Bharat, infact if the ISP routers are in your control, and dont belong to other SP, then its much easier to implement IPv4 and MPLS based switching concurrently.
You can integrate the intermediate IPv4 routers into MPLS by extending the IGP across and enabling LDP. (also you need to integrate these devices with your VPNv4 RR and IPv4 RR as well) This should take care of your IPv4 traffic as well as have MPLS extended across those devices.
But one thing I am not sure is if these are ISP routers then why only 2 routers are there, are they a part of a bigger network or they are just 2 standalone routers in between your PE and CE.
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