April 9, 2020

Adding Cisco Router / Switch IOS Image to GNS3 on Ubuntu

After installing the GNS3 program, follow the steps below to add a new Router / Switch IOS image.

After running GNS3, the first opening of the program is as follows. Select Local Server in the Setup Wizard window. After selecting the Local Server option, click the “Next” button.

GNS3 Setup wizard
GNS3 Setup wizard

 

To add a Cisco Router IOS image, select “Add an IOS Router using a real IOS image” from the “Add virtual machines” page.

Add an IOS Router using a real IOS image
Add an IOS Router using a real IOS image

 

In the IOS images window, click the “Browse” button on the “IOS image” page to add the Router image.

IOS image
IOS image

 

In the “Select an IOS image” window that opens, select an IOS image that you downloaded to your computer and click the “Open” button. You can download the cisco image here.

Select an IOS image
Select an IOS image

 

On the “IOS image” page, click the “Yes” button to copy the router IOS image to the default location. After adding the IOS image, click the “Next” button.

default location
default location

 

On the “Name and platform” page, select the Cisco Router platform and click the “Next” button.

Cisco Router platform
Cisco Router platform

 

In the “Memory” page, you can configure how much RAM the Cisco Router will use in this window. Continue by clicking the “Next” button to accept the default 512 MB RAM value.

"Memory" page
“Memory” page

 

You can add interfaces for the Router on the “Network Adapters” page. Select the “FastEthernet” interface configured by default and click the “Next” button.

Network Adapters
Network Adapters

 

You must adjust the IDLE-PC value so that it does not affect the performance of your computer while the Cisco Router is running. Press the Idle-PC Finder button to adjust the optimum value.

Idle-PC Finder
Idle-PC Finder

 

Calculating Idle-PC value for router image.

Calculating Idle-PC value
Calculating Idle-PC value

 

After finding the most suitable Idle-PC value for the router, click the “OK” button.

Idle-PC Finder
Idle-PC Finder

 

Click the “Finish” button to continue the IOS addition process.

Idle-PC Finder
Idle-PC Finder

 

It gives information about the Router image you added in the “IOS Router Templates” window. Just click the “OK” button to close this window.

IOS Router Templates
IOS Router Templates

 

In the new project creation window, after configuring the project name and location, click the “OK” button.

New project
New project

 

After our Cisco IOS image has been successfully added, drag and drop the c7200 Router from the left section to the workspace.

c7200 Router
c7200 Router

 

After running the router, you can see the IOS image version from the image below.

Cisco IOS software
Cisco IOS software

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