Useful Reference URLs are listed as below: Note that your running-config is not saved as start-up config until you click File->Save (it will export config to a local file which is used for config importing for every reloading or power on) after the “write” command under IOS CLI, otherwise you config disappears just after you stop the router and start again in GNS. In order to save all your work in a GNS lab and enable you to work on it later, you need to save it as a project: File->Save Project As, and tick both the checkbox of “ Save nvrams and virtual hard drivers” & “ Save IOS startup configurations”. How to save start-up config, flash & NVRAM of a router in GNS3: So, make sure you download 7206 Router IOS. It is clearly stated that only 7206 platform is supported on GNS3 in below URL. Only 7206 out of 7200 series Routers can be simulated in GNS3: I hope this is informative for you and I would like to thank for reading this article.According to below URL, it is recommended to use 7200 router in GNS with IOS 12.4(24)T which enables you to simulate CME version 7.x, while all other routers with 12.4(15)T allow you to access CME 4.x and older versions. If you are new to gns3 then you can visit the beginner guide here: how to use GNS3 1.3 After adding IOS image in GNS3, click on router sign and drag the router on dashboard.Now click on finish and then click on After this you will see your router in left side of gns3 router section.In this way you can use the multiple routers efficiently. This idle PC value will minimize the CPU usage of your computer.
Click on the idle PC value for select it. One important thing while using adding IOS in gns3 is idle pc value.You can also change the interface in GNS later. Select the default interface types, these interfaces will be added to your device automatically when you use this device in GNS3.But if you have lower RAM then you can change it accordingly. Allocate the RAM for your Cisco device in next step.Select the platform or series of your IOS image, normally it pick up automatically but you can also select manually.It may asked to compress the image, click on yes.Now it asked you to browse the cisco IOS image.
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