Abstract: A method for obtaining link aggregation group (LAG) information, and a node and a system thereof are provided, which belong to the field of communication technologies. The method includes the following steps. An ingress node of a label switched path (LSP) sends an echo request message to another node on the LSP, in which the message carries identification information, and the identification information is for identifying that the LAG information on the LSP needs to be obtained. The ingress node receives an echo reply message returned by said another node, in which the message carries LAG information between said another node and a next hop node on the LSP. The present invention implements the obtaining of LAG information on the LSP and brings great convenience to OAM of MPLS network, and has the advantages of being simple, convenient, and easy to implement and having strong practicality.

Abstract: A method and a device for measuring network performance parameters are disclosed. The method includes: receiving an extended bidirectional forwarding detection (BFD) packet that includes a packet loss monitoring Type-Length-Value (TLV) and/or a time delay monitoring TLV; and calculating network performance parameters according to the packet loss monitoring TLV and/or the time delay monitoring TLV in the received extended BFD packet. The device includes: an extended BFD packet receiving module and a network performance parameter calculating module. The method and the device enables the calculating of network performance parameters and the monitoring of network performance, and therefore the problem of monitoring network performance in technical solutions in the prior art is solved.