NE20E-S V800R010C10SPC500 Feature Description - QoS 01

As networks rapidly develop, services on the Internet become increasingly diversified. Apart from traditional applications such as WWW, email, and File Transfer Protocol (FTP), the Internet has expanded to encompass other services such as IP phones, e-commerce, multimedia games, e-learning, telemedicine, videophones, videoconferencing, video on demand (VoD), and online movies. In addition, enterprise users use Virtual Private Network (VPN) technologies to connect their branches in different areas so that they can access each other's corporate databases or manage remote devices through Telnet.

Figure 2-1 Internet services

Diversified services enrich users' lives but also increase the risk of traffic congestion on the Internet. In the case of traffic congestion, services can encounter long delays or even packet loss. As a result, services deteriorate or even become unavailable. Therefore, a solution to resolve traffic congestion on the IP network is urgently needed.

The best way to resolve traffic congestion is actually to increase network bandwidths. However, increasing network bandwidths is not practical in terms of operation and maintenance costs.

The quality of service (QoS) that uses a policy to manage traffic congestion at a low cost has been deployed. QoS aims to provide end-to-end service guarantees for differentiated services and has played an overwhelmingly important role on the Internet. Without QoS, service quality cannot be guaranteed.