C
HAPTER
36
| VLAN Commands
Configuring IEEE 802.1Q Tunneling
– 848 –
DEFAULT SETTING
Disabled
COMMAND MODE
Interface Configuration (Ethernet, Port Channel)
COMMAND USAGE
â—† QinQ tunneling must be enabled on the switch using the dot1q-tunnel
system-tunnel-control command before the switchport dot1q-tunnel
mode interface command can take effect.
â—† When a tunnel uplink port receives a packet from a customer, the
customer tag (regardless of whether there are one or more tag layers)
is retained in the inner tag, and the service provider’s tag added to the
outer tag.
â—† When a tunnel uplink port receives a packet from the service provider,
the outer service provider’s tag is stripped off, and the packet passed
on to 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 (849)
show interfaces switchport (781)
switchport dot1q-
tunnel tpid
This command sets the Tag Protocol Identifier (TPID) value of a tunnel
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)
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