Widyatama.lecture.applied networking.iv-week-12.network-management

1. Applied Networking-IV (2231114)
Lecture Week-12
Basic of Network Management
Lecture by: Djadja.Sardjana, S.T., M.M.
www.slideshare.net/djadja
Monitis_network_
monitoring_
service_preview-
34s

2. Basic of Network Management

3. Basic components
Fig 3-1

4. Network devices
A NE (network element) must offer a
management interface for management
purposes
Allow managing system to send requests (
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

5. Manager-agent
communication
Fig 3-2

6. Management agent
Consists of 3 parts
A management interface
A Management Information Base
The core agent logic

7. Management interface
Support a management protocol that
define 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

8. Management Information Base
(MIB)
Conceptual data store (management
information) that contain management view
of devices
A type of database used to manage the
devices in a communications network. It
comprises a collection of objects in a (virtual)
database used to manage entities (such as
routers and switches) in a network. (Ref.
from wikipedia)

9. 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 Network
Management of TCP/IP-based internets

10. MIB – OID Tree
OID = 1.3.6.1
(internet)
OID = 1.3.6.1.4.1.2682.1
(dpsAlarmControl)

11. Core agent logic
Translates between the operation of the
management interface, MIB, and actual
device
Ex. Translate the request to “retrieve a counter”
into internal operation that read out a device
hardware register.
Additionally, it can include more management
functions that offload the processing required
by management app.
Pre-correlated raw events before sent out

12. An anatomy of management
agent
Fig 3-4

13. Management information (1/2)
The version of installed software
To decide which devices need to have new
software
Utilization of port
Whether capacity upgrades are necessary
Environmental data (temperature and
voltage)
Ensuring that a device is not overheating
Fans
What is causing the temperature to rise

14. 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 ?

15. Managed object (MO)
Refer to “ a chunk of management
information that exposes one of the real
world aspects”
Ex. MO could represent a device fan along with its
operational state, a port on a line card along with
a 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-based
management interface

16. Not all aspects in the real world are modeled
Color of devices
Real world object that MO represents is
referred to as the “real resource”
Since management information in MIB
represents real resource
When querying the MIB for MO representing a
packet counter 3 times, the value returned will be
different

17. Basic parts of network
management - refined
Fig 3-6

18. 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 same
meaning

19. Manager/agent reference
diagram
Fig 3-8

20. Caching MIB
Fig 3-9

21. The Management network
Networks for carrying traffic of
subscriber or end user are referred as
“production network”
Networks for carrying management
traffic are referred as “management
network”
Both can be physically separate
networks or they can share the same
physical network

22. Connecting a craft terminal to
a managed device
Fig 3-10
Linksys-
Basic_Network_
Management-
3m26

23. Connecting to multiple devices
through a terminal server
Fig 3-11

24. Dedicated Vs Shared
Management and Production
networks
Fig 3-12

25. Pros of a dedicated
management 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

26. Cons of a dedicated
management network
Cost and overhead
Addition cost for a management network
No reasonable alternative
Some devices do not provide a physical
connection for another usage
DSL router cannot be connected with two
physical links

27. Final word
Cost is the huge disadvantage
So, the management network is needed
only 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

28. Managing the management
The management support org. is responsible
for making sure that the network is being run
efficiently and effectively
These 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

29. Keeping an eye on performance of the
network
Taking preventive measure
Planning network upgrades
Increase capacity
Planning network topology and buildout
Ensure that the network will meet future
demand

30. Organization structure
Network planning
Analyzing network usage and traffic patterns and
planning network build out
Network operation
Keeping the network running and monitoring the
network failures
Network administration
Installing new devices / software
Customer (user) management
Interacting with the customers

31. Other thing are needed
Establishment of process and
operational policies, documentation of
operational procedures
Well-defined procedures
Well-defined workflow
Make management consistent and efficient
Collection of audit trails
Automatically logging activities of
operations

32. 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 of
disaster
Security emphasis
Networks potentially most vulnerable from the
inside
Limit the damage that can cause by one person

33. Management life cycle
Plan
Before the network system starts
During the network system is running

34. Management life cycle
Deploy
Installation of the equipment
Bootstrap mechanism to allow a device to obtain
and IP address and have layer2 or 3 connectivity
Operate
Monitoring/troubleshooting/performance tuning
and etc
Decommission
Old equipments (old technology) will be replace

35. TMN-layer: a management
hierarchy reference model

36. Management layer
TMN (telecommunication Management
network)
Network element
Element management
Network management
Service management
Business management

37. Network element
It means “the management agent “
It involves with
the management functionality
Communication pattern (protocols)

38. Element management
Involve managing the individual devices
and keep them running
Functions such as
to view and change a network element’s
configuration
To monitor alarm messages emitted from
elements
To instruct network elements to run self-
test

39. Network management
Concern with keeping the network
running as a whole (end-to-end)
Monitoring that involves ensuring that data
flow to reach destination with acceptable
throughput and delay
Managing multiple devices in a concerted
fashion

40. Service management
Managing the services that the network
provides and ensuring those services
are running smoothly
Let’s think as ISP (Internet service
provider)
?

41. Business management
Billing and invoicing
Help desk management
Business forecasting
Etc ?

42. 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
Network
Management
Fundamentals-
3m48