Recently we started playing around with Cisco’s virtual router, the CSR 1000V, while doing some protocol analysis. We found Cisco offering an BIN file for download (alternatively there is an ISO file which contains a GRUB boot loader and the BIN file, or an OVA file which contains a virtual machine description and the ISO file) and file(1) identifies it as DOS executable
more here..............http://www.insinuator.net/2014/07/cisco-cloud-services-router-1000v-and-the-virtual-matryoshka/
more here..............http://www.insinuator.net/2014/07/cisco-cloud-services-router-1000v-and-the-virtual-matryoshka/