ANCP-triggered dynamic VLANs

You can configure the instantiation of autosensed dynamic VLANs for Layer 2 wholesale services, triggered by out-of-band ANCP messages rather than by in-band control packets. These VLANs accommodate both subscribers wholesaled to a retailer and subscribers belonging to the wholesaler. An ANCP Port Up message triggers VLAN instantiation and conveys several ANCP DSL attributes. During VLAN authorization, RADIUS determines which traffic belongs to the access provider's own subscribers and which belongs to the wholesale customer (retail ISP) based on identification of the subscriber's access line by the agent remote identifier. The outer VLAN ID provided by the access node is swapped for an inner VLAN ID to convey wholesaled traffic to the retailer's unique, nondefault routing instance. The wholesaler uses Layer 2 cross-connects to implement the retail networks with 1:1 autosensed, dynamic VLANs and VLAN tag swapping. Core-facing physical interfaces are dedicated to forwarding subscriber connections to the retailer's router. The traffic for an entire outer VLAN can be wholesaled this way. This direct-connect model supports any combination of wholesaler-owned and wholesaled connections for the entire access-facing VLAN range.