Missing Serial Numbers for 1000Base-T (Copper) SFPs on Cisco Nexus 7000 (N7K)

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1

Description:
I am experiencing an issue where LibreNMS fails to discover/display Serial Numbers for 1000Base-T (Copper) transceivers on Cisco Nexus 7000 platforms, while Fiber transceivers (10Gbase-SR, 1000base-SX) are discovered correctly.

Key Findings:

  • CLI Verification: Running show interface transceiver on the Nexus CLI shows the Serial Numbers for these Copper SFPs correctly.

  • SNMP Walk: When performing an SNMP walk/get on ENTITY-MIB::entPhysicalSerialNum (1.3.6.1.2.1.47.1.1.1.1.11), the indexes corresponding to 1000Base-T interfaces are missing or skipped entirely by the NX-OS SNMP Agent.

  • Affected OID: The entPhysicalName (1.3.6.1.2.1.47.1.1.1.1.7) also skips these specific interfaces, suggesting they are not registered in the standard Entity-MIB table on this platform.

Request:
Is there a way for LibreNMS to retrieve this data via an alternative OID or a custom polling method (perhaps via SSH/CLI scraping as a fallback) for Cisco Nexus devices when the standard Entity-MIB does not provide the information?

Thanks you,

2

Currently, it is only feasible to fetch via SNMP.
If you find an alternative SNMP OID, something could be done.

It may be helpful to file a bug report with the vendor (or perhaps even a fix exists already and you only need to update the firmware).

3

Thanks for your response.

Yes, My N7K software is out of date.

I will try to find a supported software version.