摘要 |
A method and Bridge in a Provider Backbone Bridge Network, PBBN, for enabling frames from a Higher Layer Entity (11a, 11b, 22) attached alternatively to a Provider Instance Port, PIP, (14) on an I-Component (13) of a Backbone Edge Bridge or to a Customer Backbone Port on a B-Component of the Backbone Edge Bridge, to reach an intended entity in the PBBN. A Virtual Instance Port Service Access Point, VIP SAP, (10) is configured for every VIP and every Higher Layer Entity configured on the I-Component. An Enhanced VIP Port Connectivity function (12) utilizes the VIP SAP (10) to tunnel customer- initiated Layer 2 Control Protocols, L2CPs. A Special Multiplexed SAP (21) handles the frames of the Higher Layer Entity, and is assigned an I-SID value that is universally recognized to identify the L2CPs. A Service Instance Multiplex Entity (24) utilizes the Special Multiplexed SAP (10) to transfer frames between the PIP (14) or the Customer Backbone Port and the entity inside the PBBN. |