Hi all, Just starting out with GNS3 and stumbling a bit:) I've read through a few posts and how to's but not yet found answers to all my issues hence my post. 1) Is is possible to simulate a Cisco 3750 switch of do I need to work with the default ethernet switch provided by GNS3? (I have the IOS) 2) When creating a pix from an IOS, I do not see the option to choose that platform: eg platform C3700 model 3725. There is no option to choose a PIX platform. Hope that makes sense! Greatly appreciate any replies.
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So long ago GNS3 was released and well it was lacking a few features and in my experience quite buggy. However now after a successful kickstarter campaign (which I backed!) they have released v1.x.x Now up to 1.3.6 I will share some of my experience and tips, tricks, etc. Originally (and now) layer 2 switches were somewhat difficult to get going in GNS3. But now thanks to vIOS and the great team behind GNS3 and Qemu it’s easy! At this point I assume you have GNS3 installed and working (I am using 1.3.6 in this tutorial) Firstly you are going to need the vdk, now normally you have to extract it from an all in one image, however because I’m awesome and outlawish I will provide it for you here.
You will need to extract it. Once extracted fire up GNS3. Go into preferences (view Preferences) and click on Qemu VM’s, click New. Select iOSv-L2 from the drop-down list and click next. Name it whatever you like L2-Switch works great, click next.
Select the latest Qemu binary from the list (if you are running 64bit OS I suggest this one). Now the important part, find the vIOS-L2.vmdk that you downloaded from here and extracted. Click finish. You now have a L2 switch with 8 ethernet ports in you Qemu VM’s list!. Start her up and console in, it will take a while to boot and remember you can’t cable anything to it unless its powered off.
You may see some errors whilst booting but it should be fine. And that’s it! You can create as many as you like (as long as you got the RAM, Qemu is a bit of a hog).
I will post how to get a layer 3 switch, an ASA AND I will do a basic getting started with GNS3 tutorial. If you like it, share it! Show some love This article was viewed (54396) times!
What is GNS3? GNS3 Stands for Graphical Network Simulator, an open source free software program that every can use it. You may have come across with the Virtual Machine Vmware, VirtualBox which are used to emulate various Operating systems like windows, Linux, Ubuntu in a virtual environment. Gns3 allows the same type of emulation for various network devices (Router, Switch, Firewall) using their ios image files.
You can emulate various vendors networking devices i.e. Cisco, Juniper etc. Why To use GNS3?
Packet tracer is a good tool for learning but is limited for basic network functions. For professional and expert level you can’t use it for learning and testing on large network topology. For that you can either buy real network hardware which is very costly not everybody can afford it or you can rent rack from the vendors for limited time which is not costly but you have limited time to learn. Thanks to GNS3 team for developing a great network simulator tool by using it you can emulate virtual devices (router, switch and firewall) and implement you lab.
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You can prepare for your certification exams using GNS3. I have completed my certification exams using GNS3 (CCNA R&S,CCNP R&S,CCNA Security, CCNP Security, JNCIA,CCNA voice) How to use GNS3?
For setting up GNS3 for Cisco router and Switch you need to Download and Install GNS3 and also requires Router & Switch IOS.
Here I am listing all the working versions of Cisco IOS which I have tested with the latest version of GNS3. Feel free to download them and use them for your Cisco certifications studies. 1700 –. 2600 –.
2691 –. 3640 –. 3660 –.
3725 –. 3745 –. 7200 (v15) –. 7200p (v15) – Mirror Links: 1. If you face any problem setting it up with GNS3 drop me a message and I will get back to you asap. GNS3 is an open source (GNU GPL) software that simulates complex networks while being as close as possible from the way real networks perform, all of this without having dedicated network hardware such as routers and switches. GNS3 provides an intuitive graphical user interface to design and configure virtual networks, it runs on traditional PC hardware and may be used on multiple operating systems, including Windows, Linux, and Mac OS X.
In order to provide complete and accurate simulations, GNS3 actually uses the following emulators to run the very same operating systems as in real networks:. Dynamips, the well known Cisco IOS emulator.
VirtualBox, runs desktop and server operating systems as well as Juniper JunOS. QEMU, a generic open source machine emulator, it runs Cisco ASA, PIX and IPS. GNS3 is an excellent alternative or complementary tool to real labs for network engineers, administrators and people studying for certifications such as Cisco CCNA, CCNP andCCIE as well as Juniper JNCIA, JNCIS and JNCIE.
Enjoyed this post? Hello Srijit, I’ve been having a hard time using the 7200 image (c7200-advipservicesk9-mz.152-4.S5.bin) in GNS3, and getting my laptop to find a valid Idle PC value. I’ve even tried to download the image for the 7200 from the link you’ve provided above #8. Still getting the message “0xa000 is not a valid Idle PC value”. The only other 7200 image I’ve used and gotten a valid PC value is c7200-jk9s-mz.124-13b.bin, but when using that image, I’m getting some odd results when configuring various things such as GRE tunnels. Can you assist me with this?
Hello Sir, I have downloaded the image for 7200. However, in GNS3 when I do show flash on the router I get the following message – R1#show flash Open device slot0 failed (No such device) (Try device DISK: for ATA media.) R1#show disk0 No files on device 67104768 bytes available (968 bytes used) R1#show file system File Systems: Size(b) Free(b) Type Flags Prefixes – – opaque rw system: – – opaque rw tmpsys: – – opaque rw null: – – opaque ro tar: – – network rw tftp: – – opaque wo syslog: 554 nvram rw nvram:. 78 disk rw disk0: – – disk rw disk1: – – flash rw slot0: flash. Dear Manica, Can you try the steps: 1) change directory to flash: cd flash: Rack1SW3#cd flash: Rack1SW3#dir 2) erase flash: Rack1SW3#erase flash: Erasing the flash filesystem will remove all files!
confirm Erasing device eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee erased Erase of flash: complete 3) Squeeze flash: Rack1SW3#squeeze flash: Squeeze operation may take a while. confirm Squeeze of flash complete Rack1SW3# 4) Try to create vlan again Rack1SW3(config)#vlan 3 Rack1SW3(config-vlan)#exit Rack1SW3(config)#int vlan 3 Rack1SW3(config-if)# To me, resolve my problem.
I’ve been getting questions about switches in GNS3 so decided to write this article explaining which switching protocols you can or cannot use in GNS3. First of all, it’s impossible to run switches in GNS3! That being said the option that we do have is using the NM-16SW switching module in a router which gives us some capabilities.
Now you are probably wondering ‘which capabilities’ so let’s have a look what we can do. You might have noticed that in the newer versions of GNS3 there’s a Etherswitch Router.
This is a Cisco 3725 with the NM-16SW module so only the icon is different. Now let’s see what “switching” options we have. Vlan interfaces: You can create vlan interfaces which can be used as the default gateway for clients. For example interface vlan 10 with IP address 10.10.10.10 and interface vlan 20 with IP address 20.20.20.20. This is the same as you would do on any L3 switch like the 3550 or 3560. Trunking: Trunking is looking good, the only encapsulation type is 802.1Q which is fine (no ISL).
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But you are able to setup a trunk connection just fine. There is no dynamic auto or dynamic desirable mode so now way to lab this. Vlan Trunking Protocol (VTP): VTP is working just like on a switch, you can configure the VTP domain, mode like server / client / transparent, pruning and passwords. Etherchannel: If you want to learn etherchannel you are better off with some real switches, you can enable it but there’s no Lacp or Pagp support. Spanning-Tree: You can learn the basics of spanning-tree, see which ports are in blocking and forwarding mode but don’t expect any fancy stuff.
To be honest you are better of with real switches to study spanning-tree if you ask me. Switched Port Analyzer: Should be possible but to be honest I didn’t fully test it yet. The commands are there so I believe it should work just fine. Storm Control: Storm control is there and seems to be just fine. Quality of Service (QOS): The switch commands for Qos are there like “mls qos” and you can configure the mls qos maps.
This looks cool to me! So what do I think of it?
To be honest I like it a bit better after researching all the commands and what the options are. If you want to play with vlans or vlan interfaces there’s nothing wrong using the NM16-SW module. Trunking is fine, you can do everything that you want as long as you don’t care about ISL.
VTP is the same thing as on a real switch so no need for real hardware here. Etherchannel I don’t like since there’s no Lacp or Pagp support, the same for spanning-treeyou lack a lot of commands and there’s no way to switch to other modes like MST which you can do on a real switch. SPAN is excellent and I also like Storm Control and the Quality of Service commands. So what should you do?
Cisco 3750 Switch Configuration
Get real switches or use GNS3? If you have no budget and are studying for CCNA, just use GNS3. If you do have some money to spend get 2 or 3 Cisco 2950’s and you will have more fun.
Cisco 3750 Switch Ios Images For Gns3
If you are studying for CCNP SWITCH just get yourself a 3550 and a 2950 or something. It’s not too expensive and using a real switch is better. For the CCIEdo yourself a favor and invest in 2x 3560 and 2x 3550 and connect them to a breakout switch or get quad-nics. You’ll be spending a LOT of time studying and it’s better to spend your time at switches than the NM16-SW module. If you want to know all the options for the NM16-SW module check out this article on the Cisco website: Next time i’ll be writing an article how to connect your real physical switches to your GNS3 topology.
So what do you think? Is there anything i’m missing? Please share your opinion in the comments!
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