HP 5820X series Configuration Manual page 63

[Device-GigabitEthernet1/0/3] port-isolate enable
# Display information about the isolation group.
<Device> display port-isolate group
Port-isolate group information:
Uplink port support: NO
Group ID: 1
Group members:
GigabitEthernet1/0/1 GigabitEthernet1/0/2
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GigabitEthernet1/0/3