NVIDIA Quantum Firmware v27.2000.2708 Release Notes
NVIDIA Quantum Firmware v27.2000.2708 Release Notes

Known Issues

The following sections describe known issues in this firmware release and possible workarounds.

Internal Ref.

Issue

2036930

Description: Degradation in throughput might be experienced when using HDR100 cables with a length of 30m and above.

Workaround: N/A

Keywords: Cables, Bandwidth

Discovered in Version: 27.2000.2708

1996051

Description: After performing a software reset on the switch while using an Active Copper Cable or Optics Cable, the link gets high BER and is not available for traffic forwarding.

Workaround: Toggle the Active Copper or Optics cables as the switch performs a reset.

Keywords: Cables, BER

Discovered in Version: 27.2000.2708

1972573

Description: Reading the Serial Number by the MSPS register is not functional on the new Delta PSU model.

Workaround: N/A

Keywords: Delta PSU model, MSPS register

Discovered in Version: 27.2000.2708

1856717

Description: High BER may occur when connecting cables of type 0.5/1m DAC to an HDR speed.

Workaround: N/A

Keywords: Cables

Discovered in Version: 27.2000.1886

1563590

Description: LR4 modules are currently not supported.

Workaround: N/A

Keywords: Modules/Cables

Discovered in Version: 27.2000.1012

-

Description: The supported length of HDR copper cables is currently up to 2M.

Workaround: N/A

Keywords: HDR cables

Description: Although the effective BER (after FEC) is expected to meet our design targets (e.g. 10e-14 or lower), occasionally it may be higher.

Workaround: N/A

Keywords: Cables

1796936

Description: HDR optical cables and Split cables support only HDR speed.

Workaround: N/A

Keywords: Link Speed, cables, Break-Out cables

-

Description: The following features are currently not supported on Mellanox Quantum™ based systems:

  • IB Router

  • Congestion Control

  • Voltage reading via MVCR

Workaround: N/A

Keywords: Mellanox Quantum

1970878

Description: When using Mellanox AOC cables longer than 50m use one VL to achieve full wire speed.

Workaround: N/A

Keywords: Cables

955641

Description: VL_HIGH_LIMIT is not affecting the VL arbiter as expected.

Workaround: Arbitration table should be set using only the low priority VL arbitration table.

Keywords: VL Arbitration

1249608

Description: Configuring weight "0" for VL, results in unexpected behavior.

Workaround: Arbitration table should be configured with weights other than "0".

Keywords: VL Arbitration

-

Description: Module info page in Diagnostics Data VS-MAD is not supported

Workaround: N/A

Keywords: Diagnostics Data VS-MAD

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