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CIS-325
Data Communications
Dr. L. G. Williams,
Instructor
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Chapter Sixteen
Network Management
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What is Network
Management?
Process of controlling, monitoring, and
running the network
Concerned with both data and information
Information presupposes timely and
accurate communication of data
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Management Tasks
General management: Planning,
Organizing, Directing, Controlling, Staffing
Network management: All the same tasks,
with specific focus
Good planning and organization reduces
time spent controlling
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Ten Networking
Commandments
1. Thou shalt back up thy hard disk regularly
2. Thou shalt schedule downtime before doing
major work upon thy server
3. Thou shalt keep thy network disk clean of old
files
4. Thou shalt keep an adequate supply of spare
parts
5. Thou shalt not covet thy neighbor’s network
software (and upgrade without a reason.
(from Networking for Dummies, IDG, 1994)
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Ten Network
Commandments, cont’d
6. Thou shalt not steal thy neighbor’s software
without a license
7. Thou shalt train thy users
8. Thou shalt not tinker with thine Autoexec.bat,
Config.sys, or Startnet.bat unless thou knowest
what thou is doing.
9. Thou shalt not drop thy guard agains viruses
10. Thou shalt write down thy network
configuration in tablets of stone.
(from Networking for Dummies, IDG, 1994)
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Fault Management
Detect fault quickly
Isolate from System
Repair/replace failed component
Predict faults based on patterns and
history
Redundant components for ‘fault
tolerance’
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Fault Management
Procedures
Concerned with the human side of network
performance and fault mgt
Involves the management of complaints
Requires effective problem reporting and
tracking procedures, as well as ongoing
statistics on problem management
Need to track MTTR (mean time to repair) as
well as MTBF (mean time between failures)
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Accounting Management
Keeping track of charges
Usage by individuals or groups
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Configuration Management
Managing and documenting hardware and
software configurations
Network maps
System and subnet names and addresses
Group and user profiles and accounts
Detailed system and user documentation
Net initialization and graceful shutdown
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Performance Management
Ensuring the network is operating as
efficiently as possible
Set limits such as throughput, response
time
Monitoring activities on the net
Controlling by making adjustments
Stats important for planning
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Security Management
Encryption keys
Passwords and access lists
Detect unauthorized users
Maintain usage logs for audits
Provide users with confidence
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Network Management
Systems
Collection of tools for Monitoring and
Controlling
Hardware and software
Monitor status and performance of all
components
S/W resident in components
Runs in background
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Network Management
Entity
Collect and store stats
Xmit status to Control Center
Change unit parameters if necessary
Perform tests
Alert Central Control to problems
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Network Control Center
One unit in system designated
S/W here controls all NMEs
Provides user interface for Net. Manager
Often a backup system avail for
emergiencies
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Network Management
Software
Often self-configuring; they will search
out active devices and include them in a
logical map of the network (you must still
develop a corresponding physical map)
Increasingly, network devices are “smart”;
the record performance data and send it
to a monitoring facility so that changes
can be quickly and easily detected
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Technical Control
Availability is key
Needs
Automatic test and monitor
Restore or reconfigure - NOW!
Performance stats for planning
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Component Tech Control
Monitor traffic to/from a station
Line Monitor
“traps signals to provide precise oicture of
line activity”
Generate test signals
Analog can measure attenuation and
distortion
Protocol Analyzer
Active - simulates other hardware
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Network Tech Control
Too many line monitors to keep track of
System control integrates all monitors
Uses leased lines outside net
Remote control of h/w and s/w from
Central Control
Central Control is interface for Manager
diagnose problems, isolate faults, restore ops
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Performance Monitoring
Second most key characteristic
Collect data about response time,
throughput, and utilization
Use data to assess problems and develop
solutions
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Component Monitoring
Response time monitor
portable
times event from send until answer is back
determines Min, Max, and Avg time
Hardware Monitor
measures what happens in a component
time of an event, or number of events
passive device
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Component Monitoring
Software monitors
s/w resident in a station
gathers and reports statistics
monitor complete events or take snapshots
no special hardware required
will affect system as it monitors
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Network Monitoring
Continuously measure and analyze
parameters
Central monitor station
Data arrives by leased lines, not net
Data collection modules at each station
Able to monitor multi-vendor systems
Parameters listed in Table 16-3, p. 489
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Network Management
Standards: SNMP
Simple Network Management Protocol
Developed to manage TCP/IP networks
Devices collect info about themselves,
store it in a mgt. information base (MIB)
Management station can monitor and
reset MIB database
Single system can monitor 100’s of
stations
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