Distributed multicast logical router

A non-transitory machine readable medium storing a program for a first managed forwarding element (MFE), that when executing on a set of processing units on a first host computer implements a logical network, a program comprising sets of instructions for:

• sending a multicast group query to a set of data compute nodes (DCNs) executing on the first host computer that are logically connected to the logical network, wherein the multicast group query directs each DCN that receives the query to identify a set of multicast groups of interest to the receiving DCN;
• receiving multicast group reports from a subset of the set of DCNs, wherein at least one of the multicast group reports specifies a multicast group of interest to the DCN from which the report is received;
• distributing, to a set of MFEs executing on other host computers that implement the logical network along with the first MFE, a summarized multicast group report specifying a set of multicast groups of interest to the first MFE;
• wherein the first MFE receives a set of summarized multicast group reports from the set of MFEs executing on other host computers, each summarized multicast group report specifying the multicast groups of interest for a sending MFE that is in the set of MFEs and that executes on one of the other host computers;
• and
• wherein the set of summarized multicast group reports are used to generate, at the first host computer, an output list identifying the MFEs interested in particular multicast groups.