Abstract: To guarantee the well-balanced, reliable and high-quality service, the specification of service quality evaluation challenges the quality management of NGI (next generation Internet) IP VPN (IP-virtual private network) service. Six IP-VPN service grades are defined and the quality evaluation architecture of NGI IP-VPN service supporting multi-grades is proposed. Then the calculation methods and mathematics formulations are presented in detail. The quality evaluation architecture is applied to the IP-VPN service practically and effectively on solutions and algorithms.

Key words: next generation Internet, IP-virtual private network, service grade, quality evaluation