For older routers (1700, 2600, 3600, 3700, 7200), you don't need .qcow2 . You need to uncompress the .bin into a .image file so the emulator can boot it faster and use less RAM.
set default=0 set timeout=5
Converting a Cisco .bin file to a .qcow2 format is a common task for network engineers wanting to run Cisco IOS images in virtual labs like , EVE-NG , or PNETLab . The Conversion Process
What is the of the Cisco file you downloaded? Share public link convert cisco bin to qcow2
Cisco .bin files are often hardware-specific. Standard IOS images for physical switches (like a Catalyst 3750) generally as .qcow2 images because they lack the necessary x86 drivers. For virtualization, it is highly recommended to use IOSv , IOS-XRv , or ASAv images specifically designed for virtual environments.
By following these steps and tips, you should be able to successfully convert a Cisco BIN file to QCOW2 format and take advantage of the benefits offered by virtualization.
qemu-img convert -f vmdk -O qcow2 source_image.vmdk target_image.qcow2 Use code with caution. Copied to clipboard : Specifies the source format. -O qcow2 : Specifies the output format. 3. Compress for Efficiency (Optional) For older routers (1700, 2600, 3600, 3700, 7200),
unzip -p nxos.bin > extracted_image
For users who need to an ASA firmware .bin file (for debugging or research purposes) and then run it, the asafw toolset from NCC Group provides powerful scripts. This is not a simple “conversion” to QCOW2, but rather a deep extraction and repackaging process that can create custom firmware images.
Converting a Cisco .bin to qcow2 is a multi-step process that essentially the Cisco binary inside a bootable virtual disk. While not as simple as a format conversion, the result enables seamless integration into modern hypervisors. The Conversion Process What is the of the
: Use the QEMU disk image utility to change the raw output into a .qcow2 format:
Check the console type settings in your simulation tool (VNC vs. Telnet).
| 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 |
If you have a compatible virtual disk image (like a .vmdk or a "raw" disk) that you need to convert to .qcow2 , use the utility: