On the next screen, go ahead and increase the minimum amount of RAM to 256MB, and click Next >: It will automatically name the device Etherswitch router, and place into the Switches device category, instead of Routers. On the screen where you’re asked to name the router, select the “This is an Etherswitch router” option (this is important!). Choose Yes, as it will load faster, instead of decompressing every time you start the image: You’ll be asked if you’d like to decompress this image. Select New Image, and click Browse to locate the image in your filesystem (you must supply your own!). (You can also run this image via the GNS3 VM) Pick run this IOS image via the local computer, and click Next >: This example will use a c3725 router IOS image, but the same steps apply if using the other three platforms listed above.įirst, click Edit->Preferences->IOS Routers->New in the GNS3 GUI. Refer to the switching section of this document to see what features will be unavailable to you. This is a rather simple process, but be aware that your options for configuring Cisco switching while using a c3640, c3660, c3725, and c3745 for this are quite limited. You can also use switches from other vendors such as Cumulus, Extreme Networks and many more. Use it only for basic operationsīy leveraging GNS3 support for Docker, you can now add Open vSwitch to your GNS3 topologies. It’s not running a switch OS, everything is emulated from scratch. You cannot configure this switch through a CLI, but you can set the number of ports supported on the switch and other basic settings.

Use this if all you need is a basic switch to connect devices in a GNS3 topology. Non-Cisco Unmanaged switching: GNS3 built in switch In addition, as this is a Cisco internal tool, IOU mages may be buggy and no support is available. You will need to get them from someone who works at Cisco. IOU is a less resource intensive alternative to IOSvL2, but the images are not publicly available. Instructions on configuring a c3725 router to act as an “etherswitch router” (or “swouter”), with a few basic instructions are found at the bottom of this document While an Etherswitch module does not support advanced layer 2 features, it does allow you to configure basic VLANs, Spanning Tree and other options. This is the official Cisco way of emulating a switch. With a Cisco VIRL IOSvL2 image, you can configure and test a wide range of advanced switching features. Recommended_switching_platform Cisco VIRL IOSvL2 Your selection of image and platform will affect what is possible. While this was true in the past, GNS3 now supports options such as:Ĭomplimentary campus technologies such as HSRP are also supported. One common misconception about GNS3 is that GNS3 does not support advanced switching options.

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