1. A method comprising: receiving a first set of routing information from a first datacenter and a second set of routing information from a second datacenter, wherein the first set of routing information is tagged by a first locale identifier and the second set of routing information is tagged by a second locale identifier; generating a set of routing instructions based on the first set of routing information and the second set of routing information, wherein the set of routing instructions use the first locale identifier to identify network resources in the first datacenter and the second locale identifier to identify network resources in the second datacenter; and providing the set of routing instructions to a first set of computing devices in the first datacenter and a second set of computing devices in the second datacenter for jointly implementing a global logical router for performing L3 routing among a first set of network nodes of the first datacenter and a second set of network nodes of the second datacenter.