Mpls-based Ip Qos Technology

The MPLS technology was raised just in order to make the most of the switching technology in the core of the network and the IP routing technology on the edge of the network.Before presenting the solution of the MPLS,there are many integration model ,the basic method adopted by them were all carry the control information from the IP router,and combine it with the transmition capability and the label switching of the ATM switching machine,accordingly constructing a high speed and economic multi layer switching router.But,all these solutions can not communicate and just suit for adapting the ATM as the second layer transmiting link,cann't work on other interface(FR,PPP,and ethernet),this is obviously conflict with the developing way of the based on packet of the internet.In order to settle all these problem,a criterion which will be adopted by most of the manufacturer and can be run on any layer should be proposed. So,IETF set up the MPLS working group in 1997,make use of the main idea and superiority of the integrated model,establish a consolidate,perfect third layer switching technology criterion.Since this paper is research about the IP QoS based on the MPLS,so we first introduce the presenting of the QoS,the definition of the QoS and those IP protocol which surpport the QoS,in addition,it also include two type of network model raised by IETF whose purpose is to realize QoS:Interserv and Diffserv.The main expression of the MPLS supporting IP QoS technology is that it's supporting on Interserv and Diffserv.the introducing of Interserv and Diffserv is put in the first chapter,the signalings adopted by these two services mainly are RSVP and CR-LDP,the introducing of the RSVP and CR-LDP are put in the 3rd chapter, in this chapter,we described the constrained routing technology of CR-LDP,the message realized in CR-LDP,the T/L/V in CR-LDP,the development of the RSVP-TE,how to extend the RSVP to surpport LSP tunnel,the detail information of the RSVP tunnel,the extended RSVP how to establish a LSP tunnel,how to transmit the business through LSP,how to reroute the existing LSP and so on.adopting these two signaling technology on how to guarantee the MPLS QoS realization is put into chapter 4.The final part is a conclusion of this paper.