Configuring the Device to Add Double VLAN Tags to Untagged Packets
You can configure one device to add double VLAN tags to untagged packets.
Context
Generally, two devices are required to add double tags to packets. Configuring one device to add double VLAN tags to untagged packets can simplify configuration. In addition, a Layer 2 interface can add double tags to untagged packets to differentiate services or users.
Procedure
- Run:
system-viewThe system view is displayed.
- Run:
vlan vlan-id
The outer VLAN is created.
- Run:
quitReturn to the system view.
- Run:
interface interface-type interface-number
The interface view is displayed.
- Run:
port link-type hybrid
The link type of the interface is set to hybrid.
By default, the LNP negotiation mode of an interface is negotiation-desirable.
- Run:
port hybrid untagged vlan vlan-id
The interface is added to the outer VLAN.
- Run:
port vlan-stacking untagged stack-vlan vlan-id1 stack-inner-vlan vlan-id2
The interface is configured to add double VLAN tags to untagged packets.
To enable an interface to add double VLAN tags to an untagged packet, you must set the link type of the interface to hybrid or trunk, and add the interface to the outer VLAN specified by stack-vlan.
If the PVID of an interface is not VLAN 1, restore the PVID to VLAN 1 before running the port vlan-stacking untagged command.
The port vlan-stacking untagged command actually configures interface-based VLAN assignment. Different VLAN assignment modes are in the following order of priority: policy-based VLAN assignment > voice VLAN include-untagged > MAC address-based VLAN assignment > IP subnet-based VLAN assignment > protocol-based VLAN assignment > interface-based VLAN assignment.
