How to Add Cisco IOS to GNS3? – If you don’t know that, no problem. In my Adding Cisco IOS to GNS3 article, I am going to show you how to add IOS to GNS3. First of all, we need to Cisco IOS Images, then by downloading to our computer, them, we can add to GNS3.
Adding Cisco IOS to GNS3

Adding Cisco IOS to GNS3

Adding Cisco IOS to GNS3

Adding Cisco IOS to GNS3 is the start for network design. In order to download the Cisco IOS c7200 for the GNS3 on your computer, you can download from link below.

 
It’s a very easy process to add IOS to GNS3. In previous versions, this was even easier. But GNS3 2.0 Alpha 1 and after, it changed a little its view in the new versions. But, it’s same logic to add IOS to GNS3. Let’s take a step-by-step look to IOS adding process.

Adding Cisco IOS to GNS3 Step by Step

Let’s continue step-by-step to the Adding Cisco IOS to GNS3 topic. Assuming that you have installed the GNS3 program on your computer, run the program as an administrator. After opened the program, it’s same with below. After opening the program, the first view is as follows.

In the opened Setup Wizard window, select the Run only legacy IOS on my computer option.

Adding Cisco IOS to GNS3

After you selected, the Run only legacy IOS on my computer option, click on the Next button. If you don’t want to be shown its, for that is available one option. Click on the Don’t show this again checkbox.

Adding Cisco IOS to GNS3

In the Local Server Configuration window, leave the settings as the default setting. And then click on the Next button.

Adding Cisco IOS to GNS3

In the Summary window, it’s being given the summary of local server configuration. Go on by clicking the Finish button.

Adding Cisco IOS to GNS3

After you clicked, the Finish button, the window will be opened, and then it’s asking to us that where to save the project name and the location. After gave the test name and leave the save locations as default, click on the OK button.

Adding Cisco IOS to GNS3

In the next window, select the Add an IOS Router using a real IOS image (supported by Dynamips) option.

Adding Cisco IOS to GNS3

After you selected, click on the OK button.

Adding Cisco IOS to GNS3

In the New IOS Router Template / IOS Image window, click the Browse button to add the Cisco IOS image you just downloaded from the above link.

Adding Cisco IOS to GNS3

Click on the Open button by showing the location of the IOS image.

Adding Cisco IOS to GNS3

Do you want to unzip us because the Cisco IOS image is compressed? Click on the Yes button to continue.

Adding Cisco IOS to GNS3

The Cisco IOS image is decompressing… Please wait…

Adding Cisco IOS to GNS3

Go on by clicking the Next button after select the Cisco IOS location.

Adding Cisco IOS to GNS3

The Router name appears automatically. If it’s a different model, you can change. Now, click on the Next button.

Adding Cisco IOS to GNS3

Here is an important part. Here, Router’s appears the value of the default RAM specified to work with better performance by default. Perchance, you can change this if IOS you added is of the above or below of value.

This value is generally specified in the text editor inside the directory of Cisco IOS image you downloaded. For the test, here select the 256 RAM value. And click on the Next button.

Adding Cisco IOS to GNS3

In the Network Adapters window, if you want to add any slot to the Router, select from here. After you selected this setting, go on by clicking the Next button.

Adding Cisco IOS to GNS3

The Idle-PC window is an important part. Here, it’s a part specified that won’t force our computer and won’t use %100 to our computer processor for Router. Click on the to the Idle-PC button.

Adding Cisco IOS to GNS3

Your computer is trying to determine the best value for the router. Be patient and wait.

Adding Cisco IOS to GNS3

Wait..

Adding Cisco IOS to GNS3

Go on by clicking the OK button after it’s found the best value for the Cisco Router IOS image.

Adding Cisco IOS to GNS3

Finish the process by clicking the Finish button.

Adding Cisco IOS to GNS3

After added Cisco IOS to GNS3, it appears the IOS Router Templates window in front of ours. Here, after summary information are given, go on by clicking on the OK button.

Adding Cisco IOS to GNS3

The place indicated by the red arrow is the work area. Drag and drop to the workspace by holding with left mouse button the Router that you added to GNS3.

Adding Cisco IOS to GNS3

Click on the right mouse button to run the Router.

Adding Cisco IOS to GNS3

In the opened Router features, click on the Start option. The router is closed now. This, you can see in the Topology Summary section.

Adding Cisco IOS to GNS3

Router started working now. The red icon will turn to the green icon in the Topology Summary section. You need to open the console to config the Cisco Router. After double-clicked with left mouse button on the Router, the command window will open immediately. You have to wait a little time after it’s opened the command window.

Adding Cisco IOS to GNS3

It’s discoverable from the command interface of [R1#] that the Router started completely.

Adding Cisco IOS to GNS3

Let’s take a look at the running configuration with the R1# show running-config command. You can see that it’s the 15.2 version of IOS Image.

Adding Cisco IOS to GNS3

Test Adding Cisco IOS to GNS3

We make started the Router after added the Cisco IOS to GNS3. Now let’s test the availability of the ping command from our physical computer.

In the following figure, I gave the 192.168.1.100 Ip address in the FastEthernet network interface because my physical network is 192.168.1.0/24 Ip block. If you have a different Ip block, you can change the Ip address of FastEthernet like yours.

Apply the instructions in turn;

R1> enable
R1# conf t
R1 (config)# int fa0/0
R1 (config-if)# ip add 192.168.1.100 255.255.255.0
R1 (config-if)# no shutdown

The commands are enough for the test. As you type to No Shutdown command, as soon as you press the Enter button, FastEthernet0/0 will be from down status to up.

Let’s go on our process by adding one Cloud structure from device section that found in the left section to the workspace to access our physical network after done the Router configuration.

Adding Cisco IOS to GNS3

Drag and drop likewise by holding the Cloud device.

Adding Cisco IOS to GNS3

It will be named automatically as Cloud1. Click the right mouse button on the Cloud1.

Adding Cisco IOS to GNS3

It will be opened the Cloud1 specifications after clicked the right mouse button. Select the Wifi option. If you are connected with Ethernet [RJ-45] to the Internet, from here select the Ethernet. Let’s continue.

Adding Cisco IOS to GNS3

One cable will appear after selected Wi-Fi option. And then, select the FastEthernet0/0 in the Network Adapter windows from the opened window by clicking the right mouse button to connect to the Router. So, select the slot that you gave the Ip address.

Adding Cisco IOS to GNS3

We are coming to last of our test process. Run the Router by clicking the Start button that has in the menu section after clicked to the link.

Adding Cisco IOS to GNS3

In the left section in the following figure, we see of the network interfaces configured with R1# show ip int brief command. The FastEthernet0/0 network interface is [up] status as 192.168.1.100.

In the right section in the following figure, there is the command prompt in our physical computer. I showed the name of my computer from the command prompt. We realized our test process by sending the ping to the Router that we added at GNS3. The Router and our physical computer are able to communicate smoothly.

Adding Cisco IOS to GNS3

Adding Cisco IOS to GNS3 ⇒ Video

  Final Word

I’m pointing to the GNS3 Adding to Cisco IOS topic here. We came to the end with a small test after added the Cisco IOS to the GNS3 Network Simulator program. I hope, this has been a useful article for you. I am going to prepare a useful article about the basic commands.

If this article is helpful, send me feedback by commenting! Thanks in advance, take care of yourself!

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