After defining the VM, start it:
virsh start vqfx-re
virsh console vqfx-re
You should see the FreeBSD boot loader. Patience is critical—the first boot can take 3-5 minutes as it expands the root filesystem.
Login credentials (default):
If you see a kernel panic referencing virtio_blk or pci_alloc, your XML is incorrect. Return to Step 2 and verify the machine type. vqfx202r110reqemuqcow2 work
qemu-img info vqfx202r110reqemuqcow2
# Check size, backing file, format
Mount it (requires root + libguestfs-tools):
sudo modprobe nbd
sudo qemu-nbd --connect=/dev/nbd0 vqfx202r110reqemuqcow2
sudo mkdir /mnt/vqfx
sudo mount /dev/nbd0p1 /mnt/vqfx # or p2, depending on partition layout
You’ll typically find:
The physical Juniper QFX Series switches are high-performance devices used for spine-leaf architectures. The vQFX is a software counterpart that runs as a virtual machine. It allows engineers to: After defining the VM, start it: virsh start
However, vQFX images are notoriously resource-intensive and finicky about virtualization settings. The qcow2 format is standard for KVM (Kernel-based Virtual Machine) and Proxmox, but also can be converted for VMware ESXi or VirtualBox.
The key phrase vqfx202r110reqemuqcow2 work implies that many users struggle to boot this specific iteration. Let’s solve that.
Once verified, the vqfx202r110reqemuqcow2 will outperform many older vQFX images, offering stable EVPN and MPLS data plane forwarding. Happy virtual networking! You should see the FreeBSD boot loader
This article is part of a series on open-source network emulation. For further reading, explore Juniper’s official vQFX documentation or the libvirt user guide.
Assuming you have downloaded the file vqfx202r110reqemuqcow2 (likely from a Juniper account or community lab source), follow these phases.