10g RFC test on MX performed, but we are seeing frame loss upstream.

You can configure a total of four simultaneous active reflection sessions. The four active reflection sessions can be of the same type or can be a combination of the different types of reflection sessions. For instance, you can configure either four IPv4 reflection sessions or one session each for pseudowire reflection, VPLS reflection, Layer 2 reflection, and IPv4 reflection. The maximum reflection bandwidth supported is 4 Gbps in a standalone test condition. Starting in Junos OS Release 20.2R1, MPC10E and MX2K-MPC11E support a maximum reflection bandwidth of 100 Gbps.