CISCO Easter Egg

Bernhard Kroenung wrote:

One of the nice features of a CISCO-Router is the ability to simulate a
crash of the system - just type "test crash" - and they crash happily ever after

This was put in to allow a small handful of engineers in various companies
to load new software into boxes outside the maintenance windows
imposed upon them by misguided but fanatical operations management.

This particular feature saved the Internet on several occasions.