In this video I show you how to create a basic Cisco network using Cisco Dynamips routers.

This is one of multiple videos showing you how to install the GNS3 Windows GUI on a Windows 10 PC. This video discusses creating Cisco networks in GNS3.

GNS3 offers multiple ways to emulate IOS. For older images, we use and maintain Dynamips; an emulator dedicated to emulate some Cisco hardware. Dynamips can run unmodified IOS images. In the new GNS3 1.4, there is a way to run a second category of switches and routers. These are classified as Routing and Switching virtual machines (or R+Svms) for short. What are the differences? Here are the major differences:

– IOS images are usually run in Dynamips however R+Svms are housed in a virtual machine.
– IOS images are lower in cpu and memory so you can fit more of them in one topology.
R+Svms are all vendor Routing and Switching images that are larger in size but can be imported into GNS3 for real world network emulation

Dynamips: Dynamips is the technology leveraged by GNS3 since inception and emulates Cisco routers and basic switching using the Etherswitch module. It emulates older Cisco hardware such as 3725 routers and uses actual Cisco IOS images. You can copy a supported IOS image from a physical network device and use it with GNS3.

You will need access to either physical hardware or have a Cisco support contract to get an IOS image. GNS3 is unable to provide IOS images for your labs.

Cisco does not support you using IOS images on non-Cisco hardware and you may run into bugs emulating Cisco hardware.

  • David Bombal