| 摘要 |
PURPOSE: An apparatus and a method for measuring a transmission delay in an MPLS(MultiProtocol Label Switching) domain are provided to measure a transmission delay time with respect to generated/deleted/changed LSP(Label Switched Path) and CR-LSP(Constraint Based-LSP) by using a probe packet. CONSTITUTION: An operator terminal(100) generates a transmission delay measurement request with respect to one specific path of different LSP paths set between two switch routers positioned at a boundary of an MPLS domain, and receives and displays a response to the request on a screen. An MAS(Maintenance and Administration System)(101) receives the transmission delay measurement request, generates a request data unit including information for discriminating the specific path and transmits it to a packet processor(103), and calculates the transmission delay time with respect to the specific path and transmits it to the operator terminal(100) when a response data unit with respect to the request data unit is received. The packet processor(103) converts the data unit received from the MAS(101) into an IP packet and transfers it to a forwarding engine(107-2), and converts an IP packet received from the forwarding engine(107-2) into a data unit of an application part and transfers it to the MAS(101). A label mapping table(108) stores MPLS label values with respect to LSP paths. The forwarding engine(107-2) reads an MPLS label value with respect to one specific path, MPLS-encapsulates the IP packet received from the packet processor(103), and transfers a probe packet to the other switch router. When the forwarding engine(107-2) receives a response packet with respect to the probe packet from the other switch router, it MPLS-decapsulates the response packet and transfers an IP packet to the packet processor(103). |
