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Hello, we use the port isolation feature to reduce broadcast domains on a site between sectors,

It can be useful to have protected port groups,


For example you have sectors on on ports 9-20 you want to isolate them from each other so you would put them in isolation group1

and then you may have a number of uplinks from 21-23, but you dont want to create a loop / broadcast storm / between ports 21-23 you would put them in isolation group2

so any port 9-20 can communicate with any port 21-23 and vice versa,

but ports 9-20 are isolated from each other
and ports 21-23 are isolated from each other

This rationale is used in many switches as protected port groups
switchport mode protected group 1

switchport mode protected group 2

or in software bridges as a bridge port horizon value... (ports with the same horizon value are isolated from each other )