A grading services edge router

Abstract

As the prior Diffserv router applies mode of single queue data buffering and shortest route forwarding, in the situation of limited bandwidth (link capacity) and multi-router relaying, inevitably existing the problem of delay transfinite and high service priority data stream blocking, both making is difficult to implement the QoS (service quality) capability. For resolving the problem, the invention provides multi-queue parallel processing and grading access control Diffserv edge router. The invention provided the Diffserv edge router can assure the delay and low package losing rate of high service data stream so as to implement grading multi-rate transmission of mixed data stream in the situation of limited link capacity.

Description

technical field [0001] The invention relates to network routing technology, in particular to a hierarchical service edge router. Background technique [0002] In order to meet the needs of voice services and multimedia services, the traditional IP network mainly used for data services has to consider adopting a hierarchical service algorithm for each node router of the network to evolve to a hierarchical service network. In order to ensure the quality of service (Quality of Service, QoS) on the IP network, the Internet Engineering Task Force (Internet Engineering Task Force, IETF) first proposed to use RSVP (Resource Reservation Protocol) and Intserv (Integrated Service) model, see reference [ 1, 2], establish the transmission path to the receiving end and reserve resources before sending data, and realize end-to-end QoS through mechanisms such as access control, policy control, and classified scheduling control. [0003] Since each router on the transmission path needs to ...

AI Technical Summary

Problems solved by technology

[0012] However, the edge routers of the existing Diffserv network still have the following problems, which cannot guarantee the priority voice service and multimedia real-time service quality of the IP network

[0013] Problem 1: The existing technology is to classify and mark the data flow received at the edge router entrance, control packet loss, and forward according to the service level, but does not consider whether packet loss control is necessarily effective

Network simulation experiments show that: if the TCP and UDP flows are in the same buffer queue of the Diffserv edge router, the TCP flow will reduce the sending rate due to congestion, while the UDP flow will be sent at the original rate, which will cause the UDP flow to suppress the TCP flow and occupy more bandwidth while TCP streams do not get fair connection capacity

[0014] Problem 2: The edge routers of the existing Diffserv network do not consider the access control of aggregated and hierarchical data flows according to the output connection capacity

In the case of limited connection capacity, the access of a large number of high-service-level data streams (VOIP) will also cause a large number of edge routers to lose packets, and the quality of service of the accessed high-service-level data streams cannot be guaranteed.

[0015] Problem 3: The edge routers of the existing Diffserv network cannot discover the congestion of the downstream node routers of the path

Images