To use Cisco L2 and L3 images on GNS3, you need to configure IOU.
How to Setup GNS3 IOU on Linux / Ubuntu
In order to be able to use Cisco IOU images on Linux systems, we will install GNS3 with IOU support. Before moving on to the installation, let’s briefly talk about what IOU is and what it does.
What is GNS3 IOU?
IOU (IOS on Unix) is a technology that is similar to Dynamips but uses less. IOU images mimic all the features of a particular Cisco IOS technology.
The IOU is also called the Cisco IOU. IOU images do not require hypervisors to emulate Cisco hardware, and IOU images are much more efficient than Dynamips. In GNS3, the use of IOU uses less system memory and CPU.
As a result, using Cisco IOU images on GNS3 allows you to create more specific network topologies.
How to Configure IOU Supported GNS3 on Linux
First of all, visit Google and download the Cisco IOU L2/L3 images and the CiscoIOUkeygen.py file to your computer.
Then, follow the steps below in order to install GNS3 IOU.