Hi,
Just wanted to understand the topology better. Do you also have LSP in reverse direction from Juniper-R3 to Cisco-R1? Which IGP route you are checking here on Juniper-R3, can you please give an example? Also how are you adding the LSP in inet.0 table? Are you using any knobs like bgp-igp-both-ribs or mpls-forwarding or calling LSP as a point-to-point link in OSPF?
Thanks
Sarathi