General Related Troubleshooting

Link down

The link might be down due to one of the following issues:

• cable issues,

• unsupported speeds,

• configuration issues

Run mlx5cmd -dbg -pddrinfo and check the following lines in the output presented:

• Troubleshooting Info:

  • Messages: Indicates the issue that requires attention.

• Operational Info:

  • Active link speed: The active speed displayed in bit mask. The list of bits are stated below.

  • Supported speeds: The supported speed displayed in bit mask. The list of bits are stated below.

Ethernet:

• 100GB: Bits 23-20

• 56GB: Bit 8

• 50GB: Bits 31-30; 19-18

• 40GB: Bits 16-15; 7

• 25GB: Bits 29-28

• 20GB: Bit 5

• 10GB: Bits 14-12; 4-2

• 1G: Bit 1

InfiniBand:

• Bit 0: SDR

• Bit 1: DDR

• Bit 2: QDR

• Bit 4: FDR