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Ethernet switch cannot build the separate MAC address table for
different VLANs, there will be a conflict of MAC address table. To solve
this problem, the switch controller utilizes the VLAN Uplink port to
emulate the usage of Independent VLAN MAC Address Table.
VLAN Uplink Setting:
If VLAN uplink function is enabled and the
destination port of an unicast packet is located at the next VLAN, this
packet will be forwarded to the uplink port. Choose the Uplink Port X
for the port ID. The Uplink X will be the uplink port of its VLAN.
Note:
There is a functional conflict between VLAN striding and VLAN
uplink. Imagine what will happen if both VLAN striding and VLAN
uplink are enabled simultaneously? In this case, the switch selects
VLAN striding and ignores the VLAN uplink setting.