Running the virtual routing engine ( vqfx-20.2R1.10-re-qemu.qcow2 ) requires a dual-VM setup because the vQFX is split into a Routing Engine (RE) and a Packet Forwarding Engine (PFE) . To make it work, you must link these two separate QEMU virtual machines over a dedicated internal network. Core Components Required To get a functional switch, you need both images: RE Image: vqfx-20.2R1.10-re-qemu.qcow2 (the control plane).
The Virtual Infrastructure: Understanding the vQFX-10000 in Emulated Environments vqfx202r110reqemuqcow2 work
To get this specific image working, you typically need its counterpart, the PFE (Packet Forwarding Engine) Running the virtual routing engine ( vqfx-20
If the format is raw or vmdk, you will need to convert it: you typically need its counterpart