Chassis controllers for converting universal flows

A network control system for generating physical control plane data for managing a set of managed forwarding elements that implements forwarding operations associated with a logical datapath set, the system comprising:

• a plurality of host computers, each of the plurality of host computers executing a managed forwarding element;
• a first controller computer comprising (i) one or more processing units, (ii) a memory for storing a first controller instance executable by the one or more processing units of the first controller computer, and (iii) a network information base (NIB) storage, the first controller instance comprising sets of instructions for:
• receiving input data defining the logical datapath set and performing a first conversion of data for the logical datapath set to generate intermediate data tuples for the logical datapath set;
• storing the intermediate data tuples in the NIB storage;
• and
• distributing the intermediate data tuples from the NIB storage to a set of the plurality of host computers that executes the set of managed forwarding elements;
• and
• a second controller instance executing on a particular one of the plurality of host computers, the second controller instance comprising sets of instructions for:
• receiving the intermediate data tuples for the logical datapath set from the NIB storage;
• and
• converting the intermediate data tuples into physical control plane data for use by a managed forwarding element executing on the particular one of the plurality of host computers.