基于Diffserv的Cernet支持IP组播的隧道技术

在一个不支持IP组播机制的广域骨干网中,如何随时建立一个IP组播隧道机制。它与体系协议有关。首先简要介绍的是DiffServ体系的构成及IP包在该体系中实现QoS保证的方法,其次分析了现今的Cernet骨干网无法随时建立IP组播隧道机制的原因。针对这个原因,引入了DiffServ/RSVP体系,然后,对现今的Cernet骨干网的互联拓扑结构进行了理论上的改进,改进后的Cernet骨干网的拓扑结构是一种现行网状拓扑结构与星型拓扑结构相结合的结果。在这种新的拓扑结构上,提出了一种比较合理的策略规定,从而提供了一种DiffServ/RSVP体系作为Cernet骨干网可随时建立IP组播隧道机制的方法。

Tunnel Technique of Support IP Multicast Based on Cernet of DiffServ

It has relation with the system agreement that how we establish momentarily an IP multicast tunnel mechanism in WAN which does not support IP multicast mechanisms.The framework of the DiffServ system and the ways in which IP packets realized QoS guarantee are firstly briefed.Then the reason why it is impossible to establish momentarily an IP multicast tunnel mechanism in Cernet backbone network is analyzed.Due to this,DiffServ/RSVP system is introduced,and the topological structure of current Cernet backbone network is ameliorated theoretically.The ameliorated topological structure of Cernet backbone network is a combination of the current topological structure and astral topological structure.Based on the new topological structure,a novel kind of tactics regulation that is relative sound is brought forward.Consequently,a method of establishing momentarily IP multicast tunnel mechanisms is advanced,when DiffServ/RSVP is the backbone network of Cernet.