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Network Management

A Network is a complex mixture of hardware and software technologies linked by networking technologies

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Desktop Admin

LAN InfrastructureNet Mgmt

WAN Net Mgmt

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Reasons for Network Management

• Proactively detecting failures of equipment before the users are aware.

• Monitoring traffic to aid in resource deployment

• Detecting mis-configured elements• Monitoring for SLA’s• Intrusion Detection

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Figure 12-11 Client/Server Infrastructure Architecture: Systems Administration and EnterpriseNetwork Management

Systems Administration Process Enterprise Network Management Process

Client management Server management Configuration management Desktop management Fault tolerance and availability management Distributed application management Help desk management

Tools

Software distribution License metering Inventory tracking Asset control Trouble ticketing Desktop management systems

LAN management Remote access management Internetworking device management Internet/World Wide Web management WAN management

Tools

Enterprise network management systems Network analyzers and remote monitor tools Network baselining tools Network modeling and simulation tools Network auditing tools

WAN services

Internet and WWW

clients servers

clients servers

hub

hub

GOLDMAN & RAWLES: ADC 3e FIG: 12-11

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Distributed IT Infrastructure Architecture

• Define the Components?– Servers &– Networks that connect Servers to each other & to

the clients they serve• No right/wrong way to divide

processes/responsibility• System Administration: Mgmt of Clients,

servers, OS’s & NOS’s that allow computers to communicate

• Enterprise Network Management

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Elements of IT Infrastrucuture that must be managed

• Enterprise network• LAN Management• Server Management• Desktop Management• Database Management• Application Management• Remote Access Management

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OSI Network Management Framework

• Fault Management• Configuration Management• Performance Management• Security Management• Accounting Management

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TMN Model

Telecommunication Management Network standards from ITU

• Business Management• Service Management• Network Management• Element Management

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IT Infrastructure Management

• A Challenge as IT Infrastructure is made up of a combination of separately managed and Monitored Elements

• Different management tools often do not interoperate or share Data

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Architecture

• Agents are S/W that runs on networking devices to monitor and report– Must be compatible with the NMS

• NMS Compiles, Displays, Reports and Alarms

• Stores data in a Database– Database has an Index and standardised field

definitions = MIB– Fields within MIBs known as Objects

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From: SUN Solstice TMN manager White Paper

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Protocols

• Protocol used to communicate between agents & NMS is SNMP

• Management traffic can be up to 30% – Affects network you are monitoring– Now available: Distributed Management

• sub-NMSs

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Protocols

• New: Web Based Management = WBEM• uses HMMP - Hypermedia Management

protocol– Replace SNMP and DMI?

• Advantages:– Common Interfaces for all devices– NMS is Platform Independent

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RMON

• Remote Monitoring• RMON Probes - An Agent that collects and

reports performance statistics to an NMS

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Network Analysers

• Ie Sniffer, Lanwatch• Monitor at a single point on a network• Can display data from most of the OSI layer

separately

• I do not consider Physical layer testers such as cable scanners, signal quality monitors, BERT testers.

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References

• Goldman Chapter 12• Kurose & Ross

• Stallings Chapter 19

• Tanenbaum Chapter 7.3