Alloy Computer Products 16-PORT GIGABIT WEB SMART SWITCH GSS-16T2SFP - Manual (Page 27)

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Up-link Port:
This feature is only enabled when the metro mode is selected.
Option 15:
All ports are assigned a unique VLAN with Port 15.
Port 15 ends up a member of 15 VLAN groups, one VLAN for each port.
This secures intra port traffic, but allows all ports access to a single
uplink port(15). Each VLAN has 2 members. 15 VLANS in total.
Option 16:
All ports are assigned a unique VLAN with Port 16.
Port 16 ends up a member of 15 VLAN groups, one VLAN for each port.
This secures intra port traffic, but allows all ports access to a single
uplink port (16). Each VLAN has 2 members. 15 VLANS in total.
Option 15&16:
All ports are assigned a unique VLAN with Port 15 and 16.
Both ports 15 and 16 end up members of 14 VLAN groups, one VLAN
for each port. This secures intra port traffic, but allows all ports access
to both uplink ports (15 and 16). Each VLAN has 2 members. 14
VLANS in total.
Fig. 4-6