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switchport dot1q-ethertype
This command sets the Tag Protocol Identifier (TPID) value of a tunnel
port. Use the no form. Use the no form to restore the default setting.
Syntax
switchport dot1q-ethertype tpid
no switchport dot1q-ethertype
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: 0-ffff hexadecimal)
Default Setting
No dot1q-ethertype is set.
Command Mode
Interface Configuration (Ethernet, Port Channel)
Command Usage
• Use the switchport dot1q-ethertype 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, 0x1234 is set as the custom 802.1Q ethertype on a trunk
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 members of a VLAN should be set to the same ethertype.
Example
Console(config)#interface ethernet 1/1
Console(config-if)#switchport dot1q-ethertype 9100
Console(config-if)#
Related Commands
show interfaces switchport (24-16)
C
IEEE 802.1Q T
ONFIGURING
UNNELING
30-27
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