEERING)----(PE-B)--(CE)

1, Create a routing path between PE to PE(using IGP or IBGP)

2, Create VPN VRF instances in PE routers (eg VRF_Customer1)

3, Create the L3vpn BGP peer 

4, Create a policy for import and export to filter the VPNV4 routes from neighbors 

Create a policy in PE's and bring them to VRF instances

PE-A                                                        PE-B

------------                                            ---------------------------

Import : 100300                              Export 100300

Export :100301                              Import 100301   

Use policy to redistribute routes from OSPF to BGP