Liu Qi
MPLS is optimistic, it is no longer a day or two, its advantage has contributed to the common efforts of Cisco, ZTE, Harbor, Huawei, Shanghai Bell Alcate, Juniper, etc., therefore, the technology of the manufacturer will also climb, The scale procurement that may be triggered makes this technology to be constantly refined and broken. However, under the common test of CN2 and next-generation Internet, for MPLS technology and ATM technology, who has a warm debate in the network, or combined with a combination of boxing.
MPLS has false
The current core router is no longer a simple single data transmission device. With this year, the operators have a specialized telecommunication-level IP network in large-scale construction, while considering the performance and capacity of the equipment, the QoS, IPv6, IPv6, MPLSTE and other capabilities are also more concerned.
In this regard, Cisco, a hegemon has taken the initiative. In May 2004, the launch of the top core router CRS-1 will again focus on the Cisco's body. For such high-performance products, many other manufacturers are also actively R & D: such as Huawei launched NE5000 core router in June 2004, the capacity can be reached 1.28Tbps, while Juniper T640, Alcatel 7770 RCP and Harbor Powerhammer P640 exchange Capacity can also achieve this level.
The reason why MPLS attracted so much attention, and the most important reason is probably because it promises to provide IP networks to the control and security of the ATM network, can carry out virtual private network VPN services, and do the traffic engineering on IP online (TE) And provide service quality (QoS) guarantee, etc. That is, MPLS can overcome some fatal disadvantages of IP, but also use a lot of IP.
At present, the main problem facing large-scale deployment MPLS is that the standards of MPLS technology have not yet been completed, so there is inexvitably between different manufacturers. MPLS applications, such as MPLS-based traffic engineering, international standards such as VPN and VoiceOver MPLS are studying, formulated and improved.
ATM has no fade out
Just when MPLS is sought after, ATM is still not forgotten. ATM has been universally optimistic to provide a variety of business switching technology, but because people have generally adopted IP technology in the actual network, pure ATM networks are impossible. The existing ATM usage is generally used to carry IP, Therefore, MPLS is born in this context and becomes a means of providing value-added services in IP network operators.
In the interview, Guangdong Telecom Research Institute Lu Yanqing told reporters that it is currently an IP direction, and IP is also a industry trend. Although there are some ideas recently use ATM bearer, especially in access network, the sound of ATM is more obvious. . Lu's idea and the idea that originally used IP to carry it, then ATM is today, is it found to have a cute?
Rumei release, using ATM, service controllable, quality, easy to ensure that ATM in access network is clearly more advantageous, in addition, ATM equipment costs have not been as expensive. ATM and MPLS are mature and have excellent disadvantages. Almost all manufacturers will focus on IPMPLS, mainly considering the price. The technical factor mainly considers the IP trend, but MPLS still has many aspects less than ATM, such as fixed cell length, less time, and smaller business types, and bandwidth particles.
Integration trend
It is necessary to be clear that MPLS is not universal, it does not replace IP, it is, it is not, in the capacity range, MPLS will play the best features, and more network needs will wait for MPLS technology Mature and standard determination. The advantage of ATM is also gradually reflected in the process of continuous test error.
With the continuous development of network technology, users' demand for networks has gradually constructed to more abundant network applications from the basic network. Users need not only hardware devices, but also require these devices to adapt to future data, speech and video integration trends. And the fusion of technology also shows advantages. Some small manufacturers of North America such as RAD have introduced fusion technology such as TDM over MPLS, and the advantageousness of avoiding short-selling is the direction of fusion network, fusion technology. MPLS is a new generation of IP high-speed backbone network exchange standards. MPLS VPN has many characteristics of public network and private network, combining the reliability, scaifery, and rich features of the public network and the private network. Reduce the burden of remote access costs, save money, and provide secure end-to-end data communication.
ATM is asynchronous transport mode, is a connection-oriented fast packet switching technology, based on asynchronous time division multiplexing, and uses fixed length cells, supports each of data, voice, and images. Transfer of business. The ATM truly has a duality of circuit exchange and group exchange.
