●Troubleshooting

During device discoveries, HP Web Jetadmin uses SNMP queries to gather information from the device. If HP Web Jetadmin concludes that the device is a peripheral such as a printer, plotter, or multifunction device, it displays the device in the list of discovered devices. For HP Web Jetadmin to conclude that a device is a peripheral, the device must be able to answer a set of industry-standard questions.

A Management Information Base (MIB) is a set of objects that defines the types of SNMP queries that can be asked of a device. For example, the Standard Printer MIB (RFC 1759) is a generic set of objects to which most peripherals should be able to provide answers when queried. The Standard Printer MIB consists of objects that describe functionality and capabilities of the printer such as page counts and media types. Other common MIBs include MIB2 (RFC 1213) and the Host Resources MIB (RFC 1514). Device vendors also have a set of proprietary MIBs that contain information unique to their devices. HP Web Jetadmin must have knowledge of MIB objects in device plug-ins before it can send queries to devices using those MIB objects.

Devices must be able to answer queries defined in the common industry-standard MIBs for HP Web Jetadmin to discover the devices. Otherwise, there is not enough information about the device to warrant displaying it in the list of discovered devices. HP Web Jetadmin focuses on printer management, and it would be increasingly difficult to distinguish devices as printers unless they can answer a standard set of questions such as those defined in the Standard Printer MIB.

After HP Web Jetadmin discovers a device, the level of support that can be provided depends on the depth of queries defined in the respective device plug-ins.

Support

Support in HP Web Jetadmin can be quite extensive if the device can answer industry-standard queries. Quite a bit of HP Web Jetadmin functionality can be supported through standard queries such as basic status, configuration, alerts, reporting, and page counting. HP Web Jetadmin attempts to support the following functionality for third-party devices using standard queries for basic support.

Device Page — Status Tab●Device and Information categories

◦Picture of a generic device, possibly vendor specific

◦Device Model, IP Hostname, IP Address, System Contact

●Status category

◦Basic status (online/offline, toner low, toner out, media low, media out, paper jam, cover open, service requested)

◦Front panel display

●Supply levels category

◦Input tray remaining levels

◦Supplies remaining levels

Device Page — Config tab

●Device category

◦Contact Person◦Control Panel Language

142 Chapter 3 Device Management

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