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Vqfx-20.2r1.10-re-qemu.qcow2 Now

The file vqfx-20.2r1.10-re-qemu.qcow2 is a virtual disk image for the Routing Engine (RE) of a Juniper vQFX virtual switch. It is used in network simulation environments like GNS3, Cisco Modeling Labs (CML), and EVE-NG. Key Specifications Device Type: Virtual Juniper QFX10000 series switch.

Component: Routing Engine (Control Plane). It must be paired with a separate Packet Forwarding Engine (PFE) image (e.g., vqfx-20.2R1-2019010209-pfe-qemu.qcow) to function as a complete switch. Version: Junos OS 20.2R1.10.

Format: .qcow2 (QEMU Copy-On-Write), standard for KVM-based hypervisors. Typical Setup Requirements

Memory: 1024 MB RAM is generally recommended for the RE instance. Default Credentials: Username: root Password: Juniper (Note: the "J" is usually capitalized).

Connectivity: In simulation tools, you typically connect the em1 interface of the RE directly to the em1 interface of the PFE for internal communication. Common Usage Issues

Rebooting: To avoid corruption of the live file system, always use the command request system power-off both-routing-engines (or halt) before shutting down the VM.

Non-Master Role: If the RE starts in a "non-master" role, a common workaround is to use the command request virtual-chassis reactivate or reboot both the RE and PFE simultaneously. Guide: Importing Juniper vMX and vQFX into CML2.4

Junos vQFX10000 is a virtualized version of the physical QFX10000 switch, designed for network simulation, lab testing, and automation development. The specific image file Vqfx-20.2r1.10-re-qemu.qcow2 represents the Routing Engine (RE) portion of this virtual switch for version 20.2R1.10, formatted for QEMU-based hypervisors. Understanding the vQFX Architecture

Unlike a single-file virtual machine, the vQFX typically operates using a dual-VM architecture to simulate the high-performance hardware of the QFX series:

Routing Engine (RE): Handles the control plane, running Junos OS. This is what the Vqfx-20.2r1.10-re-qemu.qcow2 file powers. Vqfx-20.2r1.10-re-qemu.qcow2

Packet Forwarding Engine (PFE): Handles the data plane (transit traffic).

Communication: The RE and PFE connect via an internal bridge to function as a single logical switch. Key Technical Specifications Image Details Filename: Vqfx-20.2r1.10-re-qemu.qcow2 Junos Version: 20.2R1.10 Format: QCOW2 (QEMU Copy-On-Write) Primary Role: Control Plane / Management Recommended Resource Allocation (Per RE Instance) vCPU: 1 to 2 Cores RAM: 2 GB to 4 GB Disk Space: ~5 GB (Expanding) Deployment and Use Cases 1. Network Simulation (GNS3, EVE-NG, PNETLab)

This image is a staple for network engineers using emulation platforms. It allows for building complex data center topologies (like Leaf-Spine architectures) without needing physical hardware that costs thousands of dollars. 2. CI/CD and Automation Testing

Because it runs authentic Junos code, developers can use this image to: Validate Ansible playbooks. Test Python/PyEZ scripts.

Verify NETCONF/REST API calls against a live Junos interface. 3. Certification Preparation

It is an essential tool for candidates studying for Juniper certifications, specifically: JNCIS-ENT / JNCIP-ENT (Enterprise Routing and Switching) JNCIS-DC / JNCIP-DC (Data Center) Installation Quick-Start (General QEMU)

To run the RE image manually via QEMU, you would typically use a command similar to this:

qemu-system-x86_64 -m 2048 -hda Vqfx-20.2r1.10-re-qemu.qcow2 -net nic -net user

Note: For a functional switch, you must also link this instance to a corresponding PFE instance. Benefits of the 20.2R1.10 Release The file vqfx-20

Version 20.2 introduced several stability fixes and features for the QFX virtual line, including: Enhanced EVPN-VXLAN support for data center overlays.

Improved convergence times for routing protocols like BGP and OSPF.

Refined telemetry capabilities for modern network monitoring.

💡 Pro-Tip: When setting up vQFX in EVE-NG or GNS3, ensure you use the "virtio-net-pci" adapter type for the best performance and compatibility between the RE and PFE.

4. System Requirements & Compatibility

Step 2: Prepare the Image (Copy-on-Write)

Never run the base image directly. Use a backing file to create instances.

# Create a directory for your lab
mkdir ~/vqfx-lab
cd ~/vqfx-lab

Tuning for KVM


    

  • CPU Pinning: Assign dedicated host CPU cores to the vQFX process to avoid packet drops.
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  • VirtIO vs e1000: Always use model=virtio for data interfaces. VirtIO is paravirtualized; e1000 is too slow for routing protocols.
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  • Memory: 4GB is the floor. For EVPN with 10 VXLANs, bump to 6GB.
    • 



10. Conclusion


Vqfx-20.2r1.10-re-qemu.qcow2 is a stable, lightweight control-plane image for Juniper vQFX environments, suitable for learning and small-to-medium scale network simulation. It requires a companion PFE image for data-plane functionality. While it shows its age (20.2R1) compared to modern vJunOS releases, it remains widely used in educational labs due to its low resource footprint and compatibility with major emulators.


Final recommendation: Use this image for JunOS CLI practice, routing protocol labs, and automation testing. For EVPN/VXLAN data center work, prefer vJunOS-switch 22.x or later.




Document generated for educational and operational planning purposes. Not an official Juniper Networks publication.


The file "Vqfx-20.2r1.10-re-qemu.qcow2" is the Routing Engine (RE) disk image for the  Juniper vQFX10000  virtual switch, specifically version 20.2R1.10. CPU Pinning: Assign dedicated host CPU cores to


If you are looking for documentation or a "paper" on how to deploy or use this specific image, here are the key details you need to know: Overview of the Image


Role: This is the Control Plane (RE) of the virtual switch. In a vQFX setup, this image handles the Junos OS, routing protocols, and management.


Format: .qcow2 is a QEMU copy-on-write format, typically used in Linux KVM environments or network emulators like GNS3, EVE-NG, or PNETLab.


Companion: To have a functional switch, this image must be paired with a PFE (Packet Forwarding Engine) image (usually named something like vqfx-20.2r1.10-pfe-qemu.qcow2). Standard Deployment Specifications According to Juniper's technical documentation for vQFX: vCPU: 1 for the RE. RAM: 2 GB (minimum) for the RE. Interfaces: em0: Management interface.


em1: Internal link to communicate with the PFE image (crucial for the switch to function). Useful Resources


Juniper vQFX Documentation: The official vQFX10000 Getting Started Guide provides the architectural background.


EVE-NG Juniper Guide: Since this specific filename format is common in the emulation community, the EVE-NG Juniper vQFX setup guide is often the best "manual" for getting this specific version running.


This file is a QEMU disk image for vQFX, which is the virtualized version of Juniper Networks' QFX Series switch. It is specifically the Routing Engine (RE) image.




3. Installation Guide: EVE-NG


This is the most common platform for this specific image format. Below is the standard procedure to install it.


1. Understanding the File


    

  • Filename: Vqfx-20.2r1.10-re-qemu.qcow2
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  • Component: RE (Routing Engine). This runs the Junos control plane, handling protocols like BGP, OSPF, LACP, and the CLI interface.
    • 

  • Format: qcow2 (QEMU Copy On Write). This is the standard disk image format for QEMU virtualization.
    • 

  • Version: 20.2R1.10 (Released around 2020).
    •