Maria Janilce Bosquiroli Almeida

Implementation and bandwidth consumption evaluation of SNMP to Web services gateways

Web services gateways are needed to include SNMP devices into a Web services based management architecture. We propose in this paper two approaches for such gateways and evaluate these approaches in order to verify the feasibility of using Web services closer to the network devices interface. We primarily tested the bandwidth consumed by these gateways when using SOAP with HTTP, HTTPS, and a compression process. The evaluation shows that Web services gateways are especially interesting when the number of SNMP object instances retrieved is high.

Investigating Web Services Composition Applied to Network Management

The composition of network management information is a feature widely required but poorly supported in traditional management technologies. Recently, Web services for network management has been enabling the investigation of more sophisticate management solutions, even though some concerns related to the Web services performance have been initially exposed, but quickly disappeared after the first research results. In this paper we show that Web services technologies have more to offer to the network management discipline than just bridging established network management protocols and Web services protocols. Particularly we explore the possibility of using Web services composition applied to network management. If successful, Web services composition can bring to network management the solution for some key problems yet to be solved, such as retrieving the information from several different devices and yet being able to use a simple and fast interface at the manager side. We present Web services composition for network management considering two approaches: in the first one a single network device needs to be contacted and its information composed; in the second one, many devices need to be contacted and the information retrieved from them need to be composed. We show that using proper tools we can not only really use Web services composition for network management, but also that such use can be integrated with traditional management technologies that are unlike to be abandoned in short and mid terms

An Approach for Integrated Management of Networks with Quality of Service Support Using QAME

Providing QoS-guaranteed services in current installed networks is an important issue, but only deploying QoS services is not enough to guarantee their success: QoS management must also be provided. Nowadays, police-based network management (PBNM) addresses this need, but such management is not enough either. Network managers deal with QoS tasks that cannot be performed using only PBNM. Other solutions, besides PBNM, have to be used to proceed with QoS management-related tasks. Unfortunately, these solutions are independent from each other, leading to a scenario where integration is difficult. This paper introduces QAME (QoS-Aware Management Environment) which main goal is the provisioning of facilities to allow a common and integrated Web-based management of QoS-enabled networks.

Definition and Visualization of Dynamic Domains in Network Management Environments

Dynamic domains are domains quickly created, used and discarded. Today, there are no facilities available to support dynamic domains in most network management systems. This paper introduces two new languages to deal with dynamic domains. The first language is used to define new domains through the selection of managed objects. The second language, on its turn, is used to visualize already created dynamic domains. Both languages are explained through examples and implementations details are presented.

On the design and performance evaluation of notification support for P2P-based network management

In this paper we present the design of a notification service used in a peer-to-peer (P2P) based network management solution called ManP2P. The notification service is based on the publish/subscribe paradigm, and implemented over a P2P overlay that carry the notification messages using SOAP, the Web services basic protocol. The performance of the notification service is evaluated considering the network traffic, the delivery delay, and the processing power required to forward notifications from physical devices (e.g., router, switches) to interested network managers. The results show that the notification service performs better if an increasing number of intermediate elements called mid-level managers is used between a notification source and destination.

An architecture for automated replacement of QoS policies

This paper introduces the notion of PoP (policy of policies) used to define standard policy replacement strategies in a policy-based network. We also propose an architecture to support PoP within PDPs (policy decision points originally defined by the IETF). The notion of PoP, and the proposed architecture allow the automation of the policy replacement task currently manually executed by the network administrator based on the network business plan.

QoS Monitoring System on IP Networks

At the current development stage of computer networks, the emergence of new applications that use the high performance available is unavoidable. In this context, any service that requires high performance also requires network QoS (Quality of Service). To help the maintenance of QoS services and QoS provisioning mechanisms, this work proposes a QoS monitor. This monitor operates on IP-based networks and its goal is to measure current QoS parameters observed on the network and compare them with the negotiated QoS parameters. Thus, network managers can be informed about degradations, and proceed with proper actions in order to provide adequate conditions to applications that require strict time warranties in order to operate properly.

On the performance of employing presence services in P2P-based network management systems

The use of notifications to report the status of underlying communication networks has a crucial impact on the performance of the managed network itself. Presence services, which are implemented using notification messages, have been designed with the objective to provide ways of delivering accurate presence information to interested parties. However, up to now, the use of presence services in the network management discipline has not been properly addressed. Is this paper, we propose an architecture that introduces presence services into traditional network management processes. We evaluated, through a system prototype implementation, the feasibility of using diverse presence services solutions as management tools and compare their performance against to each other. We present the results of a set of experiments regarding the propagation delay of the two main steps of a presence service, i.e., registration and notification. Those results allows a network administrator to choose which presence service solution is more adequate for the administrators necessities, thus helping to improve the notification process.

A protocol for atomic deployment of management policies in qos-enabled networks

This paper presents a novel protocol to support the atomic deployment of management policies for networks with quality of service (QoS) support. The necessity of such a protocol comes from the fact that faulty policy deployments lead to situations where the required QoS is not provided to network users but still consumes network resources such as bandwidth. In addition to the protocol definition, we present a Web services-based implementation and an analysis of the proposed protocol in a policy-based architecture for the management of differentiated services (DiffServ)-enabled networks.

Integrated Management of QoS-Enabled Networks Using QAME

Providing QoS-guaranteed services in current installed networks is an important issue, but only the deploying QoS services is not enough to guarantee their success: QoS management must also be provided. Nowadays, police-based management addresses this need, but such management is not enough either. Network managers often deal with QoS tasks that cannot be performed using only policy-based management. This paper describes six important QoS management-related tasks (QoS implementation, operation maintenance, discovery, monitoring, analysis and visualization) and shows solutions that can help managers proceed with these tasks. Unfortunately, these solutions are independent from each other, leading to a scenario where integration is difficult. To solve this lack of integration, QAME (QoS-Aware Management Environment) has been developed. QAME provides support to allow the execution of the defined QoS tasks in an integrated fashion.