METHOD AND DEVICE FOR PATH SWITCHOVER

• US 20110007652A1
• Filed: 09/10/2010
• Published: 01/13/2011
• Est. Priority Date: 05/09/2008
• 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: BAI, Lianwei
• Granted Patent: US 8,416,747 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04L 45/02 Topology update or discovery
• CPC Class Codes: H04L 45/026 Details of "hello" or keep-alive messages
• CPC Class Codes: H04L 45/22 Alternate routing
• CPC Class Codes: H04L 45/308 Route determination based on user's profile, e.g. premium users
• CPC Class Codes: H04L 47/70 Admission control; Resource allocation
• CPC Class Codes: H04L 47/728 for backup paths
• CPC Class Codes: H04L 47/745 Reaction in network

Abstract

A method and device for path switchover in communications field are provided. The method includes: detecting communication quality of traffic transmitted on an active path and obtaining a detection value of the communication quality; determining whether the detection value meets a switching condition; if yes, switching the traffic transmitted on the active path to a standby path. The device includes a detecting module, an obtaining module, a determining module and a switching module. The embodiment of the present disclosure integrates the NQA technology for detecting the path communication quality and the TE FRR fast path switching technology, and the NQA detection result may trigger the TE FRR path to switch quickly. Therefore, when the signal quality of the path degrades, making the QoS requirement of the SLA hard to meet, the traffic may be switched to standby path to meet the requirement of the SLA agreed originally between the carrier and the user, so as to improve the user experience and the satisfactory degree on the service provided by the carriers.

Claims

1. A method for path switchover, comprising:

detecting communication quality of traffic transmitted on an active path and obtaining a detection value of the communication quality;

determining whether the detection value meets a switching condition; and

switching the traffic transmitted on the active path to a standby path, if the switching condition is met.

2. The method of claim 1, wherein the detecting the communication quality of traffic transmitted on the active path comprises:

detecting the communication quality of traffic transmitted on the active path through Network Quality Analysis (NQA) technology.

3. The method of claim 1, wherein the determining whether the detection value meets a switching condition comprises:

determining whether the detection value is smaller than a preset reference value;

if the detection value is smaller, the switching condition is met;

if the detection value is not smaller, the switching condition is not met.

4. The method of claim 1, wherein

the active path is an IP forwarding path;

the active path is an Label Switch Path of the Label Distribution Protocol (LDP LSP);

or

the active path is an Label Switch Path of the Traffic Engineering (TE LSP).

5. The method of claim 1, comprising:

determining whether a switchback condition is met after the traffic is switched from the active path to the standby path, and

switching the traffic transmitted on the standby path back to the active path if the switchback condition is met.

6. The method of claim 5, wherein the determining whether a switchback condition is met comprises:

obtaining the detection value of the communication quality of traffic transmitted on the active path, and determining whether the detection value reaches a first reference value;

if the detection value reaches a first reference value, the switchback condition is met;

if the detection value does not reach the first reference value, the switchback condition is not met.

7. The method of claim 5, wherein the determining whether a switchback condition is met comprises:

obtaining a first detection value and a second detection value in turn; and

determining whether the first detection value reaches a first preset reference value and determining whether the second detection value reaches a second preset reference value;

wherein the switchback condition is met when the first detection value reaches a first preset reference value and the second detection value reaches a second preset reference value;

the switchback condition is not met when the first detection value does not reach a first preset reference value or the second detection value does not reach a second preset reference value.

8. A path switching device, comprising:

a detecting module, configured to detect communication quality of traffic transmitted on an active path;

an obtaining module, configured to obtain a detection value according to the detection of the detecting module;

a determining module, configured to determine whether the detection value, obtained by the obtaining module, meets a switching condition; and

a switching module, configured to switch the traffic transmitted on the active path to a standby path when the determining module determines that the detection value meets the switching condition.

9. The path switching device of claim 8, comprising:

a detecting unit, configured to detect the communication quality of the traffic in the active path through the NQA.

10. The path switching device of claim 8, comprising:

a detecting unit, configured to detect the communication quality of the traffic in the IP switched path, or detect the communication quality of the traffic in the LDP LSP;

or

detect the communication quality of the traffic in the TE LSP.

11. The path switching device of claim 8, comprising:

a switchback module, configured to determine whether a switchback condition is met after the traffic is switched from the active path to the standby path and switch the traffic transmitted on the standby path back to the active path if the switchback condition is met.

12. The path switching device of claim 11, wherein the switchback module comprises:

an obtaining unit, configured to obtain a first detection value of the communication quality of the traffic transmitted on the active path when the switching module switches the traffic transmitted on the active path to the standby path;

a determining unit, configured to determine whether the first detection value reaches a first reference value; and

a switchback unit, configured to switch the traffic transmitted on the standby path back to the active path when the determining result is positive.

13. The path switching device of claim 11, wherein the switchback module comprises:

an obtaining unit, configured to obtain a first detection value and a second detection value;

a determining unit, configured to determine whether the first detection value reaches a first reference value and determine whether the second detection value reaches a second reference value; and

a switchback unit, configured to switch the traffic transmitted on the standby path back to the active path when the first detection value reaches the first reference value and the second detection value reaches the second reference value.