Network management system based on the functional model of ... RED 081... · SNMP, CentOS, GLPI, OCS-INVENTORY,

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Network management system based on the functional model of the

IETF: SNMP, to monitor the resources of the network EMAPA-Is LAN

Edgar A. Maya, Richard A. Mallamas

Abstract.- The present project consists to de-signing a monitoring system based on the functio-nal model SNMPby using Open Source toolsin a network server provided by EMAPA-I withthe intention of obtaining a knowledge base onthe incidents that arise, facilitating the networkadministrator to take remedial measures in timethe devices are more susceptible to failures.

Indexed terms.- SNMP, CentOS, GLPI, OCS-INVENTORY, IP.


EMAPA-I is an enterprise that strives daily to main-tain high levels of management in the provision of ef-ficient basic services, quality and continuity, obtainingevery year to increase the number of its customers, sothat it is currently strengthening its technological in-frastructure gradually with the purpose of improvingthe provision of services for the benefit of the commu-nity. Currently the systems department is located in thestart-up phase to the search of a software that enablesyou to monitor the computer resources that are withintheir LAN network, therefore have not yet been establis-hed policies and processes to ensure both the reliabilityof the information as the availability in the communica-tions network, causing economic losses to the institutionby the interruption in the network.

This research document received in December 2015 was conduc-

ted as a preliminary project for the professional degree in Engineering

in Electronics and Communication Networks Engineering Faculty of

Applied Science (FICA) at the Tecnica del Norte University

E.A. Maya, professor at the Tecnica del Norte University, in the

Engineering in Electronics and Communication Networks, Av. 17 de

Julio sector El Olivo, Ibarra-Ecuador (phone 09-85198-101; e-mail: ea- ).

R.A. Mallamas, graduate of the School of Engineering in Elec-

tronics and Communication Networks (phone 09-85155-075; e-mail:

richard ).

The progressive increase of users hinder to resolve theproblems encountered by network congestion, same thatis caused by exceeding performance thresholds solution.Also they do not have tools to perform tasks handling,control and registration of notifications that alert on thestatus of communication devices, for this reason failuresnot be detectable in time, causing the discomfort of staffworking within the institution.

This whole series of problems have gradually affectingthe efficiency of the data network, because the organiza-tion lacks procedures to allow deployment failures in realtime or perform continuous monitoring using statisticsto assess the performance of communications resources.The technological growth EMAPA-I must guarantee thereliability of the data network, so the implementation ofa model-based management system will establish main-tenance policies designed to ensure the availability of theLAN of the institution


A. Network Management.

Network management includes the deployment, in-tegration and coordination of the hardware, softwareand human elements to monitor, test, polling, configu-re, analyze, evaluate and control the resources of thenetwork to achieve the requirements of real time, opera-tional performance and quality of service at a reasonableprice.

B. Elements of network management

In the network management there are two types ofentities: manager and agent, between which informationis exchanged for a diagnosis of network.

Molero, L. (2010) mention that a manager is a serverthat is running some type of software system that canhandle the administration tasks for a network, is res-ponsible for the choice and receive scans of the trafficof agents. The manager is that performs an inquiry inparticular to know the specific status of one or multiplecomputers within the network in order to detect irregu-larities

The second entity, the agent is a software within thedevice that you want to manage. Due to the great com-


plexity presented the networks currently, manufacturersadd agents in their computers to allow flexibility in themanagement of network. The agents are those who per-ceive any inconsistency within the device, and sends amessage to the manager to alert you to their currentsituation.

Today, the majority of the IP devices come withsome type of embedded SNMP agent, the fact of thesuppliers of devices are ready to deploy agents in manyof its products greatly helps the system administration.

C. Management model SNMP

IETF is a working group with an informal organiza-tion that contributes to the engineering and evolutionof Internet technologies, which has the responsibility ofdeveloping Internet standards; has defined a network ma-nagement model consists of four functional areas, whichare shown in figure 1.

Figure 1.- Management model SNMP

Below describes the basic functions that satisfies eachone of these areas:

Operation function.-It comprises the execution dailyand continues the network includes activities such asauditing, discovery and monitoring of the network toensure that everything is running correctly. (AlexanderClemm, 2007).

Management function.- Includes the support functionsrequired to manage the network, includes activities suchas the design of the network, tracking its use, addressassignment, planning upgrades to the network, receivingservice orders associated with end users and customers,inventory tracking of network. (Alexander Clemm, 2007).

Maintenance function.- Includes the functionality toensure the operation of the network and communica-tion services as expected. This includes activities suchas diagnostic, troubleshooting, and repair of componentsthat do not work according to what was planned, in or-der to maintain the network in a state in which it can beused continuously and providing the appropriate service.(Catedra redes de informacion, 2010).

Security function.- Includes features such as to maintainand manage the access control information, detection ofsecurity incidents, to identify the main risks and threatsthat affect the most critical servers. (Catedra redes deinformacion, 2010).

D. Simple Network Management Protocol (SNMP)

SNMP is based on the paradigm manager-agent, is anapplication layer protocol based on the TCP/IP archi-tecture, which makes possible the exchange of manage-ment information between network devices, its operationis described in figure 2, where it can be appreciated asinteract their main components that are: agent, simplenetwork management protocol (SNMP) and the mana-gement information base (MIB).

Figure 2.- Elements of network management SNMP

At present there are three versions of the SNMP protocoldefined as: SNMPv1, SNMPv2 and SNMPv3.

SNMPv1 constitutes the first definition and imple-mentation of the SNMP protocol, being described inRFCs 1155, 1157 and 1212 of the Internet EngineeringTask Force (IETF), in which account with basic fun-ctions both configuration and security. SNMPv2 offersseveral monitoring operations, with simple setup, whichare compatible with the majority of current network de-vices. However in the version 3, adds better security, aut-hentication, and access control.


The infrastructure available in EMAPA is centralisedin the virtualization of services, is currently composedof the following technological infrastructure:

A. Telecommunications room

The telecommunications room is located on the firstfloor of the building, here are the routing and switchingequipment as well as the servers, which are mountedin standard racks of nineteen inches. The equipmentroom is administered by the Department of InformationTechnologies and Communication, which is responsiblefor carrying out the maintenance and verification of thecorrect functioning of the technological infrastructure.


B. Servers

The servers are of vital importance for the properfunctioning of the institution of the bank of servers, so-me have are external support, while the following are incharge of the Department of Informatics:

Table I.

Servers that have the maintenance department of informatics

Trademark Server Importance




Active Directory-Antivirus-DNS



Correo High




The analysis for the choice of the virtual servers wasconducted taking into account the availability of fun-ctioning of the services provided by each of them withinthe Entity.

C. Network topology

The network is located in star topology, where ac-count with switches as central distributors and a firewall.The building of Emapa-I has 4 floors which counted withUTP cabling for the connection between the departmentswith which account every floor. The horizontal cabling ofthe institution is of type UTP category 6 and 5e, whichare installed in the fourth of computers, servers, and inthe departments of the institution respectively.D. Network diagram

The network scheme with which account the com-pany incorporates a device firewall, in addition to aCisco switch that binds the virtual networks with thefirewall as well as shown in the following figure:

Figure 3.- Network diagram EMAPA


A. Establishment of policies for management of compu-ting resources in Emapa-I

Below is the network management policies evaluatedfrom the SNMP mana