Ethernet to frame relay interworking with multiple quality of service levels

• US 7,565,436 B2
• Filed: 12/24/2003
• Issued: 07/21/2009
• Est. Priority Date: 12/24/2003
• Status: Active Grant

• Current Assignee: Ericsson AB (Telefonaktiebolaget LM Ericsson)
• Original Assignee: Nortel Networks Limited (Nortel Networks Corporation)
• Inventors: Pommainville, Richard, Davies, John Rosser, Whatman, John, Rabie, Sameh, Abdullah, Bashar, Barka, Baghdad
• Primary Examiner(s): Flynn; Nathan J
• Assistant Examiner(s): WASEL, MOHAMED A
• Application Number:
  US10/744,000
• Publication Number:
  US 20050144327A1
• Time in Patent Office: 2,036 Days
• Field of Search: 709227-229
• US Class Current: 709/229
• CPC Class Codes: H04L 12/4641 Virtual LANs, VLANs, e.g. virtual private networks [VPN] LAN interconnection over a bridge based backbone H04L12/462; encapsulation techniques H04L12/4633; routing of packets H04L45/00; packet switches H04L49/00; virtual private networks for security H04L63/0272

Abstract

A method of supporting multiple quality of service (QoS) levels for data being transmitted between two networking devices, such as customer equipment (CE), that use Ethernet and Frame Relay (FR). The method supports multiple QoS services in a network where a first CE is connected to a first edge device (interworking unit) using the Ethernet protocol and a second CE is connected to a second edge device using the FR protocol. The edge devices may be directly connected together or they may be connected through a network backbone using any generally accepted network protocol. The first CE may be connected to the first edge device using a single Ethernet port, multiple Ethernet ports, a single virtual local area network (VLAN), or multiple VLAN'"'"'s. The second CE is connected to an edge device using a single data link connection (DLC), or multiple DLC'"'"'s. The method ensures QoS for data transmitted between the first and the second CE via the Ethernet protocol to the FR protocol and vice versa.

Claims

1. A method of implementing Quality of Service (QoS) across Frame Relay and Ethernet networks to enable similar QoS to be provided to packets in both the Frame Relay and Ethernet networks as the packets pass from one network to the other, the method comprising the steps of:

receiving a packet from the Ethernet network;

identifying the packet according to an Ethernet protocol for servicing;

determining an Ethernet QoS metric for the identified packet, the QoS metric being associated with the packet on the Ethernet network, said determining an Ethernet QoS metric includes considering Ethernet information, wherein said Ethernet information includes p-bits information; and

based upon the determined Ethernet QoS metric, determining a corresponding Frame Relay QoS metric; and

servicing the identified packet for transmission on the Frame Relay network in accordance with the determined corresponding Frame Relay QoS metric protocol to thereby enable similar QoS to be provided to the packet in the Frame Relay network as was provided to the packet in the Ethernet network, wherein said servicing the identified racket further includes assigning a drop precedence to the packet based on the p-bits information.

2. The method of claim 1, wherein the Ethernet information includes Ethernet port information.

3. The method of claim 1, wherein the Ethernet information includes virtual local area network identifier (VLAN ID) information.

4. The method of claim 3, wherein the Ethernet information further includes VLAN ID information.

5. The method of claim 1, wherein the step of determining a QoS metric includes considering Upper Layer Protocol (ULP) information.

6. The method of claim 5, wherein the ULP information includes Internet Protocol (IP) packet information.

7. The method of claim 6, wherein the IP packet information includes Differentiated Services Code Point (DSCP) bit information.

8. The method of claim 7, wherein the IP packet information further includes VLAN ID information.

9. The method of claim 7, wherein the step of servicing further includes assigning a drop precedence to the packet based on the DSCP bit information.

10. The method of claim 1, wherein the step of servicing includes mapping the packet to a Frame Relay Data Link Connections (DLC) and scheduling the packet for transmission according to a sub-connection scheduling scheme.

11. The method of claim 1, wherein the step of servicing includes mapping the packet to one of a plurality of Frame Relay Data Link Connections (DLCs) and scheduling the packet for transmission according to a connection scheduling scheme.

12. A method of implementing Quality of Service (QoS) across Frame Relay and Ethernet networks to enable similar QoS to be provided to packets in both the Frame Relay and Ethernet networks as the packets pass from one network to the other, the method comprising the steps of:

receiving a packet from the Frame Relay network;

identifying the packet according to a Frame Relay protocol for servicing;

determining a Frame Relay QoS metric for the identified packet, the QoS metric being associated with handling of the packet on the Frame Relay network by considering FR information; and

based upon the determined Frame Relay QoS metric, determining a corresponding Ethernet QoS metric; and

servicing the identified packet for transmission in accordance with an Ethernet protocol to thereby enable similar QoS to be provided to the packet in the Ethernet network as was provided to the packet in the Frame Relay network, wherein said servicing the identified racket further includes assigning a drop precedence to the packet based on discard eligible (DE) bit information.

13. The method of claim 12, wherein the Frame Relay information includes data link connection information.

14. The method of claim 12, wherein the step of servicing includes mapping the packet to an Ethernet port and scheduling the packet for transmission according to a class scheduling scheme.

15. The method of claim 12, wherein the step of servicing includes mapping the packet to one of a plurality of Ethernet ports and scheduling the packet for transmission according to a basic scheduling scheme.

16. A system for implementing Quality of Service (QoS) across Frame Relay and Ethernet networks to enable similar QoS to be provided to packets in both the Frame Relay and Ethernet networks as the packets pass from one network to the other comprising:

an input; and

control circuitry associated with the input and adapted to;

receive a packet from the Ethernet network;

identify a the packet according to an Ethernet protocol for servicing;

determine an Ethernet QoS metric for the identified packet, the QoS metric being associated with the packet on the Ethernet network, said determining an Ethernet QoS metric includes considering Ethernet information, wherein said Ethernet information includes p-bits information; and

based upon the determined Ethernet QoS metric, determining a corresponding Frame Relay QoS metric; and

service the identified packet for transmission on the Frame Relay network in accordance with the determined corresponding Frame Relay QoS metric protocol to thereby enable similar QoS to be provided to the packet in the Frame Relay network as was provided to the packet in the Ethernet network, wherein said servicing the identified racket further includes assigning a drop precedence to the packet based on the p-bits information.

17. The system of claim 16, wherein the Ethernet information further includes Ethernet port number information.

18. The system of claim 17, wherein the Ethernet information further includes VLAN ID information.

19. The system of claim 16, wherein the control circuitry is further adapted to consider Upper Layer Protocol (ULP) information to determine a QoS metric.

20. The system of claim 19, wherein the ULP information includes Internet Protocol (IP) information.

21. The system of claim 20, wherein the IP information includes Diff-Serv Differentiated Services Code Point (DSCP) bit information.

22. The system of claim 21, wherein IP information further includes virtual local network identifier (VLAN ID) information.

23. The system of claim 22, wherein the control circuitry is further adapted to assign a drop precedence to the packet based on the DSCP bit information.

24. The system of claim 16, wherein the control circuitry is further adapted to map the packet to a Frame Relay Data Link Connections (DLC) and schedule the packet for transmission according to a sub-connection scheduling scheme to service the packet.

25. The system of claim 16, wherein the control circuitry is further adapted to map the packet to one of a plurality of Frame Relay Data Link Connections (DLCs) and schedule the packet for transmission according to a connection scheduling scheme to service the packet.

26. The system of claim 16, wherein the system is located at an edge of a core network.

27. The system of claim 16, wherein the system is located in a user element.

28. A system of implementing Quality of Service (QoS) across Frame Relay and Ethernet networks to enable similar QoS to be provided to packets in both the Frame Relay and Ethernet networks as the packets pass from one network to the other comprising:

an input; and

control circuitry associated with the input and adapted to;

receiving a packet from the Frame Relay network;

identify the packet according to a Frame Relay protocol for servicing;

consider Frame Relay information to determine a Frame Relay QoS metric for the identified packet, the QoS metric being associated with handling of the packet on the Frame Relay network; and

based upon the determined Frame Relay QoS metric, determining a corresponding Ethernet QoS metric; and

service the identified packet for transmission in accordance with an Ethernet protocol to thereby enable similar QoS to be provided to the packet in the Ethernet network as was provided to the packet in the Frame Relay network, wherein said servicing the identified racket further includes assigning a drop precedence to the packet based on discard eligible (DE) bit information.

29. The system of claim 28, wherein Frame Relay information includes data link connection information.

30. The system of claim 28, wherein the control circuitry is further adapted to map the packet to an Ethernet port and schedule the packet for transmission according to a class scheduling scheme to service the packet.

31. The system of claim 28, wherein the control circuitry is further adapted to map the packet to one of a plurality of Ethernet ports and schedule the packet for transmission according to a basic scheduling scheme to service the packet.