To legally obtain Cisco IOS images, you generally need a Cisco account with an active service contract. Spiceworks Community Cisco Modeling Labs (CML)
: This is the current and preferred method for getting modern Cisco images (like IOSv, IOSvL2, and ASAv) for GNS3. You can purchase a subscription at the Cisco Learning Network Store Physical Hardware Extraction download cisco ios image for gns3
Once you have the image file, follow these steps to add it to your environment: Open GNS3 and go to Edit > Preferences For Dynamips (Legacy) : Navigate to IOS Routers > New and browse for your image file. For CML/VIRL Images : Navigate to Qemu VMs > New or use the GNS3 Marketplace templates for a guided import. To legally obtain Cisco IOS images, you generally