Method for implementing protection group overlay, and method and system for ethernet protection switching

• US 8,971,175 B2
• Filed: 12/14/2010
• Issued: 03/03/2015
• Est. Priority Date: 01/21/2010
• Status: Active Grant

• Current Assignee: ZTE Corporation
• Original Assignee: ZTE Corporation
• Inventors: Ao, Ting, Wei, Yuehua
• Primary Examiner(s): Rinehart, Mark
• Assistant Examiner(s): Kirillova, Ellen A
• Application Number:
  US13/574,237
• Publication Number:
  US 20120294141A1
• Time in Patent Office: 1,540 Days
• Field of Search: 370/218
• US Class Current: 370/218
• CPC Class Codes: H04L 1/22 using redundant apparatus to increase reliability
• CPC Class Codes: H04L 12/462 LAN interconnection over a bridge based backbone
• CPC Class Codes: H04L 12/4633 Interconnection of networks using encapsulation techniques, e.g. tunneling
• CPC Class Codes: H04L 2001/0096 Channel splitting in point-to-point links
• CPC Class Codes: H04L 41/0663 Performing the actions predefined by failover planning, e.g. switching to standby network elements
• CPC Class Codes: H04L 41/0668 by dynamic selection of recovery network elements, e.g. replacement by the most appropriate element after failure
• CPC Class Codes: H04L 45/00 Routing or path finding of packets in data switching networks routing or path finding in wireless networks H04W40/00
• CPC Class Codes: H04L 45/24 Multipath

Abstract

This disclosure discloses a method for implementing protection group overlay and a method for implementing Ethernet protection switching based on the protection group overlay. The method for implementing Ethernet protection switching based on the protection group overlay comprises: when the fault of TESI is detected by multiple IPG which protect the same TESI, only one IPG of the multiple nested IPGs performs protection switching. This disclosure further discloses a system for implementing Ethernet protection switching based on the protection group overlay, comprising a protection switching performing unit, configured to when a fault of a TESI is detected by multiple IPGs which protect the TESI, only one IPG of the multiple nested IPGs performing protection switching. Application of the method and system of this disclosure implements protection for key protected path through protection group overlay, and can achieve effects of saving network resource and increasing utilization rate of network resource.

Claims

1. A method for implementing protection group overlay, comprising:

using as nested protection groups multiple infrastructure protection groups (IPG) which protect a same traffic engineering service instance (TESI), wherein the number of the multiple IPGs is two, and they are IPG1 and IPG2 respectively;

constructing an IPG3 which takes the place of the IPG1, and performing fault detection and protection switching by both the IPG2 and the IPG3 to implement that there is only one IPG performing protection switching,

wherein constructing the IPG3 comprises;

using a segment, which includes a segment through a working segment of the IPG1 and a segment through a working segment of the IPG2, as a working segment of the IPG3, starting from an SEB of the IPG1;

using a segment, which includes a segment through the working segment of the IPG1 and a segment through a protection segment of the IPG2, as a protection segment 1 of the IPG3, starting from an SEB of the IPG1; and

using a protection segment of the IPG1 as a protection segment 2 of the IPG3, wherein a priority of the protection segment 1 is higher than a priority of the protection segment 2.

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

enabling two segment endpoint ports (SEP) of one IPG and SEPs or a segment intermediate port (SIP) of another IPG to share a provider network port (PNP).

3. A method for implementing Ethernet protection switching based on protection group overlay, comprising:

when a fault of a TESI is detected by multiple IPGs which protect a same TESI, only one IPG of the multiple nested IPGs performing protection switching, wherein the multiple IPGs are nested protection groups, and wherein the number of the multiple IPGS is two, and they are IPG1 and IPG2 respectively;

the step of only one IPG performing protection switching comprising constructing an IPG3 which takes the place of the IPG1, and performing fault detection and protection switching by both the IPG2 and the IPG3 to implement that there is only one IPG performing protection switching,

wherein constructing the IPG3 comprises;

using a segment, which includes a segment through a working segment of the IPG1 and a segment through a working segment of the IPG2, as a working segment of the IPG3, starting from an SEB of the IPG1;

using a segment, which includes a segment through the working segment of the IPG1 and a segment through a protection segment of the IPG2, as a protection segment 1 of the IPG3, starting from an SEB of the IPG1; and

using a protection segment of the IPG1 as a protection segment 2 of the IPG3, wherein a priority of the protection segment 1 is higher than a priority of the protection segment 2.

4. The method according to claim 3, wherein the step of only one IPG performing protection switching comprises:

when protection switching happens in the IPG2, the IPG1 does not perform protection switching;

or, when protection switching happens in the IPG1, the IPG2 does not perform protection switching.

5. The method according to claim 4, wherein the step of only one IPG performing protection switching further comprises that:

when faults occur on both a working segment and a protection segment in the IPG2, or fault occurs on other part of member segments in the IPG1, the IPG1 performs protection switching, wherein the other part of the member segments in the IPG1 is a part of segments in the IPG1 which is not included in the IPG2.

6. A system for implementing Ethernet protection switching based on protection group overlay, comprising:

a protection switching performing unit, configured to make only one IPG of the multiple nested IPGs perform protection switching when multiple IPGs which protect a same TESI detect a fault of the TESI, wherein;

the multiple IPGs are nested protection groups, and when the number of the multiple IPGs is two, they are IPG1 and IPG2 respectively,

the protection switching performing unit is further configured to construct an IPG3 which takes the place of the IPG1, wherein fault detection and protection switching is performed by both the IPG2 and the IPG3 to implement that there is only one IPG performing protection switching,

constructing the IPG3 comprises;

using a segment, which includes a segment through a working segment of the IPG1 and a segment through a working segment of the IPG2, as a working segment of the IPG3, starting from an SEB of the IPG1;

using a segment, which includes a segment through the working segment of the IPG1 and a segment through a protection segment of the IPG2, as a protection segment 1 of the IPG3, starting from an SEB of the IPG1; and

using a protection segment of the IPG1 as a protection segment 2 of the IPG3, wherein a priority of the protection segment 1 is higher than a priority of the protection segment 2.

7. The system according to claim 6, wherein the protection switching performing unit is further configured to make the IPG1 not perform protection switching, under the condition that the number of the multiple IPGs is two and they are respectively IPG1 and IPG2, when protection switching happens in the IPG2;

or, make the IPG2 not perform protection switching when protection switching happens in the IPG1.

8. The system according to claim 7, wherein the protection switching performing unit is further configured to make the IPG1 perform protection switching, when faults occur on both a working segment and a protection segment of the IPG2, or fault occurs on other parts of member segments of the IPG1, wherein said other parts of the member segments of the IPG1 are a part of segments of the IPG1 which is not included in the IPG2.