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|Sun Datacenter InfiniBand Switch 36 HTML Document Collection for Firmware Version 2.0|
You can use the ibdiagnet command to determine which links are at 1x bandwidth, 2.5 Gbps, or 5 Gbps data rate.
# ibdiagnet -lw 4x -ls 10 -pc -pm -skip all
In this instance of the ibdiagnet command, there is a check for all links to be at 4x QDR (-lw 4x -ls 10), and if not, to report those links that are not 4x QDR.
Switch Reference, ibdiagnet command