You can extract IOS images from physical Cisco routers you already own by copying the file from the device's flash memory to a TFTP server. Supported Image Types in GNS3
If you have an active service contract (SmartNet) for specific hardware, you can download files directly from the Cisco Software Download Physical Hardware:
High-performance virtual images extracted from CML/VIRL. These are the most stable for modern labs. Dynamips (Legacy): download cisco ios image file for gns3
images (e.g., Cisco 7200, 3725) that run via emulation. These are resource-intensive and increasingly rare. Cisco IOL (IOS on Linux): Lightweight images often found in the refplat.iso How to Add the Image to GNS3 Once you have the file, follow these steps to use it: Open GNS3 and go to Edit > Preferences IOS Routers (for Dynamips) or (for IOSv/CML images). to select your downloaded image file.
on the GNS3 Community forum to choose the right image type for your PC's performance. You can extract IOS images from physical Cisco
To legally download Cisco IOS image files for GNS3, you must obtain them directly from Cisco, as these files are copyrighted and not provided for free by GNS3 Spiceworks Community Official Sources for Cisco Images Cisco Modeling Labs (CML):
GNS3 supports several types of Cisco images, each with different performance levels: IOSv & IOSv-L2: Dynamips (Legacy): images (e
, so I can recommend the best image versions for those labs?