Quote from PocketChange:
CME implements Market Orders with protection.
They publish a chart of bust ranges for all instruments. ES I believe is around 30 ticks and you have 8 minutes from the time of trade to initiate a bust. If you fail to act the trade stands.
To the best of my knowledge even though CME futures experienced the same dip and spike nothing halted.
These rules along with limit down rules seem to work and maintain an orderly market.