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

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.

Step 3: Define the Virtual Network

Create a bridge for the management network and a dedicated bridge for the switch ports. Vqfx-20.2r1.10-re-qemu.qcow2

7. Comparison with Other vJunos Versions

| Feature | This (vQFX 20.2R1) | vJunos-EVO (24.x) | cRPD (Container) | | :--- | :--- | :--- | :--- | | Data Plane | Separate PFE VM | Integrated | None (route server) | | EVPN-VXLAN | Basic | Full, with multi-homing | Routing only | | Resource Usage | 4 GB RAM + 2 vCPU | 8-16 GB RAM + 4 vCPU | 1 GB RAM | | Startup Time | 5-7 min (RE+PFE) | 2 min | 10 sec | | Recommendation | Legacy labs | New labs, production | Route reflectors | This file is a QEMU disk image for

Step 5: Initial Login

Once booted (wait ~2-3 minutes for the first boot), log in via the VNC console or virsh console vqfx-leaf1. Image won’t boot: confirm qemu-img info shows correct

• Image won’t boot: confirm qemu-img info shows correct format, ensure enough RAM, check console output for kernel/Junos errors.
• Interface naming mismatch: verify NIC model (virtio vs e1000) matches what vQFX expects; adjust virtual NIC types in libvirt/QEMU.
• Performance issues: enable host CPU passthrough (–cpu host), use virtio drivers, increase vCPUs, and tune KVM/kernel network settings.

Considerations

• Troubleshooting tips

  5. Post-Boot Configuration

  Once you start the node in your simulator:

  Step 1: Prepare the Files

  Ensure you have both the RE and PFE images.