The .qcow2 extension is critical. It is the native disk format for QEMU/KVM and offers:
If you encountered vqfx202r110reqemuqcow2, you are likely looking at a ready-to-use vQFX virtual appliance for KVM.
vqfx202r110reqemuqcow2 most plausibly denotes a QEMU/KVM-ready QCOW2 image of a Juniper vQFX virtual switch for a 20.2R1.10-style release. It’s useful for lab and testing environments where running virtual network appliances is needed. Treat it like any third-party virtual appliance: verify integrity, follow vendor boot recommendations, and run in appropriately isolated environments. vqfx202r110reqemuqcow2
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It looks like you’re referencing a specific QEMU QCOW2 image file name, likely for a virtualized Juniper vQFX switch (a virtual Routing Engine for EVPN/VXLAN labs). If you encountered vqfx202r110reqemuqcow2 , you are likely
Based on the naming convention, here’s a complete setup and usage guide for:
vqfx202r110reqemuqcow2
show version
show interfaces terse
show configuration | display set
request system reboot
request system zeroize
| Pros | Cons | | :--- | :--- | | High Fidelity: Runs real Junos code, not a simulation. | Resource Heavy: Requires significant RAM and CPU per node. | | EVPN-VXLAN Support: excellent for Data Center labs. | Slow Boot: Takes several minutes to become "ready." | | qcow2 Format: Easy to deploy in KVM, EVE-NG, and GNS3. | Dataplane Limits: Not suitable for throughput testing. | | Free Labbing: Great for certification prep (JNCIP/JNCIE). | No Physical Ports: You cannot connect physical cables to it (obviously). |
cli
configure
set system root-authentication plain-text-password
New password: <set>
Retype password: <set>
set system services ssh
commit
exit
vQFX requires two VM instances (vQFX1 + vQFX2) for spine-leaf testing. show version show interfaces terse show configuration |
mkdir ~/vqfx
mv vqfx202r110reqemuqcow2 ~/vqfx/
cd ~/vqfx
The Juniper vQFX is the industry-standard virtual appliance for network engineers working in Juniper environments. It is highly valued because, unlike the vSRX (which is a firewall), the vQFX accurately simulates a data center switch, including Layer 2 protocols (STP, LACP) and EVPN-VXLAN features. It is the backbone of the Juniper vLabs and Juniper Cloud Crawler environments.