Specify the traffic direction to which this map applies. Upstream: Customer C-Tag, Pbit, Ethertype, DSCP, and IP Protocol are used to classify traffic upstream. The Upstream Pbit Mode specifies how PBits are mapped or remapped from Customer traffic to Network traffic. The frames headed toward the network should be tagged with the network S-Tag and C-Tag. Downstream: Network S-Tag, C-Tag, PBit, Ethertype, DSCP, and IP Protocol are used to classify traffic. The Downstream Pbit Mode specifies how PBits are mapped or remapped from Network traffic to Customer traffic. The frames egressing the Interface should be tagged with the customer C-Tag. Bi-Directional: This map applies in both directions and follows both the downstream and upstream descriptions.