Cisco does not provide free IOS downloads for GNS3. To legally obtain images, you typically need one of the following:
The 3750 series belongs to the Catalyst family, which relies on specialized hardware for switching. Best VIRL image for GNS3 - Cisco Learning Network cisco 3750 switch ios image gns3 download
If your employer or personal account has an active service contract (CCO login), you can download official software from the Cisco Software Central . Cisco does not provide free IOS downloads for GNS3
While you may find download links on third-party sites, these are often by Cisco copyright. This guide explains how to legally obtain compatible images and the best functional alternatives for your labs. 1. The Legal Way to Obtain Cisco Images cisco 3750 switch ios image gns3 download