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GNS3 does not come with any Cisco IOS(router)/IOU(switch) firmware due to legal/licensing issues.

I will not cover how to get a hold of Cisco IOU.

This guide is a bit more complicated then integrating Cisco IOS router,

After you get a hold of a Cisco IOU bin file for a Cisco Switch, we can start!

You need to have VirtualBox installed. Then download Cisco IOU VM.ova and import it into VirtualBox.

[UPDATE] I switched to HYPER-V  due  to Windows 10 VirtualBox problems - Check out GNS3 IOU VM on Hyper-V
VboxImport

This should be already configured correctly, but check to confirm. Via "settings".

Vbox-Network_Settings

Fire up the VM and login via UNAME=root PWD=cisco >> ifconfig *confirm its 192.168.56.101*

IOU-VBOXLOGIN

 Navigate to 192.168.56.101:8000 in your browser. You should see this >>

 IOU-SpalshScreen

Click Uploads >> First we are going to upload the licensing file >> Dropdown list "IOU license (iourc) >> browse to file >> upload

IOU-IOURC

If Successfull you will see >>

IOURC-Uploaded

Now to Upload that IOU bin file!

IOU-Upload

If Successful you will see >>

IOU-Uploaded

Note both locations for use in GNS3!

Lets fire up GNS3 and import the IOU.

First go to edit >> preferences >>
GNS3-settings

 Lets add the "remote server" 1st (It should be ready to go, just hit "Add")

Server-Remote-Add

Now bind Local Server

GNS3-LocalServer-Binding

 

Now lets add the Licencing file via IOS on UNIX >> Apply

IOURC-GNS3

FINALLY WE ARE READY TO ACTUALLY ADD THE IOU to GNS3!!

Go under IOS on UNIX >> IOU devices. *Leave it Remote, we added it earlier, and hit Yes to the prompt*

IOU-PATH

Now copy file path from Upload screen earlier >> *If L3 change manually, GNS3 does not auto-detect!*

IOU-PATH2

Now Copy over your new switch and right click >> start

Start-IOU

Now right click >> console

IOU-Console

That's it you are ready to roll!

Note: VM needs to be running if using switch in GNS3. It is the IOU "server" for GNS3. It is not a resource hog though, so don't worry!

If you have issues, try disabling firewall to test, and then changing firewall rules if that is the problem!

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