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Catalyst 6500 Series Switch Command Reference—Release 8.4
OL-6244-01
Chapter 2 Catalyst 6500 Series Switch and ROM Monitor Commands
set port dot1q-ethertype
set port dot1q-ethertype
To set the EtherType field in the IEEE 802.1Q tag to a custom value, use the set port dot1q-ethertype
command.
set port dot1q-ethertype mod/port {value | default}
Syntax Description
Defaults The EtherType field is set to default.
Command Types Switch command.
Command Modes Privileged.
Usage Guidelines If you specify a custom EtherType field, your network can support Cisco and non-Cisco switches that
do not use the standard 0x8100 EtherType to identify 802.1Q-tagged frames. When you specify a custom
EtherType field, you can identify 802.1Q tagged frames and switch the frames to a specified VLAN. The
two bytes immediately following the EtherType are interpreted as a standard 802.1Q tag. Specify the
value of the two-byte EtherType field as a hexadecimal number.
To return the custom EtherType field to the default value (0x8100), use the set port dot1q-ethertype
mod/port default command.
Note A custom 802.1Q EtherType field is supported on the following modules only: Supervisor Engine 2 and
Supervisor Engine 720 uplink ports, WS-X6516-GBIC, WS-X6516A-GBIC, WS-X6516-GE-TX,
WS-X6148-GE-TX, WS-X6148V-GE-TX, WS-X6548-GE-TX, WS-X6548V-GE-TX, WS-X6748-GE-TX,
WS-X6724-SFP, WS-X6704-10GE, WS-X6501-10GEX4, and WS-X6502-10GE.
Note EtherChannels do not support a custom 802.1Q EtherType field. If you configure a port with a custom 802.1Q
EtherType field, the port cannot join a channel. If a channel is already configured, you cannot change the
802.1Q EtherType on any of the channel ports.
Note On the WS-X6516A-GBIC, WS-X6516-GBIC, and WS-X6548-GE-TX modules, if you configure a port with
a custom 802.1Q EtherType in the port groups 1 through 8 or 9 through 16, all ports in the group are
configured with the custom 802.1Q EtherType. On the WS-X6516-GE-TX module, if you configure a port
with a custom 802.1Q EtherType in the port groups 1 through 4, 5 through 8, 9 through 12, or 13 through 16,
all ports in the group are configured with the custom 802.1Q EtherType.
mod/port Number of the module and the port on the module.
value Hexadecimal number of the two-byte EtherType field.
default Specifies the default value of 0x8100 for the two-byte EtherType field.