| 摘要 |
Provided is a method for propagating a maintenance signal that can notify an Ethernet layer as well as a VPWS, which is a multi-protocol label switching (MPLS) layer, that a defect has occurred when the defect occurs in a virtual private wire service (VPWS) network using synchronous digital hierarchy (SDH)/synchronous optical network (SONET) as a physical layer. The method includes the steps of: when a physical defect signal is detected from a physical layer, generating a physical layer alarm indication signal (AIS) and a physical layer remote defect indication (RDI) signal, and transmitting the physical layer RDI signal to a neighbor node in the backward direction of traffic; when the physical layer AIS is detected, generating and transmitting, at an MPLS layer, an MPLS backward defect indication (BDI) signal indicating a backward defect to an ingress node, and generating and transmitting, at an Ethernet layer, an Ethernet AIS to an Ethernet subscriber device connected to an egress node; and generating and transmitting, at the Ethernet subscriber device receiving the Ethernet AIS, an RDI signal indicating a backward Ethernet flow defect to an Ethernet subscriber device connected to the ingress node.
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