Vqfx202r110reqemuqcow2 [ OFFICIAL 2025 ]

: The RE manages the PFE over a virtual link.

em0 is the management interface (virtio).

: Identifies the product line. The vQFX10000 is a virtualized version of Juniper's high-performance QFX series data center switches.

Unlike a standard Linux server or monolithic router VM, the vQFX relies on a that splits the device's tasks into two separate virtual machines: vqfx202r110reqemuqcow2

Wait 3–5 minutes for boot. Default credentials:

Before deployment, you should be aware of a known quirk. Some users and documentation note that the publicly downloadable vQFX image, though labeled as version 20.2, has been found to actually be a 19.4 system internally. For most CLI configuration tasks, this is irrelevant. However, if you are building containerized labs using tools like , you may need to rename the downloaded .qcow2 file to reflect the 19.4 version in your topology file to ensure the automation scripts detect it correctly.

Handles the data plane and traffic forwarding. You must pair the RE with a corresponding PFE image (e.g., vqfx-20.2R1-2019010209-pfe-qemu.qcow ). ⚙️ Specifications & Credentials : The RE manages the PFE over a virtual link

Now, we will deploy the vQFX in the four most popular network emulation platforms.

Full validation for advanced fabric topologies, including BGP EVPN with VXLAN, OSPF, LLDP, and firewall filters.

Handles the control plane and runs the Junos OS CLI. This image ( vqfx-20.2R1.10-re-qemu.qcow2 ) is the RE. The vQFX10000 is a virtualized version of Juniper's

: This is the crown jewel. The QCOW2 (QEMU Copy On Write version 2) format is the industry standard for QEMU-based virtualization. It is the file format of this image. Its key features make it indispensable for lab use:

This technical guide provides a breakdown of what this file represents, how the twin-engine architecture of the vQFX functions, and a step-by-step tutorial on deploying this specific image across network emulation environments like , GNS3 , and Containerlab .

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