The MAS interface is using the following numbering convention. Each MAS port has three separate numbers:
For example, the interface gigabitethernet 0/0/20 denotes the slot number zero (0), module 0 and port number 20. In the case of Stacking, the first number denotes the member identification.
Aruba Mobility Access Switch S1500-24P-US, Version 126.96.36.199
 Aruba MAS 7.3.0 User Guide
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