Cisco IOS images for Dynamips
Yaser Rahmati | یاسر ر
GNS3 offers multiple ways to emulate IOS.
For older images, we use and maintain Dynamips;
An emulator dedicated to emulate some Cisco hardware.
Dynamips can run unmodified IOS images.
In the new GNS3 1.4, there is a way to run a second category of switches and routers.
These are classified as Routing and Switching virtual machines (or R+Svms) for short.
Differences between IOS images and R+Svms
IOS images are usually run in Dynamips however R+Svms are housed in a virtual machine.
IOS images are lower in cpu and memory so you can fit more of them in one topology.
R+Svms are all vendor Routing and Switching images that are larger in size but can be imported into GNS3 for real world network emulation.
Idle-PC value
This settings will help Dynamips to consume less CPU. It’s specific to each different IOS image.
Recommended images
We really recommend using c3640, c3660, c3725, c3745 and c7200 IOS images.
They have proven to be the most stable in GNS3 provided you use the right amount of RAM and Idle-PC value.
| Series | File name | Proposed idle-PC value |
|---|---|---|
c3640 | ||
c3660 | 0x606071f8 | |
c3725 | 0x60c09aa0 | |
c3745 | 0x602701e4 | |
c7200 |
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