Known Issues

NVIDIA Quantum-2 Firmware Release Notes v31.2012.4036

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

Internal Ref



Description: Following a module reset, link up may take up to 70 seconds.

Workaround: N/A

Keywords: Module Rest, Link Up

Discovered in Version: 31.2012.4006


Description: When performing a partial split on an optical module, port may not link up.

Workaround: Conduct PAOS down and then PAOS up on the port.

Keywords: Optical Module, Partial Split

Discovered in Version: 31.2012.4006


Description: When using HDR speeds on NDR systems with NDR optic cables, the link does not raise.

Workaround: N/A

Keywords: HDR Speed, Optic Cables

Discovered in Version: 31.2012.1024


Description: Occasionally, on managed switch systems with FR4 coherent optical module, after running the "split- unsplit" flow or enabling L3 routing, the port may not raise a link.

Workaround: To get the link up on the FR4, perform SW reset to the switch

Keywords: FR4 coherent optical module

Discovered in Version: 31.2012.1024


Description: GMP MADs with GRH header towards the Router are not supported.

Workaround: N/A

Keywords: Routers

Discovered in Version: 31.2010.5042


Description: In some cases, MMS4X00-NL1.2 may have low BER.

Workaround: N/A

Keywords: Signal Integrity

Discovered in Version: 31.2010.2110


Description: Using NDR speed with Optical Transceivers causes bandwidth to be 350Gb/s instead of 400Gb/s in small packets.

Workaround: N/A

Keywords: Optical Transceivers

Discovered in Version: 31.2010.1310


Description: When using Optical Transceiver, toggling a port in a cage may toggle the adjacent port in the cage.

Workaround: N/A

Keywords: Optical Transceivers, Port Toggle

Discovered in Version: 31.2010.1310


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

Discovered in Version: 31.2010.1310


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

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

Keywords: VL Arbitration

Discovered in Version: 31.2010.1310


Description: Congestion profiles in VS-MAD PortProfileSetting support only fixed mode. Percentage mode is not supported.

Workaround: N/A

Keywords: InfiniBand Congestion Control

Discovered in Version: 31.2010.1310

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