The MAC address that identifies a subarea boundary node as the source or destination of frames carried over the portion of a BAN connection between an SNA peripheral node on a LAN and a boundary access node (BAN). The BAN DLCI MAC address appears as the source MAC address in frames sent from the BAN to the peripheral node and as the destination MAC address in frames sent from the peripheral node to the BAN. The portion of the BAN connection between the BAN and the boundary node uses the boundary node identifier (BNI) rather than the BAN DLCI MAC address.