Method and apparatus for processing labeled flows in a communication access network
A system and method is provided for managing access communications between the service edge of a communications service provider and a customer. Access communications are carried in the form of carrier-tagged flows, the communications traffic being appended with carrier tags having significance to handling of the traffic through access network elements. A building aggregation system is provided which couples to customer premise equipment and interfaces customer flows to carrier-tagged flows used in the access network.
1. A computer-implemented method comprising:
receiving, at a layer 2 switch, a first carrier-tagged traffic flow from a service edge via a first label switched path, wherein the first carrier-tagged traffic flow has a first carrier tag;
identifying, at the layer 2 switch, a second label switched path based on a flow identifier included with the first carrier tag of the first carrier-tagged traffic flow, where the flow identifier comprises a pseudo-wire tag or a virtual local area network (VLAN) tag;
removing the flow identifier, by the layer 2 switch, from the first carrier tag of the first carrier-tagged traffic flow; and
switching the first carrier-tagged traffic flow after assigning a new carrier tag without the flow identifier to a first building aggregation system, for aggregating a plurality of different services, from the layer 2 switch via the second label switched path, wherein the first label switched path and the second label switched path are multiprotocol label switching (MPLS) label switched paths.
2. The method of claim 1 , wherein the flow identifier comprises a VLAN tag in accordance with 802.1q.
3. The method of claim 1 , wherein the flow identifier comprises a pseudo-wire tag.
4. The method of claim 1 , wherein the flow identifier further comprises a tunnel label.
5. The method of claim 1 , wherein the flow identifier includes multiple flow identifiers that are stacked.
6. The method of claim 1 , further comprising:
receiving, at the layer 2 switch, a second carrier-tagged traffic flow from the service edge via the first label switched path;
identifying, at the layer 2 switch, a third label switched path based on a second flow identifier included with the second carrier-tagged traffic flow;
removing the second flow identifier from the second carrier-tagged traffic flow; and
switching the second carrier-tagged traffic flow to a second building aggregation system from the layer 2 switch via the third label switched path.
7. A computer-implemented method comprising:
receiving a first carrier-tagged traffic flow on a first label switched path between a service edge and a building aggregation system that aggregates a plurality of different services, wherein the first carrier-tagged traffic flow has a first carrier tag;
determining a first flow identifier associated with the first carrier tag of the first carrier-tagged traffic flow, where the first flow identifier comprises a pseudo-wire tag or a virtual local area network (VLAN) tag;
identifying a second label switched path between a layer 2 switch and one of the service edge or the building aggregation system based on the first flow identifier; and
transmitting the first carrier-tagged traffic flow on the second label switched path with the first flow identifier, wherein the first label switched path and the second label switched path are multiprotocol label switching (MPLS) label switched paths.
8. The method of claim 7 , further comprising:
receiving a second carrier-tagged traffic flow with a second flow identifier on the second label switched path between a layer 2 switch and one of the service edge or the building aggregation system;
identifying the first label switched path based on the second flow identifier; and
transmitting the second carrier-tagged traffic flow on the first label switched path without the second flow identifier.