The per port sampling rate overrides the system-wide value.
The rate is rounded off to the next power of two, so if 400 is specified, the sample rate is configured as 512. The valid range is 1 to 536870912.
This configuration applies to Summit Family Switches, BlackDiamond 8000, c-, e-, xl-, and xm-Series Modules, and BlackDiamond X8 Series Switches only. All ports on the switch or the same I/O module are sampled individually.