230
describes key fields in the frame.
Table 14
PBB frame fields
Field Full
name
Description
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.
For more information about TPID, see "
."
