Download Latest GNS3 images Cisco images IOSv, CSR 1000 Cisco ISE, ACS, ASA, FirePower, Juniper. Cisco L2 switch IOS for GNS3. After downloading this image to your system, you can take a look at the article below to add and run the L2 IOS in GNS3. GNS3 Layer 2 Switch; With this Switch IOS image, you can easily study CCNA and CCNP Switching exams and easily create and configure many projects without purchasing Cisco IOU.
In order to perform CCNA and CCNP hands-on lab exercises, either you need the physical devices or a simulator. Since arranging physical devices, such as Cisco routers and switches is probably not possible for everyone. Fortunately, there are various simulators such as Cisco Packet Tracer and GNS3 that you can use to perform CCNA/CCNP and other hands-on lab exercises. In this post, you will get the direct links to download GNS3 IOS images for Cisco routers, ASA, switches, and even for Juniper routers.
One of the great features of GNS3 simulator is that it allows you to perform real-life hands-on lab exercises. However, you need to download IOS images for GNS3 before you can perform the hands-on lab exercises.
GNS3 IOS Images Downloading Links
We assume that you have already downloaded and installed the GNS3 simulator on your system. If you have not yet worked with GNS3, we would highly recommend you to visit the following links that will guide you how to download and use GNS3. Using GNS3 is not as difficult as people think.
Note: GNS3 IOS images are subject to copyright of the respective vendors. We assume you follow the legal license terms.
You can download GNS3 IOS images for the different devices such as router, switch, and PIX and various platforms such as 2900, 3700, and 7200. After doing a lot of research on the Internet, we have collected the various links to download GNS3 IOS images. Following are the list of some of the common GNS3 IOS images that are freely available to download. [Credit: srijit.com]
Note: Some of the above-mentioned links may not work because it might be possible that their URLs are changed or the IOS images are removed from the hosting server.
Step By Step GNS3 Tutorials
If you are new to GNS3, don’t worry, we have posted a lot of step by step GNS3 tutorials for you. Take a quick look at the following step by step GNS3 tutorials and start to learn from the beginning to advance GNS3 configurations.
Optionally, you can also buy the complete CCNA Routing and Switching (exam 200-125) step by step lab manual guide from the Amazon Kindle Store for the self-study.
Hope, this post helped you to download GNS3 IOS images and to understand other step by step GNS3 tutorials. Please drop your queries in the comment box, if you face any issues. You may also provide your suggestions to improve the article. We would love to hear your valuable feedback too. Please like and share the article, it will not cost you anything.
GNS3 also allows me to test our BGP and OSPF WAN configurations in a test environment before going live:) You can do a little switch emulation by adding a switch module to one of your routers. I also believe Cisco’s packet tracer will also emulate their routers and more importantly their switches? GNS3 offers multiple ways to emulate IOS. For older images, we use and maintain Dynamips; an emulator dedicated to emulate some Cisco hardware. Dynamips can run unmodified IOS images. In the new GNS3 1.4, there is a way to run a second category of switches and routers.
- GNS3 do not support add ISO image of Catalyst switch directory. But we can emulate Catalyst Switch base on ISO of Router. This video will show you how to do. GNS3 do not support add ISO image of.
- GNS3 network simulator has become part of the daily work for many network engineers around the world. It became so popular that it even surpassed other network virtualization training solutions. It all started with Dynamips written by Christophe Fillot in 2005. The software was used for emulation of some of the Cisco IOS on desktop computers.
Vios is Cisco’s paid virtual IOS which supports both L2 and L3 images.
- vios-adventerprisek9-m.vmdk.SPA.156-2.T (Router image)
Download from Cisco
- vios_l2-adventerprisek9-m.vmdk.SSA.152-4.0.55.E (Switch image)
Download from Cisco
Download from GNS3 SourceForge
- Select Available appliances from the All devices drop-down.
- Filter “iosv”
- Drag the Cisco IOSv appliance to the workspace
- Move your vios images to your computers “Downloads” folder. GNS3 will look there for the required files.
- Select your Version to be installed and click Next > Yes > Next > Next > Finish
- Repeat the same steps for your L2 image.
For so long, I’ve heard - as have many of you I’m sure - that GNS3, though a GREAT emulator for Cisco IOS software, is not practical for studying anything related to switching. Routing is handled just fine, but because of the proprietary ASICs in Cisco switches, it is not something that can be easily reverse-engineered, thus GNS3 cannot do it. After all, all routing is essentially done in software in GNS3.
I actually wrote this article in part over a year and a half ago, but these concepts still hold up, and I decided to get it out of drafts and publish because I still believe it’s useful to those looking to get into this industry but don’t have real equipment to play with, as is most often the case.
I’d like to point out a very reasonable solution to this problem. Keep in mind that this will not be the same as having actual switches, because some of the syntax can be quite different, but if you’re vigilant, you’ll be able to interpolate between the syntax shown, and what you can expect on a real switch. These explorations will help a CCNA - and even CCNP - candidate get ready for the concepts they’ll be faced with on the exam.
You’ll notice that you have an “EtherSwitch Router” over to the left on your toolbar. This needs a c3700 image to run, and I selected the following:
Now that there’s an image selected, don’t forget to set an IDLE PC value, as you should with every platform in GNS3 so that your environment can run smoothly. There are walkthroughs all over the web on how to do this.
My main point in writing this article is to get some switches powered on and show you how to do some basic switching tasks on this platform. For that, we need to see a topology. I have thrown this lab together in GNS3:
You may need to enable “Always use manual mode when adding links” under Preferences » General » GUI Settings to pick these specific interfaces.
Gns3 Switch Ios Download
The first thing you need to do to get familiar with what’s going on here, is show the interfaces available:
You notice that there’s 16 interfaces in card 1. These 16 interfaces represent our NM-16ESW module, and is what allows us to perform our switching labs. We will be working with these interfaces (Fa1/0 - 15) to perform switching. The two ports in card 0 (Fa0/*) are not capable of L2, so you cannot make them into switchports.
However, this is still a router and should be treated as such until we sort of….make it a switch. To do that, we enable each interface and make them switchports:
These ports are now active, and are switchports, that is, they now operate at layer 2 rather than layer 3. These devices are now basically Layer 3 switches.
Now that we have functional switches, lets dig into some common switching concepts and see how much we’re able to play with in GNS3:
Spanning Tree is pretty easy. Once switching has been enabled as shown above on all devices, spanning tree operates exactly like one who is familiar with it would expect. The devices run traditional PVST by default, as is made evident by the output of the following:
This shows the spanning-tree information for VLAN 1. There are also vlan-specific spanning-tree configuration commands. What I don’t see, however, is any indication of rapid PVST, or even a way to configure it.
This is because this image does not support RSTP. We now come to a feature that we’re actually unable to lab in GNS3. While this may seem like a downer, I urge you to think about the syntax required for enabling RSTP on traditional switching platforms. Not too difficult, right? Really the only thing RSTP brings from a certification exam perspective is the new port states, which can be studied from a book. If it’s still not enough, this is something you’ll need physical equipment to try.
I don’t view this as a big deal. This DOES allow us to study basic things like port states, STP security features like backbonefast, and the effect of tweaking timers. That’s easily CCNA-level and even CCNP-level concepts.The fact that I can still lab PVST is enough for me, and I don’t feel like I’m missing much not being able to run RSTP. In a real enterprise environment, RSTP is a much preferred option, but since this is just for studying, and since RSTP requires only a single command to configure, we’re not missing much here.
EtherChannel, or “port channel”, is a way of grouping multiple links together for increased bandwidth and redundancy. Let’s see how GNS3 handles this.
Gns3 Switch Emulation Command
Looks like it can be done, but there’s really not much available for us to do beyond simply statically bundling the ports together. We aren’t given the option to enable LACP or PAGP. We are, however, still able to configure the global setting for the hashing mechanism to load-balance traffic on these port channels:
While this is cool and fun to play with, it doesn’t really have a huge impact on Cisco curriculum, as port-channels are a light subject as it is. Good to know this is possible, though.
Like anyone who has actually run a functional network, I despise VTP, but Cisco has deemed it necessary to keep this “feature” in their curricula for the time being. The configuration for VTP is different than on a traditional Catalyst switch, but the bells and whistles are the same, and you can observe the same behavior.
The VTP configuration is found in the same place as the VLAN configuration - in the old VLAN configuration context, which any modern Cisco switch has since moved away from.
As you can see, the concepts are the same, and if you can interpolate between the subtle configuration differences, you can still use this to study for the exam - just make sure you spend some time in front of a real switch for at least a little bit so you can remember the actual context of the commands the exam will be expecting.
We also configure R3 to be a VTP client and see that it receives the new VLAN database revision.
Gns3 Switch Ios Images Download Computer
VLAN 10 made it to R3 with the new configuration revision.
Layer 3 Switching
Gns3 Switch Emulation Download
We’re running all of this in GNS3, which is good for practicing Layer 3 stuff, so who would write a blog post on this topic without addressing Layer 3 Switching?
Let’s change up the topology a little bit. I’ve placed R1 as the center of a now-linear network, where R2 must go through R1 to get to R3.
Gns3 Switch Emulation Software
I placed each port on R1 in different VLANs (access), and assign IP addresses to each SVI:
With IP addresses assigned, it’s time to do our routing. The device is natively a router, so setting up a quick (and lazy) EIGRP configuration is as I expected, and our neighbors came up.
A quick ping from R2 to R3 shows we’ve got end-to-end connectivity.
Gns3 Switch Ios Images Download Computer
Gns3 Switch Ios Images Download Full
In conclusion, we’ve run into a few caveats in dealing with GNS3 for switching labs, but on the whole they are manageable. Do NOT focus on the syntax, refer to real equipment or your curriculum books for that - use these tools for getting familiar with the concepts, and getting a minimal amount of command line syntax. Same as with routing labs - GNS3’s best trait is that it just gets you comfortable with the IOS CLI - something that will serve you well on the exams no matter what.