A method of communication performed by a root access point of a set of wireless relay nodes (104, 106, 108, 110, 112, 304), the method comprising: defining a routing table for the set of wireless relay nodes (104, 106, 108, 110, 112, 304), wherein the routing table comprises first identifiers that uniquely identify wireless relay nodes (104, 106, 108, 110, 112, 304) within the set and second identifiers that identify next-hop entities for the wireless relay nodes (104, 106, 108, 110, 112, 304) of the set and wherein the routing table describes the topology of the set of wireless relay nodes (104, 106, 108, 110, 112, 304); initially sending routing table information based on the defined routing table to each wireless relay node (104, 106, 108, 110, 112, 304) of the set, wherein the routing table information is used by the wireless relay nodes (104, 106, 108, 110, 112, 304) for defining a forwarding table for forwarding packets to at least one of the wireless relay nodes (104, 106, 108, 110, 112, 304) of the set, the forwarding table comprises a first identifier of each wireless relay node (104, 106, 108, 110, 112, 304) that is downstream from a given wireless relay node (104, 106, 108, 110, 112, 304) and, for each downstream wireless relay node (104, 106, 108, 110, 112, 304), a next link identifier from the given wireless relay node (104, 106, 108, 110, 112, 304) in the direction of the downstream wireless relay node (104, 106, 108, 110, 112, 304); modifying the routing table if a wireless relay node (104, 106, 108, 110, 112, 304) joins the set, leaves the set, or moves within the set; and sending updated routing table information based on the modified routing table to the wireless relay nodes (104, 106, 108, 110, 112, 304) of the set, wherein said updated routing table information is only sent to a portion of the wireless relay nodes (104, 106, 108, 110, 112, 304) of the set affected by the change. defining a routing table for the set of wireless relay nodes (104, 106, 108, 110, 112, 304), wherein the routing table comprises first identifiers that uniquely identify wireless relay nodes (104, 106, 108, 110, 112, 304) within the set and second identifiers that identify next-hop entities for the wireless relay nodes (104, 106, 108, 110, 112, 304) of the set and wherein the routing table describes the topology of the set of wireless relay nodes (104, 106, 108, 110, 112, 304); initially sending routing table information based on the defined routing table to each wireless relay node (104, 106, 108, 110, 112, 304) of the set, wherein the routing table information is used by the wireless relay nodes (104, 106, 108, 110, 112, 304) for defining a forwarding table for forwarding packets to at least one of the wireless relay nodes (104, 106, 108, 110, 112, 304) of the set, the forwarding table comprises a first identifier of each wireless relay node (104, 106, 108, 110, 112, 304) that is downstream from a given wireless relay node (104, 106, 108, 110, 112, 304) and, for each downstream wireless relay node (104, 106, 108, 110, 112, 304), a next link identifier from the given wireless relay node (104, 106, 108, 110, 112, 304) in the direction of the downstream wireless relay node (104, 106, 108, 110, 112, 304); modifying the routing table if a wireless relay node (104, 106, 108, 110, 112, 304) joins the set, leaves the set, or moves within the set; and sending updated routing table information based on the modified routing table to the wireless relay nodes (104, 106, 108, 110, 112, 304) of the set, wherein said updated routing table information is only sent to a portion of the wireless relay nodes (104, 106, 108, 110, 112, 304) of the set affected by the change.