![]() ![]() How do you build Cisco networks in GNS3? In this video I show you how to download Cisco IOS images (Cisco VIRL images) to run IOSv and IOSvL2 in your GNS3 topologies. The Cisco IOS images follow certain naming conventions and there is a meaning to everything in the image file name. We will use the IOS image 5.bin for Cisco 3725 in this article. GNS3 can emulate a number of different Cisco router models, but we have found Cisco 36 series to be the most stable in GNS3. Step 5 Reload the Cisco IOS Telephony Service by entering reload at the enabled prompt. Follow the instructions to download the image from the tftp server. Step 4 Download the Cisco IOS 12.2(2)XT image to the Cisco IOS Telephony Service by entering the copy tftp flash:/slot0 command at the enabled prompt. 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.
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