PBB frame format

B-DA

Backbone destination MAC address

Destination B-MAC, outer destination MAC address in a PBB frame. It is the MAC address of the BEB at the destination end of the PBBN tunnel. The combination of B-DA and B-SA is B-MAC.

B-SA

Backbone source MAC address

Source B-MAC, outer source MAC address in a PBB frame. It is the MAC address of the BEB at the source end of the PBBN tunnel. The combination of B-DA and B-SA is B-MAC.

B-Tag

Backbone VLAN tag

B-VLAN tag, outer VLAN tag in a PBB frame. It indicates the VLAN information and priority information of the frame within the PBBN. The TPID in a B-Tag is 0x8100.

I-Tag

Backbone service instance tag

Service identifier of a PBB frame. The I-Tag contains the following fields:

• TPID—The TPID in an I-Tag is 0x88E7.

• I-PCP—Backbone service instance priority code point.

• I-DEI—Backbone service instance drop eligibility indicator.

• I-SID—Backbone service instance identifier.

• C-DA—Destination MAC address of the customer frame.

• C-SA—Source MAC address of the customer frame.

S-Tag

Service provider VLAN tag

Outer VLAN tag of the frame in the PBN, which indicates the VLAN and priority information of the frame within the PBN.

C-Tag

Customer VLAN tag

Inner VLAN tag of the frame in the PBN, which indicates the VLAN and priority information of the frame within the customer network.