FIELD: radio engineering, communication.
SUBSTANCE: system includes at least one first area connected through at least one area border node ("ABN") to a second area; each ABN has a first level port connected to each first area and a second level port connected to the second area; each multicast packet forwarded includes a header having a root identifier identifying a root of a multicast tree; a data packet is received at an ABN; in response to receiving a multicast packet at a second level port of an area border node, the root identifier of the multicast packet is analysed and if the multicast packet is to be forwarded to at least one of the first level ports, a different root identifier is inserted into the packet before the packet is forwarded to the first level port.
EFFECT: reduced probability of looping when forwarding packets in a network with multiple areas.
20 cl, 7 dwg
