Transcript Document

LAN/WAN Optimization Techniques
Chapter 14 Expanded Capabilities
Chapter 15 Network Management Decision
Approach
Chapter 16 Configuration Management
Chapter 17 Network Management Standards
Expand Capabilities
• The NDT functions are extended
– Response time calculations are refined
– Prioritizing
– Reliability or survivability calculation
• The average percentage of total network demand
supported under individual failures
• Double component failures are treated the same way
Expand Capabilities
• The NDT functions are extended (cont’d)
– Automated interfaces
• Input：configuration information and capacitythroughput requirements
• Output：standard structures, customized reports
– Future functionality：Integration
• Project management support systems
• Analytic tools
• Simulation
Expand Capabilities
• Operational evaluation criteria
– Availability
– Performance
– Cost
• Iterative refinement
– What if scenarios
• Optimization-based
Network Management Decision
Approach
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Network Management Phase (P. 228)
Configuration Management
Fault Management
Performance Management
Maintenance and Administration
Configuration Management
• Configure the communication lines
• Attach the communication equipment to the
network
• Achieve operational capability
• Tariff（How the lines are ordered）
• Testing of lines, hardware, and software
• Installations of new applications and
equipment
Configuration Management
• Questions to be asked
– Are the necessary circuits ordered?
– Has the economic analysis comparing dedicated
private-line and dial-up services been
conducted to determine the most appropriate
connection method?
– Are all the circuits turned up and operational
with communications equipment attached?
Fault Management
• Create problems for analysis and diagnosis
• Intermittent failure
• Physical transmission layer accounts for ¾
digital communication problems
• Conflict vendor diagnosis
Fault Management
• Questions to be asked
– Are all faults detected, or do periodic faults
remain in the network?
– Have the root causes of the faults been
corrected?
– Have faults been differentiated from network
errors?
Performance Management
• Tune parameters
• Preclude communications bottlenecks
• Trend analysis to meet end user needs
Performance Management
• Questions to be asked
– Do I have a quantifiable trend analysis of
anticipated end-user service levels?
– Has the on-line monitoring revealed any
deviations from the norm?
– Is the network consistently meeting end-user
service expectations for response time and
availability?
Maintenance and Administration
• Monitor the actual network performance
• Identify network faults
• Compare between the actual and the
predicted network conditions
Maintenance and Administration
• Questions to be asked
– Is the model validated by the performance of
the operational network?
– Does the model behave like the real world
communications network?
– Does the model accurately and completely
represent all the desired network characteristics?
Configuration Management
• Diverse sub-networks are interconnected for
end-to-end communications
• Difficult to develop management systems
that maintain QoS expectations while facing
changing user requirements
Configuration Management
• Equipment acquisition
– Understanding of the communications
equipment in the market
– Incompatibilities between vendor’s products
• Line configuration
• Installation
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Out of service testing
Stress test
Time test
The importance of hands-on experience
Configuration Management
• Maintenance and Administration
– Monitoring and continuous improvement
– Information is gathered, analyzed, and factored
back into future network design activity
– Comparisons between actual operation and
performance predicted by the NDT.
Network Management Standards
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Fig. 17.2 (P.240)
Interoperability testing
Conformance testing
OSI have defined five specific management
functional areas (SMFAs)
– Configuration, Fault Management, Performance,
Accounting, and Security
Protocols
• SNMP (Simple Network Management
Protocol)
• CMIP (Common Management Information
Protocol)
• Simplicity is the major concern in the
network field