Convert Cisco Bin To Qcow2 May 2026

You cannot directly convert a Cisco .bin to a .qcow2.
Instead, run the .bin via Dynamips (emulation) or replace it with an official virtual Cisco .qcow2 image. The architectural differences between a raw bootable executable and a disk image with a partition table make direct conversion impossible without a hypervisor-specific loader.

If you must get a legacy bin into a KVM environment, your only practical path is to emulate the Cisco hardware inside a QEMU VM—essentially, a hypervisor within a hypervisor—which negates any performance benefits.

Save yourself days of debugging: download the official qcow2 from Cisco for your platform, or use Dynamips for vintage IOS images. Your lab will thank you.

Further Reading:

Have a specific .bin you need to virtualize? Check the file command output first – if it says “ELF 32-bit MSB executable” for PowerPC, stop. You need a PowerPC QEMU target and a lot of luck.

First, check if the .bin is a plain binary or an installer:

file cisco-image.bin

If it says data or x86 boot sector, it might already be a disk image. More often, it will be a compressed archive.

To peek inside:

binwalk cisco-image.bin

If you see gzip or filesystem entries, it’s packed.

Decide on a size (usually 8GB is safe for IOS-XE):

qemu-img create -f qcow2 cisco.qcow2 8G

qemu-system-x86_64 -m 1024 -hda helper.iso -hdb $QCOW2_OUTPUT -boot d -enable-kvm

Inside helper VM:

# Partition /dev/sdb
fdisk /dev/sdb
> n (new partition)
> p (primary)
> 1
> (default start)
> (default end)
> a (make bootable)
> w (write)

Format and install bootloader:

mkfs.ext4 /dev/sdb1
mount /dev/sdb1 /mnt
extlinux --install /mnt
# or GRUB:
grub-install --target=i386-pc --boot-directory=/mnt/boot /dev/sdb

| Step | Tool/Command | |-------------------|----------------------------------| | Create raw disk | qemu-img create -f raw | | Partition & mount | fdisk + losetup | | Copy files | cp | | Install GRUB | grub-install | | Convert to qcow2 | qemu-img convert -O qcow2 | | Test with QEMU | qemu-system-x86_64 | convert cisco bin to qcow2

If you have the specific Cisco .bin filename (e.g., isr4300-universalk9.03.16.08.S.155-3.S8-ext.bin), I can tell you whether it’s directly convertible or requires extraction.

Converting Cisco BIN Files to QCOW2: A Step-by-Step Guide

Cisco BIN files are a type of firmware image used by Cisco Systems for their networking devices, such as routers and switches. These files contain the operating system and configuration data for the device, and are used to upgrade or restore the device's firmware. However, BIN files are specific to Cisco devices and may not be compatible with other virtualization platforms or devices.

QCOW2 (QEMU Copy on Write) is a virtual disk image format used by QEMU, a popular open-source virtualization platform. QCOW2 files are widely used in virtualization environments, such as OpenStack, because they offer a range of benefits, including compression, encryption, and copy-on-write functionality.

In some cases, you may need to convert a Cisco BIN file to QCOW2 format, such as when:

In this article, we will guide you through the process of converting a Cisco BIN file to QCOW2 format.

Prerequisites

Before you start, make sure you have:

Step 1: Prepare the BIN File

The first step is to prepare the Cisco BIN file for conversion. You will need to extract the file's contents, which are typically compressed and encrypted.

You can use tools like binwalk or dd to extract the file's contents. Here, we will use binwalk.

Install binwalk on your Ubuntu-based system: You cannot directly convert a Cisco

sudo apt-get update
sudo apt-get install binwalk

Run binwalk on the BIN file:

binwalk -e <your_bin_file>.bin

This will extract the contents of the BIN file to a directory named _extractor.

Step 2: Create a RAW Disk Image

The next step is to create a raw disk image from the extracted BIN file contents. You can use the dd command to create a raw disk image:

cd _extractor
dd if=<your_bin_file>.bin of=<your_bin_file>.raw bs=1M

This will create a raw disk image file named <your_bin_file>.raw.

Step 3: Convert the RAW Disk Image to QCOW2

Now, you can use QEMU's qemu-img command to convert the raw disk image to QCOW2 format:

qemu-img convert -f raw -O qcow2 <your_bin_file>.raw <your_bin_file>.qcow2

This will create a QCOW2 file named <your_bin_file>.qcow2.

Step 4: Optimize the QCOW2 File

Optionally, you can optimize the QCOW2 file using QEMU's qemu-img command:

qemu-img optimize -f qcow2 <your_bin_file>.qcow2

This will compress and optimize the QCOW2 file.

Step 5: Verify the QCOW2 File

Finally, you can verify the QCOW2 file using QEMU's qemu-img command:

qemu-img info <your_bin_file>.qcow2

This will display information about the QCOW2 file, such as its size, format, and compression.

Conclusion

In this article, we have provided a step-by-step guide on how to convert a Cisco BIN file to QCOW2 format. The process involves extracting the BIN file contents, creating a raw disk image, converting the raw disk image to QCOW2, optimizing the QCOW2 file, and verifying the result.

The resulting QCOW2 file can be used in various virtualization environments, such as KVM or OpenStack, allowing you to virtualize a Cisco device on non-Cisco platforms.

Additional Tips and Considerations

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.

guestfish -a "$QCOW2_FILE" -m /dev/sda1 <<EOF copy-in /usr/lib/extlinux/* /boot/ write /boot/extlinux.conf "DEFAULT cisco\nLABEL cisco\nKERNEL /boot/$BIN_FILE\nAPPEND console=ttyS0" extlinux /boot EOF

echo "Converted $BIN_FILE -> $QCOW2_FILE"

Instead of manual steps, many emulation platforms include tools. For example, GNS3 has a cisco_iosxe_converter:

/usr/local/bin/cisco_iosxe_converter.py \
  --image csr1000v-universalk9.16.12.05.bin \
  --output csr1000v.qcow2

Alternatively, use EVE-NG’s iol or dynamips converters, but those target .qcow2 directly.

If you have a working Cisco VM image (like from CML/VIRL), you can simply convert that to qcow2: If you must get a legacy bin into

qemu-img convert -f raw -O qcow2 cisco.raw cisco.qcow2

There are two primary methods to achieve this conversion: the Automated Script Method (recommended for GNS3/EVE-NG) and the Manual Extraction Method (for understanding or custom configurations).