CN102148694B - A kind of linear 1:N guard method of grouping conveying network, device and system - Google Patents

Abstract

The invention discloses a linear 1:N protection method and device for a packet transmission network, which can notify the remote node to perform 1:N protection switching for the working path after the destination node detects that the working path fails; the remote node According to the working path situation detected by itself and the notification from the destination node, determine the working path to perform 1:N protection switching and perform protection switching and notify the destination node that the working path of the protection switching has been executed; The notification of the node is to perform 1:N protection switching on the working path on which the remote node has performed protection switching. The method and device of the invention can realize the linear 1:N protection of the packet transmission network and save the bandwidth.

Description

A linear 1:N protection method, device and system for packet transmission network

technical field

The present invention relates to communication technology, in particular to a linear 1:N protection method, device and system for a packet transmission network.

Background technique

With the continuous development of packet transport network (packet transport network, PTN) technology, PTN will gradually become the main access technology of various network operators. The PTN defined now includes but is not limited to the following networks: MPLS, T-MPLS, MPLS-TP, Ethernet, etc., and its network protection is of great significance.

RFC5654 proposes that MPLS-TP must support pseudowire (pseudowire, PW) and label switching path (labelswitchingpath, LSP) point-to-point (pointtopoint, P2P) bidirectional 1:N linear protection switching, and must support point-to-multipoint (pointtomultipoint, P2MP) unidirectional 1:N protection switching.

Among them, unidirectional protection means that only the services in the affected direction are switched; bidirectional means that services in both directions are switched; 1:N protection means that one protection path protects N working paths, and the bandwidth of the protection path must be at least Greater than or equal to the bandwidth of the path with the largest bandwidth among the N working paths, which is mostly used for branch signal and equipment board-level protection.

For 1:N protection, since the probability that N working paths or equipment boards fail at the same time is very low, network resources can be effectively used, but the cost is that the protection switching time is slower than that of the 1:1 protection scheme.

In the currently defined 1:1 protection scheme, the first and last nodes of the working path and the protection path are configured with a Protection state coordination (PSC) protocol. When the working path fails, the node that detects the failure switches the traffic to the protection path. and send APS protection switching signaling to the remote end of the path, and the remote end also switches the traffic to the protection path after receiving the protection switching signaling.

Although the above-mentioned 1:1 protection scheme only needs to exchange signaling messages once between the first and last nodes to complete the switchover, the bandwidth is seriously wasted.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a linear 1:N protection method and device for a packet transmission network, so as to realize the linear 1:N protection of a packet transmission network and save bandwidth.

Another object of the present invention is to provide a linear 1:N protection system for a packet transmission network, so as to realize the linear 1:N protection of the packet transmission network and save bandwidth.

In order to achieve the above object, technical solution of the present invention is achieved in that way:

A linear 1:N protection method for a packet transmission network, the method comprising:

After the destination node detects that the working path fails, it notifies the remote node to perform 1:N protection switching for the working path;

The remote node determines the working path to perform 1:N protection switching according to the working path situation detected by itself and the notification from the destination node, and performs protection switching and notifies the destination node that the working path of the protection switching has been executed;

The destination node performs 1:N protection switching on the working path on which the remote node has performed protection switching according to the notification from the remote node.

Further includes:

The request for indicating 1:N protection switching and the content of the protection switching command indicating a specific working path are expanded in advance.

The method for the remote node to determine the working path to perform the 1:N protection switching is as follows:

The remote node itself does not detect the failure of the working path, and bridges the traffic of the receiving end and the sending end of the working path notified by the destination node to the protection path on its own side;

Or, the remote node itself detects a working path failure, and compares the priority of the working path that it detects the failure with the working path notified by the destination node, and then sends the receiving end of the working path with the highest priority to the The sender traffic is bridged to the protection path.

The pre-extended content of the protection switching command is included in the two-phase protection state coordination (2-phasePSC) protocol format.

The request flag bit used to indicate 1:N protection switching is: protection switching request (Reverserequest) flag bit;

The content indicating the specific working path is: working path number.

A linear 1:N protection device for a packet transmission network, the device is used as a remote node, including a 1:N protection switching unit and a communication unit; wherein,

The communication unit is configured to receive a message from the destination node performing a 1:N protection switching unit, and send it to the 1:N protection switching unit; and notify the destination node according to the triggering of the 1:N protection switching unit The specific protection switching situation;

The 1:N protection switching unit is used to bridge the traffic of the receiving end and the sending end of the working path corresponding to the above notification received on the side of the node to which it belongs to the protection path, and notify the communication unit of the situation .

It further includes a fault detection unit, which is used to detect the status of the working path of an instance of the node to which it belongs, and notify the 1:N protection switching unit when a working path fault is detected;

The 1:N protection switching unit is further used to compare the priority of the working path corresponding to the notification of the fault detection unit and the working path corresponding to the message from the destination node, and set the highest priority on the side of the node to which it belongs. Both the receiving end and the sending end traffic of the working path are bridged to the protection path.

The communication unit is provided with pre-extended request flags for indicating 1:N protection switching and protection switching command content indicating a specific working path, which is included in the 2-phasePSC protocol format;

The request flag used to indicate the 1:N protection switching is: Reverserequest flag; the content indicating the specific working path is: working path number.

A linear 1:N protection device for a packet transmission network, as a destination node, the device includes a fault detection unit, a 1:N protection switching unit, and a communication unit; wherein,

The failure detection unit is configured to detect the status of the working path on the side of the node to which it belongs, and notify the communication unit when a working path failure is detected;

The communication unit is used to send the fault condition of the working path from the fault detection unit to the remote node; also receive a message from the remote node indicating to perform 1:N protection switching, and send the message to the 1:N protection switching unit; and notifying the remote node of the completion of protection switching from the 1:N protection switching unit;

The 1:N protection switching unit is used to bridge the receiving end and the sending end traffic of the working path corresponding to the received message indicating 1:N protection switching to the protection path on the side of the node to which it belongs, Then notify the communication unit of the fact that the protection switching is completed.

The communication unit is provided with pre-extended request flags for indicating 1:N protection switching and protection switching command content indicating a specific working path, which is included in the 2-phasePSC protocol format;

The request flag used to indicate the 1:N protection switching is: Reverserequest flag; the content indicating the specific working path is: working path number.

A linear 1:N protection system for a packet transmission network, the system includes a remote node and a destination node; wherein,

The remote node is used to notify the 1:N protection switching according to the working path detected by itself and the instruction from the destination node, determine the working path to be 1:N protection switching and perform the protection switching, and also notify the destination node The node executes the working path of the protection switching;

The destination node is used to notify the remote node to perform 1:N protection switching for the working path after detecting that the working path fails; and according to the notification from the remote node, the remote node has performed protection switching 1:N protection switching is performed on the working path.

The system is provided with a pre-expanded request flag bit for indicating 1:N protection switching, and a protection switching command content indicating a specific working path, and the content is included in the 2-phasePSC protocol format;

The request flag used to indicate the 1:N protection switching is: the protection switching request Reverserequest flag; the content indicating the specific working path is: the number of the working path.

It can be seen that the linear 1:N protection method, device and system of the packet transmission network of the present invention can expand the content of the protection switching command, add the 1:N protection switching request flag bit, and the number of the working path; the destination node detects that the working path fails Finally, notify the remote node to perform 1:N protection switching for the working path; the remote node determines the working path to perform 1:N protection switching and performs protection switching according to the working path conditions detected by itself and the notification from the destination node , notifying the destination node of the working path on which the protection switching has been performed; the destination node performs 1:N protection switching on the working path on which the remote node has performed protection switching according to the notification from the remote node. Therefore, the linear 1:N protection of the packet transmission network can be realized smoothly.

Description of drawings

Fig. 1 is the schematic diagram of the 1-phasePSC protocol format of prior art;

Fig. 2 is the schematic diagram of 2-phasePSC protocol format of the present invention;

FIG. 3 is a schematic diagram of 1:N protection switching according to Embodiment 1 of the present invention;

FIG. 4 is a schematic diagram of 1:N protection switching in Embodiment 2 of the present invention;

Fig. 5 is a schematic diagram of the 1:N protection switching process of the present invention;

Fig. 6 is a diagram of the 1:N protection switching device of the present invention.

detailed description

Referring to FIG. 1 , FIG. 1 is a schematic diagram of a format of a 1-phase protection state coordination (Protection state coordination, PSC) protocol in the prior art. The 1-phasePSC protocol format shown in Figure 1 includes the following:

(1) Ver is the version of the 1-phasePSC protocol, usually set to 0;

(2) The request (Request) flag is used to indicate the command request for protection switching. The currently defined commands are as follows:

(1111) Clear clear;

(1110) Lockout protection protection lock;

(1101) Forcedswitch forced switching;

(0110) Signalfault signal failure;

(0101) Signaldegrade signal degradation;

(0100) Manualswitch manual switching;

(0011) Waittorestore waits for recovery;

(0010) Donotrevert (DNR) non-reversal;

(0000) Norequest empty request;

(3) Typ is the type of protection switching, and the currently defined types are as follows:

11: 1+1bidirectionalswitching1+1 bidirectional protection switching;

10:1:1bidirectional switching1:1 bidirectional protection switching;

01: 1+1unidirectionalswitching1+1 unidirectional protection switching;

00:1:1 unidirectional switching1:1 unidirectional protection switching;

(4) FPath and Path indicate the traffic conditions on the failed path and the currently activated path respectively:

Fpath: When the value is 0, it indicates that the protection path is faulty; when the value is 1, it indicates that the working path is faulty, and other flag bits are reserved.

Path: When the value is 0, it indicates that the traffic is currently passing on the working path; when the value is 1, it indicates that the traffic is currently passing on the protection path, and the rest of the flag bits are reserved.

(5) Reserved is a reserved flag, to be used for expansion.

In practical applications, the content of the protection switching command can be extended, such as adding a 1:N protection switching request flag and a working path number, so that the extended protection switching command can provide technical support for the 1:N protection switching. Specifically, the extension of the content of the protection switching command can be realized by extending the automatic protection switching protocol (Automatic Protection Protocol, APS), PSC and other protocol formats. FIG. 2 shows an extension method by taking PSC as an example.

Referring to FIG. 2, FIG. 2 is a schematic diagram of the format of the 1-phasePSC protocol of the present invention, and FIG. 2 defines a 2-phasePSC protocol for 1:N protection switching based on the content shown in FIG. 1. The specific extensions are as follows:

(1) A new Request flag is defined at the Request flag:

(0001) Reverserequest protects a command for switching requests, requesting recovery;

You can set the priority for the Reverserequest command, for example: set the priority of the Reverserequest command to be higher than Donotrevert but lower than Waittorestore. If a node receives two or more protection switching request commands at the same time, the protection switching request command with the highest priority is valid.

(2) The 10 and 00 flags of the original protection type are two-way and one-way 1:1 protection switching respectively. Now this definition needs to be slightly expanded, and the meaning is expanded to two-way and one-way 1:N protection switching;

(3) Use the Reserved byte to define a 4-bit path number (pathnumber, PN) flag for numbering the path. If it is extended 4bits, then a protection path can protect up to 14 working paths; if one protection path needs to protect more working paths, you can define more bits of PN flags, here is just 4bits as an example, But not limited to 4bits.

Specifically, a value of 0 is used to identify a protection path, a value of 1 to 14 is used to identify a working path, and a value of 15 indicates that there is an additional service in the current protection channel. The size of the path number indicates the priority of protection switching for the path; under the same circumstances, the smaller the path number, the higher the priority. That is: if a signal failure occurs on working path 1 and working path 2 at the same time, working path 1 will be protected first.

When applying the above extended structure for 1:N protection switching, the first and last nodes of the path can complete the 1:N protection switching action through only two signaling interactions (not included in the Norequest request), so multiple tasks can be processed efficiently In case of path failures at the same time, 1:N protection and recovery of data packet services are realized. The basic idea of 1:N protection switching is as follows:

After the destination node detects a fault in the working path (this fault can be signal failure or signal degradation), it sends a PSC message for protection switching to the remote node; which can carry the cause of the fault, the failed working path and Information such as the traffic condition on the currently activated path, the number of the failed working path, etc.

The remote node receives the protection switching command from the destination node, and determines the working path for 1:N protection switching in combination with the working path conditions detected by itself. For example, when the remote node only receives a protection switching command from the destination node, the remote node determines to perform 1:N protection switching on the working path corresponding to the protection switching command; When the protection switching command of the destination node detects that the working path on its own side is faulty, the remote node can compare the working path corresponding to the received protection switching command with the priority of the working path that has failed on its own side, and Make sure to perform 1:N protection switching on the working path with the highest priority.

Afterwards, the remote node performs a protection switching action on the working path that has been determined to undergo 1:N protection switching, and then sends a ReverseRequest command to the destination node, which carries the traffic conditions on the failed working path and the currently activated path, and has been completed. Information such as the serial number of the working path for protection switching.

The destination node receives the ReverseRequest command from the remote node, and performs protection switching on the working path corresponding to the command on its own side; then sends a NoRequest message to the remote node, which contains the failed working path and the currently activated path information such as the traffic conditions on the network, the number of the working path that has completed the protection switching, and so on.

When performing 1:N protection switching based on the above basic idea, the specific operation process can be shown in Figures 3 and 4.

Referring to FIG. 3 , FIG. 3 is a schematic diagram of 1:N protection switching according to Embodiment 1 of the present invention. In FIG. 3 , a 1:N protection group is configured between node A (NEA) and node B (NEB), so that one protection path can be used to protect N working paths. NEA and NEB are the common start and end nodes of the N+1 paths, and they can be directly connected, or span multiple nodes in the middle.

Generally speaking, the above N+1 paths belong to different Shared Risk Link Groups (SRLGs), for example, they are in different optical fibers. In this way, only one path will be affected when an optical fiber cut accident occurs, instead of It will cause N+1 paths to be unusable. The protection trail is numbered 0, and the working trails are numbered from 1 to N in sequence. When a signal failure occurs on working path 1 from NEA to NEB at a certain moment, the 1:N protection switching process is as follows:

The NEB detects the signal failure through the CV (connectivity verification) OAM running on the working path 1. Specifically, since the sending frequency of CV used for protection switching is generally 3.3ms, if three CV messages sent from NEA to NEB cannot be received, NEB will consider that there is a signal failure in its upstream, so NEB can Link signal failure is detected within 10ms. The NEB sends a PSC message with the command SF (signalfault) to the NEA, wherein Fpath=01 indicates that a signal failure occurs on the working path, path=00 indicates that traffic is currently being transmitted on the working path, and PN=01 indicates that a signal failure occurs on the working path 1.

After the NEA receives the PSC message from the NEB, it bridges the traffic of the receiving end and the sending end of the working path 1 to the protection path on its own side, and then sends a PSC message with the command RR (ReverseRequest) to the NEB. Fpath=01 in the PSC message indicates that the working path has a signal failure, path=01 indicates that the traffic has been bridged to the protection path at the NEA end, and PN=01 indicates that the working path bridged to the protection path at the NEA end is working path 1 .

After the NEB receives the ReverseRequest from the NEA, it bridges the traffic of the receiving end and the sending end of the working path 1 to the protection path on its own side, and then sends a PSC message with the command empty request NR (Norequest) to the NEA. Fpath=01 in the message indicates that the working path has a signal failure, path=01 indicates that the traffic has been bridged to the protection path at the NEB end, and PN=01 indicates that the working path bridged to the protection path at the NEB end is working path 1.

Referring to FIG. 4, FIG. 4 is a schematic diagram of 1:N protection switching according to Embodiment 2 of the present invention. In Figure 4, a 1:N protection group is configured between NEA and NEB, so that one protection path can be used to protect N working paths. NEA and NEB are the common start and end nodes of the N+1 paths, and they can be directly connected, or span multiple nodes in the middle. In general, N+1 paths belong to different SRLGs. The number of the protection path is 0, and the numbers of the working paths are sequentially from 1 to N; and, at time t1, a signal failure occurs on the working path 2 in the direction from NEB to NEA.

In this case, NEA detects the signal failure through CVOAM, and then sends a PSC message with the command SF. Fpath=01 in the PSC message indicates that the signal failure occurs on the working path, and path=00 indicates that the traffic is currently being transmitted on the working path. , PN=10 indicates that signal failure occurs in the working path 2.

When the NEB receives the PSC packet from the NEA with the command signalfault, the NEB detects that the signal failure also occurs in the direction from the NEA to the NEB on working path 1. At this time, the NEB compares the priorities of working path 1 and working path 2, determines that working path 1 has the highest priority, and then bridges the traffic of working path 1 to the protection path on its own side. Afterwards, NEB sends a PSC message with the command ReverseRequest to NEA. Fpath=1 in the PSC message indicates that the working path is faulty. The working path connecting the end bridge to the protection path is working path 1.

After the NEA receives the ReverseRequest from the NEB, it bridges the traffic of the receiving end and the sending end of the working path 1 to the protection path on its own side, and then sends a PSC message with the command Norequest to the NEB. In the PSC message, Fpath= 01 indicates that the working path has a signal failure, path=01 indicates that the traffic has been bridged to the protection path at the NEA end, and PN=01 indicates that the working path bridged to the protection path at the NEA end is working path 1.

It can be seen from the above description that the operation process in Fig. 3 and Fig. 4 can be simplified as shown in Fig. 5 . Referring to Fig. 5, Fig. 5 is a schematic diagram of the 1:N protection switching process of the present invention, and the process includes the following steps:

Step 510: expand the content of the protection switching command, and add ReverseRequest and working path number required by the 1:N protection switching request.

Step 520: After the destination node detects that the working path fails, it notifies the remote node to perform 1:N protection switching for the working path.

Step 530: The remote node determines the working path to perform 1:N protection switching according to the working path detected by itself and the notification from the destination node, executes the protection switching, and notifies the destination node that the protection switching has been performed on the working path .

Step 540: According to the notification from the remote node, the destination node performs 1:N protection switching on the working path on which the remote node has performed protection switching.

In order to smoothly realize the 1:N protection switching operation in each of the above figures, settings as shown in FIG. 6 can be performed. Referring to Fig. 6, Fig. 6 is a diagram of a 1:N protection switching device of the present invention; as an NE, the device includes a connected fault detection unit, a 1:N protection switching unit, and a communication unit; these functional entities can be connected sequentially or in pairs , as long as they can interact normally to realize 1:N protection switching smoothly. Moreover, the communication unit is provided with a protection switching command format that has realized content expansion, so operations such as encapsulation, analysis, and transmission of communication content can be performed during normal communication.

In specific applications, when the above-mentioned NE is used as a remote node, the communication unit in it can receive the PSC message of the protection switching command (such as signalfault) from the destination node, and send the received PSC message to the 1:N protection Switching unit, the 1:N protection switching unit bridges the traffic of the receiving end and the sending end of the working path corresponding to the above-mentioned PSC message received on the side of the node to which it belongs to the protection path, and notifies the communication of the situation unit. The communication unit sends a PSC message whose command is ReverseRequest to the destination node according to the notification of the 1:N protection switching unit, so as to notify the destination node of the specific protection switching situation.

It should be noted that the fault detection unit can detect the status of the working path on the side of the node to which it belongs, and notify the 1:N protection switching unit when detecting a fault in the working path. If the working path corresponding to the notification of the fault detection unit is different from the working path corresponding to the above-mentioned PSC message from the destination node, the 1:N protection switching unit needs to compare the priorities of the two working paths , and bridge the traffic of the receiving end and the sending end of the working path with the highest priority to the protection path on the side of the node to which it belongs, and then apply the aforementioned method to notify the destination node of the situation through the communication unit.

In addition, when the above-mentioned NE is used as the destination node, the fault detection unit can detect the status of the working path on the side of the node to which it belongs, and notify the communication unit when it detects that there is a working path, and the communication unit sends the situation in the form of a PSC message sent to the remote node. Moreover, the communication unit can also receive the PSC message whose command is ReverseRequest from the remote node, and send the PSC message to the 1:N protection switching unit, and the 1:N protection switching unit will transfer the above-mentioned Both the receiving end and the sending end traffic of the working path corresponding to the PSC message are bridged to the protection path, and then the communication unit is notified of the completion of the protection switching, and the communication unit sends a PSC message with the command Norequest to the remote node , to notify the remote node that the protection switching has been completed.

To sum up, it can be seen that the linear 1:N protection technology of the packet transmission network of the present invention can successfully realize the linear 1:N protection of the packet transmission network no matter it is a method, a device embodied by a node, or a system including a node.

The above description is only a preferred embodiment of the present invention, and is not used to limit the protection scope of the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the within the protection scope of the present invention.

Claims (12)

1. A linear 1:N protection method for a packet transmission network, characterized in that the method comprises: After the destination node detects that the working path fails, it notifies the remote node to perform 1:N protection switching for the working path; The remote node determines the working path to perform 1:N protection switching according to the working path situation detected by itself and the notification from the destination node and executes the protection switching and notifies the destination node that the working path of the protection switching has been executed; the determination To perform 1:N protection switching on the working path and perform protection switching includes: the remote node itself detects the working path failure, and compares the priority of the working path detected by itself with the working path notified by the destination node, and then One side bridges both the receiving end and the sending end traffic of the working path with the highest priority to the protection path; The destination node performs 1:N protection switching on the working path on which the remote node has performed protection switching according to the notification from the remote node. 2. The method according to claim 1, further comprising: The request for indicating 1:N protection switching and the content of the protection switching command indicating a specific working path are expanded in advance. 3. The method according to claim 2, wherein the method for the remote node to determine the working path for the 1:N protection switching is: The remote node itself does not detect the failure of the working path, and bridges the traffic of the receiving end and the sending end of the working path notified by the destination node to the protection path on its own side. 4. The method according to claim 2 or 3, characterized in that the pre-extended content of the protection switching command is contained in a two-phase protection state coordination 2-phasePSC protocol format. 5. The method of claim 4, wherein, The request flag bit used to indicate 1:N protection switching is: the protection switching request Reverserequest flag bit; The content indicating the specific working path is: working path number. 6. A linear 1:N protection device for a packet transmission network, characterized in that, as a remote node, the device includes a 1:N protection switching unit and a communication unit; wherein, The communication unit is configured to receive a message from the destination node for the 1:N protection switching unit, and send it to the 1:N protection switching unit; and notify the destination node according to the triggering of the 1:N protection switching unit The specific protection switching situation; The 1:N protection switching unit is used to bridge the traffic of the receiving end and the sending end of the working path corresponding to the notification received above to the protection path on the side of the node to which it belongs, and notify the communication unit of the situation bridging the traffic of the receiving end and the sending end of the working path corresponding to the above-mentioned notification received to the protection path includes: comparing the priority of the working path that has detected a fault with the priority of the working path notified by the destination node, and then On its own side, both the receiving end and the sending end traffic of the working path with the highest priority are bridged to the protection path. 7. The device according to claim 6, further comprising a fault detection unit, configured to detect the state of the working path on the side of the node to which it belongs, and notify the 1:N protection when a fault is detected in the working path Switch unit. 8. The device according to claim 6 or 7, wherein the communication unit is provided with a pre-extended request flag bit for indicating 1:N protection switching, and a protection switching command content indicating a specific working path , the content is included in the 2-phasePSC protocol format; The request flag used to indicate the 1:N protection switching is: Reverserequest flag; the content indicating the specific working path is: working path number. 9. A linear 1:N protection device for a packet transmission network, characterized in that, as a destination node, the device includes a fault detection unit, a 1:N protection switching unit, and a communication unit; wherein, The failure detection unit is configured to detect the status of the working path on the side of the node to which it belongs, and notify the communication unit when a working path failure is detected; The communication unit is used to send the fault condition of the working path from the fault detection unit to the remote node; it also receives a message from the remote node indicating 1:N protection switching, and sends the message to the 1:N protection switching unit; and notifying the remote node of the completion of protection switching from the 1:N protection switching unit; The 1:N protection switching unit is used to bridge the traffic of the receiving end and the sending end of the working path corresponding to the received message indicating 1:N protection switching to the protection path on the side of the node to which it belongs, Then notify the communication unit of the completion of the protection switching; the working path corresponding to the 1:N protection switching message is: the remote node compares the working path notified by the destination node with the remote The priority of the faulty working path detected by the end node itself, and the determined working path with the highest priority. 10. The device according to claim 9, wherein the communication unit is provided with a pre-extended request flag bit for indicating 1:N protection switching, and a protection switching command content indicating a specific working path, the The content is included in the 2-phasePSC protocol format; The request flag used to indicate the 1:N protection switching is: Reverserequest flag; the content indicating the specific working path is: working path number. 11. A linear 1:N protection system for a packet transmission network, characterized in that the system includes a remote node and a destination node; wherein, The remote node is used to notify the 1:N protection switching according to the working path detected by itself and the instruction from the destination node, determine the working path to be 1:N protection switching and perform the protection switching, and also notify the destination node The node has executed the working path of the protection switching; the determining the working path to perform 1:N protection switching and performing the protection switching includes: comparing the priority of the working path detected by itself with the working path notified by the destination node, Then, on its own side, both the receiving end and the sending end traffic of the working path with the highest priority are bridged to the protection path; The destination node is used to notify the remote node to perform 1:N protection switching for the working path after detecting that the working path fails; and according to the notification from the remote node, the remote node has performed protection switching 1:N protection switching is performed on the working path. 12. The system according to claim 11, characterized in that, the system is provided with a pre-extended request flag bit for indicating 1:N protection switching, and a protection switching command content indicating a specific working path, the content includes In the 2-phasePSC protocol format; The request flag used to indicate the 1:N protection switching is: the protection switching request Reverserequest flag; the content indicating the specific working path is: the number of the working path.