1. An apparatus comprising a plurality of network units cascaded together, each network unit to include a spillover feature that can be enabled to spill received messages over from the network unit to a next network unit, each network unit to receive a message and the spillover feature to determine whether a condition of the network unit is met, each network apparatus to forward the message without further processing to a next network unit if the condition of the network unit is met, otherwise the network unit to process the message and then modify the message to indicate that the message has been processed and then forward the message onto a next network unit.