When the NYSE gets deluged, Hunsader says, their quote feed to the Consolidated Quote System (CQS), which is used as part of the National Best Bid and Offer (NBBO) system, gets delayed.
When the exchange is not on the national best bid and offer (NBBO), the mechanism here at the CBOE will flash that order to participants in the marketplace and allow those participants to step up to the NBBO.