ZyXEL Communications GS1920 - 6.2 Layer 2 isolation

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6.2 Layer 2 isolation
Overview
This feature is to Block traffic communication between ports in the same VLAN,
but it can communicate with the uplink port to access the internet.
Topology,
Note: Block all traffics within the same VLAN, but it can communicate with uplink
port (port 24)
.