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The Research and Design of PMT in Policy-Based QoS Network Management System

Author: FanPeng
Tutor: WeiDa
School: Jilin University
Course: Software Engineering
Keywords: Tactics QoS PBNM PCIM Directory server DAP conflict detection
CLC: TP393.07
Type: Master's thesis
Year: 2004
Downloads: 241
Quote: 2
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Abstract

In recent years, Internet has been rapid development, in particular, has played a strong role in promoting IPv6, the next-generation network NGN (Next Generation Network) and third-generation mobile communications 3G (3rd Generation) and other related technologies, which makes the current network showing business and many types of complex equipment, it is difficult to achieve unified management features. Traditional network management based on SNMP SNMP (Simple Network Management Protocol), the drawback has been very clear: equipment static management, network administrators familiar with a variety of devices, interfaces and naming, it is difficult to achieve flexible and efficient target. PBNM (Policy Based Network Management), network management strategy in the field of network management is an emerging research and applied topics, can greatly simplify network management process. Strategy (Policy) is a group used to manage a set of rules to configure and control access to network resources. PBNM system by separate control and execution of management behavior, managers do not need to configure all network devices one by one, just to draw some meaningful management strategy, and strategy by the management system to perform, the system will According to the policy rules automatically perform the management of network resources. The management strategy is to manage the intelligent abstraction, has nothing to do with the specific network equipment, thus ensuring the reliability and consistency of management. The IETF policy management framework including policy management tools, policy storage warehouse, a policy decision point and policy enforcement point several parts. PMT for network management, policy management tools to provide input to the strategy as well as related information, modify, search, browse, and delete interface. The policy storage warehouse PR used to store strategy and related information. Policy Decision Point the PDP understanding of the status of network devices, you can configure and modify equipment strategy. It also can receive service requests from policy enforcement point strategy, and strategic decision-making. Policy enforcement point PEP is part of the strategies implemented in the network devices. Network equipment to take advantage of the policy management through PEP to configure policy information to network equipment. QoS management, policy-based network management, according to the SLA to develop appropriate strategies, control the processing of the network on the user's application needs to provide a certain quality of service guarantee, it can be based on different levels and needs of the user, effective, reasonable network resource management, which can guarantee the network to maintain high efficiency in the use of different levels of quality of service, but also for different users. QoS policy management has two modes: the outsourcing model and delivery model. Strategic outsourcing model is mainly used for PEP to request an immediate policy decisions, this mode of network events and policy request and decision-making at the same time lt; WP = 72 gt; occurred, as its communication protocol COPS-RSVP. Policy provided mode, the network administrator predefined device strategy, and downloaded to the PEP network events in the mode with the request event not occur simultaneously, this mode unlike outsourcing model PEP events and PDP decisions 1: 1, but is rather the PDP PEP on external events, PEP events and their joint response (N: M relationship), the communication protocol for the COPS-PR in advance. In this paper, the research IETF proposed design of the end-to-end QoS policy management system, based on the basis of the policy framework and end-to-end QoS, policy-based thinking applied to end-to-end QoS management. On this basis, the overall system framework, system framework is determined mainly includes five parts of the policy management tools, directory server storage module, PDP modules, COPS communication module and PEP module. PBNM with QoS combine two typical quality of service strategy, for example, discussed the basic principles of the policy information model and mapping to the directory server, and its extension. Netscape Directory Server as a strategy warehouse design and implementation of a strategic management tool. Typically, a strategic management tool consists of the following four components: the user interface, resource discovery the transformation logic components, strategy and policy distribution. The core of the policy management tool is still the policy transformation logic, which is the representation of the policy and management issues. Policy information model PIM (Policy Information Model) is an object-oriented information model, it extends the common information model CIM (Common Information Model), proposed by the DMTF (Distributed Management Task Force) is used to represent the policy information. Its purpose is to build the basic elements required by the strategy, and the effective organization of these elements, they can quickly establish strategies. This model defines two levels of object classes: structural object class represents the policy information and control strategies, the associated object class represents a the structured class instance how interrelated. PCIM policy control network as a state machine, and use strategies to control devices in a given time should allow or in what state. Collection a policy rule consists of a condition and an action is composed of a collection. The policy group can contain multiple policy rules can be nested to represent a group-level strategy. Strategy the conversion logic verification senior strategy provide the information, and convert them into the network device configuration information. The validation process includes syntax and semantics of the two aspects of the inspection. Senior strategist semantic checks include the following contents: border checks, the relationship examination, consistency checking, dominant check. A conflict detection is each strategy as a multiple independent fields and one or more derived field. Each independently of the field can be regarded as independent of a dimension in the multidimensional space. Each rule defines a region in a multidimensional space. If the point in space at the same time containing a plurality of conflicting dependent field, then there is a potential conflict. lt; WP = 73 gt; relational database and directory server performance, the choice of the latter as a strategic storage solutions. RFC 3703 provides a mapping from the policy information model to the directory server mode class. For policy information model structured class, basically is a one-to-one mapping: mapping information model class as Lightweight Directory Access Protocol, LDAP (Lightweight Directory Access Protocol) information model attribute mapping LDAP attributes. For policy information model associated class mapping method structured class. Policy information model associated classes and their attributes, there are three different mapping methods: the mapping LDAP auxiliary class, mapped attributes DN reference, on the lower level contains the mapping for the directory information tree DIT relationship. According to the mapping rules

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