Here I am listing all the working versions of Cisco IOS which I have tested with the latest version of GNS3. Show Update as on 14th May 2018 –  All the IOS, IOU, Nexus and other images has been updated, checked and verified with latest GNS3 & GSN3 VM. Download here – https://i.srijit.com/gns3images Feel free to download them and use them for your Cisco certifications studies. Old ones are kept intact for your reference-
Mirror Links: 1. http://bit.ly/CiscoIOSGNS3 2. http://i.srijit.com/CiscoIOS-GNS3-1 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:
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.
Anytime Cisco releases a new IOS image for its network switch (or router), it is recommended that you upgrade it.This article explains 7 easy steps to upgrade IOS image on a cisco switch or router.Since you’ll be upgrading the IOS image, make sure you have physical access to the switch and you are in front of it. Use a console cable to connect to the switch.Please note that the steps given below will be similar to both switches and routers. However this examples shows how to upgrade ios image on a cisco catalyst switch. Verify Current IOS VersionAfter you login, go to enable mode, by entering the enable password. This example uses two cisco catalyst 3750 switches configured in stack mode as shown below. So, while upgrading you should upgrade the image on both the flash cards. # show switchSwitch/Stack Mac Address: 0012.abcd.1234H/W CurrentSwitch# Role Mac Address Priority Version State-.1 Master 0012.abcd.1234 10 0 Ready2 Member 0012.abcd.2345 1 0 ReadyIf you have only one cisco catalyst switch (non stack mode), follow all the steps mentioned in this document, but you’ll be doing it only on one flash card.First, verify the content of the flash cards, using “dir flash2:” command. # dir flash2:c3750-ipbasek9-mz.122-35.SE5.bin# dir flash2:c3750-ipbasek9-mz.122-35.SE5.binAs you see above, both the flash cards contains the current IOS image file, which is version “122.35.SE5”. Verify what version of IOS image your switch is currently running. Most likely this will be same as the current IOS image file that you see in your flash card. As you see below, it is using “12.3(35)SE5” # show verSwitch Ports Model SW Version SW Image-. 1 24 WS-C3750G-24T 12.2(35)SE5 C3750-IPBASEK9-M2 24 WS-C3750G-24T 12.2(35)SE5 C3750-IPBASEK9-M 2. Download Latest IOS Image from Cisco WebsiteDownload the latest IOS image for your cisco websiteGo to cisco.com - IOS Software - Select your Siwtch (for example: Cisco Catalyst Switch 3750G-24T) - Click on “Download IP BASE” - Select the latest version that you want to download (for example: 12-2.55.SE1).While you are on this download page, copy/paste the MD5 given to your system. After we download the IOS image and move it to the switch, we’ll verify the MD5 checksum before installing the image. Delete Old IOS Software Image from FlashSince we’ll be downloading the new ISO image and moving it to the flash card, we need some space. So, delete the current old image from the flash card. # delete /f /r flash2:c3750-ipbase-mz.122.35-35.SE5# delete /f /r flash2:c3750-ipbase-mz.122-35.SE5# dir flash2:# dir flash2:In the above delete command, /f stands for force, and /r stands for recurssive.On a side note, you should be using some software to monitor your switch status. If you are not doing it. Copy the IOS image to Cisco SwitchTo transfer the IOS image from your laptop to Cisco Switch, you should run a TFTPserver on your laptop (or on the system where you’ve downloaded the IOS image).If you are running a TFTPserver on your laptop, and connected to the switch using a console cable, assign a ip-address to your laptop, and put your laptop on the same network as the switch.Copy the ISO image to the flash as shown below using the “copy command”. This will ask you to enter the address of the remote host (which is your laptop in this case), and the source filename that needs to be transferred (which is the ISO image you downloaded from cisco website). Download Cisco Ios 15.4 For Gns3# copy tftp flash2Address or name of remote host? 192.168.1.10source filename? C3750-ipbasek9-mz-122-55.SE1.binDestination filename? C3750-ipbasek9-mz-122-55.SE1.binOnce you’ve copied it, make sure the file is there on the flash card. # dir flash2:c3750-ipbasek9-mz-122-55.SE1.binJust to make sure nothing went wrong during the copy, do a MD5 check-sum on this, and compare with the MD5 that you noted down from cisco website while downloading the IOS image. To create MD5 checksum of a file in Cisco catalyst switch, use the “verify” command as shown below. # verify /md5 flash2:c3750-ipbasek9-mz-122-55.SE1.binIf you are running two switches in stack configuration, do the same on the second flash card. # copy tftp flash2:# dir flash2:# verify /md5 flash2:c3750-ipbasek9-mz-122-55.SE1.bin 5. Modify Switch Boot path-listNow it is time to tell switch cisco to use the new ISO image to boot from. Before changing the boot information, verify the current configuration, and change it using the “boot system” command as shown below. # show boot# config t# boot system switch all flash:c3750-ipbasek9-mz-122-55.SE1.bin 6. Save Config and Restart the SwitchVerify the current boot information, save the current configuration, and reboot the cisco switch as shown below. # show boot# write mem# reload 7. Final Verification after IOS UpgradeFinally verify the current IOS version of the switch, after the upgrade, it should display the new version as shown below. # show verSwitch Ports Model SW Version SW Image-. 1 24 WS-C3750G-24T 12.2(55)SE1 C3750-IPBASEK9-M2 24 WS-C3750G-24T 12.2(55)SE1 C3750-IPBASEK9-MMake sure to verify your interface and vlan status, to make sure everything is running properly without any issues. Hi Ramesh,Thank you for your steps.I am trying to upgrade Cisco IOS on my 3750. Recovery ProcedureThanks man, i fu. up my switch with the wrong IOS image 3750X (my fault) and the switch was not able to boot. So if anyone doing a force upgrade with the above method and found that switch or router is not booting up please follow the recovery procedure here:1. The original image must be present in the flash unless it is specifically deleted2. For step 5 if you are using an older IOS the commands do not work. Here is a sample command output of what did on a 12.1 IOS taken from Cisco2950#conf t2950(config)#boot system flash:c2950-i6q4l2-mz.121-13.EA1.bin2950(config)#end2950#2950#sh bootBOOT path-list: flash:c2950-i6q4l2-mz.121-13.EA1.bin!— output suppressed —!— The boot system statement does not show up in the configuration.!— Issue the show boot command to verify whether the new image!— boots on the next reload of the switch.Issue the wr mem command to save your changes and reload the switch. Here is a sample command output:2950#wr memBuilding configurationOK2950#reloadProceed with reload? How do I download Cisco IOS images from Cisco?In order to download images from Cisco website you need the following:. Have a valid Cisco ID.. Have a Smart net contract on that equipment associated to your Cisco ID.. Log in to Cisco Website, search for your equipment model, and download the image.. Use TFTP to copy the image to the Cisco Equipment.. How import IOS switch to GNS3?After downloading the IOS image file, open GNS3, click Edit and click Preferences. Navigate to the Dynamips -> IOS routersoption in the left pane and click the New button in the right pane. Select the New Image option, click the Browse button and select the downloaded IOS image file.
How install Cisco IOS in GNS3 VM?STEP 1: Open the GNS3 VM. Navigate to Edit > Preferences > Dynamips > IOS routers. STEP 2: Click on the “New” button and select “New Image”. STEP 3: Select the downloaded image of the router to install on GNS3 VM by clicking on “Browse”.
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