HP Web Jetadmin Software Uživatelský manuál stáhnout pdf (Strana 9)

PART 2—DISCOVERY METHODS

Now that we have looked at discovery features and workflows, we can return to the issue of

individual methods of discovery. The variety of methods available provides the flexibility to tailor

discoveries for specific environments. Some administrators need to find all devices in an enterprise

and may find that IP range discovery, when correctly configured, results in successful and efficient

device discoveries. Other administrators may only need to discover local devices. These

administrators might find that IP broadcast in combination with SLP multicast work best. In all cases,

HP Web Jetadmin discoveries require SNMP communication between the devices and the

application. Most modern networks allow this protocol, which makes HP Web Jetadmin a robust

platform for performing device discoveries.

Quick Device Discovery

Quick Device Discovery is comparable to Quick Device

Find in earlier versions of HP Web Jetadmin (Figure 11).

Characteristics of Quick Device Discovery include:

 Discovers only one device at a time based on user-

supplied IP hostnames or IP address

 Does not discover PC-connected devices

 Is not launched from the Device Discovery wizard

This feature is always visible in the Device Management view just beneath the navigation tree. Simply

enter either an IP hostname or IP address string and click Go. Quick Device Discovery only acts on

address information. The feature searches device addresses in the HP Web Jetadmin database before

performing a network query. If a device is found at the address provided, it is added to the All

Devices list. This feature is different from Search and Advanced Search (found in the device list toolbar)

which parse all or selected strings within device lists.

SLP (Service Location Protocol) multicast discovery

SLP multicast discovery requires minimal settings to launch and multicasts a query onto the network to

find a specific device type. Characteristics of an SLP multicast discovery are:

 Only HP Jetdirect-connected devices are discovered

 Multicast packets are sent to the HP Jetdirect specific multicast address: 224.0.1.60

 Packets contain a router hop-counter (IP time-to-live attribute) that is configurable from within

HP Web Jetadmin (default 4 hops)

 Packets expire when the router hop-counter reaches zero

 Fast discovery mechanism

 Low impact on network traffic

The SLP multicast discovery was implemented in early HP Web Jetadmin releases and is effective in

finding HP Jetdirect devices on both local and remote subnets. It has a small footprint on the network.

IP broadcast discovery

IP broadcast discovery enables administrators to find devices when IP broadcast addresses are

known. Characteristics of IP broadcast discoveries are:

 Works on both PC-connected and network devices

 Sends SNMP queries over one or more IP broadcasts

 Devices that reply are placed into the Nodes found group and await node resolution

Figure 11—Quick Device Discovery

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