As we all know, provides the emulation of Cisco hardware so we can run the Cisco IOS (Internetworking Operating System) and learn most of the networking concepts without buying an expensive Cisco equipment. This was a boon not only for guys preparing for but also for seasoned professionals who want to test their network design and configuration before rolling on to the production network. Over the years GNS3 has evolved in terms of its performance, flexibility and user interface. Originally designed to emulate Cisco router hardware through Dynamips, and through its VM support GNS3 can run,,,,,, and more. Furthermore, GNS3 can also run Cisco IOU (IOS for Unix) operating system which will unlock boundless possibilities inside GNS3.

What is Cisco IOU? IOU stands for IOS for Unix, a special operating system developed by Cisco to run on Unix (and hence Linux). While IOS runs only on Cisco embedded hardware, IOU on the other hand runs on the generic PC architecture such as x86. Cisco uses IOU to provide its engineers to develop, test and debug IOS which will then get ported (cross-compiled) on to the Cisco native hardware architecture. Here’s what differentiates IOU on GNS3 from the conventional IOS powered routers: • With Dynamips, the GNS’s internal Cisco hardware emulator, actual IOS images that run on the real Cisco routers are executed. This approach is resource intensive. Only few routers can be added before your PC hangs since each router is equivalent to running a VM (Virtual Machine).

• By using Cisco IOU, the Linux virtualization, only one instance of VM servers several devices. The performance is great and fluid. You can add 100+ devices with very low memory utilization. • Another imperative reason for using IOU is that you can run different L2 and L3 images on the IOU VM and gain access not only to routers (as with Dynamips) but also to switches. This is particularly important for CCNP-Switch exam aspirants. Let’s jump in and bring IOU to GNS3. Since IOU images are used by Cisco for its internal research and not yet been released for public usage, I can’t give you the direct links to download it.

Jul 25, 2015 Cisco IOS on Unix, also known as Cisco IOU, is released for internal Cisco use only. Tap Touche 5.5 Keygen. IOU permits to run IOS natively on x86 platform while GNS3 must. We found a really weird issue with a version of IOS on our Cisco 3750 stack. A stack of five 3750 switches was created and configured for one switch to be master of. Also you could use the IOU (IOS on Unix) More reference in GNS3. A cisco L2 switch, you can use the IOS image 'c2691.