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Compaq 167050-001 - Netelligent 5708 Switch, Overview

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N

ETWORK 

M

ANAGEMENT 

O

VERVIEW 

(cont’d)

3

043A/0996

N

E T W O R K  

M

A N A G E M E N T  

D

E F I N E D

Network management is a set of tools and processes that enables you to control, monitor, and
troubleshoot your network.  Some tools control the logical network, which can include servers,
user accounts and resources.  This paper discusses management of the physical network,
comprised of repeaters, switches, routers, cable plants, and network interface controllers.
Problems such as repeater and switch failure, intermittent cable operation, and incorrect
controller settings occur in the physical layer of the network.

Management of the physical network can be divided into two areas:  proactive and reactive tools.
Proactive tools help you anticipate and prevent problems.  Reactive tools help you identify and
solve problems once they occur.

P

R O A C T I V E  

N

E T W O R K  

M

A N A G E M E N T

Proactive network management is the most important aspect of network management.  It involves
actively searching the network for faults and monitoring the network’s performance and error
statistics, even though problems may not have occurred.  Like radar, proactive network
management informs you of the changing conditions in your environment, and alerts you to
serious problems on the horizon.

As your network grows, management software 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 you determine which users to
put on each segment?

Too frequently, network managers are forced to make an educated guess, implementing a
solution that may not work for all users.  A network management application provides a tool to
monitor the traffic flow as well as implement the new segmentation scheme.

Segmenting the network increases the overall performance of the network by isolating traffic on
each segment.  A router or bridge installed between the segments enables users to communicate
between segments when necessary.  As the network continues to grow in size and complexity,
you can use segmentation to maintain a smooth-running, structured network environment.

Figure 1 shows eight nodes in a flat,
unsegmented LAN.  Each node’s
transmission affects the overall
available bandwidth, and therefore
performance.  The repeater in the
diagram can be segmented (divided
into smaller, isolated networks).
However, without the benefit of
management software, it is difficult,
if not impossible, to determine how
best to segment the repeater.

Figure 1 - A flat unsegmented network

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Summary of Contents for 167050-001 - Netelligent 5708 Switch

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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 ...

Page 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 ...

Page 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...

Page 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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