Configuring the data encapsulation type

A PBB VSI supports Ethernet and VLAN data encapsulation types.

Data encapsulation type decides how the BEB handles the P-tag on a PBB VSI, as shown in Table 19. P-tags are unique VLAN tags that the service provider assigns to users for differentiation.

Table 19: P-tag manipulation

Traffic direction	Ethernet encapsulation	VLAN encapsulation
CE to PBBN	The traffic must not contain a P-tag. VLAN access mode—The BEB removes the P-tag before it encapsulates the traffic in PBB. Ethernet access mode—The BEB directly encapsulates the traffic in PBB. The VLAN tag in the received traffic is considered a U-tag.	The traffic must contain a P-tag. VLAN access mode—The BEB retains the P-tag or changes the P-tag to the value assigned by the peer BEB. Ethernet access mode—The BEB adds the P-tag assigned by the peer BEB. The original VLAN tag in the received traffic is considered a U-tag. The P-tag assigned by the peer BEB might be a null tag (tag 0).
PBBN to CE	VLAN access mode—The BEB adds a P-tag before it forwards the traffic. Ethernet access mode—The BEB forwards the traffic without adding a P-tag. The BEB cannot modify or remove any tags already in the traffic from PBBN to CE.	VLAN access mode—The BEB forwards the traffic with the P-tag modified or intact. Ethernet access mode—The BEB removes the P-tag before it forwards the traffic.

Traffic direction

Ethernet encapsulation

VLAN encapsulation

CE to PBBN

The traffic must not contain a P-tag.

VLAN access mode—The BEB removes the P-tag before it encapsulates the traffic in PBB.
Ethernet access mode—The BEB directly encapsulates the traffic in PBB. The VLAN tag in the received traffic is considered a U-tag.

The traffic must contain a P-tag.

VLAN access mode—The BEB retains the P-tag or changes the P-tag to the value assigned by the peer BEB.
Ethernet access mode—The BEB adds the P-tag assigned by the peer BEB. The original VLAN tag in the received traffic is considered a U-tag.

The P-tag assigned by the peer BEB might be a null tag (tag 0).

PBBN to CE

VLAN access mode—The BEB adds a P-tag before it forwards the traffic.
Ethernet access mode—The BEB forwards the traffic without adding a P-tag.

The BEB cannot modify or remove any tags already in the traffic from PBBN to CE.

VLAN access mode—The BEB forwards the traffic with the P-tag modified or intact.
Ethernet access mode—The BEB removes the P-tag before it forwards the traffic.

NOTE:

To configure the access mode, use the xconnect vsi command (see MPLS Command Reference).

To configure the data encapsulation type for a PBB VSI:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Enter VSI view.	vsi vsi-name	N/A
3. Enter PBB VSI view.	pbb i-sid i-sid	N/A
4. Specify an encapsulation type for the PBB VSI.	encapsulation { ethernet \| vlan }	By default, VLAN encapsulation applies.

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