Overview of Managing an Internetwork in Software

Maker EAN 13 in Software Overview of Managing an Internetwork

Overview of Managing an Internetwork
EAN-13 Creator In None
Using Barcode printer for Software Control to generate, create UPC - 13 image in Software applications.
Scan European Article Number 13 In None
Using Barcode scanner for Software Control to read, scan read, scan image in Software applications.
Network management is one of the hot topics of the internetworking world The idea of being able to control, optimize, and fix anything on a large, geographically dispersed internetwork from one central location is very appealing Applications that enabled a network manager to monitor, troubleshoot, and reconfigure remote network devices tended to be vendor-specific until the Simple Network Management Protocol (SNMP) came along We should not forget that many of the functions of network management can be accomplished without SNMP For example, we can use TFTP for configuration management, and Telnet for show and debug commands (Common commands of this type are covered in the Chap 8 section on "Troubleshooting") The fact that documentation of a particular device states that it supports SNMP does not mean that it will fit nicely into the network management system you are putting together We'll examine why in the next section on the components of an SNMP system
EAN / UCC - 13 Creation In Visual C#.NET
Using Barcode maker for .NET framework Control to generate, create GTIN - 13 image in .NET framework applications.
GTIN - 13 Creation In .NET Framework
Using Barcode creation for ASP.NET Control to generate, create EAN / UCC - 13 image in ASP.NET applications.
SNMP System Components
Printing European Article Number 13 In .NET Framework
Using Barcode generation for VS .NET Control to generate, create EAN 13 image in Visual Studio .NET applications.
Creating EAN-13 Supplement 5 In Visual Basic .NET
Using Barcode printer for VS .NET Control to generate, create EAN / UCC - 13 image in .NET framework applications.
SNMP version 1 is the most widely implemented version today Network management applications that fully support SNMP version 2 features are only now becoming available The basic subsystems of an SNMP v1 system are shown in Fig 7-17
Bar Code Maker In None
Using Barcode generation for Software Control to generate, create bar code image in Software applications.
Code 3 Of 9 Maker In None
Using Barcode creation for Software Control to generate, create Code 39 Full ASCII image in Software applications.
Figure 7-17: SNMP system components
Barcode Drawer In None
Using Barcode drawer for Software Control to generate, create bar code image in Software applications.
Generating Code 128B In None
Using Barcode maker for Software Control to generate, create Code 128 Code Set C image in Software applications.
Let's start our discussion with the Management Information Base The MIB is a database of objects arranged in hierarchical form, similar to that shown in Fig 7-18 The exact numbering of leaves in the MIB tree shown in Fig 7-18 is not important, because it is a fictitious tree; the issue is how the database stores, retrieves, and modifies values Each level in the hierarchy has containers numbered from 1 onward SNMP messages coming from a management station are of either the get type or set type If a management station needs to determine the status of the device's Serial 0 port, it will issue a get command followed by the string 1211 This periodseparated value identifies the value in the MIB hierarchy to be retrieved A management station can be used to set certain variables, such as setting a port from being administratively shut down to up by a similar mechanism of identifying the correct period-separated string for the variable that needs to be changed in the MIB hierarchy
Printing Universal Product Code Version A In None
Using Barcode creation for Software Control to generate, create UPC A image in Software applications.
Create EAN13 In None
Using Barcode generator for Software Control to generate, create EAN-13 Supplement 5 image in Software applications.
Figure 7-18: An example of a MIB hierarchy
Code11 Maker In None
Using Barcode generation for Software Control to generate, create Code11 image in Software applications.
Bar Code Decoder In Java
Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications.
If the documentation for a device tells you that it can be managed by SNMP, it may well mean that it has a MIB and a device agent (shown as the SNMP agent in Fig 7-17) to interpret SNMP strings Unless you want to spend hours writing programs to generate appropriate set, get, and other commands with the appropriate strings to follow the commands, you should check on whether the network management station application you intend to use has a management entity for the device in question A management entity is software that resides on the management station and provides a friendly interface for the user to request information or set variables on the remote device Cisco provides management entities for Cisco devices as part of CiscoWorks, its SNMP-based network management system
Draw EAN-13 Supplement 5 In .NET Framework
Using Barcode creator for Reporting Service Control to generate, create EAN / UCC - 13 image in Reporting Service applications.
Linear Drawer In C#.NET
Using Barcode generation for .NET Control to generate, create 1D image in VS .NET applications.
Systems Management Objectives
Barcode Scanner In VS .NET
Using Barcode Control SDK for ASP.NET Control to generate, create, read, scan barcode image in ASP.NET applications.
Barcode Creator In Java
Using Barcode generation for Android Control to generate, create bar code image in Android applications.
There are many models for network management, and here I'll present the short list of what you can reasonably be expected to achieve with current network management tools Centralized distribution of Cisco operating system software Centralized configuration management Event management for notifying an operator or other network administrator of the following: faults, attempted security breaches, performance failures (such as buffer overflow, overutilization of available bandwidth, excessive dropped packets, etc) Log generation for audit and review purposes
GTIN - 128 Maker In Objective-C
Using Barcode drawer for iPad Control to generate, create EAN / UCC - 13 image in iPad applications.
GTIN - 128 Reader In Visual Basic .NET
Using Barcode reader for .NET framework Control to read, scan read, scan image in .NET framework applications.
The big question when you're setting up a systems management system is: Do you collect information from remote devices by traps or by polling them A trap is generated when a device agent becomes aware that a monitored event, such as an interface going down, has occurred Collecting data via traps is risky, since it relies on the device and its line of communication to you being up and operational Polls, on the other hand, are initiated by the network management
being up and operational Polls, on the other hand, are initiated by the network management station and proactively request information from remote devices If the device does not respond, you have a pretty clear indication that something is wrong The problem with polling every device on the network for status of all its monitored variables is that the traffic generated can become too high for the internetwork to support This is a bigger problem the larger the network becomes Deciding how to split what you monitor via traps and what you monitor via polls is more of an art than a science, and it depends on the size of your internetwork, the interconnections in place, and the criticality of the various variables you wish to monitor A reasonable starting point might be to poll key devices on a fairly infrequent basis, say once every 10 minutes, to check that they are functioning and accessible, then set traps for more detailed alerts, such as individual links to remote sites going up or down If you really need to monitor specific MIB variables, such as dropped packets or bandwidth utilization, you have to poll the remote device for those particular values This can place an unacceptable burden on the bandwidth available for user traffic on a large and growing internetwork We ll revisit these issues in the section on the CiscoWorks management station For now, let s look at what we need to do on each router out in the field to bring it under the control of a centralized management system
Copyright © OnBarcode.com . All rights reserved.