PLANET SGSD-1022 - Manual (Page 583)

User’s Manual of SGSD-1022 / SGSD-1022P
SGSW-2840 / SGSW-2840P
more tag layers) is retained in the inner tag, and the service provider’s tag added to the outer tag.
• plink port receives a packet from the service provider, the outer service provider’s tag is stripped off, and the packet
passed onto the VLAN indicated by the inner tag. If no inner tag is found, the packet is passed onto the native VLAN
defined for the uplink port.
Example
Console(config)#interface ethernet 1/1
Console(config-if)#switchport dot1q-tunnel mode access
Console(config-if)#
Related Commands
show dot1q-tunnel
show interfaces switchport
switchport dot1q-tunnel tpid
This command sets the Tag Protocol Identifier (TPID) value of a tunnel uplink port. Use the no form to restore the Default
Setting .
Syntax
switchport dot1q-tunnel tpid tpid no switchport dot1q-tunnel tpid
tpid – Sets the ethertype value for 802.1Q encapsulation. This identifier is used to select a nonstandard 2-byte ethertype
to identify 802.1Q tagged frames. The standard ethertype value is 0x8100. (Range: 0800-FFFF hexadecimal)
Default Setting
0x8100
Command Mode
Interface Configuration (Ethernet, Port Channel)
Command Usage
• Use the switchport dot1q-tunnel tpid command to set a custom 802.1Q ethertype value on the selected interface.
This feature allows the switch to interoperate with third-party switches that do not use the standard 0x8100 ethertype to
identify 802.1Q-tagged frames. For example, if 0x1234 is set as the custom 802.1Q ethertype on a tunnel port,
incoming frames containing that ethertype are assigned to the VLAN contained in the tag following the ethertype field,
as they would be with a standard 802.1Q trunk. Frames arriving on the port containing any other ethertype are looked
upon as untagged frames, and assigned to the native VLAN of that port.
• All port members of a VLAN should be set to the same ethertype.
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