MPLS v6.4 with v5.25

Hello,

During now I facing with MPLS connection is unstable (connection always drop but VPLS’s connection connect as normal).

So could I used MPLS version6.4 (PE) with MPLS version5.25 (CE) ?

Any one could explain me about MPLS in different version please ?

Use 6.5 or newer. It contains a number of MPLS fixes.