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Basic Vlan dot1q tunnel Function
The port on which Vlan dot1q tunnel function is enabled, adds a layer of VLAN Tag to the
packet when receiving a packet. The VLAN ID to which the Tag is added is the default
VLAN ID of the port. If the received packet is a Tag packet, the packet is changed into a
packet with two layers of tags. if the received packet doesn’t have a Tag, the packet is a
packet with a single layer of tag.
Flexible Vlan dot1q tunnel Function
The flexible Vlan dot1q tunnel function is a flexible realization of the Vlan dot1q tunnel
function by cooperating with the port VLAN. A port adds a specified external VLAN tag to
a packet according to the items of the flexible Vlan dot1q tunnel (mapping) table and the
VLAN ID in the packet Tag. Vlan dot1q tunnel mapping replaces the VLAN ID in the packet
Tag with the specified VLAN ID.
If a port doesn’t match the items in the flexible Vlan dot1q tunnel (mapping) table, then
encapsulates the external VLAN Tag for the packet; the VLAN Tag is the port PVID VLAN.
Flexible Vlan dot1q tunnel Function
The flexible Vlan dot1q tunnel function is a flexible realization of the Vlan dot1q tunnel
function by cooperating with the port VLAN. A port adds a specified external VLAN tag to
a packet according to the items of the flexible Vlan dot1q tunnel (mapping) table and the
VLAN ID in the packet Tag. Vlan dot1q tunnel mapping replaces the VLAN ID in the packet
Tag with the specified VLAN ID. If a port doesn’t match the items in the flexible Vlan
dot1q tunnel (mapping) table, then the packet is discarded. This function can be realized
through configuration, please refer to the configuration command
vlan dot1q-tunnel
drop.
TPID of Flexible Vlan dot1q tunnel
TPID (Tag Protocol Identifier)
,
is a field of the Tag in a packet. It means the
corresponding protocol type of the VLAN Tag. The value range of a VLAN Tag file is
0x8100. By default, the value range of the external VLAN Tag in the Vlan dot1q tunnel
packet is 0x8100. Different manufactures may set different values for the external VLAN
Tag in the Vlan dot1q tunnel packet, such as 0x9100.
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