IOS images are lower in cpu and memory so you can fit more of them in one topology.IOS images are usually run in Dynamips however R+Svms are housed in a virtual machine. What are the differences? Here are the major differences: These are classified as Routing and Switching virtual machines (or R+Svms) for short. In the new GNS3 1.4, there is a way to run a second category of switches and routers. For older images, we use and maintain Dynamips an emulator dedicated to emulate some Cisco hardware. GNS3 offers multiple ways to emulate IOS. If you want to learn more about switching, you probably will enjoy my How to Master CCNP SWITCH book. Keep in mind that you can’t emulate switches in GNS3 so you might need to use real switches for these labs. GNS3 allows you to run a small topology consisting of only a few devices on your laptop, to those that have many devices hosted on. GNS3 is used by hundreds of thousands of network engineers worldwide to emulate, configure, test and troubleshoot virtual and real networks.
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