Prior to installation, the host system must meet the following minimum requirements for Release 14.1:
to ensure you have enough interfaces for complex topologies. : Management interface ( Eth2 - Eth11 : These map to Juniper interfaces Local PFE Optimization
Reboot the instance to initialize the local interfaces (typically starting from for a newer version of vMX on Juniper vMX on GNS3 - Brezular's Blog