: Stands for "Virtual IOS." This is a version of Cisco's operating system specifically designed to run as a Virtual Machine (VM) rather than on physical hardware.

: Unlike heavy XRv or CSR1000v images that require 4GB+ of RAM, the VIOS L3 image typically runs smoothly on 512MB to 1GB of RAM . This allows users to run dozens of nodes on a single laptop.

: The 15.7(3)M3 release is known for being stable within virtualized environments, suffering from fewer "ghost" bugs than older 15.2 or 15.4 versions. How to Download vios-adventerprisek9-m.vmdk.spa.157-3.m3

: You can use the built-in CML/VIRL appliance templates to import the image and start labbing instantly. A Note on Security and Licensing

Inside this ISO, you will find the .vmdk and .qcow2 files for VIOS (Layer 3) and VIOS-L2 (Layer 2).