A Cisco .bin file is often a compressed archive containing a bootloader, a Linux kernel (in the case of IOS-XE), and a root filesystem. A QCOW2 file, conversely, is a complete block device image.
You cannot simply rename the file. The .bin must be extracted and repackaged into a virtual disk structure that a hypervisor can recognize as a bootable drive. convert cisco bin to qcow2
Prerequisites:
| Cisco Platform | QCOW2 Conversion Support | Notes |
|----------------|--------------------------|-------|
| CSR1000v (IOS-XE) | ✅ Full | Boot via kernel or bootloader |
| ASAv (ASA on KVM) | ✅ Full | Requires specific OVA → qcow2 extraction |
| vIOS / vIOS-L2 | ✅ Native | Already qcow2 in VIRL/CML packages |
| IOS (7200, 3725) | ⚠️ Partial | Better as -kernel boot, not disk-based |
| NX-OS (Titanium) | ❌ Not supported | Uses different boot architecture | A Cisco
qemu-img create -f qcow2 $QCOW2_OUTPUT $DISK_SIZE
Verify:
qemu-img info $QCOW2_OUTPUT
| If you have... | Recommended action |
| --- | --- |
| Legacy IOS .bin (2500, 2600, 3600, 7200) | Use Dynamips inside GNS3 or EVE-NG. Do not attempt KVM conversion. |
| IOS-XE .bin (CSR1000v) | Download the official .qcow2 from Cisco Software Center. |
| IOL .bin (IOU/L2/L3) | Run natively on Ubuntu with i86bi wrapper, or create a chroot .qcow2. |
| Curiosity & time to hack | Try QEMU’s -kernel boot with serial console; expect 90% failure. | | Cisco Platform | QCOW2 Conversion Support |