: This is the official virtualized Layer 2 switch image from Cisco Modeling Labs (CML) . It is the most stable way to run a Cisco switch in GNS3.

Since the Catalyst 4500 won't work, use these alternatives for full switching functionality: VSS-GNS3 - Cisco Learning Network

(Application-Specific Integrated Circuits) that standard emulators like Dynamips cannot simulate GNS3 Documentation . Because of this, you won't find a functional file for a Catalyst 4500 that works in GNS3 Instead, you should look for the following virtual alternatives to practice Catalyst 4500 features. Recommended Alternatives for Switching