After years of waiting, Cisco VIRL (virtual internet routing labs) is now available for download:
A quick quote from the site describes nicely what it is:
VIRL is comprehensive network design and simulation platform. VIRL includes a powerful graphical user interface for network design and simulation control, a configuration engine that can build complete Cisco configuration at the push of a button, Cisco virtual machines running same network operating systems as used in Cisco’s physical routers and switches, all running on top of OpenStack.
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