for your platform (e.g., a base IOS-XE csr1000v.qcow2 ).
Before starting, determine which category your image falls into:
Configure a startup script (such as a systemd service or an /etc/rc.local entry) inside the virtual machine to execute the Cisco binary automatically upon boot. Step 3: Clean and Compress the QCOW2 Image
Step 1 — Identify what's inside the BIN
Physical Cisco .bin files expect real physical hardware (ports, ASICs, specialized processors). Wrapping that .bin file into a .qcow2 disk does not create the necessary hardware emulator for it to boot on your computer.
: Run file <filename> to identify the actual file type. If it’s a Cisco firmware package ( file will typically identify it as a compressed archive or data file), conversion is not appropriate.
How to Convert Cisco BIN Images to QCOW2 for Virtualization (EVE-NG, GNS3, CML)
You cannot use standard disk conversion tools like qemu-img convert directly on a physical Cisco .bin file. Doing so will result in a corrupted virtual disk that cannot boot because a standard x86 hypervisor cannot natively execute code compiled for physical Cisco hardware ASICs.
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.
QCOW2 (QEMU Copy‑On‑Write version 2) is the native disk image format used by QEMU, KVM, Proxmox, EVE‑NG, and CML. A QCOW2 file represents a : a block‑by‑block image of a disk that a virtual machine can boot from directly. Unlike a firmware bundle, a QCOW2 image expects standard PC hardware (BIOS/UEFI, VirtIO or IDE storage controllers) and is booted by QEMU’s emulated x86 environment.
This will create a raw disk image file named <your_bin_file>.raw .
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Secure the native .qcow2 files directly from the Cisco Software Central portal under the CML download section.
. For virtual appliances (ASAv, CSR1000v, IOSvL2, NX‑OSv), Cisco provides official QCOW2 images through the Software Download portal or CML subscription. These are ready to use – no conversion required.
Extract vmlinuz and iosxe-rootfs .
For many classic Cisco platforms (like IOS routers), the .bin files run on top of hypervisors like Dynamips, which do not use QCOW2. However, for Cisco's modern virtualized operating systems (IOS-XE, IOS-XR, NX-OS), Cisco provides native virtual images ( .qcow2 , .vmdk , or .ova ).
# Rename to .zip if necessary, or use redirection tools depending on the iOS version unzip -p c3725-adventerprisek9-mz.124-15.T14.bin > c3725-raw.image Use code with caution. Step 2: Create a Micro-Hypervisor Disk Create a blank QCOW2 image.
