System and method for indicating classification of a communications flow

• US 8,289,973 B2
• Filed: 06/03/2004
• Issued: 10/16/2012
• Est. Priority Date: 04/05/2004
• Status: Active Grant

• Current Assignee: Verizon Patent and Licensing Incorporated (Verizon Communications Inc.)
• Original Assignee: Verizon Business Global LLC (Verizon Communications Inc.)
• Inventors: DelRegno, Nick, Kotrla, Scott R., McDysan, David E., Bencheck, Michael U., Turlington, Matthew W., Hardin, Ross S., Schell, Richard C., Chiu, Howard, Bengston, Lee D., Drake, William
• Primary Examiner(s): Sheikh, Ayaz
• Assistant Examiner(s): Moutaouakil, Mounir
• Application Number:
  US10/860,803
• Publication Number:
  US 20050220107A1
• Time in Patent Office: 3,057 Days
• Field of Search: 370/395.5, 370/395.51, 370/395.52, 370/395.64, 370/395.65, 370/428, 370/466, 370/467, 709/249
• US Class Current: 370/395.42
• CPC Class Codes: H04L 12/4633 Interconnection of networks using encapsulation techniques, e.g. tunneling
• CPC Class Codes: H04L 45/50 using label swapping, e.g. multi-protocol label switch [MPLS]
• CPC Class Codes: H04L 45/66 Layer 2 routing, e.g. in Ethernet based MAN's
• CPC Class Codes: H04L 47/10 Flow control; Congestion control

Abstract

System and method for providing a layer 2 switch in the access network that switches based upon one or more carrier tags identifying customer traffic. Customer traffic conforming to any variety of different layer 1 or layer 2 protocols may be encapsulated and identified according to carrier tag values. The layer 2 switch may determine how to handle the traffic by interpreting and manipulating the carrier tag values. The layer 2 switch may be capable of switching TDM input traffic to either TDM or packet output traffic, and switching packetized input traffic to either TDM or packet output traffic. Handling classification values may also be processed by the layer 2 switch to affect prioritization of handling of encapsulated traffic.

Claims

1. In a communication system having a plurality of network elements and a service edge, a method of processing communications comprising:

receiving, at one of the plurality of network elements, a communication comprising a first carrier tag having a first handling classification field and a first handling classification value included in the first handling classification field;

determining per-hop behavior based on the first handling classification value;

determining whether the one of a plurality of network elements is a penultimate network element before the service edge;

responsive to a determination that the one of a plurality of network elements is the penultimate network element, forwarding the communication to the service edge;

responsive to a determination that the one of a plurality of network elements is not the penultimate network element, determining whether the per-hop behavior resulted in a second carrier tag comprising a second handling classification field being added to the communication;

responsive to a determination that a second carrier tag has not been added, processing the communication in accordance with the first handling classification value to forward the communication to a next network element; and

responsive to a determination that a second carrier tag has been added, populating the second handling classification field and setting a second handling classification value based on the first handling classification value prior to forwarding

the communication comprising the second handling classification field to the next network element.

2. The method of claim 1 further comprising:

removing the first carrier tag from the communication.

3. The method of claim 1 wherein the setting the value of the second handling classification field comprises copying the value of the first handling classification field into the second handling classification field.