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802.1 ah (PBB) Header
Backbone Destination Address (B-DMAC)
Backbone Source Address (B-SMAC)
.1ad Ethertype
.1ah Ethertype
.1ad B-TAG TCI/VID
.1ah I-TAG TCI/SID
Destination Address (C-DMAC)
Source Address (C-SMAC)
Encap Ethertype
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PPT Version