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What does the header look like? C-SA = Customer Source MAC address C-DA = Customer Destination MAC address VID = VLAN ID C-VID = Customer VID (12 bits) S-VID = Service VID (12 bits) I-SID = Service ID (24 bits) B-VID = Backbone VID (12 bits) B-DA = Backbone DA B-SA = Backbone SA C-DA C-SA Payload B-DA B-SA B-VID I-SID 802.1 802.1Q C-DA C-SA Payload C-VID Ethertype Ethertype C-DA C-SA Payload S-VID C-VID Ethertype Ethertype Ethertype S-VID C-VID Ethertype Ethertype Ethertype Ethertype Ethertype Customer frames 802.1ad 802.1ah Provider Bridge (PB) frame format Provider Backbone Bridge (PBB) frame format Same format and Ethertype as an S-Tag S-Tag C-Tag Mac-in-Mac Header |