Widyatama.lecture.applied Networking.iv Week 12.Network Management

8/9/2019 Widyatama.lecture.applied Networking.iv Week 12.Network Management

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Basic of Network Management


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Basic components

Fig 3-1


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Network devices

A NE (network element) must offer amanagement interface for managementpurposes

configure, retrieve statistical data and etc)

Send information (response and unsolicited )

Manager a managing application who in

charge of the management Agent a NE who support the manager by

responding its requests


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Manager-agentcommunication

Fig 3-2


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Management agent

Consists of 3 partsA management interface

The core agent logic


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Management interface

Support a management protocol thatdefine rule of conversation Communication between the managed

network element For example

To open management session

To request to retrieve statistical data To request to change configuration


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Management Information Base(MIB)

Conceptual data store (managementinformation) that contain management viewof devices

A type ofdatabase used to manage thedevices in a communications network. Itcomprises a collection of objects in a (virtual)

database used to manage entities (such asrouters and switches) in a network. (Ref.from wikipedia)


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MIB related standard

RFC 1155 Structure and Identification of Management

Information for TCP/IP based internets

RFC 1157 Simple Network Management Protocol

RFC 1213

Management Information Base for NetworkManagement of TCP/IP-based internets


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MIB OID Tree

OID = 1.3.6.1(internet)

OID = 1.3.6.1.4.1.2682.1(dpsAlarmControl)


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Core agent logic

Translates between the operation of themanagement interface, MIB, and actualdevice

Ex. Translate the request to retrieve a counterinto internal operation that read out a devicehardware register.

Additionally, it can include more managementfunctions that offload the processing requiredby management app.

Pre-correlated raw events before sent out


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An anatomy of managementagent

Fig 3-4


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Management information (1/2)

The version of installed software To decide which devices need to have new

software

Utilization of ort Whether capacity upgrades are necessary

Environmental data (temperature andvoltage) Ensuring that a device is not overheating

Fans What is causing the temperature to rise


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Management information (2/2)

Packet counters for different interfaces Whether the network is under a certain type of

attacks (DoS)

Protocol timeout parameter To fine tune network communication performance

Firewall rules

Security purposes others ?


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Managed object (MO)

Refer to a chunk of managementinformation that exposes one of the realworld aspects

.operational state, a port on a line card along witha set of statistical data

MO could be

a MIB object in SNMP a parameter in a CLI (command-line interface)

An element of an XML document in web-basedmanagement interface


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Not all aspects in the real world are modeled Color of devices

Real world object that MO represents is

referred to as thereal resource Since management information in MIB

represents real resource

When querying the MIB for MO representing apacket counter 3 times, the value returned will bedifferent


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Basic parts of networkmanagement - refined

Fig 3-6


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The Management System

Tools to manage the network monitor the network

Service provisioning system

Craft terminal In fact, management system is different

from management applications

But often we can use both as the samemeaning


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Manager/agent referencediagram

Fig 3-8


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Caching MIB

Fig 3-9


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The Management network

Networks for carrying traffic ofsubscriber or end user are referred as

production network

Networks for carrying managementtraffic are referred as managementnetwork

Both can be physically separatenetworks or they can share the samephysical network


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Connecting a craft terminal toa managed device

Fig 3-10

Linksys-

Basic_Network_Management-

3m26


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Connecting to multiple devicesthrough a terminal server

Fig 3-11


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Dedicated Vs Shared

Management and Productionnetworks

Fig 3-12


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Pros of a dedicatedmanagement network

Reliability Congestion or network failure occurs somewhere in the

network, it makes the devices hard to reach

Also hard to find out what it happen

Interference avoidance Compete with production traffic

May interfere high QoS services (voice ,video streaming)

Ease of network planning

No need to consider on management traffic Security

Hard to attack and more secure


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Cons of a dedicatedmanagement network

Cost and overheadAddition cost for a management network

Some devices do not provide a physicalconnection for another usage

DSL router cannot be connected with twophysical links


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Final word

Cost is the huge disadvantage So, the management network is needed

onl critical area Backbone of service providers or big

enterprises)

Hybrid solution Generally, it shares over production

networks

Only critical segments are used as

dedicated networks


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Managing the management

The management support org. is responsiblefor making sure that the network is being runefficiently and effectively

hese tasks must be performed Monitoring the network for failures

Diagnosing failures and communication outages

Planning and carrying out repairs Provisioning new services and adding/removing

users


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Keeping an eye on performance of thenetwork

Taking preventive measure

Planning network upgrades Increase capacity

Planning network topology and buildout

Ensure that the network will meet futuredemand


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Organization structure

Network planning Analyzing network usage and traffic patterns and

planning network build out

Network o eration Keeping the network running and monitoring thenetwork failures

Network administration Installing new devices / software

Customer (user) management Interacting with the customers


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Other thing are needed

Establishment of process andoperational policies, documentation ofoperational procedures

Well-defined procedures Well-defined workflow

Make management consistent and efficient

Collection of audit trailsAutomatically logging activities of

operations


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Network documentation Must be accurate and up-to-date Important for network planning and software

upgrades

Identify some discrepancies Reliable backup and restore procedures

Bring network back to live again in case ofdisaster

Security emphasis Networks potentially most vulnerable from the

inside Limit the damage that can cause by one person


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Management life cycle

Plan

Before the network system starts

During the network system is running


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Management life cycle

Deploy Installation of the equipment

Bootstrap mechanism to allow a device to obtainand IP address and have layer2 or 3 connectivity

Operate

Monitoring/troubleshooting/performance tuningand etc

Decommission

Old equipments (old technology) will be replace


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TMN-layer: a managementhierarchy reference model


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Management layer

TMN (telecommunication Managementnetwork)

Element management

Network management

Service management

Business management


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Network element

It means the management agent It involves with

Communication pattern (protocols)


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Element management

Involve managing the individual devicesand keep them running

Functions such as to view and change a network elements

configuration

To monitor alarm messages emitted from

elements To instruct network elements to run self-

test


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Network management

Concern with keeping the networkrunning as a whole (end-to-end)

flow to reach destination with acceptablethroughput and delay

Managing multiple devices in a concerted

fashion


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Service management

Managing the services that the networkprovides and ensuring those servicesr r nnin m hl

Lets think as ISP (Internet serviceprovider)

?


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Business management

Billing and invoicing Help desk management

Etc ?


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Applied Networking-IV (2231114)

Lecture Week-11

Basic of Network Management

Final Word

Lecture by: Djadja.Sardjana, S.T., M.M.www.slideshare.net/djadja

NetworkManagement

Fundamentals-3m48

Widyatama.lecture.applied Networking.iv Week 12.Network Management

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