Vqfx-20.2r1.10-re-qemu.qcow2 Work Jun 2026

| Use Case | Viability | | :--- | :--- | | | ❌ Not recommended. Vulnerabilities, missing features (EVPN-VXLAN enhancements, MACsec). | | Lab / Certs (JNCIP-DC, JNCIE) | ✅ Good. Many training materials still reference 20.2. | | Home EVPN Lab | ⚠️ Limited. 20.2 supports EVPN but has known bugs (BUM flooding, ARP suppression). | | Network Automation Testing (Ansible, PyEZ) | ✅ Yes. Junos 20.2 has stable NETCONF/REST APIs. | | CI/CD Pipeline | ⚠️ Risky. Use latest (23.4+) for CI. |

Runs the Junos OS control plane. It handles routing protocols (OSPF, BGP), user management, SSH/NETCONF access, and configuration management. The file vqfx-20.2r1.10-re-qemu.qcow2 belongs to this component.

Note: For a functional switch, you must also link this instance to a corresponding PFE instance. Benefits of the 20.2R1.10 Release Vqfx-20.2r1.10-re-qemu.qcow2

, while a separate PFE image (Packet Forwarding Engine) manages the data plane. Virtual Performance

: To enable actual traffic flow, the RE must be properly linked to the PFE VM via internal virtual bridges. Juniper Elevate Community Usage Use Cases Lab Testing : Ideal for testing VXLAN/EVPN | Use Case | Viability | | :---

If the communication link is functional, the output will list Slot 0 as Online with the state tracking operational subcomponents. If the status remains Offline , check your virtual cable mappings between the RE and PFE nodes. Essential Initial Configuration Stanza

: Transfer your image to this directory and rename it to the format EVE-NG expects ( virtioa.qcow2 ). Many training materials still reference 20

: A technical walkthrough that details using shell commands to get vQFX images running directly on KVM/QEMU, bypassing higher-level orchestrators if you prefer a manual setup. Key Configuration Tips

Simulates the custom Application-Specific Integrated Circuit (ASIC) data plane. It processes and forwards transit traffic via virtual interfaces.

extension), it can be adapted for Libvirt or Vagrant with some configuration. Cisco Learning Network Key Technical Insights Version Discrepancy Alert : There are known community reports where images labeled as actually report as version

The file vqfx-20.2r1.10-re-qemu.qcow2 represents a specific version of the vQFX Routing Engine (RE) packaged as a QEMU Copy-On-Write (QCOW2) disk image. This guide provides an in-depth breakdown of this image, its architecture, and step-by-step instructions to deploy it in popular network simulation topologies like GNS3 and EVE-NG. 1. Understanding the vQFX Architecture