First Available Path
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The switch selects the path with the lowest path number that is available.
When an item looks through the switch to determine a path to take, the switch first determines which paths are available to be taken. The switch then selects the path with the lowest path number.
If you think it is possible that ALL paths could be blocked when an item looks through the switch, you will need to select the Gating option “Switch can Block Items”, to avoid a run-time error.
Read more about Gating Options.