APPARATUS AND METHOD TO EFFICIENTLY USE THE PTP TIMESTAMP FOR ONE-WAY DELAY AND DELAY VARIATION MEASUREMENT IN IP NETWORKS

摘要

A method is implemented by a network device to establish a one-way active measurement protocol (OWAMP) test session to verify that a session-sender and session-reflector support a timestamp format extension including a Precision Time Protocol Version 2 (PTPv2) timestamp format. The PTPv2 timestamp format is to be utilized in place of a Network Time Protocol (NTP) timestamp format. The network device acts as a control-client that communicates with a server to establish an OWAMP test session between the session-sender and the session-receiver.

主权项

1. A method implemented by a network device to establish a one-way active measurement protocol (OWAMP) test session to verify that a session-sender and session-reflector support a timestamp format extension including a Precision Time Protocol Version 2 (PTPv2) timestamp format, the PTPv2 timestamp format to be utilized in place of a Network Time Protocol (NTP) timestamp format, the network device acting as a control-client that communicates with a server to establish an OWAMP test session between the session-sender and the session-receiver, the method comprising:
opening a transmission control protocol (TCP) connection to the server; receiving a server greeting message from the server, wherein the server greeting message includes an indication of whether the session-receiver is capable of interpreting timestamps in the PTPv2 timestamp format where the session-receiver supports the PTPv2 timestamp format extension to OWAMP; checking whether the session-receiver supports the PTPv2 timestamp format extension to OWAMP; configuring the session-sender to set timestamps using a timestamp format that the session-sender can set and the session-receiver can interpret in response to determining that the session-receiver supports the PTPv2 timestamp format extension to OWAMP; sending an extended set-up-response message to the server in response to determining that the session-receiver supports the PTPv2 timestamp format extension to OWAMP, wherein the extended set-up-response message includes an indication of a timestamp format that the session-sender can set and the session-receiver can interpret; and receiving a server-start message from the server.