This file is specifically supported for InfiniBand and NVOS fabrics. It is generated using the ibdiagnet tool with a specific command.
The following is example for topo file:
MQM8700 sw-ufm-hdr01
P2 -4x-50G-> HCA_mlx5_3 swx-ufm3-04 mlx5_0/P1
P3 -4x-50G-> HCA_mlx5_3 swx-ufm3-04 mlx5_1/P1
P40 -4x-50G-> MQM9700 sw-ufm-ndr05 P62
P5 -4x-50G-> HCA_mlx5_3 swx-ufm3-05 mlx5_2/P1
MQM9700 sw-ufm-ndr05
P61 -4x-50G-> MQM8700 sw-ufm-hdr01 P39
P62 -4x-50G-> MQM8700 sw-ufm-hdr01 P40
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