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N

ETWORK 

M

ANAGEMENT 

O

VERVIEW 

(cont’d)

7

043A/0996

T

H E  

N

E T W O R K

M

A N A G E M E N T  

D

I V I D E N D

So what does network management really
mean to your business, and what kind of
return on your investment can you expect?

Each time a network management
application prevents a failure, detects and
solves a potential problem, or increases
performance, you have gained a network
management “dividend.”  These dividends
translates into money in the form of time
and resources.

H

O W  

N

E T W O R K  

M

A N A G E M E N T  

W

O R K S

Network management employs a standard called Simple Network Management Protocol
(SNMP).  SNMP consists of two important components: agents and managers.  An agent is
software or firmware included with a network device, such as a repeater or router.  The agent
monitors a device’s operation, but does nothing else unless it detects an error or is polled for
information.  Software agents can be installed on PCs to report information such as available
hard disk space, memory usage and which applications are loaded.

A manager is a sophisticated software application that collects and processes information from
many agents.  It polls certain agents for information at regular intervals or only when requested.

The manager/agent relationship is similar to an office administrator and employees.  The
administrator may occasionally ask an employee, “How is your report coming along?” to which
the employee might respond, “It’s finished.”

Ideally, each employee answers favorably.  Occasionally, the administrator may find that one or
two employees may not have completed the work or were not present to answer the question.  The
administrator records these occurrences as faults and reports them to a higher authority.  In both
cases, the employee (agent) waits for the administrator (manager) to initiate the conversation
(polling).

As another example, an employee
might call the administrator to say
that he cannot find the information
necessary to complete his report.  In
this situation, the employee (agent)
initiates the conversation by reporting
a problem (trap) before the
administrator (manager) makes an
inquiry.  The relationship of the
manager and agents is illustrated in
Figure 8.

A device’s agent is typically accessed
using a management information base
(MIB).  A MIB contains device-
specific information that helps the management software work with an agent.

Typically, when you add a device to a network, you must load the device’s MIB into the
management software to manage the device.

Figure 7 - Impact of Network Management

Figure 8 - The Manager/Agent Relationship

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Содержание 167050-001 - Netelligent 5708 Switch

Страница 1: ... Solutions 12 The Internet Management Initiative 12 Components of the Web based Enterprise Management Standards Effort 13 Summary 13 Network Management Overview THE ROLE OF NETWORK MANAGEMENT IN STRUCTURED NETWORK ENVIRONMENTS As corporate networks continue to grow in size and complexity to what extent do IS professionals protect and manage their investments Surprisingly administrators of many lar...

Страница 2: ...R C H A N G E S T O T H I S P U B L I C A T I O N A N D T H E P R O D U C T S A N D S E R V I C E S D E S C R I B E D A T A N Y T I M E W I T H O U T N O T I C E O R O B L I G A T I O N This publication does not constitute an endorsement of the product or products that were tested The configuration or configurations tested or described may or may not be the only available solution This test is not...

Страница 3: ...e enables you to monitor network traffic and configure the network infrastructure accordingly For example you can use a network management application to maintain or increase performance by isolating segments that communicate infrequently Scenario As a network administrator you need to increase performance in the network by segmenting groups of users that do not need to communicate directly How do...

Страница 4: ...the proper tools small problems can often go undetected until they become major problems How will you address these situations Scenario A network user calls to inform you that his computer can no longer communicate with any of the servers on the network This type of problem frequently occurs on LANs of all sizes and configurations You could spend literally days troubleshooting the problem Where do...

Страница 5: ...ed network you can manage devices that are hundreds or even thousands of miles away without leaving your office letting you focus on the problem THE DISTRIBUTED MANAGEMENT APPROACH In large enterprise networks even the centralized approach has its shortcomings Trying to manage a network consisting of thousands of nodes from a single location requires massive computing power and generates a substan...

Страница 6: ...es down work ceases paralyzing mission critical operations and you are responsible for reacting to and resolving the situation How much does downtime cost When a network or a segment crashes every minute of downtime results in lost revenue and productivity Each year as we rely more on computers in our daily business losses from network downtime increase dramatically Figure 5 shows the estimated co...

Страница 7: ... only when requested The manager agent relationship is similar to an office administrator and employees The administrator may occasionally ask an employee How is your report coming along to which the employee might respond It s finished Ideally each employee answers favorably Occasionally the administrator may find that one or two employees may not have completed the work or were not present to an...

Страница 8: ...oprietary MIB Graphical Interfaces Most operations are greatly simplified by using a graphical representation of the device you want to manage by isolating the user from complex MIB groups Unlike a MIB browser performing most functions requires only a few clicks of a mouse button NETWORK MANAGEMENT PLATFORMS In recent years the network industry has agreed on standard management platforms For small...

Страница 9: ...evices WAN access points and connections to each device Simply drag and drop device icons and connect them to various LANs and WANs Device icons are polled regularly to determine if they are available on the network Active devices are highlighted in green devices that fail to respond are highlighted in red This gives you an immediate at a glance status of your network Double clicking on a Compaq N...

Страница 10: ...NETWORK MANAGEMENT OVERVIEW cont d 10 043A 0996 encompassing the map alarms and MIB browsers PMMs are product specific modules that add support for Netelligent repeater switch and router products ...

Страница 11: ...ty to manage any SNMP MIB II compliant device The MIB browser displays the MIB in a hierarchical format represented by trees branches twigs and leaves As you move through the MIB you can display any variable change values and graph them Graphing is available in two formats dial graphs and line graphs Starting a graph is as simple as choosing the MIB variables to graph determining the polling rate ...

Страница 12: ...t for open platform management solutions such as HP OpenView SunNet Manager IBM NetView 6000 and Novell ManageWise These platforms offer a wide array of management solutions for Windows and UNIX users and are considered the industry standard applications for medium to large networks Compaq understands the need to protect the investment of customers who have installed expensive network management p...

Страница 13: ...bilities recently outlined at a meeting of the Internet Engineering Task Force IETF HyperMedia Management Schema HMMS an extensible data model representing the managed environment HyperMedia Management Protocol HMMP a communication protocol embodying HMMS run over HTTP The HyperMedia Management Protocol has been presented to the IETF and is currently under discussion This schema will be defined ma...

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