1. A method for implementing a logical router in a logical network, the method comprising: receiving configuration data connecting a first logical router to a second logical router, wherein the second logical router comprises a plurality of logical routing components with separate routing tables; and for each of one or more routes configured for the first logical router: adding a route to the routing table of a distributed routing component of the second logical router, the added route having a next hop address of an interface of the first logical router; and adding a route to the routing tables of each of one or more centralized routing components of the second logical router, with the next hop address of the added route being an address of an interface of the distributed routing component that is internal to the second logical router.