METHODS, SYSTEMS, AND COMPUTER READABLE MEDIA FOR ONE-WAY LINK DELAY MEASUREMENT

摘要

A method for measuring one-way link delay includes transmitting a first packet from a first network device. The first packet is passively intercepted, a first copy of the first packet is transmitted to the first network device, and a second copy of the first packet is transmitted to a second network device. A time of receipt of the first copy of the first packet is recorded as an origin timestamp at the first network device. A time of receipt of the second copy of the first packet is recorded as a receive timestamp at the second network device. A second packet including the origin timestamp is transmitted from the first network device. The second packet is passively intercepted, and a first copy of the second packet is transmitted to the second network device. The first copy of the second packet is received at the second network device, and the origin timestamp is extracted from the first copy of the second packet. Link delay from the first network device to the second network device is calculated using the origin timestamp and the receive timestamp.

主权项

1. A method for one-way link delay measurement in a network, the method comprising:
transmitting a first packet from a first network device; passively intercepting the first packet, transmitting a first copy of the first packet to the first network device, and transmitting a second copy of the first packet to a second network device; at the first network device, recording a time of receipt of the first copy of the first packet as an origin timestamp; at the second network device, recording a time of receipt of the second copy of the first packet as a receive timestamp; transmitting a second packet from the first network device, the second packet including the origin timestamp; passively intercepting the second packet and transmitting a first copy of the second packet to the second network device; at the second network device, receiving the first copy of the second packet and extracting the origin timestamp from the first copy of the second packet; and calculating link delay from the first network device to the second network device using the origin timestamp and the receive timestamp.