MG-SOFT Corporation
Net Inspector 2015
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(Document Version: 10.6)
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copyrights, or other intellectual property.
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TABLE OF CONTENTS
1
Introduction ... 7
2
Starting Net Inspector Client ... 8
3
Connecting Net Inspector Client to Server ... 11
3.1 Connecting and Logging On to Server ... 11
4
Net Inspector Client GUI ... 14
5
Adding Managed Objects to Workspace ... 15
5.1 Discovering Network Devices and Adding Managed Objects to Workspace ... 15
5.1.1 Discovering Network Devices by Using the Network Discovery Wizard ...16
5.1.2 Discovering Network Devices by Using Discovery Panel Dialog Box ...22
Setting Discovery Parameters ... 22
Starting the Discovery Operation ... 28
5.2 Adding Managed Objects to Workspace Based on Received SNMP Notifications and NetFlow/sFlow Streams (Auto Configuration)... 29
5.3 Adding Maps and Managed Objects to Workspace Manually ... 32
5.3.1 Adding Maps to User View ...32
5.3.2 Adding Managed Objects to Maps ...34
5.3.3 Adding Connection Lines to Managed Objects ...39
5.4 Importing Managed Objects from CSV File ... 43
6
Configuring Polling Parameters ... 45
6.1 Configuring Polling Profiles ... 46
6.2 Configuring SNMP Profiles ... 54
7
Monitoring and Managing Alarms in Events Window ... 57
7.1 Viewing Alarms for All Objects ... 58
7.2 Viewing Alarms for Selected Objects ... 61
7.3 Viewing Alarm History ... 63
7.3.1 To View Alarm History for Selected Objects ...63
7.4 Filtering Alarms ... 65
7.5 Finding Alarms ... 69
8
Monitoring Alarms and Status of Managed Objects in Maps and Explorer
Windows ... 73
8.1 Viewing Contents of Maps in Maps Window ... 73
8.1.1 Viewing Link Status and Utilization ...76
8.1.2 Viewing Device Performance Tooltips ...77
8.1.3 Information Provided by Icons Displayed in Maps Window - Graphics View ...80
Types of Objects ... 80
New Alarms – Alarm Balloons ... 83
All Active Alarms – Alarm Rectangles ... 84
Example ... 85
8.2 Monitoring Propagated Alarms and Statuses in Explorer Window ... 86
8.2.1 Propagation Example ...87
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Viewing Properties of Managed Objects ... 88
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9.2 About the Properties window ... 89
9.2.1 General View ...89 9.2.2 System View ...90 9.2.3 Settings View ...92 9.2.4 Services View ...93 9.2.5 Interfaces View ...94 9.2.6 Resources View ...96 9.2.7 Storage View ...96
9.3 Viewing Device Performance Data in the Performance Statistics Window ... 98
10
Viewing Charts ... 100
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TABLE OF FIGURES
Figure 1: Entering URL into Web browser to view the Net Inspector Java Client Web page ... 8
Figure 2: Starting Net Inspector Client from a web browser ... 9
Figure 3: Using Java Web Start Launcher to start Net Inspector Client ... 9
Figure 4: Net Inspector Client main window (no connection to server) ... 10
Figure 5: Connect to Net Inspector Server dialog box ... 11
Figure 6: Login dialog box ... 11
Figure 7: Change Password dialog box ... 12
Figure 8: User view selection dialog box ... 13
Figure 9: Net Inspector Java Client main window (connection with server is established) ... 14
Figure 10: Network Discovery Wizard - Welcome screen ... 16
Figure 11: Network Discovery Wizard - Specify SNMP Profile(s) screen ... 17
Figure 12: Network Discovery Wizard - Configure Discovery Filter screen ... 18
Figure 13: Network Discovery Wizard - Select Discovery Strategy screen ... 19
Figure 14: Advanced Discovery Settings ... 20
Figure 15: Network Discovery Wizard – the last screen ... 21
Figure 16: Discovery Panel ... 23
Figure 17: Add Discovery dialog box ... 24
Figure 18: A new discovery operation in the Discovery Panel dialog box ... 27
Figure 19: A discovery operation in progress ... 28
Figure 20: A discovered network displayed in the Maps window ... 29
Figure 21: Setting Net Inspector auto configuration options ... 30
Figure 22: Viewing new managed objects added to the map by the auto configuration feature ... 31
Figure 23: Adding a new submap to a user view ... 32
Figure 24: Setting the name of the newly added submap ... 33
Figure 25: Example of a hierarchical structure of maps in the Explorer window ... 33
Figure 26: Opening a submap ... 34
Figure 27: Adding a new object to a map ... 34
Figure 28: Adding a new managed object – selecting the object type ... 35
Figure 29: Adding a new managed object – specifying object properties ... 35
Figure 30: A new managed object icon on the map and the managed object Properties window ... 37
Figure 31: Setting the profiles for polling a managed device ... 38
Figure 32: New object is being managed (its status is “Normal”)... 39
Figure 33: Connecting two icons with the Connection tool ... 40
Figure 34: Selecting the connection endpoint network interfaces ... 40
Figure 35: A connection line with interface status symbols and connection labels... 41
Figure 36: Editing the connection labels and endpoint interfaces ... 41
Figure 37: Example of a network model with connections lines (some of them with labels) ... 42
Figure 38: Selecting the Import from CSV File command ... 43
Figure 39: The list of managed objects (devices) to be imported from a CSV file ... 44
Figure 40: Net Inspector Server Settings dialog box, Profiles panel ... 45
Figure 41: New/Edit Polling Profile dialog box ... 46
Figure 42: New SNMP Profile dialog ... 54
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Figure 44: Events window and Event Details sub-window ... 58
Figure 45: Add Comment dialog box ... 59
Figure 46: Viewing alarm acknowledgement details ... 60
Figure 47: Opening a map from the Explorer window ... 61
Figure 48: Choosing the option to view active alarms for selected managed objects ... 62
Figure 49: A new tab in the Events window displaying active alarms for selected objects ... 62
Figure 50: Choosing the option to view alarm history for selected managed objects ... 63
Figure 51: Viewing the alarm history for selected objects ... 64
Figure 52: Create Filter dialog box ... 65
Figure 53: Viewing filtered alarms in the Events window ... 68
Figure 54: Find Events dialog box ... 69
Figure 55: Viewing results of the search operation in the Events window ... 72
Figure 56: Selecting a map view ... 73
Figure 57: Adjusting the zoom level ... 74
Figure 58: Viewing the contents of a map in the Maps window – Graphics view ... 74
Figure 59: Viewing the contents of a map in the Maps window – Details view ... 75
Figure 60: Enabling options to display connection labels and traffic ... 76
Figure 61: Connection lines and labels provide information about the current network traffic ... 77
Figure 62: Viewing the device performance tooltip ... 78
Figure 63: A pinned device performance tooltip window ... 79
Figure 64: Example of the Explorer window contents ... 87
Figure 65: Properties window – General view ... 88
Figure 66: Properties window – System view... 91
Figure 67: Properties window – Settings view... 92
Figure 68: Properties window – Services view ... 94
Figure 69: Properties window – Interfaces view ... 95
Figure 70: Properties window – Resources view ... 96
Figure 71: Properties window – Storage view ... 97
Figure 72: Opening Performance Statistics window for the selected device ... 98
Figure 73: Viewing device performance statistics ... 99
Figure 74: Selecting a chart from the Chart Panel dialog box ... 100
Figure 75: Viewing a chart ... 101
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INTRODUCTION
This guide contains instructions for completing basic operations in Net Inspector Java Client. Instructions are provided on a step-by-step basis, which should help the reader start using the software effectively.
It is supposed that you are familiar with basic actions in a graphical computer environment, such as choosing a main menu command or a pop-up command, selecting items, closing windows and dialog boxes, etc.
All program commands in this manual are written in bold and italic letters. Individual commands in combinations of commands are separated by the “/” character. For example:
View / Events – which means: click the “View” entry in the menu bar and select the
“Events” command from the “View” menu.
All hyperlinks in text are marked with blue colored letters, e.g., Events window. Clicking a hyperlink opens the page which the hyperlink points to.
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STARTING NET INSPECTOR CLIENT
Net Inspector Client is started via the Java Web Start mechanism, that lets you launch Net Inspector Client from any computer in the network using a Web browser, as described in this section.
System requirement: Java Runtime Environment (JRE), version 6.0 (a.k.a. 1.6)
or later must be installed on the computer that will run Net Inspector Client. JRE for various operating systems can be downloaded from the following Web page: http://www.java.com/en/download/manual.jsp
1. Start your Web browser application (e.g., MSIE, Mozilla Firefox, Opera, Safari, etc.) on the computer where you want to run Net Inspector Client.
Tip: To run Net Inspector Client on the same computer as Net Inspector Server, select the
MG-SOFT Net Inspector/Net Inspector Client command from the operating system start
menu. Skip the following step and continue in step 3 below.
2. Into the Web browser URL input line enter the IP address and port (separated by a colon) on which the Net Inspector HTTP Server listens to for incoming HTTP connections (by default, the port number is 5228 ) and press the Enter key (Figure 1).
Note: Net Inspector comes with its own HTTP (Web) server program that installs to the same computer as Net Inspector Server and other components of the package. Net Inspector HTTP Server serves a Web page that enables launching Net Inspector Client by using the Java Web Start framework.
Figure 1: Entering URL into Web browser to view the Net Inspector Java Client Web page
3. Net Inspector Client Web page is displayed in the Web browser. Click the Start
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Figure 2: Starting Net Inspector Client from a web browser
4. Web browser may prompt you with dialog box asking if you want to start Net Inspector Client (i.e., ni.jnlp file) with Java Web Start Launcher. Click the OK button to confirm the selection (Figure 3).
10 5. Java Web Start Launcher downloads the Net Inspector Client application from the
Net Inspector Client Web page to the local computer. When starting Net Inspector Client for the first time on a given computer, the software also offers you the option to create a desktop shortcut for the downloaded Net Inspector Client application. Select the Yes option to create the shortcut. When the Net Inspector Client application finishes downloading, it is automatically started and the Net Inspector Client main window appears (Figure 4).
Figure 4: Net Inspector Client main window (no connection to server)
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CONNECTING NET INSPECTOR CLIENT TO SERVER
Before you can start using Net Inspector Client for effective fault management, you need to connect and successfully log on to Net Inspector Server, as described in this section.
3.1 Connecting and Logging On to Server
1. In the Net Inspector Client main window choose the File / Connect command or click the Connect toolbar button.
2. The Connect to Net Inspector Server dialog box appears (Figure 5), which is used for connecting Net Inspector Client to Net Inspector Server.
Figure 5: Connect to Net Inspector Server dialog box
3. In the Address drop-down list in the Connect to Net Inspector Server dialog box, enter or select the IP address or the hostname of the computer that runs Net Inspector Server (engine) you wish to connect to.
4. Into the Port input line, enter the TCP port number on which the Net Inspector Server listens to for incoming client connections. The default port number is 5221. 5. Click the Connect button. Net Inspector Client will try to establish a connection with
the Net Inspector Server using the connection settings configured above.
12 6. Once the connection is established, the Login dialog box appears (Figure 6). Enter
your username and password into the Username and Password input fields (note that both fields are case sensitive!).
Note: The Design mode checkbox lets users with administrator access rights run Net
Inspector Client in design mode, whichallows users to have more than one user view active at the same time an copy objects between active user views.
7. Click the Login button (Figure 6).
8. Net Inspector Server checks if the account with the specified username exists and if the entered password is correct. The login procedure then proceeds as follows:
If the entered username and/or password is incorrect, the Login dialog box is displayed again, so you can re-enter the login data.
If the entered username and password are correct and the user account is configured so that the user must change the password upon next login, the Change Password dialog box appears (Figure 7). This dialog box lets you change your password by entering the old password into the Old password input line and a new password into the New password and Retype password input lines and clicking the Change button.
Figure 7: Change Password dialog box
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Figure 8: User view selection dialog box
If the entered username and password are correct and there is more than one
user view assigned to the user, the user view selection dialog box appears (Figure 8). Select the desired user view from the dialog box and click the Open button. One or more windows (depending on the user view configuration) will open in the Net Inspector Client main window. You can start working with Net Inspector in accordance with the selected user view and assigned access rights.
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4
NET INSPECTOR CLIENT GUI
The Net Inspector Client graphical user interface (GUI) is composed of typical graphical user interface components, like the title bar, menu bar, toolbar, one or more windows and the status bar. The following windows form the Net Inspector Client main window:
Maps
Explorer
Events
Event Details
The above listed windows are arranged side-by-side in the main window. Windows can be resized by dragging their borders. All windows listed above, except the Maps window which is always displayed, can be displayed or hidden by using the View menu commands or the corresponding toolbar buttons. Additional windows and dialog boxes can be opened from the program menu, toolbars and the pop-up (context) menus.
Figure 9: Net Inspector Java Client main window (connection with server is established)
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ADDING MANAGED OBJECTS TO WORKSPACE
After logging on log on Net Inspector Server, network administrator needs to configure Net Inspector workspace. The workspace is a conceptual environment that allows you to model the managed network according to your preferences. It allows you to group managed objects in maps and to structure such maps in a hierarchical manner within user views, e.g., to depict the logical topology of the managed network.
A user view is a particular view of objects registered with the Net Inspector system. User views differ in respect to what objects they display and how those objects are grouped and hierarchically structured. A user view can display either all managed, action and system objects registered with Net Inspector (e.g., an administrator user view), or any subgroup of those objects (e.g., user views assigned to users with limited access rights). An object can be displayed (included) in more than one user view. A user view displays only those alarms, which are associated with the objects included in that user view. See also section About Users, Access Rights and User Views.
To start managing the network, a user with administrator access rights needs to add the managed objects that represent actual network devices to Net Inspector configuration, add those objects to the workspace and enable their monitoring. One can create different user views for different users. Managed objects can be added to the workspace either manually or by using the Net Inspector network discovery functionality.
In this section network administrators will learn how to add maps and managed objects to the workspace. There are several ways to add managed objects to the workspace in Net Inspector, as described in this section:
First, you will learn how to use the Network Discovery Wizard and the Discovery Panel window to discover devices on the network and add managed objects that represent discovered devices to the Net Inspector workspace. Next, you will learn how to set the auto configuration feature to enable adding of new managed objects to the workspace by receiving SNMP notifications and NetFlow/sFlow streams from the network. Next, you will learn how to add, configure and enable managed objects on the workspace manually. Finally, a process of importing managed objects from a CSV file is described.
5.1 Discovering Network Devices and Adding Managed Objects to
Workspace
Managed objects can be added to the workspace automatically by means of the
network discovery operation that actively scans and discovers the network and by
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5.1.1 Discovering Network Devices by Using the Network Discovery Wizard
This section describes how to use the Network Discovery Wizard to configure and run a discovery operation and add the discovered devices to the workspace (default user view). The Network Discovery Wizard starts automatically when you connect to Net Inspector Server for the first time (i.e., when no managed objects exist in Net Inspector configuration). You can also start the Network Discovery Wizard at any time later, as described in this section.
To discover devices on the network:
1. Connect to Net Inspector Server as a user with administrator access rights (e.g., admin).
2. If the Network Discovery Wizard Welcome screen does not appear automatically, use the Tools / Discovery Wizard command to display it (Figure 10).
Figure 10: Network Discovery Wizard - Welcome screen
17 4. In the Specify SNMP Profiles screen, you need to select the SNMP access profiles
that will be used for discovering the network devices. Please note that the SNMP access profile with which a device has been discovered, is automatically assigned to that device, so Net Inspector Server will use it to poll that device.
Note: The order in which SNMP profiles are listed is important. During the discovery, the
top-listed SNMP profile is used first in an attempt to discover your network devices, if unsuccessful, the second-listed profile is used, etc. The SNMP profile with which a device has been discovered is automatically used for the subsequent polling of that device. It is recommended to move more secure SNMP profiles (e.g., SNMPv3 profiles) to the top of the list.
Figure 11: Network Discovery Wizard - Specify SNMP Profile(s) screen
To use a profile in the discovery operation, enable it by checking the checkbox in front of its name in the SNMP profiles list. You should enable those profiles that contain the SNMP settings accepted by your SNMP devices (SNMP version, port, community name, or SNMPv3 user settings).
To create a new profile and add it to the list, click the Add button and configure the parameters for the new profile in the New SNMP Access Profile
dialog box that appears.
To edit a profile, select it in the list, click the Edit button and edit the profile parameters in the Edit SNMP Access Profile dialog box that appears.
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To move a profile up or down on the list, select the profile and click the Up or
Down button, respectively.
5. After you have selected the desired SNMP profile(s), click the Next button at the bottom of the screen to proceed to the next step.
6. The Configure Discovery Filter screen appears (Figure 12). In this step you can optionally select or configure a filter that will narrow down the discovery results by filtering out devices that do not match the filter criteria. To skip using a discovery filter, leave this screen empty or select the <No Filter> entry from the Discovery filter drop-down list. To configure the filter, follow the instructions displayed by the wizard. For more details, please refer to the Net Inspector Client Reference Manual, “Manage Discovery Filters dialog box” section.
Figure 12: Network Discovery Wizard - Configure Discovery Filter screen
19 8. In this step of the Network Discovery Wizard, you need to select one of the
following strategies for discovering your network (Figure 13):
Figure 13: Network Discovery Wizard - Select Discovery Strategy screen
To perform the discovery operation within the subnet, which the Net Inspector Server computer is a member of, select the Scan local subnet radio button.
To perform the discovery operation within the user-specified range(s) of IP addresses, select the Scan IP range(s) option.
Click the Add button next to the list of IP ranges. Into the IP Range dialog box that appears, enter the first and the last IP address of the range, which you want to scan for network devices. Optionally, repeat this procedure to add more IP ranges to the list.
Optionally, use the Delete and Edit buttons to edit or delete the selected IP ranges.
To use the progressive network discovery operation that starts querying a single SNMP device and progressively discovers its neighbors and subnets, select the Progressive network discovery option.
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Check the Scan entire subnets (not larger than B class) checkbox if you want the Net Inspector to scan entire subnets (up to B-class size) it detects during the progressive discovery operation (this might be time consuming). Note that independently of this setting, Net Inspector always scans entire C-class subnets it discovers, and never scans entire subnets that are larger than B-class.
To limit the depth of the progressive discovery operation to a specific number of hops, click the Advanced button, and set the number of hops into the TTL (Time-to-Live) input line in the Advanced Discovery Settings
dialog box (Figure 14).
9. If you do not want the discovered devices and their interconnections to be added to the default user view, click the Advanced button at the bottom of the Select Discovery Strategy screen.
10. The Advanced Discovery Settings dialog box appears (Figure 14).
Figure 14: Advanced Discovery Settings
From the Target user view drop-down list, select the user view to which you want the discovered devices (managed objects) and their interconnections to be added.
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Check the Create submaps for subnets checkbox if you want Net Inspector to automatically create subnet maps and put the discovered devices into subnet maps when devices are added to the selected user view.
Check the Preserve connections checkbox if you want Net Inspector to preserve manually added connections between managed objects when adding discovered managed objects and their interconnections to the submap. This option is relevant only if the target submap already contains (some) managed objects and connections between them.
In the Connection labels drop-down list, select what information will be displayed in connection labels. You can choose to display the IP address or the name or the IP address and name of the endpoint network interface. One can hide the connection labels later by clicking the Connection labels checkbox in the graphics toolbar.
Check the Display tunnel connections checkbox if you want Net Inspector to display also the discovered tunnel connections between managed objects.
Click the OK button to apply the settings and close the Advanced Discovery Settings dialog box.
For more details about the advanced discovery parameters, please see the next section.
11. Click the Next button at the bottom of the screen to proceed to the final step. 12. In the final step (Figure 15) you can review the discovery settings and start the
discovery operation.
22 13. After you have reviewed the discovery settings, click the Start Discovery button at
the bottom of the screen to start the network discovery operation and finish the Network Discovery Wizard.
14. While the discovery operation is in progress, the Discovery is running message and a progress bar is displayed in the status bar of the Net Inspector Client main window.
To view the intermediate results (discovered devices and subnets) of the discovery operation, select the Tools / Discovery Panel command to display the Discovery Panel dialog box (Figure 16) and open the relevant discovery operation in it.
When the discovery operation finishes, the newly discovered devices are automatically added to the selected user view (Figure 20).
5.1.2 Discovering Network Devices by Using Discovery Panel Dialog Box
This section describes how to discover network devices without using the Network Discovery Wizard.
Note: Before running the discovery operation, it is recommended to enable SNMP on all switches and routers in your network. This enables discovering the physical network topology.
Users with administrator access rights are permitted to open the Discovery Panel dialog box to view and manage discovery operations, as well as add discovered devices and their interconnections to the workspace and to the system (Device Panel dialog box).
Discovery operation is a procedure that systematically scans the network for network
devices and their (inter)connections by means of ICMP ping and/or SNMP queries. The search is performed in accordance with the user-specified discovery parameters. Net Inspector supports three different network discovery methods:
local - discovers the network (devices and their connections) within the local subnet
range - discovers the network within the specified range of IP addresses
progressive - discovers the network by means of the progressive SNMP-based network scan operation. This operation starts by querying one SNMP device and continues by progressively discovering its neighbors and subnets by examining the routing tables and other relevant data on scanned objects.
More than one discovery operation can exist and run simultaneously in Net Inspector (e.g., each discovery operation being performed on a different part of the network, storing results to different configuration database and adding devices to different user views).
Setting Discovery Parameters
To discover network devices without using the Network Discovery Wizard: 1. Select the Tools Discovery Panel command from the main menu.
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Figure 16: Discovery Panel
3. Click the Add button in the Discovery Panel dialog box, to add a new discovery operation to the Discovery Panel.
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Figure 17: Add Discovery dialog box
Into the Name input line, enter the name (short description) of the discovery operation you are adding.
If you want to enable running the discovery operation repeatedly every day at the same time, check the Run discovery every day at checkbox in the
Schedule frame and enter the corresponding hours and minutes into the
accompanying input lines. If this option is enabled in combination with the
Automatically add discovered devices option, Net Inspector will
automatically add the newly discovered devices in each run to the selected user view and start monitoring them.
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Configuration (drop-down list)
Lets you select the configuration file, which the discovered devices will be stored in. Select the Config0 option.
User view (drop-down list)
Lets you select the user view, which the discovered devices will be added to. Select the default option.
Submap (drop-down list)
Lets you select or enter the name of the target submap, i.e., submap, which the discovered devices and their interconnections will be added to. If the specified submap does not exist yet, it will be created.
Preserve connections (checkbox)
Check this checkbox if you want the Net Inspector to preserve manually added connections between managed objects when adding discovered managed objects and their interconnections to the submap. This option is relevant only if the target submap already contains (some) managed objects and connections between them.
Connection labels (drop-down list)
select what information will be displayed in connection labels, i.e., labels on the ends of lines connecting managed objects. You can choose to display the IP address or the name or the IP address and name of the endpoint network interface. One can hide the connection labels later by clicking the
Connection labels checkbox in the graphics toolbar. Display tunnel connections (checkbox)
checkbox if you want Net Inspector to display also the discovered tunnel connections between managed objects.
Discovery filter (drop-down list)
Lets you select a discovery filter in order to discover only those devices that match the filter conditions. Select the <no filter> option.
For more details, please refer to the Net Inspector Client Reference Manual, “Manage Discovery Filters dialog box” section.
In the Strategy frame, specify the preferred discovery strategy, as follows:
ICMP Ping (checkbox)
Check this checkbox to enable using ICMP Ping queries for discovering the network devices.
SNMP (checkbox)
Check this checkbox to enable using SNMP queries for discovering the network devices and their interconnections.
Scan ENTITY-MIB (checkbox)
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Scan local subnet (radio button)
If this option is selected, Net Inspector discovers the network (devices and their connections) within the local subnet, i.e., subnet the computer running Net Inspector Server is a member of.
Scan IP range(s) (radio button)
If this option is selected, Net Inspector discovers performs the discovery operation within the specified IP range(s). To add the desired IP ranges use the following controls:
Add (button)
Click this button to open the IP Range dialog box, where you can specify the IP range into the following input lines:
Start address (input line)
The start address of the IP range.
Stop address (input line)
The end address of the IP range.
Delete (button)
Deletes the selected range.
Edit (button)
Opens the IP range dialog box where you can edit the selected range.
Progressive network discovery (radio button)
The Progressive network discovery starts by querying a single SNMP device and progressively discovers its neighbors and subnets by examining the routing tables and other relevant data on scanned objects. You have to enter the IP address of the SNMP device to be scanned first.
SNMP agent address (input line)
The IP address of the SNMP-enabled device that will be scanned first.
Scan entire subnets (not larger than B class) (checkbox)
If this checkbox is checked and Net Inspector discovers a device that has a network mask that is larger than traditional class C network mask and does not exceed the size of class B mask, it will scan also the entire subnet, which the discovered device is a member of (this can be time consuming). Note that Net Inspector will always scan entire C class subnets it discovers, however, it will not scan entire subnets that are larger than B class.
Click the Advanced button to open the Advanced Discovery Settings dialog box where you can specify advanced discovery parameters, as follows:
Timeout (input line)
Sets the timeout interval in seconds for ICMP ping and SNMP requests.
Retries (input line)
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TTL (input line)
Sets the time-to-live parameter that limits the lifetime of discovery packets to the specified number of hops (number of routers over which the discovery packets will be passed. This parameter is important for limiting the depth of the SNMP scan discovery operation.
Max queue size (input line)
Specifies the maximum number of concurrent SNMP queries. By using this parameter, you can control the CPU usage and the speed of discovery. By increasing this number, the CPU load and speed will increase and vice-versa.
After viewing/modifying the above parameters, click the OK button to close the Advanced Discovery Settings dialog box and apply the settings.
In the SNMP Profiles frame, check the Use all configured SNMP profiles checkbox. This way, all existing SNMP profiles will be used in the discovery operation. First, the network will be scanned using the SNMPv3 profile(s), then using the SNMPv2c, and finally by using the SNMPv1 profile(s). Every managed object will be automatically assigned that SNMP profile with which is has been discovered. If the required SNMP profile for accessing your network devices does not exists yet, you should create it in the Server Settings dialog box, Profiles panel before starting the discovery operation. If the Use all configured SNMP profiles checkbox is not checked, you can specify what SNMP profiles will be used in the discovery operation and in which order. For more details, please refer to the Net Inspector Client Reference Manual, “Discovery Panel dialog box” section.
5. After specifying the discovery parameters, click the OK button to close the Add Discovery dialog box and add the newly configured discovery operation to the Discovery Panel (Figure 18).
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Starting the Discovery Operation
Note: Before running the discovery operation, it is recommended to enable SNMP on all switches and routers in your network. This enables discovering the physical network topology.
1. To start the discovery operation, select it in the Discovery Panel dialog box and click the Start toolbar button.
2. To see the results, select the discovery operation in the Discovery Panel dialog box and click the Discovery results button.
3. The Discovery dialog box for the selected discovery operation appears (Figure 19).
Figure 19: A discovery operation in progress
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You can close the Discovery dialog box and the Discovery Panel dialog box and leave the discovery operation running in the background. While the discovery operation is running, the Net Inspector Client status bar displays the Discovery is running message and a progress bar. You can re-open those dialog boxes at any time to view the status and most recent discovery operation results.
If you want to stop the discovery operation before it finishes, click the Stop button in the Discovery Panel dialog box.
5. When the discovery operation is finished or stopped, the managed object icons representing discovered devices are automatically added to the workspace (if the
Automatically add discovered devices option is enabled in the discovery
operation configuration). More specifically, managed objects are added to the selected user view in the Maps window and Net Inspector starts automatically monitoring those devices. Managed objects are also connected with lines that represent connections between them (Figure 20).
Figure 20: A discovered network displayed in the Maps window
5.2 Adding Managed Objects to Workspace Based on Received
SNMP Notifications and NetFlow/sFlow
Streams (Auto
Configuration)
30 SNMP notification messages and NetFlow/sFlow messages. This section describes the auto configuration feature settings and functioning.
1. To determine if auto configuration is enabled, select the Tools / Server Settings command and click the Auto Configuration entry in the navigation tree in the Server Settings dialog box to display the Auto Configuration panel (Figure 21). 2. In the Auto Configuration panel, make sure the Add devices on received SNMP
notifications from unknown sources to configuration checkbox is checked and the
correct configuration is selected in the accompanying drop-down box (e.g., Config0). Check also the Add devices to user view checkbox to enable adding managed objects for newly discovered devices to the selected user view. In the accompanying drop-down list select the user view which managed objects will be added to and optionally, enter the name of the map which the devices will be added to into the accompanying map input line. If the map input line is left empty, managed objects will be added to the root of the selected user view.
Figure 21: Setting Net Inspector auto configuration options
3. Ensure the Add devices on received NetFlow streams from unknown sources to
configuration checkbox is checked and the correct configuration is selected in the
accompanying drop-down box (e.g., Config0). Check also the Add devices to user
view checkbox to enable adding managed objects for newly discovered
NetFlow/sFlow devices to the selected user view. In the accompanying drop-down list select the user view which managed objects will be added to and optionally, enter the name of the map which the devices will be added to into the accompanying map input line. If the map input line is left empty, managed objects will be added to the root of the selected user view.
4. Click the OK button to apply the changes and close the Server Settings dialog box. 5. Configure remote SNMP devices to send SNMP Trap or Inform notifications
messages to the computer where Net Inspector Server runs. In case of a distributed configuration where two or more Net Inspector polling engines are used, direct the SNMP notification sending to the nearest polling engine.
31 7. Net Inspector will automatically add a new managed object to the system (Device
Panel) and to the workspace (user view and map) when it receives an SNMP Trap and Inform notification message or NetFlow/sFlow packets from a new device. Net Inspector will check the SNMP version and community name or username (in case of SNMPv3) in the received SNMP Trap or Inform notification message and assign the matching SNMP access profile (if it exists) to the new managed object. If no SNMP profile with matching SNMP access parameters exists in Net Inspector, the “default” SNMP profile is selected. In addition, the “default” polling profile is automatically assigned to all new managed objects. Managed objects that have been automatically added to the system are marked with the “New” label displayed in the upper-left corner of the managed object icon. New Netflow managed objects are also marked as NetFlow sources with the “NF” label displayed in the lower-left corner of the managed object icon (Figure 24).
Figure 22: Viewing new managed objects added to the map by the auto configuration feature
8. To remove the “New” label from managed objects, right-click the respective managed object(s) and choose the New Device toggle command from the pop-up menu.
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5.3 Adding Maps and Managed Objects to Workspace Manually
In addition to using the network discovery and auto configuration feature, users with administrator access rights may add maps and managed objects to the system and to the workspace also manually.
Furthermore, action objects (Mail, Command, and SMS) and graphic objects (lines, rectangles, artistic text, etc.) can be added to the workspace only manually.
This section will show you how to manually create maps on the workspace and how to place managed objects on these maps.
5.3.1 Adding Maps to User View
Net Inspector uses the concept of maps, which are containers that can hold various types of objects (managed objects, system objects, action objects), graphic elements (lines, rectangles, bitmaps, etc.) and other maps (submaps).
Using the maps, one can group objects into maps and structure such maps in a hierarchical manner within user views.
After a fresh installation, Net Inspector workspace contains only the “default” user view and no maps. This section describes how to add maps to the default user view.
1. If the Explorer window is not displayed, select the View / Explorer command or click the Explorer toolbar button to display it.
2. Select the default user view icon in the Explorer window, right-click it and select the Add/New Submap command from the pop-up menu (Figure 23).
33 3. A new submap icon with the default name Submap 1 will appear below the
selected user view icon in the Explorer window and the Submap – Properties window is automatically displayed prompting you to specify a different name for the newly created submap (Figure 24).
Figure 24: Setting the name of the newly added submap
4. Into the Name input line in the Submap – Properties window, enter the desired name for the new submap and click the Apply button (Figure 24). Close the Submap – Properties window.
5. By following the above procedure, you can add more (sub)maps to the user view, e.g., to create a hierarchical structure of maps according to your preferences (e.g.: Figure 25).
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5.3.2 Adding Managed Objects to Maps
1. If the Explorer window is not displayed, select the View / Explorer command or click the Explorer toolbar button to display it.
2. In the Explorer window navigate to the (sub)map to which you would like to add managed objects and double-click the submap or right-click it and select the Open pop-up command (Figure 26).
Figure 26: Opening a submap
3. A new tab appears in the Maps window, displaying the contents of the opened (sub)map. Right-click inside this map in the Maps window and choose the
Add/New Object command from the pop-up menu (Figure 27).
35 4. The New Object dialog box – first screen appears. Select the type and class of the
object that best match the device you are going to manage (e.g., IP server) and click the Next button at the bottom of the dialog box (Figure 28).
Figure 28: Adding a new managed object – selecting the object type
5. The New Object dialog box – second screen appears (Figure 29). Specify the properties of the managed object you are adding, as follows:
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Into the Name input line, enter the name of the managed object, as it will appear in Net Inspector.
Into the Address input line, enter the IPv4 or IPv6 address or the fully qualified domain name of the managed object.
Into the Description input line, optionally enter a short description of the managed object.
Into the Vendor input line, optionally enter the vendor of the managed device.
From the Class drop-down list, select the class of the managed object, which can be one of the following:
Workstation Server Printer Switch Router Gateway Equipment Multiplexer Transport Database Firewall Transmitter Any
In the Submap drop-down list, the currently selected submap is displayed. If you wish to add the object to another submap, click the Browse button next to this drop-down list and select the desired submap from the Browse dialog box that appears.
In the Configuration drop-down list, the name of current device configuration file is displayed (e.g., Config0). If you want to save the new object to another configuration file (must first be specified in the niengine.ini file – please see the Net Inspector Installation and Configuration Guide), select it from this drop-down list.
In the Polling engine drop-down list, select the IP address of the Net Inspector Performance Manager polling engine that will be used for polling the given device, or select the Built-in engine option in order for Net Inspector Server (fault manager) to poll the given device. The former option is available when using Net Inspector WorkGroup or Enterprise Edition, which include the Performance Management functionalities. If you select a Performance Manager polling engine in this drop-down list, additional performance statistics about the given device will be available via the Show Performance Statistics command. If you select the Built-in engine option, no performance history data will be available for the given managed object. 6. After specifying the properties of the managed object, click the Finish button in the
37 Panel dialog box (View/Device Panel), which lists all objects registered with Net Inspector.
7. A new managed object icon is added to the selected map and the Properties window of the managed object appears automatically (Figure 30). Note that the monitoring of the managed object is not yet enabled (indicated by the blue color of the managed object icon background). One needs to assign the correct polling profile and SNMP access profile to the new managed object before enabling its monitoring, as describe in the next steps.
Figure 30: A new managed object icon on the map and the managed object Properties window
8. Select the Settings entry from the category drop-down list displayed in the upper section of the Properties window (Figure 30).
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Figure 31: Setting the profiles for polling a managed device
From the Polling profile drop-down list select the name of polling profile that will be used for polling the managed object. A polling profile controls what parameters will be monitored and what are the threshold values for triggering and clearing alarms. To view the details of existing polling and SNMP access profiles, click the Manage Profiles button and view the details of existing profiles in the Manage Profiles dialog box. If the polling profile you want to use does not exist yet, you can create it in the Manage Profiles dialog box.
From the SNMP access profile drop-down list select the name of SNMP access profile that will be used for polling the managed object. An SNMP access profile contains a set of parameters for accessing SNMP agents on managed objects. To view the details of existing polling and SNMP access profiles, click the Manage Profiles button and view the details of existing profiles in the Manage Profiles dialog box. If the SNMP access profile you want to use does not exist yet, you can create it in the Manage Profiles dialog box. 10. After setting the profiles for polling the managed object, apply the changes by
clicking the Apply button ( ) in the managed object Properties window toolbar. 11. Finally, enable monitoring of the managed object by clicking the Enable button ( )
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Figure 32: New object is being managed (its status is “Normal”)
12. Close the managed object Properties window.
Tip: For instructions on viewing the statuses of managed objects an managing alarms associated with them, please refer to the section Monitoring Alarms and Status of Managed Objects in Maps and Explorer Windows.
5.3.3 Adding Connection Lines to Managed Objects
1. In the Explorer window or in the Maps window, double-click the (sub)map that contains the objects you would like to connect with connection lines. The contents of the opened (sub)map is displayed in the new tab in the Maps window.
Tip: If the map is currently displayed in the Details view, select the Graphics entry from the toolbar drop-down list to switch to the Graphics view.
2. In the Graphics toolbar, click the Lock/Unlock button ( ) to unlock the map for editing.
40 3. In the Graphics toolbar, click the Connection tool button ( ).
4. To add a connection line, click the first device icon in the Maps window, move the mouse pointer to the second (target) device icon and click it (Figure 33).
Figure 33: Connecting two icons with the Connection tool
5. A connection line appears between the two icons and the Interfaces dialog box (Figure 34) is displayed that lets you Select the network interfaces used on both ends of the connection (if this information is available via SNMP).
Tip: A connection endpoint network interface can be selected only if the corresponding device supports SNMP, if it implements the standard SNMP MIB-II interfaces table (ifTable), and if SNMP monitoring/Network interfaces option is enabled in the polling profile assigned to the device.
Figure 34: Selecting the connection endpoint network interfaces
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Figure 35: A connection line with interface status symbols and connection labels
Tip 1: If you wish to disable displaying interface status nodes on connections in the current map in the Maps window, uncheck the Interface nodes checkbox in the Graphics toolbar.
Tip 2: To disable displaying connection labels on connections in the current map in the Maps window, uncheck the Connection labels checkbox in the Graphics toolbar.
7. A connection line can have 3 labels: left, right and center label. Labels are used, for example, for naming the connection and its endpoint interfaces/addresses. To add connection labels to a connection or to edit connection labels, double-click the connection line with the selection tool ( ) to open the Connection Labels dialog box and configure labels in it (Figure 36). Optionally, edit the connection endpoint interfaces by selecting different interfaces from the Source and Target drop-down lists in the Connection Labels dialog box.
Figure 36: Editing the connection labels and endpoint interfaces
42 9. Repeat the procedure above to add additional connection lines to objects in the
Maps window, Graphics view. Connection lines enable modeling the physical and logical topology of the network. See an example in figure below.
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5.4 Importing Managed Objects from CSV File
Users with administrator access rights can import managed objects (devices) from a CSV (comma separated value) file and add them to the system and to the currently active map in the Maps window. Imported objects appear also in the Device Panel dialog box.
The CSV file should contain the following data about the devices (one line per device): Device IP address, device name, polling profile, SNMP profile, PM polling engine
Allowed data separator characters: , ; | Import rules:
1) Only one attribute for each device may be used, which must be IPv4 or IPv6 address 2) If more than 5 attributes are present for each device, only the first 5 will be used 3) All the missing attributes will be replaced with the default values
To import managed objects from a CSV file:
1. In the Explorer window navigate to the (sub)map to which you would like to add managed objects and double-click the submap or right-click it and select the
Open pop-up command (Figure 26).
2. A new tab appears in the Maps window, displaying the contents of the opened (sub)map. Right-click inside this map in the Maps window and choose the Add/
Add / Import from CSV File command from the pop-up menu (Figure 38).
Figure 38: Selecting the Import from CSV File command
44 4. The Import from CSV File – Available Devices dialog box (Figure 39) appears that
lets you view and edit the list of managed objects (devices) contained in the selected CSV file:
To edit the polling profile, SNMP profile or Performance Manager polling engine of a managed object, click inside the respective field in the list to display the drop-down list and select a different entry from the drop-down list (Figure 39).
To modify an attribute of two or more managed objects at the same time, select the objects in the list and click the Modify selected button and then choose the desired polling profile, SNMP profile or Performance Manager polling engine from the corresponding drop-down lists in the dialog box that appears.
To remove a managed object from the list, select it in the list and click the
Remove button.
To add a managed object to the list, click the Add button. This adds a new line to the list of managed objects. Specify the missing attributes of the managed objects (IP address, name, polling profile, SNMP profile, polling engine).
Check the Poll imported devices checkbox in order for Net Inspector to start immediately monitoring devices after importing them.
Figure 39: The list of managed objects (devices) to be imported from a CSV file
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6
CONFIGURING POLLING PARAMETERS
Users with administrator access rights are allowed to configure parameters that control device polling. These parameters are grouped in two types of profiles:
A SNMP access profile contains parameters for accessing SNMP agents on managed objects (e.g., SNMP version, community name, etc.).
A polling profile contains parameters for polling managed objects by means of ICMP and SNMP protocols (e.g., polling categories, intervals, thresholds, etc.).
Polling and SNMP profiles are configured in the Profiles panel of the Server Settings dialog box (Figure 40) in Net Inspector Client.
Once a new SNMP or polling profile is created, it can be assigned to a managed device in the managed object Properties window, Settings view (Figure 31).
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6.1 Configuring Polling Profiles
1. In Net Inspector Client, select the Tools / Server Preferences command from the main menu to display the Server Preferences dialog box (Figure 40).
2. Click on the Profiles option to display the profiles.
3. To create a new polling profile, click the Add button in the Polling tab of the Profiles panel. The New Polling Profile dialog box appears (Figure 41), where you can configure a new polling profile, using the following controls:
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Name (input line)
The name of the polling profile. This is a label under which all the settings in this dialog are saved.
Check every (input line)
Specifies the interval in seconds for checking the managed object status and SNMP agent state (i.e., ICMP Echo and “SNMP Ping” polling).
Poll every (input line)
Specifies the interval for polling network services (SNMP, HTTP, IMAP, DNS; SSH, etc.) in seconds. Therefore, this setting also controls the interval for monitoring parameters that are collected through SNMP, except those SNMP parameters for which separate polling interval is configured below.
Resync Interval (2 input lines)
Specifies the interval in hours and minutes for automatic alarm resynchronization (if both input lines contain 0 (zero), the automatic alarm resynchronization is disabled).
Timeout (input line)
Specifies the timeout value in seconds. This value determines how long Net Inspector Server will wait for a response to each SNMP and ICMP Echo request it sends to the managed object, before generating a timeout interrupt signal.
Retries (input line)
Specifies the number of times the SNMP and ICMP Echo request will be retransmitted after the first timeout occurs.
Monitors (frame) ICMP (checkbox)
If this checkbox is checked, the ICMP Echo (ping) polling is enabled.
Services (checkbox)
If this checkbox is checked, the monitoring of network services is enabled. If monitoring of network services is enabled in Net Inspector WorkGroup and better editions, each managed object is automatically scanned for the supported network services and detected services are automatically monitored. In the LITE Edition of Net Inspector, you need to manually configure which network services will be monitored on each managed object in the Services view of the device Properties window.
SNMP (checkbox)
If this checkbox is checked, the SNMP polling is enabled. The checkboxes below determine what information besides the basic system information will be monitored via SNMP (e.g., network interfaces, resources, processes, etc.):
Override ping OID (checkbox, input line and drop-down list)
48 be queried or use the SNMP Get operation instead, check the Override ping
OID checkbox and enter the desired OID into the OID input line and select the
SNMP operation (GetNext or Get) to be used for retrieving this OID from the
Operation drop-down list.
Network interfaces (checkbox and input lines)
If this checkbox is checked, the network interfaces on the managed object will be monitored via SNMP. In the accompanying Poll every input line enter the polling interval (in seconds) for monitoring network interface statistics. Furthermore, you can set the threshold values for triggering and clearing alarms associated with interfaces.
If Net Inspector Server is used for polling, the collected information will be displayed in the Interfaces view of the managed object’s Properties window (Figure 69). If Performance Manager polling engine is polling the device, the collected information will be displayed in the Interfaces frame in the Device Statistics window (Figure 73).
Interface status (checkbox)
If this checkbox is checked, Net Inspector monitors the status network interfaces on the given managed object and triggers alarm if any of the interfaces goes down without being administratively disabled. The alarm is automatically cleared when the interface comes up again.
In utilization (checkbox and two input lines)
If this checkbox is checked, you can enter the interface inbound utilization threshold values (in %) into the accompanying input lines. This way, Net Inspector will trigger an alarm when the interface inbound utilization rate exceeds the configured value for triggering the alarm (first input line) and clear the alarm when the same utilization rate falls below the clear alarm threshold value (second input line).
Out utilization (checkbox and two input lines)
If this checkbox is checked, you can enter the interface outbound utilization threshold values (in %) into the accompanying input lines. This way, Net Inspector will trigger an alarm when the interface outbound utilization rate exceeds the configured value for triggering the alarm (first input line) and clear the alarm when the same utilization rate falls below the clear alarm threshold value (second input line).
In error rate (checkbox and two input lines)
If this checkbox is checked, you can enter the interface inbound error rate threshold values (in %) into the accompanying input lines. This way, Net Inspector will trigger an alarm when the interface inbound error rate exceeds the configured value for triggering the alarm (first input line) and clear the alarm when the error rate falls below the clear alarm threshold value (second input line).
Out error rate (checkbox and two input lines)
49 clear the alarm when the error rate falls below the clear alarm threshold value (second input line).
Host Resources (checkbox and input line)
If this checkbox is checked, the utilization of device system resources, like the memory usage, CPU load, etc., will be monitored via SNMP (on Cisco devices and hosts supporting the HOST-RESOURCES-MIB module). In the accompanying
Poll every input line enter the polling interval (in seconds) for monitoring host
resources statistics. Furthermore, you can set the threshold values for triggering and clearing alarms associated with the system resource utilization.
If Net Inspector Server is used for polling, the collected information will be displayed in the Resources view of the managed object’s Properties window (Figure 70). If Performance Manager polling engine is polling the device, the collected information will be displayed in the Memory and Processor Info frame and in the in the Storage Info frame in the Device Statistics window (Figure 73).
Memory usage (checkbox and two input lines)
If this checkbox is checked, you can enter the device memory usage threshold values (in %) into the accompanying input lines. This way, Net Inspector will trigger an alarm when the device memory usage exceeds the configured value for raising the alarm (first input line) and clear the alarm when the memory usage falls below the clear alarm threshold value (second input line).
CPU load (checkbox and two input lines)
If this checkbox is checked, you can enter the device CPU load threshold values (in %) into the accompanying input lines. This way, Net Inspector will trigger an alarm when the device CPU load exceeds the configured value for raising the alarm (first input line) and clear the alarm when the CPU load falls below the clear alarm threshold value (second input line).
Storage usage (checkbox and two input lines)
If this checkbox is checked, you can enter the device data storage unit usage threshold values (in %) into the accompanying input lines. This way, Net Inspector will trigger an alarm when the device storage usage exceeds the configured value for raising the alarm (first input line) and clear the alarm when the storage usage falls below the clear alarm threshold value (second input line).
Processes (checkbox and input line)
Note: This option is available only if MG-SOFT Net Inspector WorkGroup and Enterprise Edition.
50 triggering and clearing alarms associated with the process status and resources consumption.
Collected information will be displayed in the Processes frame in the Device Statistics window (Figure 73).
Process status (checkbox)
If this checkbox is checked, Net Inspector monitors the status of processes on the given managed object and triggers an alarm if any of the processes stop running. The alarm is automatically cleared when the process is running again.
Process CPU (checkbox and two input lines)
If this checkbox is checked, you can enter the processes CPU load threshold values (in %) into the accompanying input lines. This way, Net Inspector will trigger an alarm when the processes CPU load exceeds the configured value for raising the alarm (first input line) and clear the alarm when the CPU load falls below the clear alarm threshold value (second input line)
Process memory
If this checkbox is checked, you can enter the processes memory usage threshold values (in MB) into the accompanying input lines. This way, Net Inspector will trigger an alarm when the processes memory usage exceeds the configured value for raising the alarm (first input line) and clear the alarm when the memory usage falls below the clear alarm threshold value (second input line).
IP SLA (checkbox and input line)
Note: This option is available only if MG-SOFT Net Inspector WorkGroup and Enterprise Edition.
If this checkbox is checked, the IP SLA statistics will be monitored on Cisco routers that are properly configured and provide this information via SNMP. Into the accompanying Poll every input line enter the polling interval (in seconds) for monitoring IP SLA statistics. Furthermore, you can set the threshold values for triggering and clearing alarms associated with the IP SLA metrics.
Collected information will be displayed in the IP SLA page in the Performance Statistics window .
For more information on configuring IP SLA operations on Cisco devices, please consult the Cisco documentation
RTT measurement status (checkbox)
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Echo round trip time (checkbox and two input lines)
If this checkbox is checked, the ICMP echo round trip time threshold is enabled.
Enter the echo round trip time threshold values (in ms) into the accompanying input lines. This way, Net Inspector will trigger an alarm when the echo round trip time exceeds the configured value for raising the alarm (first input line) and clear the alarm when the round trip time falls below the clear alarm threshold value (second input line).
Path echo round trip time (checkbox and two input lines)
If this checkbox is checked, the full path echo round trip time threshold is enabled.
Enter the full path echo round trip time threshold values (in ms) into the accompanying input lines. This way, Net Inspector will trigger an alarm when the full path echo round trip time exceeds the configured value for raising the alarm (first input line) and clear the alarm when the round trip time falls below the clear alarm threshold value (second input line).
TCP connect round trip time (checkbox and two input lines)
If this checkbox is checked, the IP SLA TCP connect round trip time threshold is enabled.
Enter the TCP connect round trip time threshold values (in ms) into the accompanying input lines. This way, Net Inspector will trigger an alarm when the TCP connect round trip time exceeds the configured value for raising the alarm (first input line) and clear the alarm when the round trip time falls below the clear alarm threshold value (second input line).
HTTP round trip time (checkbox and two input lines)
If this checkbox is checked, the IP SLA HTTP round trip time threshold is enabled.
Enter the HTTP round trip time threshold values (in ms) into the accompanying input lines. This way, Net Inspector will trigger an alarm when the HTTP round trip time exceeds the configured value for raising the alarm (first input line) and clear the alarm when the round trip time falls below the clear alarm threshold value (second input line).
DNS round trip time (checkbox and two input lines)
If this checkbox is checked, the IP SLA DNS round trip time threshold is enabled.
Enter the DNS round trip time threshold values (in ms) into the accompanying input lines. This way, Net Inspector will trigger an alarm when the DNS round trip time exceeds the configured value for raising the alarm (first input line) and clear the alarm when the round trip time falls below the clear alarm threshold value (second input line).
DLSW round trip time (checkbox and two input lines)
If this checkbox is checked, the IP SLA DLSW (Data Link Switching Plus) round trip time threshold is enabled.
