Method and System for Implementing Virtual Circuit Status Consistency

• US 20080205404A1
• Filed: 04/25/2008
• Published: 08/28/2008
• Est. Priority Date: 10/28/2005
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Zhou, Peng, Hu, Chunzhe, Wen, Yuangui
• Granted Patent: US 7,778,256 B2
• Time in Patent Office: Days
• US Class Current: 370/392
• 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 43/0811 by checking connectivity
• CPC Class Codes: H04L 45/02 Topology update or discovery
• CPC Class Codes: H04L 45/10 Routing in connection-oriented networks, e.g. X.25 or ATM

Abstract

A method and a system for implementing virtual circuit status consistency. A transmitting provider edge router (PE) send an extended network layer reachability information (NLRI) message to a remote PE; the remote PE updates the status of the virtual circuit from the remote PE to the transmitting PE, according to the received extended NLRI message, so as to make the status of the virtual circuits between the transmitting PE and the remote PE consistent. A system for implementing virtual circuit status consistency, the first provider edge router (PE1) in the system sending an extended network layer reachability information (NLRI) message to a second provider edge router (PE2); the PE2 updates the status of the virtual circuit from the PE2 to the PE1 according to the received extended NLRI message, so as to make the status of the bidirectional virtual circuits between the PE1 and the PE2 consistent.

Claims

1. A method for implementing virtual circuit status consistency, comprising:

receiving, by a second provider edge router, an extended network layer reachability information (NLRI) message from a first provider edge router;

determining, by the second provider edge router, a status of a virtual circuit from the first provider edge router to the second provider edge router, according to the received extended NLRI message; and

updating, by the second provider edge router, a status of a virtual circuit from the second provider edge router to the first provider edge router, so as to make the status of the virtual circuit from the second provider edge router to the first provider edge router consistent with that of the virtual circuit from the first provider edge router to the second provider edge router.

2. The method according to claim 1, further comprising:

determining, by the second provider edge router, the status of the virtual circuit from the first provider edge router to the second provider edge router, according to a value included in a circuit status vector (CSV) property, wherein the CSV property is included in the extended NLRI message, the value representing a status of a virtual circuit.

3. The method according to claim 2, further comprising:

acquiring, by the second provider edge router, a value of the CSV property in the extended NLRI message, when the first provider edge router sends the extended NLRI message comprising local information to the second provider edge router, determining the status of the virtual circuit from the first provider edge router to the second provider edge router, according to the value of the CSV property, and establishing a virtual circuit from the second provider edge router to the first provider edge router, the status of the virtual circuit from the second provider edge router to the first provider edge router being consistent with the status of the virtual circuit from the first provider edge router to the second provider edge router.

4. The method according to claim 2, further comprising:

acquiring, by the second provider edge router, an NLRI message comprising an amended CSV property, wherein the amended CSV property is the CSV property set as unavailable by the first provider edge router when the first provider edge router detects that the status of the virtual circuit to the second provider edge router is unavailable;

parsing, by the second provider edge router, the amended CSV property to acquire a value of the CSV property, and setting the status of the virtual circuit from the second provider edge router to the first provider edge router as unavailable when determining that the status of the virtual circuit from the first provider edge router to the second provider edge router is unavailable.

5. The method according to claim 1, wherein the virtual circuit is a virtual circuit in virtual private LAN service (VPLS) or virtual leased line (VLL).

14. A computer program product, characterized by comprising computer program codes which, when executed by a computer unit, will cause the computer unit to perform the method according to claim 1.

15. A computer program product, characterized by comprising computer program codes which, when executed by a computer unit, will cause the computer unit to perform the method according to claim 2.

16. A computer program product, characterized by comprising computer program codes which, when executed by a computer unit, will cause the computer unit to perform the method according to claim 3.

17. A computer program product, characterized by comprising computer program codes which, when executed by a computer unit, will cause the computer unit to perform the method according to claim 4.

18. A computer program product, characterized by comprising computer program codes which, when executed by a computer unit, will cause the computer unit to perform the method according to claim 5.

6. A system for implementing virtual circuit status consistency, comprising a first provider edge router and a second provider edge router, wherein,

the first provider edge router is adapted to send an extended network layer reachability information (NLRI) message;

the second provider edge router is adapted to determine a status of a virtual circuit from the first provider edge router to the second provider edge router according to the received extended NLRI message, and update a status of a virtual circuit from the second provider edge router to the first provider edge router, so as to make the status of the virtual circuit from the second provider edge router to the first provider edge router consistent with that from the first provider edge router to the second provider edge router.

7. The system according to claim 6, wherein the second provider edge router comprises:

a status determining module adapted to determine the status of the virtual circuit from the first provider edge router to the second provider edge router according to the received extended NLRI message;

a status updating module adapted to update the status of the virtual circuit from the second provider edge router to the first provider edge router.

8. The system according to claim 7, wherein the status determining module comprises:

a message parsing unit adapted to parse the extended NLRI message sent by the first provider edge router to acquire a value of a circuit status vector (CSV) property in the extended NLRI message.

9. The system according to claim 8, wherein the status updating module comprises:

a status setting unit adapted to set the status of virtual circuit from the second provider edge router to the first provider edge router according to the CSV property acquired by the message parsing unit.

10. The system according to claim 6, wherein the first provider edge router further comprises:

a detecting module adapted to detect the status of the virtual circuit from the first provider edge router to the second provider edge router.

11. A router, comprising:

a status determining module adapted to determine a status of a virtual circuit from another router to the present router according to an extended NLRI message received from the other router; and

a status updating module adapted to update a status of a virtual circuit from the present router to the other router, so as to make the status of the virtual circuit from the present router to the other router consistent with the status of the virtual circuit from the other router to the present router.

12. The router according to claim 11, wherein the status determining module comprises:

a message parsing unit adapted to parse the extended NLRI message sent by the other router to acquire a value of a circuit status vector (CSV) property in the extended NLRI message.

13. The router according to claim 12, wherein the status updating module comprises:

a status setting unit adapted to set the status of the virtual circuit from the present router to the other router according to the CSV property acquired by the message parsing unit.