Path establishment method and controller

A network device, applied as a target branch node along a point to multipoint traffic engineering (P2MP TE) path, the network device comprising:

• a memory storing instructions;
• and
• a processor coupled to the memory and configured to execute the instructions to cause the network device to:
• receive, from a controller, first information comprising a label of the target branch node;
• generate a multicast forwarding entry based on the first information, the multicast forwarding entry comprises second information about a first path from the target branch node to the at least two tail nodes;
• and
• forward, by using the multicast forwarding entry, a packet comprising the label.

A non-transitory computer-readable storage medium storing instructions for forwarding packets for a target branch node along a point-to-multipoint traffic engineering (P2MP TE) path, the instructions, when executed by a computer, cause the computer to carry out steps comprising:

• receiving, from a controller, first information comprising a label of the target branch node;
• generating a multicast forwarding entry based on the first information, the multicast forwarding entry comprises second information about a first path from the target branch node to at least two tail nodes;
• and
• forwarding, by using the multicast forwarding entry, a packet comprising the label.