This comprehensive guide breaks down exactly what this file is, what its naming convention means, and how to successfully deploy it in your virtual emulation environment. Anatomy of the File Name: Decoded
: Represents the specific software release version. Decoded, this means Junos OS Release 20.2R1.10 . The "R" signifies a mainline release, while the final number indicates the build or spin.
: Ensure nested virtualization is enabled on your host ( kvm-ok ) for better performance.
: If the RE cannot talk to the PFE, verify that your QEMU network configurations (bridges/taps) are connecting the internal ports of both instances correctly. Conclusion
Once uploaded, QEMU requires the primary virtual disk to be named precisely hda.qcow2 . Rename the file via SSH: vqfx202r110reqemuqcow2
vQFX can be resource-intensive. If the RE fails to boot or hangs, try increasing the allocated vCPUs or RAM.
switch, specifically version 20.2R1.10, packaged in the QCOW2 format for use with the QEMU emulator.
: Replicating production bugs or testing upcoming configuration migrations prior to real-world deployment. Deployment and Integration
EVE-NG (Community or Professional), GNS3, or an Ubuntu KVM Host. This comprehensive guide breaks down exactly what this
: Refers to the Juniper Networks virtualized QFX series switch.
This is the "brain" of the switch. It runs the Junos control plane, handling protocols like BGP, OSPF, and EVPN-VXLAN. The Forwarding Engine (PFE/VFP):
: Requires placing the file inside a specifically named directory (e.g., vqfxre-20.2R1.10-heavy/ ) and renaming the file to virtioa.qcow2 .
Whether you are preparing for Juniper certification, developing network automation code, validating EVPN-VXLAN designs, or integrating network testing into CI/CD pipelines, the vQFX provides an accessible, free platform for network innovation. While it has limitations - software-only forwarding, longer boot times, and no official support - its value as a cannot be overstated. The "R" signifies a mainline release, while the
Connect the interface of the RE VM directly to the em1 interface of the PFE VM. This internal link allows control and data plane communication between the two engines. The em0 interface on both VMs is used for out-of-band management.
For comparison, official Juniper vQFX images look like:
: Operates similarly to Eve-NG, leveraging the KVM hypervisor beneath the hood to spawn the node. System Requirements per Instance
What you are using (EVE-NG, GNS3, or native KVM/QEMU) If you have the matching PFE image ready