1. For a first network controller located at a first domain that manages a logical network spanning a plurality of physical domains including the first domain, a method comprising: upon reconnection to a second network controller located at a second physical domain of the plurality of physical domains after a period of disconnect, receiving a first set of updates indicating modifications to logical network state from the second network controller; reconciling any conflicts between (i) the logical network state stored at the first controller, (ii) the first set of updates received from the second network controller, and (iii) updates received from other network controllers located at different physical domains of the plurality of physical domains; and transmitting a second set of updates to the second controller indicating modifications to the logical network state based on the reconciliation of conflicts.