The vQFX splits control (RE) and forwarding (PFE). Check:
show chassis fpc
show version
If PFE shows Online, your image works. If Offline or Testing — the qcow2 lacks proper kernel modules for your hypervisor’s virtual NIC.
At the end, you’ll have:
If instead you meant develop a new software feature inside the vQFX (like a custom commit script, SLAX policy, or Python op script), let me know and I’ll provide a full SLAX/PyEZ example for that specific vqfx202r110 release.
Guide to Juniper vQFX: Implementing vqfx202r110reqemuqcow2
The vqfx202r110reqemuqcow2 refers to a specific virtual disk image for the Juniper vQFX10000
Routing Engine (RE) running Junos version 20.2R1.10 in a QEMU-compatible format. The vQFX is a virtualized version of the physical QFX10000 series switches, designed for network simulation and lab testing without requiring expensive hardware. Architecture of vQFX
To function correctly, the vQFX requires two separate virtual machines working in tandem:
Routing Engine (RE): The control plane where the Junos OS runs and configurations are managed. This is the component represented by the vqfx202r110reqemuqcow2 image.
Packet Forwarding Engine (PFE): The data plane that handles traffic forwarding. In virtualized environments, this is often a separate "Cosim" image. Deployment Prerequisites
Running this image typically requires a network emulator such as EVE-NG or GNS3. download for vQFX 20.2 is actually 19.4 | Data Center
The vqfx202r110reqemuqcow2 is the specific QEMU-formatted disk image for the Routing Engine (RE) of Juniper’s vQFX 20.2R1.10 virtual switch. In a virtualized environment, this image acts as the "brain" of the switch, handling the control plane and management, while a separate Packet Forwarding Engine (PFE) image handles the data plane.
Getting this image to "work" involves careful configuration of virtual resources and specific connectivity between the RE and PFE nodes. 1. Prerequisites and Resource Requirements
Before deploying, ensure your host machine (whether physical or a GNS3/EVE-NG VM) supports KVM acceleration. The vQFX-RE image generally requires the following minimum resources: Memory: At least 1024 MB RAM. CPU: 2 vCPUs are recommended for stability.
Disk Format: .qcow2 (the standard for QEMU-based emulators). Juniper vQFX on GNS3 - Brezular's Blog
To get the Juniper vQFX 20.2R1.10 (vqfx-20.2R1.10-re-qemu.qcow2) working correctly, you must pair it with its corresponding Packet Forwarding Engine (PFE) image. Unlike typical routers, the vQFX is a split-architecture virtual switch where the Routing Engine (RE) handles the control plane and the PFE handles the data plane. Core Components Required RE Image: vqfx-20.2R1.10-re-qemu.qcow2.
PFE Image: vqfx-20.2R1-2019010209-pfe-qemu.qcow (often bundled with the 20.2 download).
Note on Versioning: Even if the filename says 20.2, running show version within Junos may report 19.4R1. This is a known labeling discrepancy from the Juniper portal. Basic Configuration Steps Guide: Importing Juniper vMX and vQFX into CML2.4
Unlike standard virtual routers (like vMX or vSRX), the vQFX architecture is split into two distinct components. The file name usually indicates this is the RE (Routing Engine) component.
Note on the filename: The string reqemu implies this is the Routing Engine image compiled for QEMU/KVM environments.
set system services extension-service request-response grpc
set system services extension-service notification grpc
set services analytics streaming-server collector-1 address 192.168.122.10 port 50051
set services analytics sensor group interfaces
This post explores possible meanings, uses, and handling steps for the opaque string "vqfx202r110reqemuqcow2". Whether you found it in logs, a filename, a URL, or as part of a codebase, here’s a concise guide to investigating and working with it.
Cause: Incomplete image build (user overlay missing).
Fix: Re-extract from official .tgz distribution:
tar -xzvf vqfx-20.2R1.10.tgz
qemu-img convert -O qcow2 vqfx.raw vqfx202r110reqemuqcow2
#!/usr/bin/env python3 # placed in /var/tmp/auto_telemetry.py from jnpr.junos import Device from jnpr.junos.utils.config import Config
dev = Device(host='localhost', user='root', password='') dev.open() with Config(dev, mode='private') as cu: cu.load('set services analytics streaming-server collector-1 address 192.168.122.10', format='set') cu.commit() dev.close()
Turn this into a repeatable feature package:
vqfx-feature/
├── Dockerfile # Build virt-customize env
├── patch.xml # Juniper commit script
├── telemetry.py # Post-boot telemetry script
└── apply_feature.sh # Wrapper to patch QCOW2
Example apply_feature.sh:
#!/bin/bash
cp vqfx202r110reqemuqcow2 vqfx202r110reqemuqcow2-custom
virt-customize -a vqfx202r110reqemuqcow2-custom \
--upload telemetry.py:/var/tmp/ \
--run-command 'chmod +x /var/tmp/telemetry.py' \
--run-command 'echo "@reboot root /var/tmp/telemetry.py" >> /etc/crontab'