HP 3100 Series Configuration Manual page 56

Configure Device to provide Internet access for all the hosts and isolate them from one another.
Figure 12 Networking diagram
Configuration procedure
# Add ports Ethernet 1/0/1, Ethernet 1/0/2, and Ethernet 1/0/3 to the isolation group.
<Device> system-view
[Device] interface ethernet 1/0/1
[Device-Ethernet1/0/1] port-isolate enable
[Device-Ethernet1/0/1] quit
[Device] interface ethernet 1/0/2
[Device-Ethernet1/0/2] port-isolate enable
[Device-Ethernet1/0/2] quit
[Device] interface ethernet 1/0/3
[Device-Ethernet1/0/3] 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:
Ethernet 1/0/1 Ethernet 1/0/2
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Ethernet 1/0/3