: The two VMs must be connected via their internal link interface, typically on both devices. System Resources : Minimum 1024 MB RAM and 2 vCPUs. : Minimum 1024 MB (recommended 4096 MB) and 2 vCPUs. Platform-Specific Setup 1. GNS3 Configuration : Add the image as a new NIC Settings : Change the network adapter type to virtio-net-pci

A common point of confusion is that the vqfx-20.2R1.10-re-qemu.qcow2 file downloaded from Juniper's portal has been reported by users to sometimes identify itself internally as version . Setting Up vQFX in Lab Environments

vqfx202r110reqemuqcow2 (often appearing as vqfx-20.2R1.10-re-qemu.qcow2 Routing Engine (RE)

:

: In EVE-NG, ensure the folder is named correctly (e.g., vqfxre-20.2R1.10 ) and the file is renamed to virtioa.qcow2 for the emulator to recognize it.

After creating a VM in virt-manager (using “Import existing disk image”), manually edit the XML with virsh edit vqfx-re :

with similar steps, connecting it to the RE via a private network on a second interface.

Running the Juniper vQFX image vqfx-20.2R1.10-re-qemu.qcow2 requires understanding that vQFX operates as a split-brain system consisting of two separate virtual machines: the Routing Engine (RE) Packet Forwarding Engine (PFE) Cisco Learning Network Core Setup Requirements

Since you asked to "develop a feature" on this, I’ll assume you want to the behavior of a vQFX instance running from that QCOW2 image under KVM/QEMU.

EVE-NG (Emulated Virtual Environment - Next Generation) is another powerful network emulation platform.

The image file . Getting this specific image to work reliably requires understanding Juniper's split-architecture design, applying exact resource configurations, and mapping virtual interfaces precisely within a QEMU-based hypervisor environment like GNS3, EVE-NG, Cisco Modeling Labs (CML), or Containerlab.

If you are interested, I can provide a step-by-step tutorial on setting up vQFX in EVE-NG or GNS3 if you have those platforms ready.

Vagrant.configure("2") do |config| config.vm.provider :libvirt do |libvirt| libvirt.memory = 4096 libvirt.cpus = 2 end end

If the image hangs at the GRUB bootloader or continually reboots during the kernel initialization phase, your CPU definition is likely incompatible. Ensure you are using -cpu host in raw QEMU, or ensure your nested virtualization flags are enabled on the physical host machine by running: cat /sys/module/kvm_intel/parameters/nested Use code with caution. It should return Y or 1 . 2. Interfaces (xe-0/0/0, etc.) are Missing

Before committing, ensure the internal em1 link is preserved, otherwise, the RE will not communicate with the PFE [YouTube].