vqfx202r110reqemuqcow2

and the word “top” – which could mean:

  1. “Top” as in top command – you might want to see resource usage (CPU/memory) while running this QEMU/QCow2 image.
  2. “Top” as in “topology” or “top of” – maybe you’re looking for an article describing the vQFX in a network topology.
  3. “Top” as in best/recommended article – you want the most relevant article about this specific file.

Likely interpretation

vqfx202r110reqemuqcow2 appears to be a filename for a Juniper vQFX virtual switch image (version 20.2R1.10?), possibly meant for QEMU/KVM with a qcow2 disk format.

The top in your query might indicate you want to know how to use top (or htop) on the host to monitor the VM’s resource usage.

1.3 The "req" and "emu" Context

The substring reqemu is a clear indicator that this image is specifically tailored for QEMU-based emulation. Unlike a physical switch, the vQFX’s Routing Engine (RE) and PFE (Packet Forwarding Engine) are emulated via QEMU’s TCG (Tiny Code Generator) or KVM acceleration. The req might also imply that the image expects certain hardware virtualization extensions (Intel VT-x / AMD-V) to be present.

Procedure:

  1. Boot the vQFX:

    qemu-system-x86_64 -drive file=vqfx-20.2R1.10.qcow2,format=qcow2 -m 8192 -smp 4 -net user -net nic

  2. Access the console via VNC or serial.

  3. Log in (default: root / no password or root / Juniper).

  4. Enter shell:

    root@vqfx> start shell

  5. Run top:

    % top -P

    (The -P flag shows per-CPU statistics, essential for multi-core vQFX.)