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802.1Q VLAN Mode
1. This mode supports 16 VLAN groups, Group 0 ~ Group 15.
2. When an untagged packet is received, the associated PVID setting
of the input port is used to map to one VLAN group in VLAN group
table. The mapping index is retrieved from the least 4 bits (bit 3~0) of
the PVID value.
3. When a tagged packet is received, the VLAN ID value of the
received packet is used to map to one VLAN group in VLAN group
table. The mapping index is retrieved from the least 4 bits (bit 3~0) of
the VLAN ID value.
4. Packet forwarding is performed only among the member ports in
same group. If the input port of the received packet is not the
member port of the mapped group, the packet will be dropped.
5. For outbound, Tag mode of the output port is applied as follows:
Received untagged packet output to:
Tag port : The packet is inserted with PVID of the input port
as VLAN ID and new CRC.
Untag port : The packet is forwarded with no change.
Received tagged packet output to:
Tag port : The packet is forwarded with no change.
Untag port : The VID of the packet is removed and forwarded
with new CRC.
Note:
When VLAN mode is set from 802.1Q mode to Port-based mode, all ports
are set to Untag ports automatically.