Vqfx-20.2r1.10-re-qemu.qcow2 May 2026

Prerequisites:

Basic KVM command (RE only, no data plane):

qemu-system-x86_64 \
  -name vqfx-re \
  -m 4096 \
  -smp 2 \
  -drive file=Vqfx-20.2r1.10-re-qemu.qcow2,if=ide,index=0 \
  -netdev user,id=mgmt,net=192.168.76.0/24,dhcpstart=192.168.76.10 \
  -device e1000,netdev=mgmt \
  -nographic \
  -serial telnet:127.0.0.1:5001,server,nowait

Login:

Assuming you want to add a feature like:

If you're working with this specific image, ensure you have a clear understanding of its intended use, compatibility with your host environment, and compliance with any relevant licensing agreements.

vqfx-20.2R1.10-re-qemu.qcow2 Routing Engine (RE) disk image for the Juniper vQFX virtual switch. To use it effectively in a network lab (like GNS3, EVE-NG, or CML), it must be paired with a corresponding Packet Forwarding Engine (PFE) Technical Overview & Setup Guide 1. System Requirements Minimum 1024 MB RAM for the RE. Virtualization: Requires KVM/QEMU acceleration. Default Credentials: (Note: Capital 'J'). 2. Architecture & Connectivity Vqfx-20.2r1.10-re-qemu.qcow2

The vQFX operates as a split-VM system where the RE handles the control plane and the PFE handles the data plane. RE Interface em0: Management/Admin VLAN. RE Interface em1: Dedicated link to the PFE's em1 interface. Traffic Ports:

User-defined switch ports are typically presented on the RE but processed by the PFE. 3. Common Implementation Steps Import using the Juniper vQFX RE appliance file ). Assign the image to the QEMU VM configuration. In EVE-NG: Create a directory (e.g., /opt/unetlab/addons/qemu/vqfx-20.2R1.10/ ), rename the file to , and run the fixpermissions In Cisco CML: Import the node definitions and upload the via the Image Definitions tab. Known Issues & Troubleshooting Guide: Importing Juniper vMX and vQFX into CML2.4

vqfx-20.2R1.10-re-qemu.qcow2 file is the Routing Engine (RE) disk image for the Juniper vQFX10000

, a virtualized version of the physical QFX10000 data center switch

. It handles the control plane functions, while a separate Packet Forwarding Engine (PFE) image handles the data plane. Cisco Learning Network Key Specifications Junos OS 20.2R1.10. File Size: Approximately 675 MB. MD5 Checksum: 20220bfa3d387184fce957936eeeb4ec Recommended RAM: Recommended CPUs: 1 or 2 vCPUs. Disk Interface: IDE or Virtio. Configuration & Setup Prerequisites:

To "put together" a working vQFX node, you must link the RE to a PFE instance (e.g., vqfx-20.2R1-2019010209-pfe-qemu.qcow Cisco Learning Network Management Port ( Connect this to your management network or admin VLAN. Internal Link ( You must connect this interface directly to the PFE's

interface to establish the internal control link between the two VMs. Switch Ports:

In this virtual architecture, the logical switch ports are actually configured on the RE, but traffic is processed by the PFE. Default Credentials: (Note: the password is case-sensitive with a capital 'J'). Cisco Learning Network Supported Platforms

format is optimized for QEMU-based environments, making it compatible with: Available via the Juniper vQFX RE appliance in the GNS3 Marketplace. Cisco CML: Can be imported using community node definitions. KVM/Libvirt:

Can be manually installed on Linux servers for testing and QA. Cisco Learning Network Guide: Importing Juniper vMX and vQFX into CML2.4 Basic KVM command (RE only, no data plane):

This guide provides an overview and instructions for using the Vqfx-20.2r1.10-re-qemu.qcow2 file.

This file is a specific Routing Engine (RE) disk image for the Juniper vQFX (Virtual QFX) network switch, running Junos OS version 20.2R1.10. It is designed to be used with the vPFE (Virtual Packet Forwarding Engine) image to create a complete, functional virtual switch for lab environments, typically using EVE-NG or GNS3.

Deploy three vQFX instances (2 leaf, 1 spine). Use the switch-br bridge to interconnect their EBGP sessions.

Configuration snippet for Leaf1 (EBGP with Spine):

set protocols bgp group UNDERLAY type external
set protocols bgp group UNDERLAY peer-as 65001
set protocols bgp group UNDERLAY neighbor 10.0.0.1 (Spine IP)
set protocols evpn encapsulation vxlan
set protocols evpn default-gateway do-not-advertise