Enterprise core switch consists of four elements

Enterprise core switch consists of four elements       目前，国内大多数企业原有的网络普遍由电信骨干网络接入，只能完成一些基本的信息交换功能，无法满足企业同时处理多元化业务、迅速增加的分支机构进行信息交换、信息交换量剧增等复杂的网络应用需求。因此，构建自己的核心交换网络已经成为大中型企业的首要任务之一。    At present, most domestic enterprises generally by the existing network of telecommunication backbone network access, can complete some basic information exchange function, can not meet the branches of enterprise at the same time, the rapid increase of the diversified business information exchange, information exchange network applications demand surge complex. Therefore, it is one of the most important tasks for large and medium sized enterprises to build their own core exchange network.       核心交换机是企业核心交换网络的关键设备，考虑到我国企业现阶段普遍的实际情况，建议在选择核心交换机时，应该从其产品性能、可扩展性、可靠性、安全性等四个方面进行考查。    The core switch is the key equipment in the enterprise core exchange network, considering the present stage our country enterprise general situation, suggestions in the choice of the core switch, should from the performance of its products, can be extended in four aspects, reliability and safety test.       产品性能    Product performance       核心交换机肩负着信息交换“中枢”的重任，所以必须是一台全线速、无阻塞的交换设备。并且随着端口数和负荷的增加，它的性能应该呈上升趋势，这就要求核心交换机具备很高的设计参数。例如，“背板带宽为128G，转发速率可以达到9600万包/秒，在一个机箱的两片控制引擎上实现负载均衡”等，类似这样的设备，可以使企业用户在满负荷时实现全线速交换。在性能提升上，优秀的核心交换设备不再是单纯地追求高参数，而是增加了更多贴近用户的设计。    The core switch shoulders the important task of information exchange, so it must be a fast and non blocking switching equipment. And with the increase of the number of ports and the load, its performance should be on the rise, which requires a high level of design parameters. For example, the backplane bandwidth is 128G, forwarding rate can reach 96 million packets per second, in a case of two control engine to achieve load balancing ", such equipment can make the enterprise users to achieve fast switching at full load. In the performance improvement, the core of the excellent switching equipment is no longer simply to pursue high parameters, but added more close to the user‘s design.       1.交换结构    1 exchange structure       目前网络产品的结构设计，存在着多种不同的思路和方式。    At present, there are many different ways of thinking about the structure design of network products.       一种是采取集中式交换体系，如在中心放上性能和功能都非常强的控制引擎模块，在接口模块上设置一个简单的接口卡，所有的数据都通过背板传输交到中心卡上进行处理，处理完毕再由背板送回。这种设计思路的优势在于，可以从每一模块的端口上帮助用户去降低网络的成本; 不足之处是在网络数据的端口效率比较低的情况下，所有的数据交换都依赖于核心板卡的数据处理板卡能力，随着板卡数量的增多，整个交换机的性能呈下降趋势，即机箱的端口数和性能呈反比。    One is the centralized exchange system, such as engine control module in the performance is put in the center and functions are very strong, set up a simple interface card on the interface module, all the data transmission to the center through the backplane card processing, processed by the back back. In this design, can help users from each module port to reduce the cost of the network; the deficiency is in the network data port efficiency is low, the ability of data processing board and all data exchange are dependent on the core board, with the increase of the number of cards, the performance of the switch the number of ports is decreased, and the performance is inversely proportional to the chassis.       另外，可采取最新的分布式交换体系结构，在每一片接口卡上都由本机处理所有数据的交换、路由、转发以及安全过滤等，由多个板卡处理本地的控制和转发。其优势是: 性能有保证，随着板卡数量、端口数的增加，整机的性能是线性增长的;劣势在于:每一个板卡都需要添加相应的处理芯片，成本就会高一些。    In addition, can adopt the latest distributed switching architecture, in each piece of interface card by the machine processing of all data exchange, routing, forwarding and security filtering, a card processing local control and forwarding. Its advantages are: performance is guaranteed, with the increase in the number of cards, ports, the performance of the whole machine is a linear growth; the disadvantage is that each board needs to add the appropriate processing chip, the cost will be higher.