One of the most commonly used software to prepare for the Cisco exams is GNS3. To use network devices such as Router, Switch on the GNS3 emulator, you must download Cisco images.
Download Cisco IOS for GNS3. All versions are tested and are working with the latest version of GNS3. Note If no Cisco IOS image is loaded on the Cisco 3745, the router enters ROMMON mode, and the system LED blinks. Messages begin to appear in your terminal emulation program window. Caution Do not press any keys on the keyboard until the messages stop.
GNS3 Supported Cisco Router IOS Images Download
GNS3 is more specific and professional than Cisco Packet Tracer. There is no need to add any Cisco devices to the Packet Tracer, but it is absolutely necessary to download and add the Cisco IOS for GNS3.
You need to use GNS3 to use the actual Router and Switch IOS images. With this software, you can emulate a Cisco Router/Switch and prepare for Cisco exams in a more professional way.
You can download and use the most suitable Cisco images to avoid problems when using the network simulator. You can also check out this article to install GNS3 on your computer.
You also need to configure Minimum RAM when adding a Cisco Router or Switch images to the program.
If you set a value that is greater than the minimum RAM requirement, you will put more load on your computer’s processor and experience performance issues.
If you have a powerful PC, you can also set a higher RAM value for Cisco Routers.
When adding a Router to the simulator software, an IDLE-PC value is also determined. The IDLE-PC value is determined by the hardware specifications of your computer so that the routers you add can work more efficiently.
The running IOS images you can use on GNS3 are the c3640, c3660, c3725, c3745, and c7200 versions.
Here are a few additional Cisco Router images. For example, if you use a c1700 series Router, it will be insufficient because it does not support some features when you create a more advanced network topology.
Download Router Image for GNS3
You can download Router images for GNS3 by clicking on the links in the table below.
| Model | IOS Version | File Name | Minimum RAM | Link |
| c1700 | 12.4.25d | c1700-adventerprisek9-mz.124-25d.bin | 128 MB | Download |
| c1700 | 12.4.15T14 | c1700-adventerprisek9-mz.124-15.T14.bin | 160 MB | Download |
| c2600 | 12.4.25d | c2600-adventerprisek9-mz.124-25d.bin | 128 MB | Download |
| c2600 | 12.4.15T14 | c2600-adventerprisek9-mz.124-15.T14.bin | 256 MB | Download |
| c2691 | 12.4.25d | c2691-adventerprisek9-mz.124-25d.bin | 192 MB | Download |
| c2691 | 12.4.15T14 | c2691-adventerprisek9-mz.124-15.T14.bin | 256 MB | Download |
| c3640 | 12.4.23 | c3640-a3js-mz.124-23 | 128 MB | Download |
| c3660 | 12.4.19 | c3660-a3jk9s-mz.124-19.bin | 192 MB | Download |
| c3725 | 12.4.25d | c3725-adventerprisek9-mz.124-25d.bin | 128 MB | Download |
| c3725 | 12.4.15T14 | c3725-adventerprisek9-mz.124-15.T14.bin | 256 MB | Download |
| c3745 | 12.4.25d | c3745-adventerprisek9-mz.124-25d.bin | 256 MB | Download |
| c3745 | 12.4.15T14 | c3745-adventerprisek9-mz.124-15.T14.bin | 256 MB | Download |
| c7200 | 15 | c7200-adventerprisek9-mz.152-4.M7.bin | 512 MB | Download |
| c7200 | 12.4.25g | c7200-a3jk9s-mz.124-25g.bin | 256 MB | Download |
| c7200 | 12.4.24T5 | c7200-adventerprisek9-mz.124-24.T5 | 256 MB | Download |
How to Add Router Image ⇒ Video
After downloading one of the iOS images to your computer, you can watch the video below to add the image file to the Graphical Network Simulator-3 and also subscribe to our YouTube channel to support us!
Final Word
In this article, we have shared the most appropriate Cisco images for you. These images have been used and tested on various projects. Thanks for following us!
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