End-to-end preservation of VLAN priority in connection-oriented networks

• US 7,292,577 B1
• Filed: 09/19/2001
• Issued: 11/06/2007
• Est. Priority Date: 09/19/2001
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Chinnaiah, Durai, Wang, Eugene, Jayakumar, Jayakumar, Ginipalli, Hariprasad
• Primary Examiner(s): Phan; Man U.
• Application Number:
  US09/957,311
• Time in Patent Office: 2,239 Days
• Field of Search: 370395-401, 370463-474, 370229-241, 370254-392, 709224-250, 455/450
• US Class Current: 370/395.1
• 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
• CPC Class Codes: H04L 45/306 Route determination based on the nature of the carried application

Abstract

Virtual local area network (VLAN) identifications (VIDs) used in a local area network (LAN) are identified. The LAN is connected to a connection-oriented wide area network (WAN). Each VLAN supports multiple priorities. For each VID, each of the priorities is mapped to a service type available in the WAN. Virtual connections (VCs) are set up based using a combination of the VID and the mapping of the priorities to the service types.

Claims

1. A method, comprising:

identifying priorities used in a source virtual local area network (VLAN);

identifying VLAN identifications (VIDs) used in the source VLAN;

mapping the priorities in the source VLAN to two or more service types available in a connection-oriented network to transmit VLAN traffic from the source VLAN to a destination VLAN; and

setting up a connection table having multiple virtual connections (VCs) to transmit the VLAN traffic, wherein the connection table is set up based on the VIDs used in the source VLAN and the mapping of the priorities used in the source VLAN such that each combination of the VIDs and the priorities is mapped to a different VC.

2. The method of claim 1, wherein mapping the priorities used in the source VLAN to the two or more service types comprises mapping a high priority to a more reliable service type.

3. The method of claim 1, further comprising:

when the VLAN traffic arrives at the destination VLAN, converting the VID used in the source VLAN to a VID used in the destination VLAN.

4. The method of claim 1, wherein the connection-oriented network is an asynchronous transfer mode (ATM) network.

5. A computer readable medium having stored thereon sequences of instructions which are executable by a system, and which, when executed by the system, cause the system to:

identify priorities used in a source virtual local area network (VLAN);

identify VLAN identifications (VIDs) used in the source VLAN;

map the priorities in the source VLAN to two or more service types available in a connection-oriented network to transmit VLAN traffic from the source VLAN to a destination VLAN; and

set up a connection table having multiple virtual connections (VCs) to transmit the VLAN traffic, wherein the connection table is set up based on the VIDs used in the source VLAN and the mapping of the priorities used in the source VLAN such that each combination of the VIDs and the priorities is mapped to a different VC.

6. The computer readable medium of claim 5, wherein the instructions to map the priorities used in the source VLAN to the two or more service types comprises instructions to map a high priority to a more reliable service type.

7. The computer readable medium of claim 5, further comprising instructions to:

when the VLAN traffic arrives at the destination VLAN, convert the VID used in the source VLAN to a VID used in the destination VLAN.

8. The computer readable medium of claim 5, wherein the connection-oriented network is an asynchronous transfer mode (ATM) network.

9. A system, comprising:

a bus;

a memory coupled to the bus;

a processor coupled to the memory and the bus, the processor is configured to execute instructions to;

identify priorities used in a source virtual local area network (VLAN);

identify VLAN identifications (VIDs) used in the source VLAN;

map the priorities in the source VLAN to two or more service types available in a connection-oriented network to transmit VLAN traffic from the source VLAN to a destination VLAN; and

set up a connection table having multiple virtual connections (VCs) to transmit the VLAN traffic, wherein the connection table is set up based on the VIDs used in the source VLAN and the mapping of the priorities used in the source VLAN such that each combination of the VIDs and the priorities is mapped to a different VC.

10. The system of claim 9, wherein the instructions to map the priorities used in the source VLAN to the two or more service types comprises instructions to map a high priority to a more reliable service type.

11. The system of claim 9, further comprising instructions to:

when the VLAN traffic arrives at the destination VLAN, convert the VID used in the source VLAN to a VID used in the destination VLAN.

12. A system, comprising:

means for mapping virtual local area network (VLAN) priorities in a source VLAN to service types available in a connection-oriented network; and

means for transmitting VLAN traffic from the source VLAN to a destination VLAN across the connection-oriented network using the mapping of the priorities, wherein each combination of the VIDs and the VLAN priorities is mapped to a different virtual connection (VC) such that a high priority is mapped to a more reliable service type.

13. The system of claim 12, further comprising means for setting up a connection table using the mapping of the VLAN priorities and VLAN identifications (VIDs), wherein each combination of the VIDs and the VLAN priorities is mapped to a different virtual connection (VC) in the connection table.

14. An apparatus, comprising:

a bus;

a processor coupled to the bus;

a memory coupled to the processor and the bus, the memory comprising a connection table having two or more virtual connections (VCs) to transmit virtual local area network (VLAN) traffic from a VLAN across a connection-oriented network, the VLAN associated with a VLAN identification and having multiple frame priorities, wherein each combination of the VID and one of the multiple frame priorities is mapped to a different VC and the VLAN traffic is transmitted across the connection-oriented network such that a VLAN frame having a higher priority is transmitted over a more reliable VC than a VLAN frame having a lower priority.

16. The apparatus of claim 14, wherein each of the multiple frame priorities is mapped to one of multiple service types available in the connection-oriented network such that a higher priority is mapped to a more reliable service type.

15. An apparatus, comprising:

means for setting up a connection table having two or more virtual connections (VCs) to transmit virtual local area network (VLAN) traffic from a VLAN across a connection-oriented network, the VLAN associated with a VLAN identification (VID) and having multiple frame priorities; and

means for mapping each of the multiple frame priorities to one of multiple service types available in the connection-oriented network such that each combination of the VID and the priorities is mapped to a different VC.