WO2017206785A1

WO2017206785A1 - Network element, protection switching method and system, and storage medium

Info

Publication number: WO2017206785A1
Application number: PCT/CN2017/085846
Authority: WO
Inventors: 周晓慧
Original assignee: 中兴通讯股份有限公司
Priority date: 2016-06-02
Filing date: 2017-05-25
Publication date: 2017-12-07
Also published as: CN107465527A; CN107465527B

Abstract

Provided are a protection switching method, device and system, and a storage medium. The method comprises: when a head node network element is configured with a detection mechanism on a first user side interface thereof, sending, by means of the first user side interface thereof, a first detection message to a main tail node network element, configured with the same detection mechanism, at an opposite end of a working link; the head node network element monitoring the situation where the main tail node network element feeds back a first detection response message, wherein the first detection response message is fed back by the main tail node network element to the head node network element by means of a second user side interface thereof; and when the head node network element determines that the working link is abnormal according to a monitoring result, switching a service on the working link to a protection link.

Description

Network element, protection switching method and system thereof, storage medium

Cross-reference to related applications

The present application is filed on the basis of the Chinese Patent Application No. PCT Application No. .

Technical field

The present invention relates to the field of communications technologies, and in particular, to a network element, a protection switching method, a system thereof, and a storage medium.

Background technique

The Packet Transport Network (PTN) technology is essentially a packet-based routing architecture that provides multi-service technical support. It is a technology that is more suitable for Internet Protocol (IP) service transmission. It inherits the traditional advantages of optical transmission, including good network scalability, rich operation and maintenance, fast protection switching and clock. Transmission capability, high reliability and security, network management concept, end-to-end service configuration and precise alarm management. These advantages of PTN are unmatched by traditional routers and enhanced Ethernet technologies, so the use of PTN networks is becoming more and more abundant in real life.

In the traditional PTN network, the path detection protection mechanism for the service layer includes Pseudo Wire (PW) protection and Virtual Private Network Fast Reroute (VPN FRR) protection. Please refer to FIG. 1 , which is a networking diagram of PW protection or VPN FRR protection in the prior art, where the user side interface of the device 1 is connected to the base station, and the network side interface is connected to the network side interface of the device 2, and the device 2 The user side interface is connected to the base station controller (Radio Network Controller, RNC), and the chain between the device 1 and the device 2 The road acts as a working link and is used to carry services at the service layer. In addition, the device 1 is also connected to the network side interface of the device 3 through another network side interface, and the user side interface of the device 3 is also connected to the RNC. The link between the device 1 and the device 3 serves as a protection link when the working link When a fault occurs, you can switch the service to the protection link to ensure the normal operation of the service. As shown in FIG. 1 , the mechanism for detecting the fault of the PTN network in the prior art can only cover the link between the network side interface of the device 1 and the network side interface of the device 2, and the detection mode is The device sends a detection data packet through the network side interface connected to the device 2, and the device 2 receives the detection data packet through the network side interface, and sends a detection feedback message to the network side interface of the device 1 through the network side interface. In addition, in the existing protection mechanism, it is also possible to detect whether there is a physical fault on the user-side interface of the device 1 of the device 1, for example, if the interface is in the down state, it can be detected. However, the actual situation is that the user-side interface often has an interface whose status is up but cannot forward the service normally. The process of detecting according to the above example can be known. In the prior art, the detection between the device 1 and the device 2 can only cover the forwarding status between the network side interfaces, but cannot cover the forwarding status of the user side interface. .

In summary, in the prior art, since the forwarding status of the user-side interface of the head node network element and the tail node network element cannot be detected, only the link status including the network side interface can be detected. Therefore, when the user-side interface of the head node network element and the tail node network element is abnormally forwarded, it cannot be detected, and thus the service on the working link is not switched, which seriously affects the normal forwarding of the service and reduces the user experience.

Summary of the invention

The network element, the protection switching method, the system, and the storage medium provided by the embodiments of the present invention can solve the problem that the service link on the working link does not occur when the user-side interface of the head node network element and the tail node network element is abnormally forwarded. Switching occurs, which seriously affects the normal forwarding of services.

In one aspect, an embodiment of the present invention provides a protection switching method, including:

The head node network element is configured with a detection mechanism on the first user side interface thereof, by using the first user The side interface sends a first detection packet to the primary tail node network element configured with the detection mechanism to the opposite end of the working link;

The head node network element monitors a situation in which the primary tail node network element feeds back a first detection response message; the first detection response message is sent by the primary tail node to the head through its second user side interface Node network element feedback;

The head node network element switches the service on the working link to the protection link when the working link is abnormal according to the monitoring result.

On the other hand, an embodiment of the present invention further provides a network element, including:

a first detection packet sending unit, configured to: the head node network element is configured with a detection mechanism on the interface of the first user side, and the detection mechanism is configured on the opposite end of the working link by using the first user side interface The primary tail node network element sends the first detection packet;

a monitoring unit, configured to monitor a situation in which the primary tail node network element feeds back a first detection response message; the first detection response message is sent by the primary tail node to the head node through its second user side interface Network element feedback;

The switching unit is configured to switch the service on the working link to the protection link when the working link is abnormal according to the monitoring result.

In another aspect, the embodiment of the present invention further provides a protection switching system, including: a head node network element and a main tail node network element;

A detection mechanism is configured on the network element of the head node and the network element of the main tail node, where the network element of the head node is configured by the first user-side interface to the opposite end of the working link. The network element of the tail node sends the first detection packet, and monitors the situation of the feedback response packet of the network element of the main tail node, and determines the service on the working link when the working link is abnormal according to the monitoring result. Switch to the protection link;

The primary tail node network element feeds back the first detection response message to the head node network element by using the second user side interface according to the first detection packet.

In still another aspect, an embodiment of the present invention provides a computer storage medium having stored therein computer executable instructions for performing the protection switching method described above.

In still another aspect, an embodiment of the present invention provides a network element including a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the program to implement the following steps:

The first user-side interface is configured with a detection mechanism, and the first user-side interface sends a first detection packet to the primary tail node network element configured with the detection mechanism on the opposite end of the working link;

Monitoring the situation that the primary tail node network element feeds back the first detection response packet, where the first detection response packet is fed back by the primary tail node to the head node network element through its second user side interface;

When the working link is abnormal according to the monitoring result, the service on the working link is switched to the protection link.

The beneficial effects of the embodiments of the present invention are:

According to the network element, the protection switching method, the system thereof, and the storage medium provided by the embodiment of the present invention, the head node network element is configured with a detection mechanism on the interface of the first user side, and the working link is provided through the first user side interface of the first user side interface. The primary end node network element configured with the same detection mechanism is configured to send the first detection packet, and the head node network element monitors the situation that the primary tail node network element feeds back the first detection response message; the first detection response message is received by the primary The tail node feeds back to the head node network element through its second user-side interface. When the head node network element determines that the working link is abnormal according to the monitoring result, the service on the working link is switched to the protection link. In the above manner, the user side interface of the network element of the active link head node and the user side interface of the main tail node network element may be detected. The user side interface of the head node network element is not directly connected to the working link tail node network element. Therefore, when the first detection packet is sent to the primary tail node network element through the first user side interface, the network side interface and the network side interface of the working link are also passed; the primary tail node network element receives the first After detecting the message, The first detection response message is also fed back to the head node network element by using its own second network side interface according to the similar transmission mode. In summary, the entire detection process covers the first user side interface of the head node network element and the second user side interface of the main tail node network element, and detects the network side interface of the head node network element and the main tail node network element. The forwarding status also detects the forwarding status of the user-side interface. And when it is detected that the service cannot be forwarded normally, that is, when the link is abnormal, the service on the working link is switched to the protection link, so that the service can be forwarded. When the user-side interface of the head node network element and the tail node network element in the prior art is abnormally forwarded, the service on the working link is not switched, which seriously affects the normal forwarding of the service and reduces the user experience. Achieve more comprehensive detection of working link abnormal conditions, provide protection measures, and improve the user experience.

DRAWINGS

Figure 1 is a set of network diagrams;

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

3 is a flowchart of a protection switching method according to an embodiment of the present invention;

4 is a schematic structural diagram of a protection switching apparatus according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a protection switching system according to an embodiment of the present invention.

detailed description

This embodiment provides a protection switching method. Referring to FIG. 2, the method includes:

S201: The head node network element is configured with a detection mechanism on the interface of the first user side, and sends a first detection packet to the primary tail node network element configured with the detection mechanism by the first user side interface;

S202: The head node network element monitors, by the main tail node network element, the first detection response message.

S203: The head node network element switches the service on the working link to the protection link when the working link is abnormal according to the monitoring result.

In this embodiment, the foregoing steps are performed, and the detection mechanism is required. Therefore, before the steps S201 to S203 are performed, a detection mechanism is configured for each network element on the working link, and the network side interface or the user side interface is configured. Detection mechanism. The head node network element performs step S201 to send a first detection message to the primary tail node network element through its first user side interface, and the main tail node network element also configures the same detection mechanism as the head node network element. The first user-side interface of the head node network element is used to connect to the user equipment, and is connected to the network side interface of the main tail node network element through its own network side interface. Of course, between the head node network element and the main tail node, There are also other intermediate network elements, and the second user-side interface of the primary tail node network element is connected to the user equipment. In step S201, the head node network element generates a first detection packet, which is first sent to its own network side interface through its first user-side interface; and then the first detection packet is passed through its own network-side interface. The working link is sent to the network side interface of the primary tail node network element. In this way, if any of the first user-side interface of the head node network element and its own network-side interface cannot be forwarded normally, the first detection packet cannot reach the primary tail node network element smoothly, and if it is working If the link itself is abnormal, the first detection packet cannot reach the primary tail node network element smoothly.

In step S202, the head node network element monitors the situation in which the main tail node feeds back the first detection response message. The first detection response message is feedback from the main tail node network element to the head node network element by using the second network side interface of the main tail node.

The head node network element performs step S203, and according to the situation that the monitored main tail node feeds back the first detection response message, and determines that the working link is abnormal, the service on the working link is switched to the protection link. The protection link is also a backup link. It is configured in advance. When the working link is unavailable, it is used for service transmission to avoid links that cause service failure. As for how to determine whether the working link is faulty, the following methods can be used; when configuring the detection mechanism, the alarm conditions are also configured together (may not be configured together, as long as they are configured before the formal work), the head node network element The alarm condition is determined according to the detection result. If the alarm condition is reached, the link is abnormal. The abnormality may be the first user-side interface and the network-side interface of the head node network element. The second user-side interface and the network-side interface of the primary-end node cannot be forwarded normally. The intermediate working link may be faulty. If other intermediate network elements are in the middle, they may also be interfaces of the intermediate network element. There are forwarding issues and so on. The alarm condition may be set according to a packet loss rate or a transmission delay of the first detection packet, or may be set according to both. For example, the alarm condition may include any one of the following modes: mode 1, if the packet loss rate of the first detection packet is higher than the first packet loss threshold, determining that the working link is abnormal; If the transmission delay of the detection response packet is higher than the first delay threshold, it is determined that the working link has an abnormality. Therefore, the head node network element needs to count whether the packet loss rate of the first detection packet is higher than the first packet loss rate threshold. If yes, it is determined that the working link is abnormal. Otherwise, it is determined that there is no abnormality; The value of the transmission delay of the first detection response packet is higher than the first delay threshold. If yes, the working link is abnormal. Otherwise, there is no abnormality. The first packet loss rate threshold and the first delay threshold may be flexibly set according to different usage scenarios.

In an implementation manner of this embodiment, before performing the handover of the service in step S203, the protection link is also detected to determine whether there is an abnormality, and the protection link does not have an abnormality. The service switches to the protection link. For the abnormal condition detection of the protection link, the method in the prior art can be used, for example, the bidirectional forwarding detection (BFD) protocol is used for detection. In this manner, the first user of the head node network element cannot be detected. Forwarding of the third user-side interface of the side interface and the tail-side node. Therefore, the abnormality of the protection link can also be detected in the following manner. When the first user-side interface is configured with the detection mechanism, the head node network element is configured with a detection mechanism on the opposite end of the protection link through the first user-side interface. The trailing node network element sends a second detection message; and monitors the situation in which the tail end node network element feeds back the second detection response message; the second detection response message is sent by the backup tail node through its third user side interface The head node network element feedback; the head node network element determines whether the protection link is abnormal according to the monitoring result. The manner in which the head node network element determines whether the protection link is abnormal according to the monitoring result may also be implemented in a similar manner as the above setting alarm condition. For example, the head section The point network element also counts whether the packet loss rate of the second detection packet is higher than the second packet loss rate threshold. If yes, the protection link is abnormal. Otherwise, there is no abnormality; and the second detection response packet is statistically received. Whether the transmission delay is higher than the second delay threshold. If yes, the protection link is abnormal. Otherwise, there is no abnormality. The second packet loss rate threshold and the second time delay threshold may be equal to the first packet loss rate threshold and the first delay threshold, respectively, or may be unequal, and the second packet loss rate threshold and the second time may be flexibly set according to requirements. The specific value of the threshold is extended.

In an implementation manner, when the head node network element detects that an abnormality occurs on the working link, an alarm is generated to notify the staff, so that the staff can timely handle the fault. After the head node NE successfully switches the service from the working link to the protection link, it will continue to detect the abnormal condition of the working link, because when the staff knows that the working link is faulty, the fault may be processed in time, and the working link is completed. When the network element of the head node detects that the working link does not exist abnormally, the service working on the protection link is automatically switched back to the working link. No need for staff to manually configure and complete the switch. In an embodiment, the head node network element periodically performs the above steps S201 to S203, and may also set the period to be less than the PW BFD detection period.

The protection switching method in this embodiment can be used in multiple networks, for example, can be used for PTN, and can also be used for Next Generation Network (NGN) and the like. The detection mechanism for each network element configured on the working link or the protection link in this embodiment may be an A Two-way Active Measurement Protocol (TWAMP) protocol, a first detection packet, and a second detection. The packet is a bidirectional active measurement packet generated by the network element of the head node; the first detection response message is a bidirectional active measurement feedback message generated by the network element of the tail end node, and the second detection response message is generated by the network element of the standby tail node. Two-way active measurement feedback message.

With the protection switching method in this embodiment, firstly, the fault of the working link can be detected more comprehensively, and the fault detection range is widely covered. Secondly, the fault of the protection link is also detected, and only when the protection link is normal. Business switching, so as to avoid useless switching; in addition, when a fault is detected, an alarm is generated, the staff is notified, and the automatic switchback function is set to reduce the work. The work of the staff makes the business switching more automated and more user-friendly.

This embodiment provides another protection switching method. Referring to FIG. 3, the method includes:

S301: The head node network element is configured with a detection mechanism on the interface of the first user side, and sends a first detection packet to the network element of the main tail node configured with the detection mechanism by the first user side interface.

S302: The primary tail node network element feeds back the first detection response message to the head node network element by using the second user side interface according to the first detection packet.

S303: The head node network element monitors the situation of the network element feedback detection response packet of the main tail node, and according to the monitoring result, when the working link is abnormal, the service on the working link is switched to the protection link.

Step S301 in this embodiment may refer to the execution step of step S201 in the embodiment. The detection mechanism is configured for each network element on the working link, and the detection mechanism is configured on both the network side interface and the user side interface. The first user-side interface of the head node network element is used to connect to the user equipment, and is connected to the network side interface of the main tail node network element through its own network side interface. Of course, between the head node network element and the main tail node, There are also other intermediate network elements, and the second user-side interface of the primary tail node network element is connected to the user equipment. In step S301, the head node network element generates a first detection packet, which is first sent to its own network side interface through its first user-side interface; and then passes the first detection packet from its own network-side interface. The working link is sent to the network side interface of the primary tail node network element.

After the above steps are completed, the detection mechanism is configured. The detection mechanism is configured for each network element on the working link. Therefore, the second user-side interface of the main tail node network element is also configured with the detection mechanism. In step S302, after receiving the first detection packet, the primary tail node network element knows that the head node network element needs to detect the working link status, and then generates a first detection response message by itself and passes its own The second user side interface feeds back the first detection response message to the head node network element. The path of the first detection response packet is the same as the path of the first detection packet sent by the network element of the head node, and the first detection response packet generated by the main tail node passes its second user. The side interface is connected to the network element of the network element of the head node by itself, and then reaches the network element of the head node through the working link and the network side interface of the head node network element. After performing steps S301 and S302, it is equivalent to completing the detection loop on the head node network element and the main tail node network element, and the interface of the head node network element and the main tail node network element participating in the transmission and the working link are abnormal. This loop cannot be completed normally, so in this way, the detection can be made more comprehensive.

For the execution process of step S303, the execution process of S203 in the embodiment may be referred to. In an implementation manner, when the head node network element detects that an abnormality occurs on the working link, an alarm is generated to notify the staff, so that the staff can timely handle the fault. After the head node NE successfully switches the service from the working link to the protection link, it will continue to detect the abnormal condition of the working link, because when the staff knows that the working link is faulty, the fault may be processed in time, and the working link is completed. When the network element of the head node detects that the working link does not exist abnormally, the service working on the protection link is automatically switched back to the working link. No need for staff to manually configure and complete the switch.

The protection switching method in this embodiment can be used in various networks, for example, it can be used for PTN, and can also be used for NGN and the like. The detection mechanism for each network element configured on the working link or the protection link in this embodiment may be the TWAMP protocol, and the first detection packet and the second detection packet are two-way active measurement packets generated by the head node network element. The first detection response message is a bidirectional active measurement feedback message generated by the network element of the tail end node, and the second detection response message is a bidirectional active measurement feedback message generated by the network element of the tail end node.

The protection switching method in this embodiment includes the actions performed by the head node network element and the actions performed by the primary tail node network element and the standby tail node network element. The execution actions of the primary tail node network element may refer to the execution flow in the embodiment.

This embodiment provides a network element. Referring to FIG. 4, the network element 4 can be configured as a head node network element. The network element 4 includes: a first detection packet sending unit 41, the first The detection packet sending unit 41 is configured to: when the network element 4 is configured with a detection mechanism on the first user side interface thereof, The first user-side interface sends the first detection packet to the primary tail node network element configured with the detection mechanism on the peer end of the working link. The protection switching device generates the first detection packet, and firstly sends the first detection packet to the network side interface through the first user side interface of the head node network element; and then sends the first detection packet from the network side interface to the network side interface through the working link. The network side interface of the primary tail node network element. In this way, if any one of the first user-side interface of the network element 4 and its own network-side interface cannot be forwarded normally, the first detection packet cannot reach the primary tail node network element smoothly, and if it is working If the link is abnormal, the first detection packet cannot reach the NE of the main tail node smoothly. Therefore, the entire working link can be completely and completely detected.

The network element 4 further includes a monitoring unit 42 configured to monitor the situation in which the primary tail node network element feeds back the first detection response message. The first detection response message is feedback from the main tail node to the network element 4 for the first detection message through its own second network side interface.

The network element 4 further includes a switching unit 43 configured to switch the service on the working link to the protection link when the working link is abnormal according to the monitoring result. The switching unit 43 determines whether the working link is abnormal due to whether the packet loss rate of the first detection packet is higher than the first packet loss rate threshold, or whether the transmission delay of the first detection response packet is high by statistics. Determining whether there is an abnormality in the working link according to the first delay threshold; or judging whether there is an abnormality in the working link according to the two criteria.

The network element 4 further includes a protection link abnormality detecting unit 44 configured to detect the protection link to determine whether there is an abnormality. When the protection link does not have an abnormality, the switching unit 43 switches the service to the protection chain. road. The protection link abnormality detecting unit 44 can adopt the method in the prior art, for example, using the BFD protocol for detection. In addition, the protection link abnormality detecting unit 44 may also detect the abnormal condition of the protection contact in the following manner, and the protection link abnormality detecting unit 44 configures the tail end of the detection mechanism to the opposite end of the protection link through the first user side interface. The node network element sends the second detection packet, and monitors the situation that the network element of the backup tail node feeds back the second detection response message; the second detection response message is sent by the backup tail node to the network element 4 through its third user-side interface. Feedback The protection link abnormality detecting unit 44 determines whether there is an abnormality in the protection link according to the monitoring result. The implementation manner of the protection link abnormality detecting unit 44 determining whether the protection link is abnormal according to the monitoring result may also be implemented in a similar manner as the above setting alarm condition. For example, the protection link abnormality detecting unit 44 also counts whether the packet loss rate of the second detection packet is higher than the second packet loss threshold. If yes, the protection link is abnormal. Otherwise, there is no abnormality; and the protection link The abnormality detecting unit 44 counts whether the transmission delay of the second detection response number packet is higher than the second delay threshold. If yes, the protection link has an abnormality. Otherwise, there is no abnormality.

In an embodiment, when detecting that an abnormality occurs on the working link, the network element 4 generates an alarm to notify the staff, so that the staff can timely handle the fault. After the NE successfully switches the service from the working link to the protection link, it will continue to detect the abnormal status of the working link. When the staff knows that the working link is faulty, the fault may be processed and the working link is restored. Normally, when the network element detects that there is no abnormality in the working link, it automatically switches the service working on the protection link back to the working link. No need for staff to manually configure and complete the switch.

The network element 4 in this embodiment may be used to implement the protection switching method in the embodiment. The network element 4 may be disposed on each network device, such as a router. The functions of the functional units of the network element 4, the first detection message sending unit 41, the monitoring unit 42, the switching unit 43, and the protection link abnormality detecting unit 44 may all be performed by the processor of the working link head node network element. achieve. For example, when the head node network element is a router connecting the base station or the PNC in the PTN network, that is, the network element 4 is a router, the first detection message sending unit 41, the monitoring unit 42, the switching unit 43, and the protection link of the router The function of the anomaly detection unit 44 can be implemented by the processor of the router.

The detection mechanism for each network element configured on the working link or the protection link in this embodiment may be the TWAMP protocol, and the first detection packet and the second detection packet are two-way active measurement packets generated by the head node network element. The first detection response message is a bidirectional active measurement feedback message generated by the network element of the tail end node, and the second detection response message is a bidirectional active measurement feedback report generated by the network element of the tail end node. Text.

The embodiment further provides another network element, where the network element can be configured as a primary tail node network element, including a primary detection packet receiving unit and a primary feedback unit, and the detection packet receiving unit is configured to receive the sending of the head node network element. The first detection packet is configured to generate a first detection response message, and send the first detection corresponding message to the head node network element.

The embodiment further provides another network element, where the network element can be configured as a network element of the standby tail node, and is configured to receive a packet receiving unit and a backup feedback unit, and the detecting packet receiving unit is configured to receive the sending of the head node network element. The first detection packet is configured to generate a first detection response message, and send the first detection corresponding message to the head node network element.

The embodiment further provides a protection switching system. Referring to FIG. 5, the protection switching system includes a head node network element 51 and a main tail node network element 52. The detection mechanism is configured on the head node network element and the main tail node network element. The head node network element 51 is configured with a detection mechanism on the interface of the first user side, and sends a first detection packet to the primary tail node network element 52 configured with the detection mechanism on the opposite end of the working link through the first user side interface. And monitoring the situation that the main tail node network element 52 feeds back the detection response message, and when the working link is abnormal according to the monitoring result, the service on the working link is switched to the protection link; the head node network element 51 can adopt the present The network element 4 in the embodiment is implemented.

The primary tail node network element 52 feeds back the first detection response message to the head node network element through its second user-side interface according to the first detection packet. After receiving the first detection packet, the main tail node network element 52 knows that the head node network element 51 needs to detect the working link status, and then generates a first detection response message and passes its own second user. The side interface feeds back the first detection response message to the head node network element 51. The path of the first detection response packet is the same as the path of the first detection packet sent by the head node network element 51, and the primary detection node network element 52 passes the first detection response message generated by itself to the second user side of the second detection side. The interface then connects to the head node network element 51 through the network side interface of the network element of the head node, and then through the working link and the network side interface of the head node network element.

The protection switching system in this embodiment will be described below by way of example. In the system, Referring to FIG. 1 in the networking mode of FIG. 1, the protection switching system includes a head node network element device 1, a main tail node network element device 2, a backup tail node network element device 3, and an RNC and a base station. The connection relationship between devices is shown in Figure 6. The link between device 1 and device 2 is a working link, and the link between device 1 and device 3 is a protection link.

Configure and enable TWAMP on Device 1, Device 2, and Device 3, set alarm conditions, and set the service to be switched from the working link to the protection link when an alarm is generated. The device 1 sends the first detection packet through the network side interface connected to the device 2, and the device 2 receives the first detection packet through the network side interface; the device 2 connects through the network itself. The user-side interface of the RNC sends a first detection response packet to the device 1 by connecting the network-side interface of the device 1. The device 1 determines whether there is an abnormality in the working link according to the condition that the first detection packet is received. For example, if the device 1 does not receive the first detection response packet sent by the device 2, the device 1 determines the first detection packet. The packet loss rate is 100%, so it is determined that there is an abnormality in the working link. Then, the device 1 detects whether there is an abnormality in the protection link, and the detection process is similar to the process of detecting whether the working link is abnormal. If it is detected that there is no abnormality in the protection link, the device 1 generates an alarm and switches the service to the protection link. When the worker repairs the abnormality of the working link, the device 1 switches the service back to the working link.

Each unit in the network element provided by the embodiment of the present invention may be implemented by a processor in the network element; of course, it may also be implemented by a logic circuit; in the process of implementation, the processor may be a central processing unit (Central Processing Unit, CPU), Micro Processor Unit (MPU), Digital Signal Processor (DSP) or Field Programmable Gate Array (FPGA).

It should be noted that, in the embodiment of the present invention, if the protection switching method described above is implemented in the form of a software function module and sold or used as a stand-alone product, it may also be stored in a computer readable storage medium. Based on such understanding, the technical solution of the embodiments of the present invention may be embodied in the form of a software product in essence or in a contribution to the prior art. The computer software product is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the methods described in various embodiments of the present invention. The foregoing storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read only memory (ROM), a magnetic disk, or an optical disk. Thus, embodiments of the invention are not limited to any specific combination of hardware and software.

Embodiments of the present invention provide a computer storage medium having stored therein computer executable instructions for performing the protection switching method described above.

Embodiments of the present invention provide a network element including a memory, a processor, and a computer program stored on the memory and operable on the processor, the processor implementing the program to implement the following steps:

Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored by a computing device in a storage medium (eg, ROM, diskette, optical disk) and, in some cases, The steps shown or described may be performed in an order different from that herein, or they may be separately fabricated into individual integrated circuit modules. Alternatively, multiple modules or steps of them can be implemented as a single integrated circuit module. Therefore, the invention is not limited to any particular combination of hardware and software.

The above is a further detailed description of the present invention in connection with the embodiments, and the invention is not limited to the description. It will be apparent to those skilled in the art that the present invention may be made without departing from the spirit and scope of the invention.

Industrial applicability

The technical solution provided by the embodiment of the present invention can effectively solve the problem that when the forwarding of the user-side interface of the head node network element and the tail node network element in the prior art is abnormal, the service on the working link is not switched, which seriously affects The service is forwarded normally, which reduces the user experience; achieves a more comprehensive detection of the abnormal link of the working link, provides protection measures, and improves the user experience.

Claims

A protection switching method includes:

The head node network element is configured with a detection mechanism on the interface of the first user side, and sends a first detection packet to the network element of the main tail node configured with the detection mechanism on the opposite end of the working link through the first user side interface;

The head node network element monitors a situation in which the primary tail node network element feeds back a first detection response message; the first detection response message is sent by the primary tail node to the head through its second user side interface Node network element feedback;

The head node network element switches the service on the working link to the protection link when the working link is abnormal according to the monitoring result.
The protection switching method of claim 1, wherein before the switching of the service on the working link to the protection link by the head node network element, the method further comprises: detecting whether the protection link is abnormal;

The switching of the service on the working link to the protection link by the network element of the head node includes: when the protection link does not have an abnormality, switching the service on the working link to the protection link.
The protection switching method according to claim 2, wherein the detecting, by the head node network element, whether the protection link has an abnormality comprises:

Detecting the protection link by using a bidirectional forwarding detection protocol, and determining whether the protection link is abnormal according to the detection result;

or

The head node network element sends a second detection packet to the network element of the tailing node configured with the detection mechanism at the opposite end of the protection link;

The head node network element monitors a situation in which the network element of the standby tail node feeds back a second detection response message; the second detection response message passes the third user side interface of the backup tail node through itself Feedback to the head node network element;

The head node network element determines, according to the monitoring result, whether the protection link is abnormal.
The protection switching method according to claim 3, wherein the protection link is determined to be abnormal according to the monitoring result by at least one of the following methods:

And determining whether the packet loss rate of the second detection packet is higher than the second packet loss threshold, and if yes, determining that the protection link is abnormal;

The transmission delay of the second detection response packet is higher than the second delay threshold. If yes, the working link is abnormal. Otherwise, there is no abnormality.
The protection switching method according to any one of claims 1 to 4, further comprising: the head node network element determining whether the working link is abnormal by at least one of the following manners;

The packet loss rate of the first detection packet is higher than the first packet loss threshold, and if yes, the working link is abnormal.

The transmission delay of the first detection response packet is higher than the first delay threshold. If yes, the working link is abnormal. Otherwise, there is no abnormality.
The protection switching method according to any one of claims 1 to 4, wherein the detection mechanism is a bidirectional active measurement protocol, and the first detection message is a bidirectional active measurement message generated by the head node network element; The first detection response message is a bidirectional active measurement feedback message generated by the primary tail node network element.
A network element, where the network element functions as a head node network element, includes:

a first detection packet sending unit, configured to: the head node network element is configured with a detection mechanism on the interface of the first user side, and the detection mechanism is configured on the opposite end of the working link by using the first user side interface The primary tail node network element sends the first detection packet;

a monitoring unit, configured to monitor a situation in which the primary tail node network element feeds back a first detection response message; the first detection response message is connected by the primary tail node through its second user side The mouth feeds back to the head node network element;

The switching unit is configured to switch the service on the working link to the protection link when the working link is abnormal according to the monitoring result.
The network element according to claim 7, further comprising: a protection link abnormality detecting unit configured to detect whether the protection link is abnormal before switching the service on the working link to the protection link ;

The switching unit is configured to switch the service on the working link to the protection link when there is no abnormality in the protection link.
The network element according to claim 8, wherein the protection link abnormality detecting unit is configured to

Detecting the protection link by using a bidirectional forwarding detection protocol, and determining whether the protection link is abnormal according to the detection result;

or

Transmitting, by the first user-side interface, a second detection packet to the network element of the backup node configured with the detection mechanism on the opposite end of the protection link;

Monitoring, by the network element of the standby tail node, the second detection response packet, and the second detection response packet is fed back by the third tail user node to the network element of the head node by using the third user side interface;

Whether the protection link is abnormal according to the monitoring result.
The network element according to any one of claims 7 to 9, wherein the switching unit is configured to determine whether the working link is abnormal by at least one of the following manners;

If the packet loss rate of the first detection packet is higher than the first packet loss threshold, if the working link is abnormal, otherwise, there is no abnormality;

The transmission delay of the first detection response packet is higher than the first delay threshold. If yes, the working link is abnormal. Otherwise, there is no abnormality.
A protection switching system includes: a head node network element and a main tail node network element;

A detection mechanism is configured on the network element of the head node and the network element of the main tail node, where the network element of the head node is configured to be configured to be sent to the opposite end of the working link by using the first user-side interface. The network element of the main tail node of the mechanism sends the first detection packet, and monitors the situation of the feedback response packet of the main tail node network element, and determines that the working link is abnormal according to the monitoring result, and the working link is The service on the switch is switched to the protection link;

The primary tail node network element is configured to feed back the first detection response message to the head node network element by using the second user side interface according to the first detection packet.
A computer storage medium having stored therein computer executable instructions for performing the protection switching method of any one of claims 1 to 6.
A network element includes a memory, a processor, and a computer program stored on the memory and operable on the processor, the processor implementing the program to implement the following steps:

The first user-side interface is configured with a detection mechanism, and the first user-side interface sends a first detection packet to the primary tail node network element configured with the detection mechanism on the opposite end of the working link;

Monitoring the situation that the primary tail node network element feeds back the first detection response packet, where the first detection response packet is fed back by the primary tail node to the head node network element through its second user side interface;

When the working link is abnormal according to the monitoring result, the service on the working link is switched to the protection link.