HP OpenView System Administration Handbook [Electronic resources] : Network Node Manager, Customer Views, Service Information Portal, HP OpenView Operations نسخه متنی

4.1 NNM DISCOVERY

Network discovery begins immediately after you install NNM. During discovery, NNM examines its own ARP (Address Resolution Protocol) cache and pings every device in it. The ARP cache is a list of the IP to MAC address translations of all devices a system has communicated with during the past 15 minutes. The ARP cache can be displayed as shown in Figure 4-1 by typing by typing the command

arp a .

After pinging a device, NNM sends a series of

snmpget s to acquire more information about the discovered devices. One of the most important MIB variables that NNM retrieves is the system object id, also known as the OID. The OID uniquely identifies the vendor and model of the device. The OID is used by NNM as an index into a variety of its configuration files, one of which is

oid_to_type . NNM sets the device type based on entries in the

oid_to_type file. The

oid_to_type file contains a list of well-known vendor devices. This list is a text file that ships with hundreds of predefined OIDs. HP OIDs are listed separately in the

HPoid2type file. Both of these files indicate to NNM the device type that has been discovered.Chapter 5, "Network Discovery."

Start the native NNM (ovw) interface and take a look at what it does out of the box. Start NNM by typing

Unix:

ovw&

Windows:

StartProgramsHP OpenViewNetwork Node Manager

4.1.1 ovw: Maps and Submaps

The ovw interface uses the concept of a "map" to show you the network it has discovered. Because only the most trivial network could be represented on a one-page map, the ovw interface splits the map into multiple pages. The pages are known as submaps and have a simple hierarchical relationship. At the top of this hierarchy is the

root submap, as shown in Figure 4-2a. There are only four other levels in this hierarchy. The submap levels include the root, Internet, network, segment, and node levels as shown in Figure 4-2a.

There are four additional levels in this hierarchy. The submap levels include the root, Internet, network, segment, and node levels as shown in Figure 4-2b.

4.1.2 The Menu Bar

NNM has around 100 cascaded menu bar items, most of which will be covered in this book. Some of the most frequently used items can also be accessed through the toolbar. The menu bar can be customized by the use of

Application Registration Files (ARFs), which are discussed in Chapter 7, "Advanced Customization."

4.1.3 The Toolbar Icons

The toolbar icons shown in Chapter 5. The

Root Submap icon takes you to the root submap. The

Parent Submap icon navigates up one level. Note that it is greyed out on the root submap because there are no more levels above root. The

Quick Navigator icon displays a "standalone" (non-hierarchial) submap that can be customized for access to frequently accessed submaps. By default, the Quick Navigator is empty. Adding submaps and objects to the Quick Navigator is discussed in Chapter 5. The

Pan and Zoom icon displays the panner/view port that allows you to zoom in on a submap. This is particurlarly helpful when you have a submap with many symbols. Finally,

About OpenView provides version information on NNM.

To display the version of NNM, click the About OpenView icon from the toolbar. This displays the "About HP OpenView" dialog box as shown in Figure 4-4.

You can find integrated applications by clicking the

[Applications…] button. License information may be obtained by clicking the

[More Info…] button. See Figure 4-5 for the license type and node limit.

4.1.4 Pan and Zoom

Look at the network submap shown in Figure 4-6. Due to the number of symbols on a submap, sometimes you cannot see the internal symbol bitmaps and it may be difficult to read the symbol labels. By selecting the

Pan and Zoom toolbar icon, you can get a close-up view of the submap.

After clicking the icon, the panner/viewport is displayed on your screen as shown in Figure 4-7. To use this viewport, press and hold down the left mouse button, while dragging the mouse to draw a box in the panner/viewport around the symbols you want to zoom in on. Figure 4-8 shows the "zoomed in" effect of the panner/viewport. You can use the middle mouse button (both buttons together on a 2 button mouse) to drag the box, giving a panner effect to your submap view. If you keep the zoomed-in view, use the

[Close] button on the panner/viewport. Click

[All] to display the original view.

4.1.5 Map Navigation

To navigate through the GUI, double-click the symbols in the main viewing area to drill down to the next level in the map hierarchy and use the up arrow on the toolbar to access the parent submap. The symbols displayed with bitmaps are devices that have responded to SNMP, and NNM has successfully received configuration information about these devices. The symbols displayed without bitmaps have responded to ping but possibly not to SNMP, as shown in Figure 4-9.

4.1.5.1 Non-SNMP Devices

On occasion, you may encounter symbols with empty bitmaps such as the ones in Chapter 5 for a description of environment variables available in NNM.