Some embodiments provide a method for configuring a gateway router of a virtual datacenter. The method is performed at a network management component of a virtual datacenter that is defined in a public cloud and comprises a set of network management components and a set of network endpoints connected by a logical network managed by the network management components of the virtual datacenter. The method receives a set of network addresses of the network endpoints. The method aggregates at least a subset of the network addresses into a single subnet address that encompasses all of the aggregated network addresses. The method provides an aggregated route for the subset of network addresses to a gateway router that connects the virtual datacenter to a public cloud underlay network in order for the router to route data messages directed to the network endpoints to the logical network of the virtual datacenter.