【作者】 李喜明；

【导师】 秦贵和；

【作者基本信息】 吉林大学 ， 计算机应用技术， 2007， 硕士

【摘要】 以软交换技术为代表的下一代网络，在给用户带来更多的便利、给运营商带来网络简化、成本降低等优势的同时，软交换的大容量体系(业界普遍标准为100万用户)也给运营商带来了极大的安全隐患，一旦核心设备出现故障，将引起大范围的通信中断，因此需要将网络容灾技术引入软交换领域，构建软交换容灾系统。本文系统阐述了网络容灾系统的关键技术，并在华为公司M软交换系统上实现了异地容灾功能。本文通过对软交换容灾系统的关键技术:灾难检测、数据同步、系统迁移进行分析研究，对软交换异地容灾系统进行了结构设计和详细实现，通过该系统的应用，能够有力的提升软交换系统应对灾难的能力，同时对于软交换技术和下一代网络的发展有现实意义。更多还原

【Abstract】 Telecom is an industry which needs a high reliability, the precisionof the reliability is 99.999%, which means the system will halt no morethan 5 minutes in one year. So the disaster tolerant system is moreimportant for the telecom system.The concept of the softswitch was first brought up in 1997, it wasquickly be accepted by the industry. In several years, under the impulseof the manufacturers and the network operators, the softswitch productsare more and more mature. With the development of its factions, thesoftswitch technique is taking its step to the market.The next generation network is represented by the softswitchtechnique, at the time the softswitch technique take the customers moreand more convenience and optimize network performance, it also take theoperators big safety problems, because its large content system whichis slandered by the industry－1 million customers. Once the facilityhas something wrong it will bring wide range communication problems.So we need to introduce disaster tolerant technology into the softswitchfield, and build a disaster tolerant system of softswitch.At the sametime, the capacity of disaster tolerant of the softswitch is the keyto the development of NGN and softswitch.This dissertation uses the mature network disaster toleranttechnique, and it had implemented a long-distance softswitch disastertolerant system on the M softswitch system of Huawei Tec. This disastertolerant system not only realizes the long-distance function but alsoimplements a technique of“mutual help system”. As a softswitch systemfor disaster tolerant, it can used as an independent softswitch system,when the host has some faults, the backup system will realize thetransference of the host system smoothly with no influence on its ownoperations. It has reduced much losing of the system recourses.It has enhanced the reliability and security of the entire system. This systemhas been used on the T office of the China Mobile Company.The main content of this paper as follows:1. The paper has introduced the basic theory of the network disastertolerant technical and the softswitch technical and analyzed theimportance and feasibility of disaster tolerant function in softswitchsystem.2. With the analyses of the mature structure module of the networkdisaster tolerant system and the requirement of the softswitch system,this paper designs the function structure module chart and has detailedstudied the function module of the softswitch disaster tolerant system.The module contains the data synchronization, disaster detection andthe system migration. And then the implementation technology of eachmodule is analyzed and researched.3. Study the entire function module and implement it.(1)Disaster detection: It has brought up a concept of adjustinterval of the send information dynamically based on the networksituation and the process ability of the system in the current time.It is good to solve the conflict of heartbeat interval, handlingcapacity of system and the network conditions. Meanwhile, theadditional authentication information in the heatbeat information isa powerful network security protection.(2)Data synchronization: This article has referred to the currentmany mature data duplication technologies. The softswitch system is thecontrol main body of NGN network t, and its core data is configuredmainly through the plan the manual disposition. So, the basic data canbe configured manually, we can synchronize the dynamic data only. Themerit of this plan is, data synchronization realization is simple andeasy. It is more advantageous to the telecom network development to usesuch compromised plan. enhanced the reliability and security of the entire system. This systemhas been used on the T office of the China Mobile Company.The main content of this paper as follows:1. The paper has introduced the basic theory of the network disastertolerant technical and the softswitch technical and analyzed theimportance and feasibility of disaster tolerant function in softswitchsystem.2. With the analyses of the mature structure module of the networkdisaster tolerant system and the requirement of the softswitch system,this paper designs the function structure module chart and has detailedstudied the function module of the softswitch disaster tolerant system.The module contains the data synchronization, disaster detection andthe system migration. And then the implementation technology of eachmodule is analyzed and researched.3. Study the entire function module and implement it.(1)Disaster detection: It has brought up a concept of adjustinterval of the send information dynamically based on the networksituation and the process ability of the system in the current time.It is good to solve the conflict of heartbeat interval, handlingcapacity of system and the network conditions. Meanwhile, theadditional authentication information in the heatbeat information isa powerful network security protection.(2)Data synchronization: This article has referred to the currentmany mature data duplication technologies. The softswitch system is thecontrol main body of NGN network t, and its core data is configuredmainly through the plan the manual disposition. So, the basic data canbe configured manually, we can synchronize the dynamic data only. Themerit of this plan is, data synchronization realization is simple andeasy. It is more advantageous to the telecom network development to usesuch compromised plan. good to prevent vandalism and attacks on the state, the illusive statecan lead to the "double life" and trigger network system disorders.5. The technology of "virtual softswitch" is adopted, which can makethe implementation of softswitch network disaster tolerant system moreflexible and convenient.The disaster tolerant system has some functions while not perfectbecause of the short time of development cycle, such as datasynchronization is not enough; statistical information can not beachieved simultaneously and so on. In the follow-up study thesefunctions will be further improved and refined.更多还原