TWAMP session negotiation method, client, and server

The invention discloses a TWAMP session negotiation method, client, and server. The method comprises the following steps: negotiation in a private label carried mode is carried out between the clientand the server; when both the client and the server support the private label carried mode, a session request message for any VPN sent by the client to the server carries a VPN private label; and theserver extracts the VPN private label from the corresponding session request message as identification information for distinguishing different session requests. The TWAMP session negotiation method,client, and server provided by the invention has the advantages that a new communication mode is provided, in which the VPN private label is carried when the client sends the corresponding session request, so that the server extracts the VPN private label after receiving the corresponding session request as a basis for distinguishing the session requests, as well as a basis for subsequently distinguishing testing messages;