Dell N1100-ON Reference Manual page 818

Command Mode
Interface mode (physical and port channel), Interface range mode (physical
and port channel)
User Guidelines
This command configures a customer edge (CE) port for QinQ tunneling.
The dot1q-tunnel mode is an overlay on switchport access mode. In
particular, configuring the access mode PVID sets the outer dot1q-tunnel
VLAN ID. Changing the switchport mode to access, general, or trunk,
effectively disables tunneling on the interface.
Customer edge ports can be physical ports or port channels. Untagged frames
received on the CE interface will be processed as if they belong to the PVID
and will be transmitted out the SP interface with a single VLAN tag. Tagged
frames received on the CE interface will be transmitted out the service
provider (SP) interface with an outer tag containing the native VLAN ID and
the inner tag as received on the CE interface.
CE interfaces must be configured in dot1q-tunnel mode with the PVID
configured with the outer tag (native) VLAN ID for the associated service
provider (SP) interface. Configure the outer VLAN ID using the switchport
access vlan command. All MAC address learning and forwarding occurs on
the outer VLAN tag. The VLAN ID must be common to both the SP port and
the CE ports.
The service provider interface must be configured for egress tagging (trunk or
general mode) with a native VLAN identical to the PVID of the associated
CE ports. SP interfaces should be configured with a single VLAN ID. A trunk
mode port will accept untagged packets on the native VLAN and be a
member of any newly created VLANs by default. In general mode, it is
possible to directly configure the port to only accept tagged packets with a
single VLAN ID.
It is not possible to configure an inner VLAN TPID value. The inner VLAN
TPID value is always Ethernet (0x8100).
Multiple groups of associated CE and SP ports can be defined by configuring
the groups with unique VLAN IDs.
The port mirroring logic stage occurs after the after the tag processing stage
on ingress and before the tag processing stage on egress. When mirroring
packets associated with SP or CE ports, the outer VLAN tag may or may not
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Layer 2 Switching Commands