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One key advantage that Cisco IOU has is that it does not require nearly as much resources that GNS3 and VIRL needed to run. Cisco's “classic” IOS image, it is primarily running on branch office Cisco ISRs, Flexible NetFlow and Network-Based Application Recognition (NBAR) integration to provide layer.

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The GNS3 website and forum is an amazing resource of information, labs and tips, the people on the forum are al there to support each other and help improve the GNS3 and others ability to use it. Here is a link to a post about IOS images. Here's a guide to how Cisco IOS images are named:  Please remember that the Cisco IOS image is a copyrighted piece of intellectual property and so you will need to obtain a way of getting them yourself if you don't have a Cisco CCO log in. I therefore cannot suggest you search the internet using sites like, I don't know, Google, for them as that would be wrong, so I won't do that. Here's a link to the main GNS3 website: The guys at GNS3 are always looking for suggestions and peoples feedback and so your contribution on their forum would be very welcome, especially as someone new to it! Mark9586 wrote: On a GNS3 note, last time I used it (about 4 years ago) on both Ubuntu and Windows, it would max the processor out on the PC with just a handful of routers running. Has that been improved?

For the CPU uusage, you can right click each different router model, and select 'set idle PC', this calculates the best setting and you should really select the vlaue with a *. If a value in the dropdown box doesn't have a *, select a value and then do it again. I can easily run 20 routers with about 30% usage on a 8 core AMD Bulldog motherboard..