widyatama.lecture.applied networking.iv week 12.network management
TRANSCRIPT
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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