Patent ID: 9191308
Filing Date: 2015-11-17
Classification: H04L

Abstract:
1. A method for determining a beginning node and an end node in a forwarding adjacency label switched path (FA LSP), applied to a multilayer network using an higher-layer signaling triggering model to establish the FA LSP, wherein, the method comprises: a path compute element, when a computed service path comprises FA LSPs of one or more layers, encapsulating path information of the FA LSP of each layer into a Secondary Explicit Route Object (SERO) respectively to return together with service path information through inquiry response message to a beginning node in a first layer initiating the inquiry; a node in the service path receiving the inquiry response message or a path message sent from an upstream node, determining whether the node is a beginning node in the FA LSP of a certain layer according to the path information of the FA LSP included in the SERO, if yes, learning that the FA LSP is an FA LSP of next layer, and determining an end node in the FA LSP of the next layer according to the path information of the FA LSP of the next layer; the node in the service path, after determining that the node is the beginning node in the FA LSP of the next layer and determining the end node in the FA LSP of the next layer, establishing a signaling flow by a standard label switched path (LSP), establishing the LSP of the next layer between the beginning node and the end node in the FA LSP of the next layer, and the node retaining the SEROs encapsulating the path information of the FA LSP other than the SERO encapsulating the path information of the FA LSP of the next layer in the received inquiry response message or the path message into the path message sent to a downstream node in the FA LSP of the next layer.