KR102000128B1 - Automatic protection switching state processing method, device and aps node - Google Patents

Abstract

The present invention provides an automatic protection switching APS state processing method, an apparatus, and an APS node, wherein the method includes determining that a node state of an automatic protection switching APS node is at least one of the following: Receiving an RR code and a reverse request code of a non-signal effective SF and a non-signal degradation SD and an RR code transmitted by other nodes other than the corresponding APS node; After the APS node transmits the reverse request RR code and receives the reverse request code of the signal effective SF and the signal deterioration SD and the RR code transmitted by other nodes other than the corresponding APS node, ≪ / RTI > Canceling the switching state of the APS node. Through the present invention, in the related art, the APS state of the node is switched between different switching states to solve the problem that the service packet is lost and affects the stability of the service, further saving the processing time of the protection switching , And the stability of the service is improved.

Description

TECHNICAL FIELD [0001] The present invention relates to an automatic protection switching APS state processing method, a device and an APS node,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the field of communications, and more particularly, to an automatic protection switching APS state processing method, apparatus and APS node.

The Packet Transfer Network (PTN) supports a dual directional point-to-point connection channel based on various packet switching services, is suitable for various rough / sophisticated services, end-to-end networking capability, Lt; RTI ID = 0.0 > a < / RTI > The protection characteristic is one of the great characteristics of PTN, it has various protection schemes, it can realize the telecommunication level service protection switching based on 50 ms when the network failure occurs, and realizes transmission level service protection and recovery .

The PTN facility shall follow the relevant description of "Packet transmission network (PTN) facility technology requirement". Section 10.3.7.2 provides detailed description of the ring network node APS (Automatic Protection Switching) protocol state and the state machine in detail. . In the implementation of the conventional APS protocol, there exists a hidden public key (for example, locking and forced switching protection). FIG. 1 is a topology structure diagram in which an APS state machine in the related art changes between a plurality of states. As shown in FIG. 1, the topology diagram is briefly referred to as A (westward) - (trend) ) C (Southwest) - (Trend) A.

Step 1: send locking protection in A's wake; Transmits the forced switch in the trend of B.

Since the priority of the locking protection is high, then the APS protocol request at point A is LP (locking protection); In B, the APS protocol request is LP (locking protection).

Step 2: After the state is stabilized, all of the sideways and trends of A should transmit the request code of the locking protection, B proceeds the RR (reverse request) response to the short path from the trend, Send the code.

Step 3: At some point, the APS byte at point B is transmitted at the end and the message has not yet arrived at A; At this time, the user of point A cancels the LP setting and transmits NR (no request).

Step 4: B receives the unsolicited code transmitted by A, and enters the switching state because the configured FS (forced switching) priority is the highest; A Receive the RR code in the southbound direction, receive the LP in the trend, and enter the LP again.

Step 5: A transmits the RR code in the southbound direction, and transmits the LP in the trend; B transmits FS to the trend, and FS to the west.

Step 6: A receives the APS transmitted by the other party, transmits the RR code in the westward direction, transmits FS in the trend, and enters the switching state; B transmits the RR to the trend, sends LP to the west, and enters the locking protection state.

Step 7: AB receives the APS sent by the other party again, sends the RR code in the westward direction, and sends the LP in the trend; B transmits the RR to the trend and FS to the west.

Thereafter, it circulates continuously between stages 6 and 7, and finally the APS state of the node is switched back and forth between the locking protection LP and the forced switching FS until the service packet is lost and the stability of the service is affected.

Therefore, in the related art, the APS state of the node is switched between the locking protection LP and the forced switching FS, and there is a problem that the service packet is lost and affects the stability of the service.

The present invention proposes an automatic protection switching APS state processing method, an apparatus and an APS node so that at least in the related art the APS state of the node is switched between the locking protection LP and the forced switching FS, so that the service packet is lost, To solve the problem that affects the environment.

According to one aspect of the present invention there is provided an automatic protection switching APS state processing method comprising determining that an automatic protection switching APS node has at least one node state of an automatic protection switching APS node, Node receives a reverse request RR code and also receives a reverse request code of a non-signal effective SF and a non-signal degradation SD and an RR code transmitted by other nodes than the APS node; After the APS node transmits the reverse request RR code and receives the reverse request code of the signal effective SF and the signal deterioration SD and the RR code transmitted by the other nodes other than the APS node, Exceeds the WTR time; And cancels the switching state of the APS node.

Preferably, the node status is such that the APS node transmits a reverse request RR code and also receives reverse request code of non-signaling SF and non-signal degradation SD and RR code transmitted by other nodes other than the APS node , And also determining that the APS node fails to detect a section layer failure and / or fails to receive an artificial switching operation command.

Preferably, the node status of the APS node is configured such that the APS node transmits a reverse request RR code, and further receives an RR code transmitted from the non-SF and the non-SD reverse request code and other nodes other than the APS node It is determined that the APS node receives the RR code transmitted by the other nodes other than the APS node on the short path and receives the reverse request code of the non-SF and non-SD on the long path.

Advantageously, the node status of the APS node is determined by the APS node transmitting the reverse request RR code and receiving the reverse request code of the SF and the SD and the RR code transmitted by other nodes other than the APS node, Determining that the APS node enters the recovery waiting WTR time and also exceeds the WTR time, the APS node receives the RR code transmitted by other nodes other than the APS node on the short path, Lt; RTI ID = 0.0 > request code < / RTI >

Advantageously, canceling the switching state of the APS node includes switching the switching state of the APS node to the idle state.

According to another aspect of the present invention, there is provided an automatic protection switching APS state processing apparatus, wherein a node status of an automatic protection switching APS node is at least one of the following: the APS node transmits a reverse request RR code, Receiving a reverse request code of an effective SF and a non-signal degradation SD and an RR code transmitted by another node other than the APS node; After the APS node transmits the reverse request RR code and receives the reverse request code of the signal effective SF and the signal deterioration SD and the RR code transmitted by the other nodes other than the APS node, Exceeding the WTR time; A first judgment module which is set to judge that the first judging module is judged to be judged to be judged; And a cancel module set to cancel the switching state of the APS node.

Advantageously, the APS state machine also includes a second determination module configured to determine that the APS node fails to detect a section layer failure and / or fails to receive an artificial switching operation command.

Preferably, the APS node receives the RR code transmitted by the other nodes other than the APS node on the short path, and determines that the APS node receives the non-SF and non-SD reverse request codes on the long path And a first judgment unit constituted.

Preferably, the APS node receives the RR code transmitted by the other nodes other than the APS node on the short path, and determines to receive the SF and the SD reverse request code on the long path And a second judgment unit constituted.

Advantageously, the cancellation module includes a switching unit configured to switch the switching state of the APS node to the idle state.

According to another aspect of the present invention, there is provided an apparatus as claimed in any of the preceding claims, which provides an automatic protection switching APS node.

Through the present invention, it is determined that the node status of the automatic protection switching APS node using the automatic protection switching APS node is at least one of the following: the APS node transmits the reverse request RR code, Receiving a reverse request code of non-signal degradation SD and an RR code transmitted by other nodes other than the APS node; After the APS node transmits the reverse request RR code and receives the reverse request code of the signal effective SF and the signal deterioration SD and the RR code transmitted by the other nodes other than the APS node, Exceeds the WTR time; And cancels the switching state of the APS node. This makes it possible to solve the problem that the APS state of the node is switched between the different switching states in the related art so that the service packet is lost and affects the stability of the service, further saving the processing time of the protection switching, .

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention, It is not. In the drawings:
BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a topology diagram in which the APS state machine in the related art changes between various states.
2 is a flow chart of an automatic protection switching APS state processing method in an embodiment of the present invention;
3 is a structural block diagram of an automatic protection switching APS state machine in an embodiment of the present invention;
4 is a block diagram of a preferred structure of an automatic protection switching APS state machine in an embodiment of the present invention;
5 is a block diagram of a preferred structure of the first judgment module 32 of the automatic protection switching APS state machine of the embodiment of the present invention.
6 is a block diagram of a preferred structure of the first judgment module 32 of the automatic protection switching APS state machine of the embodiment of the present invention.
7 is a schematic structural block diagram of a cancel module 34 in an automatic protection switching APS state machine of an embodiment of the present invention.
8 is a structural block diagram of an automatic protection switching APS node in an embodiment of the present invention.
9 is a flow chart of a transition from a switched state to an idle state of a preferred embodiment of the present invention;

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and embodiments. It should be noted that the features of the embodiments and embodiments of the present application can be combined with each other under non-collision situations.

FIG. 2 is a flowchart of an automatic protection switching APS state processing method according to an embodiment of the present invention. Referring to FIG. 2, Step.

Step S202: includes determining that the node status of the APS node is at least one of the following: the APS node transmits a reverse request RR code, and the reverse request of the non-signal effective SF and non-signal degradation SD Receiving an RR code transmitted by the code and other nodes other than the APS node; After the APS node transmits the reverse request RR code and receives the reverse request code of the signal effective SF and the signal deterioration SD and the RR code transmitted by other nodes other than the corresponding APS node, ≪ / RTI >

Step S204: Cancels the switching state of the APS node.

Through the above steps, it is determined whether or not the APS node is in an infinite loop due to a node state, that is, whether or not the node satisfies a predetermined condition. In this case, the APS node transmits a reverse request RR code And receives the reverse request code of the non-signal effective SF and the non-signal degradation SD and the RR code transmitted by the other nodes other than the corresponding APS node, or the corresponding APS node transmits the reverse request RR code, After receiving the reverse request code of the SF and the signal deterioration SD and the RR code transmitted by the other nodes other than the corresponding APS node, when it enters the recovery waiting WTR time and judges that the WTR time is exceeded, It is determined that the process should be executed, and then the switching state of the corresponding APS node is canceled. As a result, It is possible to prevent the packets from being lost due to the round trip switching cycle. By using the above processing, not only the above problem in the related art is solved, but also the processing time of the protection switching is saved at a certain level and the stability of the service is improved.

Preferably, the node status is such that the APS node transmits the reverse request RR code and also receives the reverse request code of the non-signal effective SF and the non-signal degradation SD and the RR code transmitted by other nodes other than the corresponding APS node , And also determines if a section layer fault has been detected at the APS node and / or whether an artificial switching operation command has been received, and if no failure is detected at the section layer in the APS node and / or an artificial switching operation command is not received , It is determined that the node status satisfies a predetermined condition.

In a situation where the node status is that the APS node transmits the reverse request RR code and also receives the reverse request code of the non-SF and non-SD and the RR code transmitted by other nodes other than the corresponding APS node, It can be determined that the APS node receives the reverse request code on the short path and receives the reverse request code of the non-SF and non-SD on the long path.

In addition, the node status satisfies a predetermined condition when the APS node transmits the reverse request RR code and also receives the reverse request code of SF and SD and the RR code transmitted by other nodes other than the corresponding APS node At the time of judgment, it can be determined that the APS node receives the reverse request code on the short path and receives the reverse request code of SF and SD on the long path.

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

The embodiment of the present invention also provides an automatic protection switching APS state processing apparatus, which implements the above-described embodiment and the preferred embodiment, and avoids redundant explanations for portions that have already been described. The term "module" used below may be a combination of software and / or hardware that implements a predetermined function. The apparatus described in the following embodiments is preferably implemented by software, but it is also possible to implement hardware or a combination of software and hardware.

FIG. 3 is a structural block diagram 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 judgment module 32 and a cancellation module 34, Proceed with the detailed description of the device below.

The first decision module 32 determines whether the APS node has at least one of the following statuses: the APS node transmits a reverse request RR code and the reverse request code of the non-signal effective SF and non- And an RR code transmitted by other nodes other than the corresponding APS node; After the APS node transmits the reverse request RR code and receives the reverse request code of the signal effective SF and the signal deterioration SD and the RR code transmitted by other nodes other than the corresponding APS node, ≪ / RTI > The cancellation module 34 is connected to the first determination module 32 and is set to cancel the switching state of the APS node.

FIG. 4 is a structural block diagram 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 module shown in FIG. 3, 42), and the detailed description will be given to the second judgment module 42 below.

The second determination module 42 is connected to the first determination module 32 and the cancellation module 34. The node status indicates that the APS node transmits the reverse request RR code and the non-signal effective SF and non- And an RR code transmitted by other nodes other than the corresponding APS node, after which it is determined that the APS node fails to detect the section layer failure and / or fails to receive the artificial switching operation command.

FIG. 5 is a block diagram of a preferred embodiment of the first judgment module 32 of the automatic protection switching APS state processing apparatus according to the embodiment of the present invention. As shown in FIG. 5, The judging unit 52 is included, and the detailed description will be given to the first judging unit 52 below.

The first determination unit 52 is configured to determine that the APS node receives the RR code transmitted by the other nodes other than the corresponding APS node on the short path and receives the reverse request code of the non-SF and non-SD on the long path.

FIG. 6 is a block diagram of a preferred structure of the first judgment module 32 of the automatic protection switching APS state processing apparatus according to the embodiment of the present invention. As shown in FIG. 6, The judging unit 62 is included and the detailed description of the second judging unit 62 will be given below.

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

7 is a structural block diagram of the cancel 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 cancel module 34 includes a switching unit 72 The switching unit 72 will be described in detail below.

The switching unit 72 is set 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 the APS state processor 82 of the arbitrary term.

In the related art, the present invention provides a method for improving the stability of the ring network protection state, in which the switching state caused by the APS state of the node being not stable is switched back and forth. The main contents of the plan are as follows.

1. Description of the ring network protection switching APS state machine described in "Packet transmission network (PTN) facility technology requirements".

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

3. If the node receives the reverse request code of SF and SD and also sends the reverse request code itself, it enters the WTR time and cancels the switching state of this node after the WTR time has expired.

Let's go through the example below.

Methods to improve the stability of the ring network protection state include the following steps.

The topology drawing is briefly described as A (Southeast) - (Trend) B (Southeast) - (Trend) C (Southeast) - (Trend)

Stage 1: transmitting the protection of locking in the west of A; Transmits the forced switch in the trend of B.

Since the priority of the locking protection is high, the APS protocol state at this point is locking protection; The APS protocol status in B is locking protection.

Step 2: After the state is stabilized, all of the sideways and trends of A should send the request code of locking protection, B proceeds the RR response in the short path of the trend, and sends the LP request code in the long distance path.

Step 3: At some time, the locking protection APS byte of point B has been transmitted and the message has not yet arrived at A; At this time, the user A cancels the LP setting and transmits the no-request code.

Step 4: A receives the RR code in the southbound direction, receives the LP code in trends, and enters the locking protection state again; B receives the unsolicited code sent by A, and enters the forced switching state because the configured FS priority is the highest.

Step 5: A sends the RR code to the southbound direction and sends LP to the trend; B transmits FS to the trend, and FS to the west.

Step 6: A receives the RR code in a sideways direction and receives the FS code as a trend, at which time the locking protection is canceled by module 2 and the non-switching state is entered; B then receives the RR code as the trend and receives the LP code as the west, at which time it calculates the switching state again and still maintains the forced switching state.

Step 7: AB receives the APS sent by the other party again, and then sends the RR code to the A node and transmits the FS as the trend; B transmits FS in the trend and FS in the west.

As a result, the ring network switching state is stabilized to the forced switching state.

Not only solves the problem that the node protection state is switched back and forth through the embodiment and the preferred embodiment, but also saves processing time of protection switching and improves service stability.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

FIG. 9 is a flow chart illustrating a transition from a switching state to an idle state in the 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 has timed out. If the WTR has timed out, the bridge connection and switching are abandoned, the idle state is changed, and the NR request code is transmitted eastward.

In step S904, it is determined whether or not the artificial switching command issued from the outside has been removed. If the artificial switching command issued from the outside has been removed, the bridge connection and switching are abandoned and changed to the idle state. .

In step S906, it is determined whether the east-west direction receives the NR request. If the east-west direction receives the NR request, the bridge connection and switching are abandoned, the idle state is changed, and the NR request code is transmitted eastward.

In step S908, it is determined whether the APS request transmitted by itself has been received. If the APS request is received in the trend or western area, it is determined whether the APS request is received.

Step S910: If no other APS request has been received, it is immediately changed to the idle state and the NR request code should be sent east-west.

Step S912: If another APS request is received, it operates according to the currently received APS request.

Step S914: The node receives the RR code on the short path, receives the switching code of the non-SF / SD on the long path, and if the node does not detect the section layer failure and does not receive the external artificial operation command , Enters the idle state and transmits the NR code.

Step S916: When the RR code is received on the short path and the SF / SD switching code is received on the long path, the WRT state is entered without canceling the switching.

The skilled artisan will appreciate that each module or step of the invention can be implemented through a common computing device, which may be integrated on a single computing device or distributed over a network of multiple computing devices, These may be implemented by program code executable in the computing device, so they may be stored in a storage device and executed in a computing device, and in some situations, proceeding in a different order than the above sequence, , Or multiple modules or steps thereof may be implemented as a single integrated circuit module. Thus, the present invention is not limited to any particular combination of hardware and software.

While the present invention has been particularly shown and described with reference to certain preferred embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but many variations and modifications may be made without departing from the scope of the present invention. . Modifications, substitutions, and improvements that come within the scope of the technical idea of the invention are all within the scope of the present invention.

As described above, through the above-described embodiment and the preferred embodiment, in the related art, the APS state of the node is switched between the different switching states to solve the problem that the service packet is lost and the stability of the service is affected , Further saving the processing time of the protection switching and improving the stability of the service.

Claims (11)

A method for processing an automatic protection switching APS state,
If the node status of the Auto-Protect Switching APS node is set to a preset condition,
The APS node transmits a reverse request RR code and also receives an RR code transmitted by other nodes other than the APS node and other reverse request codes other than the signal effective SF and the signal degradation SD; Or after the APS node transmits a reverse request RR code and receives an RR code from the signaling SF and the signal degradation SD reverse request code and other nodes other than the APS node, Exceeding the WTR time; Judges whether or not the condition is satisfied,
And canceling the switching state of the APS node if the node state of the APS node meets a predetermined condition. The method of claim 1, wherein the node status is determined by the APS node transmitting a reverse request RR code and receiving an RR code transmitted by other nodes other than the APS node and other reverse request codes other than the signaling SF and the signal degradation SD After that,
And determining that the APS node fails to detect a section layer failure and / or fails to receive an artificial switching operation command. 2. The method of claim 1, wherein the node status of the APS node is determined based on whether the APS node transmits a reverse request RR code, and the reverse RR code other than the signal effective SF and the signal degradation SD, To determine that the code is received,
Characterized in that the APS node receives the RR code transmitted by the other nodes other than the APS node on the short path and determines that the APS node receives the other effective reverse request code in addition to the signal effective SF and the signal degradation SD on the long path The automatic protection switching APS state processing method. 2. The method of claim 1, wherein the node status of the APS node is determined based on whether the APS node transmits a reverse request RR code and the reverse request code of the signal effective SF and the signal degradation SD and the RR code After entering the recovery waiting WTR time and determining that it exceeds the WTR time,
Determining that the APS node receives the RR code transmitted by the other node on the short path and is transmitted from the other node on the short path and receives the reverse request code of the signal effective SF and the signal degradation SD on the long path Automatic protection switching APS state processing method. The method of claim 1, wherein canceling the switching state of the APS node comprises:
And switching the switching state of the APS node to an idle state. An automatic protection switching APS state machine, comprising:
The node status of the APS node is set to a predetermined condition, the APS node transmits a reverse request RR code, and the RR code transmitted from other nodes other than the APS node and other reverse request codes other than the signal- ≪ / RTI > Or after the APS node transmits a reverse request RR code and receives another reverse request code other than the signal effective SF and the signal degradation SD and an RR code transmitted by other nodes other than the APS node, Exceeding said WTR time; A first determination module configured to determine whether a condition is satisfied;
Wherein the canceling module is configured to cancel the switching state of the APS node if the node state of the APS node meets a predetermined condition. 7. The method of claim 6, further comprising:
And a second determination module configured to determine that the APS node fails to detect a section layer failure and / or does not receive an artificial switching operation command. 7. The apparatus of claim 6, wherein the first determination module
The APS node is configured to receive the RR code transmitted by the other node on the short path, other than the APS node, and to determine that the APS node receives the signaling effective SF and other reverse request codes other than the signal degradation SD on the long path Wherein the APS state machine comprises: 7. The apparatus of claim 6, wherein the first determination module
The APS node receives an RR code transmitted by other nodes other than the APS node on a short path and determines to receive the reverse request code of the signal effective SF and the signal degradation SD on a long path, And an automatic protection switching APS state machine. 7. The method of claim 6, wherein the cancel module
And a switching unit configured to switch the switching state of the APS node to the idle state. An autoprotection switching APS node comprising the apparatus of any one of claims 6 to 10.

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