However, a persistent friction point remains: Cisco distributes its router and firewall software (IOS, IOS-XE, ASA) as proprietary .bin files. These are designed for physical hardware or legacy emulators. To run these images on modern hypervisors (KVM/QEMU), they must be converted into the (QEMU Copy On Write) format.
to launch the IOL binary with the -k (KVM) flag on boot. convert cisco bin to qcow2
Prerequisites
: Create a blank .qcow2 file that will serve as the "hard drive" for the virtual router. Example: qemu-img create -f qcow2 cisco_router.qcow2 1G to launch the IOL binary with the -k (KVM) flag on boot
If you are starting with a VMware-style .vmdk or an .ova (which contains a .vmdk ), you can use the QEMU disk image utility to convert it to .qcow2 . Cisco Modeling Lab IOS Image convert Cisco Modeling Lab IOS Image convert sudo modprobe
sudo modprobe nbd max_part=8 sudo qemu-nbd -c /dev/nbd0 cisco-ios.qcow2 sudo fdisk /dev/nbd0 # Create a single bootable partition sudo mkfs.ext4 /dev/nbd0p1 sudo mount /dev/nbd0p1 /mnt