Configuring a downlink port

On the BEB, frames from the customer network are mapped to a PBB VSI based on match criteria configured on downlink ports. PBB frames from the PBBN are decapsulated in the corresponding PBB VSI. They are forwarded out of the corresponding downlink ports based on their customer MAC addresses.

You can specify one or multiple downlink ports for a PBB VSI.

Do not assign downlink ports to any B-VLANs.

To configure a downlink port:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Enter Layer 2 Ethernet interface view.	interface interface-type interface-number	N/A
3. Create an Ethernet service instance and enter Ethernet service instance view.	service-instance instance-id	By default, no Ethernet service instances exist on a port. Do not execute this command on an EVB-enabled interface. For information about EVB, see EVB Configuration Guide.
4. Configure a frame match criterion.	Match frames that do not match any other service instance on the interface: encapsulation default Match any 802.1Q tagged or untagged frames: encapsulation { tagged \| untagged } Match frames tagged with the specified outer 802.1Q VLAN ID:encapsulation s-vid vlan-id [ only-tagged ] Match frames tagged with the specified outer 802.1Q VLAN IDs:encapsulation s-vid vlan-id-list	Use one of the commands to configure a frame match criterion. By default, no frame match criterion is configured.
5. Associate the Ethernet service instance with the specified PBB VSI.	xconnect vsi vsi-name [ access-mode { ethernet \| vlan } ]	By default, an Ethernet service instance is not associated with any PBB VSI.

For more information about the service-instance, encapsulation, and xconnect vsi commands, see MPLS Command Reference.

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