Click , select your image, and follow the wizard to set the platform and chassis.

Open GNS3 and go to .

For those who find legacy Dynamips images unstable, modern GNS3 labs often use images. These are official virtual images provided by Cisco:

A virtualized router that supports modern IOS 15 features without hardware emulation bugs.

image is often recommended as the most stable alternative if a specific 2811 image is unavailable, as it is the only Dynamips image still officially supported on Cisco.com . How to Download and Install the Image