Spectrum device model is missing the Serial Number

Products

• Spectrum
• Network Observability

Issue/Introduction

When the device is modeled as GnSNMPDev serial number is populated but the Manufacturer field is empty.

When the device is modeled as Rtr_Cisco the serial number is empty.

Cisco ASR devices missing Serial Number in Spectrum

Environment

All supported DX NetOps Spectrum releases

Cause

The device doesn't provide the MIB OIDs and values that provide the serial number value.

Resolution

The Attribute deviceSerialAttr (attribute ID 0x3d0063) relies on Attribute chassisid (attribute ID 0x210b5d; OID 1.3.6.1.4.1.9.3.6.3.0) for the serial number value from Cisco devices.

Non-Cisco devices using GnSNMPDev Spectrum reads the value of the entPhysicalClass OID (1.3.6.1.2.1.47.1.1.1.1.5) value from the Entity MIB on the device. If it finds a value of chassis(3) Spectrum reads the corresponding instance value of the entPhysicalSerialNum OID (1.3.6.1.2.1.47.1.1.1.1.11) value. If populated it populates the Serial_Number attribute (attribute id 0x10030) with the value.

 

1. Fix the devices so they provide the expected MIB OIDs and their values.
2. For Cisco devices that have no chassisid OID value, if it has entPhysicalClass and entPhysicalSerialNum values this can help.
   1. Change the DeviceSerialAttr attribute value to 0x0. Save the change.
   2. Run "Reconfigure Model" against the device.
   3. Spectrum will try and obtain the Serial number from the ENTITY-MIB OIDs if populated.

Additional Information

Not sure what values are seen for a devices MIB OIDs?

• Use the MIB Tools UI to query the OIDs and see if they return for specific devices.
  • If the OIDs don't return they are missing from or not supported by the device.
  • If they do return but with no value, the value will need to be returned for the Serial Number to be shown.