Today: Stimulus-response Reasoning


"What happens if I tweak this import policy?"
"Let's just readjust this IGP weight..."
"New customer attachment point? Some cut-and-paste will fix that!"

Some time later, some "strange behavior" appears.
(OOPS!  Revert.)

This is a terrible "programming environment".
Configuration is ad hoc and painful.
Wastes operator time. 
Suboptimal performance, angry customers.