Method and Device for Establishing Multi-Domain Dual-Home Path

A method for establishing a multi-domain and dual-home path, comprising:

• a parent Path Computation Element PCE in a serving network receiving information of a first dual-home path and a computation request of a dual-home separating path of the first dual-home path;
• the parent PCE responding to the computation request, and computing information of the dual-home separating path according to the information of the first dual-home path;
• and
• the parent PCE sending the information of the dual-home separating path to a requester of the computation request, wherein the information of the dual-home separating path is used by the requester to establish a second dual-home path.

A device for establishing a multi-domain and dual-home path, located in a client network, comprising:

• a sending module arranged to send information of a first dual-home path and a computation request of a dual-home separating path of the first dual-home path to a parent Path Computation Element PCE of a serving network;
• a receiving module arranged to receive information of the dual-home separating path responded by the parent PCE, wherein the information of the dual-home separating path is computed by the parent PCE at least according to the information of the first dual-home path;
• and
• an establishment module arranged to establish a second dual-home path according to the information of the dual-home separating path.

A device for establishing a multi-domain and dual-home path, located in a parent Path Computation Element PCE of a serving network, comprising:

• a receiving module arranged to receive information of a first dual-home path and a computation request of a dual-home separating path of the first dual-home path;
• a computation module arranged to respond to the computation request, and compute information of the dual-home separating path according to the information of the first dual-home path;
• and
• a sending module arranged to send the information of the dual-home separating path to a requester of the computation request, wherein the information of the dual-home separating path is used by the requester to establish a second dual-home path.