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Configuring VLANs 689
Configuring Double VLAN Tagging
Beginning in Privileged EXEC mode, use the following commands to
configure an interface to send and accept frames with double VLAN tagging.
DVLAN uplink interfaces must be configured for tagging (trunk mode) for
double tags to be observed on frames egressing the interface. DVLAN uplink
interfaces should be configured to accept tagged frames for the DVLAN or
outer VLAN. Ensure that the native VLAN on the uplink port is set to the
DVLAN ID. MAC address learning on DVLAN enabled ports occurs on the
DVLAN uplink port's native VLAN.
Enabling DVLAN tunneling configures all ports in the system as access ports
except those configured as uplink ports. Access ports must be configured with
the uplink ports native VLAN as their PVID.
Command Purpose
configure Enter global configuration mode.
vlan 100 Configure the DVLAN (outer) VLAN.
exit Exit VLAN configuration mode
interface
interface
Enter interface configuration mode for the specified
interface. The
interface
variable includes the interface type
and number, for example tengigabitethernet 1/0/3.
You can also specify a range of interfaces with the interface
range command, for example, interface range
tengigabitethernet 1/0/8-12 configures interfaces 8, 9, 10,
11, and 12.
switchport mode trunk Configure the interface as tagging.
switchport trunk native
vlan 100
Configure MAC learning on the DVLAN VLAN
mode dvlan-tunnel Enable Double VLAN Tunneling on the uplink (service
provider) interface.
exit Exit to global configuration mode