• The KIPS Transactions:PartA
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• v.16A no.5
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• pp.369-380
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• 2009

SNMP (Simple Network Management Protocol) is a standard protocol for management of network devices, and it provides excellent features such as scalability, information management, authentication, encryption, and access control. However, SNMP has a structural weakness to fully support control functions for integrated management of digital convergence devices, and it has a limitation of message length in SNMP communication. In this paper, we present an extended SNMP scheme for integrated management of digital convergence devices with control functions. We modified the SNMP architecture by adding DDS (Device Driver Subsystem) to SNMP engine for controlling different devices and by defining CADM (Control Agent Driver Model), therefore we solved the ambiguity problem between 'set' and 'control' of SNMP. And the extended SNMP made it easy for SNMP applications to use various control functions. The extended SNMP can transport massive high-level information by adding three new SNMP commands which eliminate the limit of message length.

• The Transactions of the Korea Information Processing Society
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• v.7 no.8
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• pp.2505-2513
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• 2000

This paper describes the design and implementation of a CORBA/SNMP gateway. The gateway is used to integrate traditional network management systems using CORBA. The integrated network management system uses World Wide Web (WWW) and CORBA. WWW provides a platform-independent and easy-to-use interface to distributed applications and CORBA is used to integrate different network management models seamlessly. To support the traditional managed objects without modification, we use a translation gateway between two different management models. The integrated network management server consists of a WWW server with enhancement for network management and translation gateways for converting management operations between different management models. This paper describes the design and implementation of a CORBA/SNMP gateway. The CORBA/SNMP gateway provides a syntactic and dynamic translation between CORBA and SNMP management models. The gateway provides a CORBA view to SNMP MIBs and allows the CORBA managers to access SNMP agents via CORBA operations. The CORBA/SNMP gateway also delivers the traps occurred in the SNMP agents to the CORBA managers that want to receive the trap information.

• The Transactions of the Korea Information Processing Society
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• v.6 no.2
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• pp.449-458
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• 1999

In real-time systems, the accurate response time and minimal communication delay is highly desired. However, a conventional SNMP uses network resources inefficiently and introduces too much network traffic for periodic requests in particular. This paper presents an extended SNMP called Real-Time SNMP. It is designed to support real-time applications with time constraints to provide more accurate response time and less network traffic for periodic SNMP request PDU which is sent from a management station to agents. In addition, the module of the Real-Time SNMP agent works between management station and each SNMP agent to periodically generate requests for the associated agent. In this paper we have implemented the proposed Real-Time SNMP agent module and extended SNMP PDU. We also show the experimental results that indicated more punctual response time and reduced communication delay using the proposed Real-Time SNMP.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.43 no.3 s.309
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• pp.1-9
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• 2006

SNMP is a standard protocol for management of networking devices. Nowadays, most computer systems have capability to act as SNMP agents. In this paper, we developed a low overhead version of SNMP library for embedded systems, and implemented a monitoring software based on the library for a large number of target systems. The monitoring system consists of a monitoring server, SNMP agents, and client programs. The monitoring server collects status information from SNMP agents running on the monitoring targets, and sends summary information to client programs. We implemented two versions of clients, Java based standalone program and Web based program.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.28 no.4B
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• pp.361-368
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• 2003

An SNMP manager requests a value in MIB of a designated object to an agent by management policy defined in the SNMP, and then the agent responds to this manager. So, it causes a lot of networks traffic between them, Specially, repetitious occurrence of sending-receiving information related to the same object is very inefficient when the trend analysis of traffic is performed. In this paper, an efficient SNMP is proposed to add new PDUs to the existing SNMP in order to accept time function. Utilizing this PDU, it minimizes unnecessary sending-receiving information and collects information on trend management appropriately. The implemented SNMP is tested for compatibility with the existing SNMP and decreases the amount of network traffic greatly.

• Journal of Industrial Technology
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• v.25 no.A
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• pp.175-182
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• 2005

SNMP is a standard protocol for management of networking devices. Nowadays, most computer systems have capability to act as SNMP agents. In this paper, we describe our system monitoring software based on SNMP. It consists of a monitoring server, SNMP agents, and client programs. The monitoring server collects status information from the SNMP agents running on the monitoring target graphical display. We developed two version of clients, Java based standalone program and Web based program. Since most known SNMP packages are too big and heavy, we developed an efficient version of SNMP library for out system monitoring.

• Journal of The Institute of Information and Telecommunication Facilities Engineering
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• v.1 no.1
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• pp.40-50
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• 2002

A traditional agent was difficult to upgrade and to add MIB implementation code to it because most SNMP agent designs had MIB that was not a self-contained module. To solve this problem, we design the SNMP agent bundle composed of remotely uploadable SNMP agent core bundle and MIB Bundle Also, downloadable server bundle and user administration bundle is added to SNMP agent bundle to download MIB bundle from bundle server. By designing MB-MIB, we enable the network manager to monitor status of MIB bundle on managed devices. The network manager is allowed to install and upgrade the SNMP module or MIB remotely on line. This is the major benefit of designing the SNMP agent bundle based on OSGi. Finally, we expect the network manager to reduce time and expenses in managing enormous networks by using the SNMP agent bundle.

• Journal of the Korea Society of Computer and Information
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• v.15 no.2
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• pp.99-107
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• 2010

SNMP(Simple Network Management Protocol) is most commonly used as a standard protocol for effective network management by supporting the increasing size of the network and the variety of network elements such as router, switch, server and so on. However, SNMP has performance drawbacks of network overhead, processing latency, and the inefficiency in data retrieval. In this paper, we propose two schemes to improve the performance of SNMP; 1) the first scheme to reduce the amount of redundant OID information within a SNMP-GetBulk response message, 2) the second scheme of newly proposed SNMP-GetUpdate message combined with the cache in MNS. Through the analysis with real experiments, we show that our first scheme reduces the network overhead and the second scheme improves the processing latency and the retrieval of SNMP MB tables. And, therefore the scalability of network management can be improved.

• Proceedings of the Korean Information Science Society Conference
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• 2000.10c
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• pp.183-185
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• 2000

본 논문에서는 SNMP를 이용한 Nerwork Management System(NMS)이 Network을 사용하는 Application에 영향을 주지 않도록 하는 Polling 전략과 Model을 설계하였다. 제안된 System은 Network의 각 Client 정보를 처리하는 Agent와 Data 수집 및 제어를 담당하는 Server로 구성된다. Agent는 SNMP Agent 부분과 Network 상태를 Monitoring 하는 SubManager로 구성되어, Server는 SNMP Agent와의 Polling 및 Polling 정책을 결정하는 부분으로 구성된다. 제안 Model은 SNMP를 이용한 NMS를 도입할 경우, 기존 Network Service에 영향을 주지 않도록 하는 것이 목적이다. 제안된 System에 대한 성능평가를 위해 실존하는 Network을 대상으로 SNMP의 Polling 및 Service의 부하량을 측정하였다.

• Proceedings of the Korean Information Science Society Conference
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• 2001.04a
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• pp.253-255
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• 2001

본 논문은 SNMP 에이전트이 동적인 확장을 위하여 Java를 사용하는 AgentX의 설계와 프로토타입의 구현에 대해 설명한다. AgentX는 SNMP 에이전트이 구조를 마스터 에이전트와 서브 에이전트로 분리하여 SNMP 에이전트를 동적으로 확장할 수 있는 구조를 갖는다. 기존의 SNMP 환경에서는 새로운 관리 기능의 추가가 어려웠다. 이미 배치된 장비 내의 SNMP 에이전트를 확장하기 위해서는 기존은 SNMP 에이전트를 새로운 SNMP 에이전트로 대체시키는 방법을 사용하였다. 그러나 이런 방법은 수행 중인 장비를 셧 다운 시키지 않는 상태에서 동적으로 새로운 관리 기능을 추가할 수 있도록 하기 위한 자바 기반 AgentX를 설계하고 프로토타입을 구현하였다.