Patent ID: 8411681

Claim:
A multicasting method in a network including a transport multiprotocol label switching (T-MPLS) network in which first switches are connected, and a wavelength division multiplexing (WDM) network in which second switches and a switch hub are connected, the method comprising: establishing, by using at least one of the first switches, the second switches, and the switch hub, a multicasting path by registering its label switch path (LSP) ID and a label switch router (LSR) ID to an upper node; and replacing, by the first switch, the second switch, or the switch hub on the multicasting path, an LSP ID included in a multicasting signal transferred from the upper node into an LSP ID of a lower node, and multicasting the multicasting signal to the lower node, wherein the first switch multicasts a T-MPLS signal, the switch hub converts the T-MPLS signal into an optical multicasting signal and multicasts the converted optical multicasting signal, and the second switch converts the optical multicasting signal into units of the T-MPLS signals and multicast the same, wherein the establishing of the multicastinq path comprises: requesting, by at least one of the first switches, the second switches, and the switch hub, the establishment of a multicasting path with an upper node by storing its LSP ID and LSR ID in the upper node; storing, by the lower node, the LSP ID and the LSR ID; and establishing, by the first switch, the second switch, or the switch hub, a multicastinq path corresponding to the stored LSP ID and the LSR ID and, at the same time, requesting the establishment of a multicasting path with the upper node.