Gns3 Ios

Posted : admin On 1/26/2022

Layer 3 IOS image for GNS3 with Switching

GNS3 is one of best and my favorite graphical network simulator use for simulating network topologies and network Labs virtually in your personal computer. So GNS3 provide you the economical way for testing your networking skills at home. For creating topologies in GNS3 you are required the Cisco real IOS images. You need to add these IOS image in GNS3 in order to simulate these IOS for Networking LABS. If you are new to GNS3 and not clear how to use the Cisco IOS with GNS3 you can learn it from given link. Also visit How to use GNS3 step by step.

3725 Switch IOS image

  1. Cisco IOS XRv 9000 appliance - GNS3 Cisco IOS XRv 9000 appliance IOS XRv 9000 (aka Sunstone) is the 1st VM released running the 64-bit IOS XR operating system as used on the NCS-6xxx platform. This appliance requires 4 vCPUs and 16GB of memory to run!
  2. You can easily use real Cisco Switch IOS in the GNS3 program. However, in order to fully utilize the Switches you add, you need to use IOU (IOS on Unix/Linux). What is Cisco IOU? First of all, let me briefly explain what IOU (IOS on Unix) is.

GNS3 crashes if the IOS image used is not compatible; One of the most incompatible and crash prone IOS image is of 2611XM series router; It is a known fact that 2600 series images are not stable with GNS3; Note 2: Once the IOS files have been procured, open them in WinRAR and extract the file; Use this expanded file with GNS3; 2. GNS3 Installation.

Currently GNS3 runs only the routers IOS images, these is not way for direct running of cisco 2900 series IOS images in GNS3. But you can create the switching labs with router IOS image in gns3 by using the NM-16ESW module with router which have the switching features. This NM-16ESW module can be used with Cisco 3700 series IOS.

From here you can download this IOS image for your GNS3. If you need the IOS image for your real router and for your company you need to contact with Cisco, from where you can purchase IOS of your choice. Also you can get Cisco Devices and IOS images from Cisco Partners, you can find the nearest local partner. There is a complete list of partners on

(You may required to sing-in with Gmail to download)

With this IOS you can perform the different switching labs on GNS3, which are as following:

  • VLANs
  • STP
  • VTP
  • Inter-VLan

With this IOS you can use the following Slot in GNS3 as shown in figure.

I have used this 3725 Switch IOS image with latest GNS3 and find no issue with it. You are request to share your experience in case of any problem with this 3725 switch IOS image. Thank you for reading this post, have a good day.. Bye… J

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. I also show you how to add Docker containers to your network.

Gns3 Ios

Cisco VIRL has fantastic images which you can download such as:
– Cisco ASAv – Virtual Cisco ASA Firewall
– Cisco IOSv – Virtual Cisco Router
– Cisco IOSvL2 – Virtual Cisco Layer 2 and Layer 3 Switch (multilayer virtual switch)
– Cisco NX-OSv – Virtual Cisco Nexus Device
– And even more cool devices.

Previous GNS3 GUI Install Video:
Previous GNS3 VM Install Video:

Overview: 0:01
Why do we need the GNS3 VM?: 0:50
Download Cisco VIRL IOS Images: 2:30
Import appliances into GNS3: 4:45
Build Cisco topology in GNS3: 7:15
Change GNS3 symbols / icons: 8:05
Configure Cisco IOS devices: 9:35
Add Docker container to network: 12:44
Save configurations, close GNS3 and restore GNS3: 16:02

GNS3 links:
GNS3 website:
GNS3 GitHub page:
Free Solar-PuTTY:
Free Engineers Toolset:
What is VTX / x86 virtualization?

Cisco VIRL:
VIRL Resource Calculator:
GNS3 Calculator

Free Software:
SolarWinds TFTP Server:
WAN Killer:
Engineers Toolset:
IP Address Scanner:
Network Device Scanner:
Wifi Heat Map:
Wifi Analyzer:
SolarWinds NPM:

Cisco Press Book:
Good O’Reilly Book:

Packet Tracer

10x Engineer
Cisco Devnet Associate

Gns3 Ios Images

CCNP Enterprise
CCNP Security
CCNP Data Center
CCNP Service Provider
CCNP Collaboration
Cisco Certified Devnet Professional
Cisco Certified Network Professional

Linux Professional Institute

Gns3 Iosvl2

#gns3 #eveng #virl