WO2015184727A1

WO2015184727A1 - Automatic protection switching state processing method, device and aps node

Info

Publication number: WO2015184727A1
Application number: PCT/CN2014/089493
Authority: WO
Inventors: 李克军
Original assignee: 中兴通讯股份有限公司
Priority date: 2014-07-02
Filing date: 2014-10-24
Publication date: 2015-12-10
Also published as: CN105227339B; KR20170028954A; JP2017521943A; CN105227339A; KR102000128B1

Abstract

Provided are an automatic protection switching (APS) state processing method, device and APS node, the method comprising: determining that the status of an APS node is at least one of the following: the APS node issues a reverse request (RR) code, and receives a reverse request code of a non-signal failure (SF) and a non-signal degradation (SD) and RR codes issued by other nodes except the APS node; the APS node issues an RR code, enters wait to restore (WTR) time after receiving the reverse request code of a signal failure (SF) and a signal degradation (SD) and the RR codes issued by other nodes except the APS node, and exceeds the WTR time; and revoking the switching state of the APS node. The present invention solves the problem in the relevant art of service packet loss caused by frequent switching of the APS state of a node between different switching states, shortens the processing time of protection switching, and improves service stability.

Description

Automatic protection switching APS state processing method, device and APS node

Technical field

The present invention relates to the field of communications, and in particular, to an automatic protection switching APS state processing method and apparatus, and an APS node.

Background technique

The Packet Transfer Network (PTN) supports a variety of bidirectional point-to-point connection channels based on packet switching services. It has the ability to adapt to various granular services and end-to-end networking capabilities, and provides transmissions more suitable for IP service characteristics. pipeline. The protection feature is a major feature of the PTN. It has a rich protection mode. When a network failure occurs, it can implement a 50-ms carrier-class service protection switching to achieve service level protection and recovery at the transmission level.

The PTN equipment needs to comply with the relevant instructions of the Packet Transport Network (PTN) Equipment Technical Requirements. In Section 10.3.7.2, the specific scheme of the ring node APS (Automatic Protection Switching) protocol status and state machine is described in detail. In the implementation of the existing APS protocol, the following hidden dangers exist (taking protection lock and forced switching as an example). 1 is a topological structural diagram of transitions between states of an APS state machine in the related art. As shown in FIG. 1, the topology diagram is as follows: A (westward) - (eastward) B (westward) - (eastward) C (westward) - (eastward) A.

Step 1, in the west of A, the protection is blocked; the eastward of B is forced to switch.

Because the protection blocking priority is high, the APS protocol request at point A is LP (protection blocking); the APS protocol request above B is LP (protection blocking).

Step 2: After the state is stable, the west and east directions of A should send a request code for protection blocking, B responds to the RR in the east direction (reverse request), and sends the LP request code to the west long path.

Step 3. At a certain moment, the APS byte of point B is just sent out, and the message has not been delivered to A; at this time, the user at point A cancels the LP setting and issues NR (no request).

In step 4, B receives the no-request code sent by A. At this time, the configured FS (forced switching) has the highest priority and enters the switching state; A receives the RR code in the west direction, receives the LP in the east direction, and enters the LP again.

In step 5, A sends an RR code to the west, and LP to the east; B sends FS to the east and FS to the west.

Step 6: After receiving the APS sent by the other party, A sends an RR code to the west, and sends an FS to the east to enter the switching state. B sends the RR to the east and LP to the west to enter the protection lock state.

Step 7, after the AB receives the APS sent by the other party again, the RR code is issued in the west direction, and the LP is sent in the east direction; the RR is issued in the east direction and the FS is issued in the west direction.

After that, the APS state of the node is switched back and forth between the protection lock LP and the forced switching FS, resulting in packet loss and affecting service stability.

Therefore, in the related art, the APS state of the node is in a state of switching back and forth between the protection latching LP and the forced switching FS, resulting in packet loss of the service and affecting the stability of the service.

Summary of the invention

The present invention provides an automatic protection switching APS state processing method and device, and an automatic protection switching APS node, so as to at least solve the related art, the node APS state exists in a state of switching back and forth between the protection blocking LP and the forced switching FS, resulting in Business packet loss affects the stability of the business.

According to an aspect of the present invention, an automatic protection switching APS state processing method is provided, including: an automatic protection switching APS node determines that a node state of an automatic protection switching APS node is at least one of the following: the APS node issues a reverse request RR a code, and receiving a reverse request code of the non-signal failure SF and the non-signal degraded SD and an RR code sent by other nodes than the APS node; the APS node issues a reverse request RR code, and upon receiving After the reverse request code of the signal failure SF and the signal degradation SD and the RR code sent by other nodes than the APS node, the recovery waits for the WTR time and exceeds the WTR time; the switching state of the APS node is revoked .

Preferably, the node request status is a reverse request RR code for the APS node, and a reverse request code for receiving a non-signal failure SF and a non-signal degradation SD and a node issued by a node other than the APS node After the RR code, the method further includes: determining that no segment fault is detected at the APS node and/or no manual switching operation command is received.

Preferably, determining a node status of the APS node to send a reverse request RR code to the APS node, and receiving the non-SF and the non-SD reverse request code and other than the APS node The RR code sent by the node includes: determining that the APS node receives an RR code sent by a node other than the APS node on a short path, and receives a non-SF and non-SD reverse request code on a long path.

Preferably, determining a node status of the APS node is a reverse request RR code sent by the APS node, and receiving a reverse request code of the SF and the SD and other nodes except the APS node Issue After the RR code, entering the recovery waiting WTR time, and exceeding the WTR time includes: determining that the APS node receives the RR code sent by other nodes than the APS node on the short path, and receives the long path. Reverse request code to the SF and the SD.

Preferably, the reversing the switching state of the APS node comprises: switching the switching state of the APS node to an idle state.

According to still another aspect of the present invention, there is provided an automatic protection switching APS state processing apparatus, including: a first determining module, configured to determine that a node state of an automatic protection switching APS node is at least one of: the APS node sends an inverse Requesting an RR code, and receiving a reverse request code of a non-signal failure SF and a non-signal degraded SD and an RR code sent by a node other than the APS node; the APS node issues a reverse request RR code, and After receiving the reverse request code of the signal failure SF and the signal degradation SD and the RR code sent by other nodes than the APS node, entering the recovery waiting WTR time and exceeding the WTR time; the undo module is set to The switching state of the APS node is revoked.

Preferably, the APS state processing device further comprises: a second determining module, configured to determine that no segment fault is detected at the APS node and/or no manual switching operation command is received.

Preferably, the first determining module includes: a first determining unit, configured to determine that the APS node receives an RR code sent by a node other than the APS node on a short path, and receives the RR code on a long path. Non-SF and non-SD reverse request codes.

Preferably, the first determining module includes: a second determining unit, configured to determine that the APS node receives an RR code sent by a node other than the APS node on a short path, and receives the long code The reverse request code of the SF and the SD.

Preferably, the undo module comprises: a switching unit configured to switch the switching state of the APS node to an idle state.

According to still another aspect of the present invention, there is provided an automatic protection switching APS node, comprising the apparatus of any of the above.

According to the present invention, the automatic protection switching APS node is used to determine that the node state of the automatic protection switching APS node is at least one of the following: the APS node sends a reverse request RR code, and receives a non-signal failure SF and a non-signal degradation SD a request code and an RR code issued by a node other than the APS node; the APS node issues a reverse request RR code, and receives a reverse request code for the signal failure SF and the signal degradation SD and After the RR code sent by other nodes other than the APS node, the recovery waits for the WTR time. And the WTR time is exceeded; the switching state of the APS node is cancelled, and the APS state of the node in the related technology is switched back and forth in different switching states, causing service packet loss and affecting service stability, thereby achieving the problem. It saves the processing time of protection switching and improves the stability of the business.

DRAWINGS

The drawings described herein are intended to provide a further understanding of the invention, and are intended to be a part of the invention. In the drawing:

1 is a topological structural diagram of transitions between states of an APS state machine in the related art;

2 is a flowchart of an automatic protection switching APS state processing method according to an embodiment of the present invention;

3 is a structural block diagram of an automatic protection switching APS state processing apparatus according to an embodiment of the present invention;

4 is a block diagram showing a preferred structure of an automatic protection switching APS state processing apparatus according to an embodiment of the present invention;

5 is a block diagram 1 of a preferred structure of the first determining module 32 in the automatic protection switching APS state processing apparatus according to an embodiment of the present invention;

6 is a block diagram 2 of a preferred structure of the first determining module 32 in the automatic protection switching APS state processing apparatus according to an embodiment of the present invention;

7 is a block diagram showing a preferred structure of an undo module 34 in an automatic protection switching APS state processing apparatus according to an embodiment of the present invention;

8 is a structural block diagram of an automatic protection switching APS node according to an embodiment of the present invention;

9 is a flow diagram of a switch state to idle state transition in accordance with a preferred embodiment of the present invention.

detailed description

The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

In this embodiment, an automatic protection switching APS state processing method is provided. FIG. 2 is a flowchart of an automatic protection switching APS state processing method according to an embodiment of the present invention. As shown in FIG. 2, the process includes the following steps:

Step S202, determining that the node status of the automatic protection switching APS node is at least one of the following: the APS node sends a reverse request RR code, and receives a reverse request code of the non-signal failed SF and the non-signal degraded SD and the APS node RR code sent by other nodes; the APS node sends a reverse request RR code, and after receiving the reverse request code of the signal failure SF and the signal degradation SD and the RR code sent by other nodes than the APS node, Entering recovery waits for WTR time and exceeds the WTR time;

In step S204, the switching state of the APS node is revoked.

Through the above steps, it is determined whether the APS node is in an infinite loop state according to the state of the node, that is, whether the node state satisfies a predetermined condition, when the APS node issues a reverse request RR code, and receives non-signal failure SF and non-signal degradation. The reverse request code of the SD and the RR code sent by other nodes than the APS node, or the reverse request code that the APS node issues the reverse request RR code and receives the signal failure SF and the signal degradation SD And after the RR code sent by the other node except the APS node, the recovery waits for the WTR time, and when the WTR time is exceeded, it may be determined that the APS node needs to perform the change process of the switching state, and then the switching state of the APS node is cancelled. Compared with the related art, the node is always in a loop of switching back and forth, resulting in packet loss of the service. The above processing not only effectively solves the above problems in the related art, but also saves the processing time of the protection switching to a certain extent, and improves the stability of the service.

Preferably, after the node status is a reverse request RR code for the APS node, and the reverse request code of the non-signal failure SF and the non-signal degraded SD and the RR code sent by other nodes than the APS node are received, Whether the APS node detects a segment layer fault and/or receives a manual switching operation command, and determines that the node state satisfies the predetermined condition after the APS node does not detect the segment layer fault and/or does not receive the manual switching operation command.

In addition, when the node status is a reverse request RR code for the APS node, and the non-SF and non-SD reverse request code and the RR code sent by other nodes than the APS node are received, it is determined that the node status is satisfied. When the condition is predetermined, the following can be determined: it is determined that the APS node receives the reverse request code on the short path, and receives the non-SF and non-SD reverse request code on the long path.

And, when the node status is a reverse request RR code for the APS node, and the reverse request code of the SF and the SD and the RR code sent by the other node except the APS node are received, determining that the node status satisfies the predetermined condition At this time, the following can be determined: it is determined that the APS node receives the reverse request code on the short path, and receives the reverse request code of the SF and the SD on the long path.

The undoing state of the APS node may be to switch the switching state of the APS node to the idle state.

In the embodiment, an automatic protection switching APS state processing device is also provided, which is used to implement the above-mentioned embodiments and preferred embodiments, and has not been described again. As used below, the term "module" may implement a combination of software and/or hardware of a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.

3 is a block diagram showing the structure of an automatic protection switching APS state processing apparatus according to an embodiment of the present invention. As shown in FIG. 3, the apparatus includes a first determining module 32 and an undoing module 34, which will be described below.

The first determining module 32 is configured to determine that the node status of the automatic protection switching APS node is at least one of the following: the APS node sends a reverse request RR code, and receives a reverse request code of the non-signal failure SF and the non-signal degradation SD. An RR code sent by a node other than the APS node; the APS node issues a reverse request RR code, and a reverse request code that receives the signal failure SF and the signal degradation SD and other nodes other than the APS node After the RR code, the recovery waits for the WTR time and exceeds the WTR time; the undo module 34 is connected to the first determining module 32, and is set to undo the switching state of the APS node.

4 is a block diagram of a preferred structure of an automatic protection switching APS state processing apparatus according to an embodiment of the present invention. As shown in FIG. 4, the apparatus includes a second determining module 42 in addition to the module shown in FIG. The second determining module 42 is described.

The second determining module 42 is connected to the first determining module 32 and the undoing module 34, and is configured to issue a reverse request RR code for the APS node in the node state, and receive a reverse request of the non-signal failure SF and the non-signal degradation SD. After the code and the RR code sent by other nodes than the APS node, it is determined that no segment fault is detected at the APS node and/or no manual switching operation command is received.

FIG. 5 is a block diagram of a preferred structure of the first determining module 32 in the automatic protection switching APS state processing apparatus according to the embodiment of the present invention. As shown in FIG. 5, the first determining module 32 includes a first determining unit 52. The first determining unit 52 is explained.

The first determining unit 52 is configured to determine that the APS node receives the RR code sent by other nodes than the APS node on the short path, and receives the non-SF and non-SD reverse request codes on the long path.

FIG. 6 is a block diagram of a preferred structure of the first determining module 32 in the automatic protection switching APS state processing apparatus according to the embodiment of the present invention. As shown in FIG. 6, the first determining module 32 includes a second determining unit 62. This second determination 62 is described.

The second determining unit 62 is configured to determine that the APS node receives the RR code sent by other nodes than the APS node on the short path, and receives the reverse request code of the SF and the SD on the long path.

FIG. 7 is a block diagram showing a preferred structure of the undo module 34 in the automatic protection switching APS state processing apparatus according to the embodiment of the present invention. As shown in FIG. 7, the undo module 34 includes: a switching unit 72, and the switching unit 72 is described below. .

The switching unit 72 is configured to switch the switching state of the APS node to the idle state.

FIG. 8 is a structural block diagram of an automatic protection switching APS node according to an embodiment of the present invention. As shown in FIG. 8, the APS node 80 includes any one of the APS state processing devices 82 described above.

Aiming at the problem that the switching state of the node is switched back and forth caused by the unstable APS state of the node in the related art, a scheme for improving the stability of the ring network protection state is proposed. The main contents of the program include:

1. Description of the ring network protection switching APS state machine described in "Technical Requirements for Packet Transport Network (PTN) Equipment".

2. If the node receives the reverse request code of non-SF and SD, and also sends the reverse request code itself, the original switching state of the node is cancelled.

3. If the node receives the reverse request code of SF and SD, and also sends the reverse request code itself, it should enter the WTR time and cancel the switching state of the node after the WTR time ends.

The following description will be made with reference to examples.

The method for improving the ring network protection state stability includes the following steps:

The topology map is as follows: A (westward) - (eastward) B (westward) - (eastward) C (westward) - (eastward) A.

In the first step, the protection is blocked in the west of A; the forced downward switching is performed in the east of B.

Because the protection blocking priority is high, the APS protocol status at point A is protection blocking; the APS protocol status on B is protection blocking.

In the second step, after the state is stable, the west and east directions of A should send a request code for protection lockout. B responds to the RR in the east direction and sends the LP request code to the west long path.

The third step, at some point, the protection point A of the point B is just sent out, the message has not been delivered to A; at this time, the user at point A cancels the LP setting and issues a no-request code.

In the fourth step, the A receives the RR code in the west direction, receives the LP code in the east direction, and enters the protection lock state again. B receives the no-request code sent by A. The FS priority is the highest and the forced switching state is entered.

In the fifth step, A sends the RR code to the west and LP to the east; B sends the FS to the east and FS to the west.

In the sixth step, the A node receives the RR code in the west direction and receives the FS code in the east direction. At this time, according to the module 2, the protection lock state is revoked and the non-switching state is entered; B receives the RR code in the east direction and receives the LP code in the west direction. At this time, the switching state is recalculated and the forced switching state is still maintained.

In the seventh step, after AB receives the APS sent by the other party again, the A node sends the RR code to the west and the FS to the east; B sends the FS to the east and FS to the west.

At this point, the ring network switching state is stable to the forced switching state.

The above embodiments and the preferred embodiments not only solve the problem that the node protection state is switched back and forth, but also save the protection switching time and improve the stability of the service.

The following drawings illustrate preferred embodiments of the invention.

9 is a flow chart of a transition state to an idle state transition according to a preferred embodiment of the present invention. As shown in FIG. 9, the flow includes the following steps:

In step S902, it is determined whether the WTR is timed out. If the WTR times out, the bridge and the switchover should be abandoned, the transition to the idle state, and the NR request code be sent to the east-west direction.

In step S904, it is judged whether the externally initiated manual switching command is clear. If the externally initiated manual switching command is cleared, the bridge and the switching should be abandoned, the transition to the idle state, and the NR request code be sent to the east-west direction.

In step S906, it is determined whether the NR request is received in the east-west direction. If the NR request is received in the east-west direction, the bridge and the switchover should be abandoned, the transition to the idle state, and the NR request code be sent to the east-west direction.

In step S908, it is determined whether the APS request sent by itself is received, and if the APS request sent by itself is received in the east or west direction, it is determined whether another APS request has been received at the same time.

Step S910, if no other APS request is received at the same time, it should immediately migrate to the idle state and issue an NR request code to the east-west direction.

Step S912, if another APS request is received, the action is performed according to the highest received APS request currently received.

Step S914, the node receives the RR code on the short path, and receives the non-SF/SD switching code in the long path. If the node does not detect the segment layer fault at this time, and does not receive the external manual operation command, then the node enters the idle state. Status, issued NR code.

In step S916, if the RR code is received on the short path and the SF/SD switching code is received in the long path, the switching should not be cancelled, but the WTR state is entered.

It will be apparent to those skilled in the art that the various modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Industrial applicability

As described above, the foregoing embodiments and the preferred embodiments are provided to solve the problem that the APS state of the node in the related art is switched back and forth in different switching states, causing service packet loss and affecting service stability, thereby achieving protection. The processing time of the switching improves the stability of the business.

Claims

An automatic protection switching APS state processing method includes:

Determining a node state of the automatic protection switching APS node as at least one of: the APS node issuing a reverse request RR code, and receiving a reverse request code of the non-signal failure SF and the non-signal degradation SD and the APS node RR code sent by other nodes; the APS node sends a reverse request RR code, and receives the reverse request code of the signal failure SF and the signal degradation SD and the RR sent by other nodes than the APS node After the code, enter the recovery wait WTR time, and exceed the WTR time;

The switching state of the APS node is revoked.
The method according to claim 1, wherein a reverse request RR code is issued in the node state for the APS node, and a reverse request code of a non-signal failure SF and a non-signal degradation SD is received and the APS is received After the RR code sent by other nodes other than the node, it also includes:

It is determined that no segment fault has been detected at the APS node and/or no manual switching operation command has been received.
The method of claim 1, wherein determining a node status of the APS node is a reverse request RR code for the APS node, and receiving the non-SF and the non-SD reverse request code and The RR code sent by other nodes except the APS node includes:

Determining that the APS node receives an RR code sent by a node other than the APS node on a short path, and receives a non-SF and non-SD reverse request code on a long path.
The method of claim 1, wherein determining a node status of the APS node is a reverse request RR code for the APS node, and receiving a reverse request code and a de-assertion of the SF and the SD After the RR code sent by other nodes than the APS node, the recovery waits for the WTR time, and the time exceeding the WTR includes:

Determining that the APS node receives an RR code sent by a node other than the APS node on a short path, and receives a reverse request code of the SF and the SD on a long path.
The method of claim 1, wherein the undoing the switching state of the APS node comprises:

Switching the switching state of the APS node to an idle state.
An automatic protection switching APS state processing device includes:

The first determining module is configured to determine that the node status of the automatic protection switching APS node is at least one of the following: the APS node sends a reverse request RR code, and receives a reverse request code of the non-signal invalid SF and the non-signal degraded SD And an RR code sent by a node other than the APS node; the APS node issues a reverse request RR code, and receives a reverse request code of the signal invalidation SF and the signal degradation SD and the APS node After the RR code sent by other nodes, the recovery waits for the WTR time and exceeds the WTR time;

The undo module is set to undo the switching state of the APS node.
The apparatus of claim 6 further comprising:

The second determining module is configured to determine that no segment fault is detected at the APS node and/or no manual switching operation command is received.
The apparatus of claim 6, wherein the first determining module comprises:

The first determining unit is configured to determine that the APS node receives an RR code sent by a node other than the APS node on a short path, and receives a non-SF and non-SD reverse request code on a long path.
The apparatus of claim 6, wherein the first determining module comprises:

a second determining unit, configured to determine that the APS node receives an RR code sent by a node other than the APS node on a short path, and receives a reverse request of the SF and the SD on a long path code.
The apparatus of claim 6 wherein said undo module comprises:

The switching unit is configured to switch the switching state of the APS node to an idle state.
An automatic protection switching APS node, comprising the apparatus of any one of claims 6 to 10.