Discovery | Empty Model Field on SNMP OID Classification 1.3.6.1.4.1.11.2.3.9.1 for HP Printers<!-- /*NS Branding Styles*/ --> .ns-kb-css-body-editor-container { p { font-size: 12pt; font-family: Lato; color: var(--now-color--text-primary, #000000); } span { font-size: 12pt; font-family: Lato; color: var(--now-color--text-primary, #000000); } h2 { font-size: 24pt; font-family: Lato; color: var(--now-color--text-primary, black); } h3 { font-size: 18pt; font-family: Lato; color: var(--now-color--text-primary, black); } h4 { font-size: 14pt; font-family: Lato; color: var(--now-color--text-primary, black); } a { font-size: 12pt; font-family: Lato; color: var(--now-color--link-primary, #00718F); } a:hover { font-size: 12pt; color: var(--now-color--link-primary, #024F69); } a:target { font-size: 12pt; color: var(--now-color--link-primary, #032D42); } a:visited { font-size: 12pt; color: var(--now-color--link-primary, #00718f); } ul { font-size: 12pt; font-family: Lato; } li { font-size: 12pt; font-family: Lato; } img { display: ; max-width: ; width: ; height: ; } } Issue Multiple HP Printer models return the same SNMP sysObjectID (1.3.6.1.4.1.11.2.3.9.1) during Discovery, raising questions about how Discovery distinguishes between different HP Printer models to populate the correct model name in the CMDB. Symptoms Multiple HP Printers in the environment share the sysObjectID 1.3.6.1.4.1.11.2.3.9.1.Despite sharing the same sysObjectID, each printer CI in the CMDB displays its correct, specific model name. Facts The OID 1.3.6.1.4.1.11.2.3.9.1 is a common enterprise-level sysObjectID used broadly across many HP Printer product lines.SNMP-based Discovery relies on sysObjectID values for initial device classification, but additional probes and sensors can refine identification beyond the sysObjectID alone.ServiceNow Discovery handles HP Printer model identification out of the box without requiring customization. Cause HP assigns the same sysObjectID (1.3.6.1.4.1.11.2.3.9.1) to a wide range of printer models. The sysObjectID alone is insufficient to determine the specific model. However, Discovery includes built-in logic to resolve the correct model name through a multi-step classification and probing process. Resolution ServiceNow Discovery identifies HP Printer models in all base systems through the following process: Step 1: SNMP OID Classification Discovery queries the device's sysObjectID and matches 1.3.6.1.4.1.11.2.3.9.1 to the Standard Network Printer classification. Navigate to Discovery Definition > CI Classification > SNMP System OIDs and search for OID 1.3.6.1.4.1.11.2.3.9.1 to view this SNMP OID Classification record.Navigate to Discovery Definition > CI Classification > SNMP and search for Standard Network Printer to view this SNMP Classification record. Step 2: Conditional Probe Trigger The Standard Network Printer classification includes a condition that evaluates the device's sysDescr value. If the sysDescr contains "HP", Discovery automatically triggers the SNMP - HP Printer Model probe. Navigate to Discovery Definition > Probes and search for SNMP - HP Printer Model to view the probe configuration. Step 3: OID Query for Model Information The SNMP - HP Printer Model probe queries the device for the following OIDs: hrDeviceType — Identifies the type of hardware device.hrDeviceDescr — Returns a text description that includes the specific printer model name. Step 4: Sensor Parsing The SNMP - HP Printer Model sensor receives the probe response and parses the model name from the hrDeviceDescr value. The parsed model name is then written to the corresponding printer CI record in the CMDB. Navigate to Discovery Definition > Sensors and search for SNMP - HP Printer Model to view the sensor and its parsing logic. Verification To confirm this process is working correctly for a specific printer: Run a targeted Discovery against a known HP Printer in the environment.Open the Discovery Status record and review the ECC Queue entries to verify the SNMP - HP Printer Model probe was triggered and returned data.Open the resulting CI record in the CMDB and confirm the Model field displays the correct, specific model name. If Discovery is unable to get the Model from the SNMP - HP Printer Model probe then below warning is written to the Discovery Logs. "Unable to find model ID information", 'SNMP - HP Printer Model' If the ECC Queue input for the SNMP - HP Printer Model probe did not return data for hrDeviceDescr and hrDeviceType, then you'll need to verify on the device that it's configured to respond to these OIDs. Please contact HP Support for any device configuration issues.If the ECC Queue input for the SNMP - HP Printer Model probe did return data in response to hrDeviceDescr and hrDeviceType, the model name is present in those returns, and the 'SNMP - HP Printer Model' sensor did not parse it, then please open a case with ServiceNow Support to investigate. Additional Resources ServiceNow Documentation: SNMP ClassificationServiceNow Documentation: Discovery Sensors and ProbesServiceNow CommunityServiceNow Support