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1-3). VLAN Stacking
VLAN Stacking function allows two VLAN tags in a packet for 802.1Q VLAN
tunnelling application through a central network.
For VLAN Stacking operation, port role definition is needed for each port. There
are three roles for a port - Normal, Tunnel, and Access.
Normal - It will set the port(s) as normal 802.1Q VLAN port(s). And the
tagged/untagged setting will follow the settings in 802.1Q VLAN.
Access - It will set the port(s) as access port(s) for VLAN stacking operation. It
will strip a tag from tagged or double-tagged packets before forwarding. It is for
downward connection of VLAN stacking operation.
Tunnel - It will set the port as tunnel port for VLAN stacking operation. It will add
a tag and allow two 802.1Q VLAN tags in a packet. It is for tunnel and upward
connection of VLAN stacking operation.
SPVID is used as the Port VLAN ID of VLAN Stacking (L2 Tunnel) operation if the
port role is “access”.
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