The .6 Pe Transition Technology To Control And Forwarding Level To Achieve The Design

With rapid development of Internet in the world, the lack of IPv4 address has become the bottleneck of the advancement of network and communications industry.IPv6 has the unexampled advantage over IPv4 on IP address number, security, mobility,QoS, etc. Therefore, the transitions from IPv4 to IPv6 will be an inevitable trend in NGN network. MPLS is a hot topic in recent years, MPLS can be used to implement traffic engineering and QoS in the public backbone network, and MPLS can also bring out many kinds of flexible services. In this background, the technology of 6PE emerges as the times requires. MPLS 6PE is a technology based on MPLS, which can provide the tunnel for IPv6 in the IPv4 could.6PE was a transition technology from IPv4 to IPv6.It enables IPv6 islands to communicate with each other over an MPLS/IPv4 core network using MPLS LSPs.On the other hand,P router did not need to be updated to support IPv6. MPLS had not been influenced on itself including its various services. At the same time, the invested capital was as low as possible when IPv6 was over MPLS/IPv4. 6PE technology relies on BGP extensions in the IPv4 network Provider Edge Routers to exchange IPv6 reachability information. 6PE routers are dual-stack. IPv6 stream was encapsulated using two layers of labels by 6PE router. The top label provides connectivity inside the MPLS/IPv4 core network. LDP distributes it. The next label is used at each 6PE egress router for IPv6 forwarding . it is distributed by MP-BGP in the"IPv6+label"address family.The technology of 6PE will play a very important role in the transitions from IPv4 to IPv6.However, for the present, the application and study for 6PE technology are very little in China, and ASIC chips have not enough ability to forward MPLS packet.Considering this situation, in this paper, we put forward that network process is used to forward MPLS 6PE packet and extend features for business. As an example, we design and implement the control layer and forwarding layer of MPLS 6PE in the network devices. By the analysis of the theory and the validation of practice, we conclude that the IPv6 data packet can be fast forwarded successfully in the tunnel by using network processor. Furthermore, stability and performance of network devices based on network processor are far better than theirs based on X86 CPU. At the same time, MPLS 6PE implemented by using network processor has the unexampled advantage over ASIC on flexibility and extensibility.