WO2023029902A1 - Dual-homing protection system, dual-homing protection method, and related device - Google Patents

Abstract

The present application provides a dual-homing protection system applied to an optical communication system. The dual-homing protection system comprises a first PE device, a second PE device, and a third PE device. A first OTN pipeline is established between the first PE device and the second PE device. A second OTN pipeline is established between the first PE device and the third PE device. A network side device is separately connected to the second PE device and the third PE device. The first PE device is configured to receive first forward service data from a user side network. If the first OTN pipeline is in a normal state, the first PE device is configured to send the first forward service data to the network side network by means of a first primary router. Otherwise, the first PE device is configured to send the first forward service data to the network side network by means of a first secondary router. A next hop of the first primary router is the second PE device. A next hop of the first secondary router is the third PE device. According to the present application, different OTN pipelines are established for the first PE device, such that the reliability of the system can be improved.

Description

Dual-homing protection system, dual-homing protection method and related equipment

This application claims the priority of the Chinese patent application with the application number 202111007545.1 and the application title "Dual Homing Protection System, Dual Homing Protection Method, and Related Equipment" filed with the State Intellectual Property Office of China on August 30, 2021, the entire content of which Incorporated in this application by reference.

technical field

The present application relates to the field of optical communication, in particular to a dual-homing protection system, a dual-homing protection method and related equipment.

Background technique

An optical transport network (OTN) can transmit different service data to the peer end through different OTN pipes. Different OTN pipes can correspond to different bandwidths and delays, so as to meet the diverse needs of users. FIG. 1 is a schematic structural diagram of an optical communication system using the OTN technology. As shown in FIG. 1 , the optical communication system includes a user-side device 101 , a first service provider edge (provider edge, PE) PE device 102 , a second PE device 103 and a network-side device 104 . The user-side device 101 is connected to the first PE device 102 . The second PE device 103 is connected to the network side device 104 . An OTN pipe is established between the first PE device 102 and the second PE device 103 . After the user side device 101 sends the forward service data to the first PE device 102, the first PE device 102 sends the forward service data to the second PE device 103 through the OTN pipe. The network side device 104 receives forward service data from the second PE device 103 .

In practical applications, if the OTN pipe fails, normal communication between the user-side device 101 and the network-side device 104 will be affected.

Contents of the invention

The present application provides a dual-homing protection system, a dual-homing protection method and related equipment. By establishing different OTN pipes for the first PE equipment, the reliability of the system can be improved.

The first aspect of the present application provides a dual-homing protection system. The dual-homing protection system includes a first PE device, a second PE device, and a third PE device. A first OTN pipe is established between the first PE device and the second PE device. A second OTN pipe is established between the first PE device and the third PE device. A second channel is established between the second PE device and the network side device. A third channel is established between the third PE device and the network side device. The first PE device is configured with a first primary route and a first backup route. The destination address of the first primary route and the first standby route is an Internet Protocol (internet protocol, IP) address of the network side device. The next hop of the first main route is the second PE device. The next hop of the first standby route is the third PE device. The first PE device is configured to receive the first forward service data from the user side device. If the first OTN pipe is in a normal state, the first PE device is configured to send the first forward service data to the network side device through the first main route. If the first OTN pipe is in an abnormal state, the first PE device is configured to send the first forward service data to the network side device through the first standby route.

In this application, system reliability can be improved by establishing the first OTN pipe and the second OTN pipe for the first PE device.

In an optional manner of the first aspect, the second PE device is configured with a second forward primary route and a second forward standby route. The destination address of the second forward primary route and the second forward standby route is the IP address of the network side device. The next hop of the second forward main route is the network side device. The next hop of the second forward standby route is the third PE device. If the first OTN pipe is in a normal state, the second PE device is configured to receive the first forward service data from the user side device. If the second channel is in a normal state, the second PE device is configured to send the first forward service data to the network side device through the second forward main route. If the second channel is in an abnormal state, the second PE device is configured to send the first forward service data to the network side device through the second forward standby route. Wherein, when the second channel fails, the second PE device may directly send the first forward service data to the network side device through the second forward standby route. Therefore, the second PE device may not need to exchange information for line switching with the third PE device, thereby improving switching efficiency.

In an optional manner of the first aspect, the third PE device is configured with a third forward primary route and a third forward standby route. The destination address of the third forward primary route and the third forward standby route is the IP address of the network side device. The next hop of the third forward main route is the network side device. The next hop of the third forward standby route is the second PE device. If the first OTN pipe is in an abnormal state, the third PE device is configured to receive the first forward service data from the user side device. If the third channel is in a normal state, the third PE device is configured to send the first forward service data to the network side device through the third forward main route. If the third channel is in an abnormal state, the third PE device is configured to send the first forward service data to the network side device through the third forward standby route. Wherein, when the third channel fails, the third PE device may directly send the first forward service data to the network side device through the third forward standby route. Therefore, the third PE device may not need to exchange information for line switching with the second PE device, thereby improving switching efficiency.

In an optional manner of the first aspect, the second PE device is configured with a second reverse primary route and a second reverse backup route. The destination address of the second reverse main route and the second reverse standby route is the IP address of the user-side device. The next hop of the second reverse primary route is the first PE device, and the next hop of the second forward standby route is the third PE device. If the second channel is in a normal state, the second PE device is used to receive reverse service data from the network side device. If the first OTN pipe is in a normal state, the second PE device is configured to send reverse service data to the user side device through the second reverse main route. If the first OTN pipe is in an abnormal state, the second PE device is configured to send reverse service data to the user side device through the second reverse standby route. Wherein, when the first OTN pipe fails, the second PE device may directly send reverse service data to the user side device through the second reverse standby route. Therefore, the second PE device may not need to exchange information for line switching with the third PE device, thereby improving switching efficiency.

In an optional manner of the first aspect, the third PE device is configured with a third reverse primary route and a third reverse backup route. The destination address of the third reverse main route and the third forward standby route is the IP address of the user-side device. The next hop of the third reverse primary route is the first PE device. The next hop of the third forward standby route is the second PE device. If the second channel is in an abnormal state, the third PE device is used to receive reverse service data from the network side device. If the second OTN pipe is in a normal state, the third PE device is configured to send reverse service data to the user side device through the third reverse main route. If the second OTN pipe is in an abnormal state, the second PE device is configured to send reverse service data to the user side device through the third reverse standby route. Wherein, when the second OTN pipe fails, the third PE device may directly send reverse service data to the user side device through the third reverse standby route. Therefore, the third PE device may not need to exchange information for line switching with the second PE device, thereby improving switching efficiency.

In an optional manner of the first aspect, if the first OTN pipe and the second channel are in a normal state, the first PE device is configured to send the first forward service data to the network side device through the first main route. If the first OTN pipe or the second channel is in an abnormal state, the first PE device is configured to send the first forward service data to the network side device through the first standby route. Wherein, when no channel is established between the second PE device and the third PE device, if the second channel is in an abnormal state, the network side device cannot receive the first forward service data through the first OTN pipe. In this application, only when the first OTN pipe and the second channel are in a normal state, the first PE device sends the first forward service data to the network side device through the first main route. Therefore, the present application can improve the reliability of communication.

In an optional manner of the first aspect, the first PE device is further configured to receive the first detection data from the second PE device. The first PE device is also used to confirm whether the second channel is in a normal state according to the first detection data. Wherein, the first PE device cannot directly detect whether the second channel is in a normal state through bidirectional forwarding detection (bidirectional forwarding detection, BFD). In this application, the first PE device may determine whether the second channel is in a normal state through the first detection data. Therefore, the present application can improve the reliability of communication.

In an optional manner of the first aspect, the first PE device is further configured to receive the information of the first main route from the second PE device. The first PE device is further configured to receive the information of the first backup route from the third PE device. Wherein, the user may configure the first primary route and the first backup route on the first PE device through manual configuration. However, when there are many PE devices in the system, a large labor cost is required. For this reason, the present application can obtain the first primary route and the first backup route by extending the path computation element communication protocol (path computation element communication protocol, PCEP) protocol. At this time, the first PE device receives the information of the first primary route from the second PE device. The first PE device receives information about the first backup route from the third PE device. Therefore, the present application can reduce labor costs.

In an optional manner of the first aspect, the first PE device is further configured to detect whether the first OTN pipe is in a normal state by using an OTN pipe state detection technology. Among them, BFD is a three-layer detection technology. When the first PE device adopts the OTN pipe state detection technology, the first PE device 201 detects the state of the first OTN pipe at the physical layer. Therefore, the present application can save physical resources for detection.

In an optional manner of the first aspect, the first PE device is configured to receive the first forward service data from the user-side device through the first optical virtual private network (OVPN). The first PE device is also configured with a second primary route and a second backup route. The destination addresses of the second primary route and the second standby route are the IP addresses of the network side devices. The next hop of the second primary route is the third PE device. The next hop of the second standby route is the second PE device. The first PE device is further configured to receive the second forward service data from the user side device through the second OVPN. If the second OTN pipe is in a normal state, the first PE device is further configured to send the second forward service data to the network side device through the second main route. If the second OTN pipe is in an abnormal state, the first PE device is further configured to send the second forward service data to the network side device through the second standby route. Wherein, when both the first OTN pipe and the first OTN pipe are in a normal state, the first PE device can implement data offloading through the second (optical virtual private network, OVPN). Therefore, the present application can improve communication efficiency.

The second aspect of the present application provides a dual-homing protection method. The dual-homing protection method can be applied to the first PE device. The dual-homing protection method includes the following steps: the first PE device receives the first forward service data from the user side device. A first OTN pipe is established between the first PE device and the second PE device. A second OTN pipe is established between the first PE device and the third PE device. A second channel is established between the second PE device and the network side device. A third channel is established between the third PE device and the network side device. The first PE device is configured with a first primary route and a first backup route. The destination addresses of the first primary route and the first backup route are the IP addresses of the network side devices. The next hop of the first main route is the second PE device. The next hop of the first standby route is the third PE device. If the first OTN pipe is in a normal state, the first PE device sends the first forward service data to the network side device through the first main route. If the first OTN pipe is in an abnormal state, the first PE device sends the first forward service data to the network side device through the first standby route.

In an optional manner of the second aspect, if the first OTN pipe and the second channel are in a normal state, the first PE device sends the first forward service data to the network side device through the first main route. If the first OTN pipe or the second channel is in an abnormal state, the first PE device is configured to send the first forward service data to the network side device through the first standby route.

In an optional manner of the second aspect, the first PE device receives the first detection data from the second PE device. The first PE device confirms whether the second channel is in a normal state according to the first detection data.

In an optional manner of the second aspect, the dual-homing protection method further includes the following steps: the first PE device receives information about the first primary route from the second PE device. The first PE device receives information about the first backup route from the third PE device.

In an optional manner of the second aspect, the first PE device detects whether the first OTN pipe is in a normal state through an OTN pipe state detection technology.

In an optional manner of the second aspect, the first PE device receives the first forward service data from the user side device through the first OVPN. The first PE device is also configured with a second primary route and a second backup route. The destination addresses of the second primary route and the second standby route are the IP addresses of the network side devices. The next hop of the second primary route is the third PE device. The next hop of the second standby route is the second PE device. The dual-homing protection method further includes the following steps: the first PE device receives the second forward service data from the user-side device through the second OVPN. If the second OTN pipe is in a normal state, the first PE device sends the second forward service data to the network side device through the second main route. If the second OTN pipe is in an abnormal state, the first PE device sends the second forward service data to the network side device through the second standby route.

The third aspect of the present application provides a dual-homing protection method. The dual-homing protection method can be applied to the second PE device. The dual-homing protection method includes the following steps: the second PE device receives the first forward service data from the first PE device. A third OTN pipe is established between the second PE device and the third PE device. A second channel is established between the second PE device and the network side device. A third channel is established between the third PE device and the network side device. The second PE device is configured with a second forward primary route and a second forward standby route. The destination address of the second forward primary route and the second forward standby route is the IP address of the network side device. The next hop of the second forward main route is the network side device. The next hop of the second forward standby route is the third PE device. If the second channel is in a normal state, the second PE device sends the first forward service data to the network side device through the second forward main route. If the second channel is in an abnormal state, the second PE device sends the first forward service data to the network side device through the second forward backup route.

In an optional manner of the third aspect, the first OTN pipe is established between the first PE device and the second PE device. The first PE device and the third PE device establish a second OTN pipe. A first channel is established between the first PE device and the user-side device. The second PE device is configured with a second reverse main route and a second reverse backup route. The destination address of the second reverse main route and the second reverse standby route is the IP address of the user-side device. The next hop of the second reverse primary route is the first PE device. The next hop of the second forward standby route is the third PE device. The dual-homing protection method further includes the following steps: the second PE device receives reverse service data from the network side device. If the first OTN pipe is in a normal state, the second PE device sends reverse service data to the user side device through the second reverse main route. If the first OTN pipe is in an abnormal state, the second PE device sends reverse service data to the user side device through the second reverse backup route.

In an optional manner of the third aspect, the second PE device is further configured to detect whether the first OTN pipe is in a normal state by using an OTN pipe state detection technology.

In an optional manner of the third aspect, the dual-homing protection method further includes the following step: the second PE device receives information of the second reverse primary route from the first PE device. The second PE device receives the information of the second forward backup route from the third PE device.

The fourth aspect of the present application provides a dual-homing protection device. The dual-homing protection device includes a receiving module and a sending module. The receiving module is used for receiving the first forward service data from the user side equipment. A first OTN pipe is established between the dual-homing protection device and the second PE equipment. A second OTN pipeline is established between the dual-homing protection device and the third PE equipment. A second channel is established between the second PE device and the network side device. A third channel is established between the third PE device and the network side device. The sending module is configured with a first primary route and a first backup route. The destination addresses of the first primary route and the first backup route are the Internet Protocol IP addresses of the network side equipment. The next hop of the first main route is the second PE device. The next hop of the first standby route is the third PE device. The sending module is configured to send the first forward service data to the network side device through the first main route if the first OTN pipe is in a normal state. The sending module is further configured to send the first forward service data to the network side device through the first standby route if the first OTN pipe is in an abnormal state.

In an optional manner of the fourth aspect, the receiving module is further configured to receive the information of the first primary route from the second PE device. The receiving module is also used to receive the information of the first backup route from the third PE device.

In an optional manner of the fourth aspect, the dual-homing protection device further includes a detection module. The detection module is used to detect whether the first OTN pipe is in a normal state through the OTN pipe state detection technology.

In an optional manner of the fourth aspect, the receiving module is configured to receive the first forward service data from the user-side device through the first OVPN. The sending module is also configured with a second main route and a second backup route. The destination addresses of the second primary route and the second standby route are the IP addresses of the network side devices. The next hop of the second primary route is the third PE device. The next hop of the second standby route is the second PE device. The receiving module is further configured to receive the second forward service data from the user side equipment through the second OVPN. The sending module is further configured to send the second forward service data to the network side device through the second main route if the second OTN pipe is in a normal state. The sending module is further configured to send the second forward service data to the network side device through the second backup route if the second OTN pipe is in an abnormal state.

In an optional manner of the fourth aspect, the sending module is configured to send the first forward service data to the network side device through the first main route if the first OTN pipe and the second channel are in a normal state. The sending module is configured to send the first forward service data to the network side device through the first backup route if the first OTN pipe or the second channel is in an abnormal state.

In an optional manner of the fourth aspect, the receiving module is further configured to receive the first detection data from the second PE device. The dual-homing protection device also includes a processing module. The processing module is used to confirm whether the second channel is in a normal state according to the first detection data.

The fifth aspect of the present application provides a dual-homing protection device. The dual-homing protection device includes a receiving module and a sending module. The receiving module is used to receive the first forward service data from the first PE device. A third OTN pipeline is established between the dual-homing protection device and the third PE equipment. A second channel is established between the dual-homing protection device and the network-side device. A third channel is established between the third PE device and the network side device. The sending module is configured with a second forward primary route and a second forward standby route. The destination address of the second forward primary route and the second forward standby route is the IP address of the network side device. The next hop of the second forward main route is the network side device. The next hop of the second forward standby route is the third PE device. The sending module is configured to send the first forward service data to the network side device through the second forward main route if the second channel is in a normal state. The sending module is further configured to send the first forward service data to the network side device through the second forward standby route if the second channel is in an abnormal state.

In an optional manner of the fifth aspect, a first OTN pipe is established between the first PE device and the dual-homing protection device. The first PE device and the third PE device establish a second OTN pipe. A first channel is established between the first PE device and the user-side device; the sending module is also configured with a second reverse main route and a second reverse backup route. The destination address of the second reverse main route and the second reverse standby route is the IP address of the user-side device. The next hop of the second reverse primary route is the first PE device. The next hop of the second forward standby route is the third PE device. The receiving module is also used for receiving reverse service data from the network side equipment. The sending module is further configured to send the reverse service data to the user-side device through the second reverse main route if the first OTN pipe is in a normal state. The sending module is further configured to send the reverse service data to the user-side device through the second reverse backup route if the first OTN pipe is in an abnormal state.

In an optional manner of the fifth aspect, the dual-homing protection device further includes a detection module. The detection module is used to detect whether the first OTN pipe is in a normal state through the OTN pipe state detection technology.

In an optional manner of the fifth aspect, the receiving module is further configured to receive information of the second reverse primary route from the first PE device. The receiving module is further configured to receive the information of the second forward backup route from the third PE device.

The sixth aspect of the present application provides a first PE device. The first PE device includes memory and a transceiver. The transceiver is used for receiving the first forward service data from the user side equipment. A first optical transport network OTN pipe is established between the first PE device and the second service provider edge PE device. A second OTN pipe is established between the first PE device and the third PE device. A second channel is established between the second PE device and the network side device. A third channel is established between the third PE device and the network side device. The first primary route and the first standby route are stored in the memory. The destination addresses of the first primary route and the first backup route are the Internet Protocol IP addresses of the network side equipment. The next hop of the first main route is the second PE device. The next hop of the first standby route is the third PE device. The transceiver is further configured to send the first forward service data to the network side device through the first main route if the first OTN pipe is in a normal state. The transceiver is further configured to send the first forward service data to the network side device through the first standby route if the first OTN pipe is in an abnormal state.

In an optional manner of the sixth aspect, the first PE device may further include a processor. The transceiver or the processor of the first PE device is further configured to execute the method in the foregoing second aspect or any optional manner of the second aspect.

The seventh aspect of the present application provides a second PE device. The second PE device includes memory and a transceiver. The transceiver is used to receive first forward service data from the first PE device. A third OTN pipe is established between the second PE device and the third PE device. A second channel is established between the second PE device and the network side device. A third channel is established between the third PE device and the network side device. A second forward primary route and a second forward standby route are stored in the memory. The destination address of the second forward primary route and the second forward standby route is the IP address of the network side device. The next hop of the second forward main route is the network side device. The next hop of the second forward standby route is the third PE device. The transceiver is further configured to send the first forward service data to the network side device through the second forward main route if the second channel is in a normal state. The transceiver is further configured to send the first forward service data to the network side device through the second forward standby route if the second channel is in an abnormal state.

In an optional manner of the seventh aspect, the first PE device may further include a processor. The transceiver or the processor of the first PE device is further configured to execute the method in the foregoing third aspect or any optional manner of the third aspect.

The eighth aspect of the present application provides a computer storage medium, which is characterized in that instructions are stored in the computer storage medium, and when the instructions are executed on the computer, the computer executes the method according to the second aspect or any implementation manner of the second aspect ; or causing the computer to execute the third aspect or the method of any one implementation manner of the third aspect.

The ninth aspect of the present application provides a computer program product, which is characterized in that, when the computer program product is executed on a computer, it causes the computer to execute the method according to the second aspect or any implementation manner of the second aspect; or causes the computer to execute the method such as The third aspect or the method of any implementation manner of the third aspect.

Description of drawings

FIG. 1 is a schematic structural diagram of an optical communication system using OTN technology;

Fig. 2 is the first schematic structural diagram of the dual-homing protection system provided in this application;

FIG. 3 is a schematic structural diagram of an extended PCEP message provided in this application;

FIG. 4 is a second structural schematic diagram of the dual-homing protection system provided in this application;

FIG. 5 is a third structural schematic diagram of the dual-homing protection system provided in this application;

FIG. 6 is a fourth structural schematic diagram of the dual-homing protection system provided in this application;

Figure 7 is a schematic flow diagram of the dual-homing protection method provided in the present application;

Figure 8 is a schematic structural diagram of the dual-homing protection device provided in this application;

FIG. 9 is a schematic structural diagram of a computer device provided in this application.

Detailed ways

The present application provides a dual-homing protection system, a dual-homing protection method, and related equipment, by establishing different optical transport network (optical transport network, OTN) pipelines for the first service provider edge (provider edge, PE) equipment, which can Improve system reliability. It should be understood that "first", "second", "forward", "reverse" and the like used in this application are only for the purpose of distinguishing descriptions, and cannot be understood as indicating or implying relative importance, nor can they be understood To indicate or imply order and direction. In addition, reference numerals and/or letters are repeated in the various figures of this application for the sake of brevity and clarity. Repetition does not imply a strictly limited relationship between the various embodiments and/or configurations.

The dual-homing protection method in this application can be applied to optical communication systems in the field of optical communication. In the optical communication system in FIG. 1 , if the OTN pipe fails, normal communication between the user-side device 101 and the network-side device 104 will be affected.

For this reason, the present application provides a dual-homing protection system. Fig. 2 is a schematic diagram of the first structure of the dual-homing protection system provided in this application. As shown in FIG. 2 , the dual-homing protection system includes a user-side device 200 , a first PE device 201 , a second PE device 202 , a third PE device 203 and a network-side device 204 .

Wherein, the user-side device 200 may be an optical network terminal (optical network terminal, ONT), an optical line terminal (optica line terminal, OLT), or a router. The user-side device 200 is in the first network domain. In the first network domain, the user-side device 200 may be connected to the user equipment. The user equipment may be a mobile phone or a tablet computer. The user equipment can also be a virtual reality (virtual reality, VR) terminal, an augmented reality (augmented reality, AR) terminal, a wireless terminal in industrial control, a wireless terminal in unmanned driving, a wireless terminal in telemedicine, or a smart grid. Wireless terminals in smart cities, wireless terminals in smart homes, wireless terminals in smart homes, vehicle-mounted terminals, etc. The network side device 204 may be a router or an application server or the like. The network side device 204 is in the second network domain. The first network domain and the second network domain may be Internet protocol (internet protocol, IP) networks.

The user-side device 200 and the first PE device 201 establish a first channel. The first channel can be obtained through IP static routing configuration. When the destination address of the forward service data is the IP address of the network-side device 204, the user-side device 200 is configured to send the forward service data to the first PE device 201 through the first channel. When the destination address of the received reverse service data is the IP address of the user-side device 200, the first PE device 201 is configured to send the reverse service data to the user-side device 200 through the first channel. Wherein, the data sent by the user-side device 200 to the network-side device 204 is called forward service data. The data sent by the network-side device 204 to the user-side device 200 is called reverse service data.

Similarly, the network side device 204 and the second PE device 202 establish a second channel. The network side device 204 and the third PE device 203 establish a third channel. The second channel and the third channel can be obtained through IP static routing configuration. When the destination address of the reverse service data is the IP address of the user-side device 200, the network-side device 204 is configured to send the reverse service data to the user-side device 200 through the second channel or the third channel. When the destination address of the forward service data received by the second PE device 202 is the IP address of the network-side device 204, the second PE device 202 is configured to send the forward service data to the network-side device 204 through the second channel. When the destination address of the forward service data received by the third PE device 203 is the IP address of the network side device 204, the third PE device 203 is configured to send the forward service data to the network side device 204 through the third channel.

The first PE device 201, the second PE device 202, and the third PE device 203 are in the transport network. The transport network is an optical transport network (OTN). The first PE device 201, the second PE device 202, and the third PE device 203 are OTN devices. A one-hop direct first OTN pipe is established between port 1 of the first PE device 201 and port 3 of the second PE device 202 . A one-hop direct second OTN pipe is established between port 2 of the first PE device 201 and port 4 of the third PE device 203 . The second PE device 202 and the third PE device 203 are active and standby nodes for each other. The second PE device 202 is the master node. The third PE device 203 is a standby node. Wherein, the first PE device 201 , the second PE device 202 and the third PE device 203 are also referred to as network nodes or nodes. OTN pipes are also called links or channels.

The optical transport network may be an automatically switched optical network (ASON) using a generalized multi protocol label switching technology (generalized multi protocol label switching, GMPLS). The ASON can establish the first OTN pipe and the second OTN pipe through resource reservation protocol traffic engineering (resource reservation protocol traffic engineering, RSVP-TE). Take the establishment of the first OTN pipe as an example. ASON can also include network management equipment. The network management device may be an intelligent network management (network cloud engine, NCE) or a path computation element (path computation element, PCE). When the network management device is a PCE, the PCE may be a software program in the first PE device 201 , the second PE device 202 and the third PE device 203 . The network management device is configured to issue a command for creating an OTN pipe to the first PE device 201 . The first PE device 201 is used to obtain information about other nodes in the entire network through an open shortest path first (open shortest path first, OSPF) protocol. The information of other nodes includes node data and link data. The first PE device 201 is configured to calculate a service path from the first PE device 201 to the second PE device 202 through a constraint-based shortest path first algorithm (Constrained Shortest Path First, CSPF). Afterwards, the first PE device 201 is used to establish a first OTN pipe between the first PE device 201 and the second PE device 202 through RSVP-TE.

The first PE device 201 is configured with a first primary route and a first backup route at the IP layer. The first primary route and the first backup route may be routing and forwarding tables in the first PE device 201 . The destination address of the first primary route and the first backup route is the IP address of the network side device 204 . The next hop of the first main route is the second PE device 202 . The first main route corresponds to the first OTN pipe. The outbound interface of the first primary route is port 1 of the first PE device 201 . The next hop of the first standby route is the third PE device 203 . The first standby route corresponds to the second OTN pipe. The outbound interface of the first backup route is port 2 of the first PE device 201 .

In practical applications, the first primary route and the first backup route can be manually configured, or the first primary route and the first backup route can be obtained by extending the path computation element communication protocol (PCEP) protocol. Wherein, the existing PCEP message does not support routing to the next hop. This application needs to extend the PCEP message. FIG. 3 is a schematic structural diagram of an extended PCEP message provided in this application. As shown in FIG. 3 , the extended PCEP message 301 includes nine fields. The nine fields are destination IP address, IP prefix list, flag, S, R, next hop IP, next hop MAC, node role and associated node.

Wherein, the destination IP address field is the destination address of the route. The IP prefix list field is the length of consecutive bits of 1 in the mask of the destination IP address. The flag field is a reserved flag bit. The S field identifies the routing flag on the server side. Setting the S field to 1 indicates forward service data routing. Setting the S field to 0 indicates the route of the reverse service data. The R field identifies the remove flag. Setting the R field to 1 means deleting routing information, and setting the R field to 0 means adding routing information. The next hop IP field indicates the IP address of the next hop. The next hop MAC field indicates the MAC address of the next hop. The node role field indicates the role of the next hop. The role of the next hop can be the active node or the standby node. The associated node field indicates the node that is active and standby with the next hop.

When configuring a route for the first PE device 201 through the extended PCEP protocol, the PCE obtains two extended PCEP packets according to the active/standby relationship between the second PE device 202 and the third PE device 203 . The PCE sends the two extended PCEP packets to the second PE device 202 and the third PE device 203 respectively. Wherein, the two extended PCEP packets are PCEP packet 1 and PCEP packet 2 respectively. After the second PE device 202 receives the PCEP packet 1, the second PE device 202 sends the PCEP packet 1 to the first PE device 201 . After the third PE device 203 receives the PCEP packet 2 , the third PE device 203 sends the PCEP packet 2 to the first PE device 201 .

In the PCEP message 1 and the PCEP message 2, the destination IP address field is the destination address of the forward service data, that is, the IP address of the network side device 204 . The S field and R field in PCEP message 1 and PCEP message 2 are set to 1. The next hop IP field in the PCEP message 1 is the IP address of the second PE device 202 . The next-hop IP field in the PCEP packet 2 is the IP address of the third PE device 203 . The next-hop MAC field in the PCEP message 1 is the MAC address of the second PE device 202 . The next-hop MAC field in the PCEP message 2 is the MAC address of the third PE device 203 . The node role field in PCEP message 1 is the master node. The node role field in PCEP message 2 is the standby node. The first PE device 201 may agree with the second PE device 202 on the representation manner of the primary node or the standby node. For example, 1 indicates the active node, and 0 indicates the standby node. The associated node field in the PCEP message 1 is the identifier of the third PE device 203 . The identifier of the third PE device 203 may be the IP address of the third PE device 203 . The associated node field in the PCEP packet 2 is the identifier of the second PE device 202 . The identifier of the second PE device 202 may be the IP address of the second PE device 202 .

PCEP message 1 and PCEP message 2 can be transmitted through OTN control overhead. The OTN control overhead can be general communication channel overhead 1 (general communication1, GCC1), GCC2 or GCC0. The first PE device 201 receives the PCEP packet 1 from the second PE device 202 . The first PE device 201 receives the PCEP packet 2 from the third PE device 203 . The first PE device 201 obtains the first primary route and the first backup route according to the PCEP message 1 and the PCEP message 2 . Wherein, PCEP packet 1 carries information of the first primary route. PCEP packet 2 carries information about the first backup route. The first primary route and the first backup route are also called the primary/standby route protection group. The first PE device 201 configures the active/standby route protection group on the forwarding plane to form a three-layer active/standby route protection.

After configuring the first primary route and the first backup route, the first PE device 201 receives the first forward service data from the user-side device 200 . The source address of the first forward service data is the IP address of the user-side device 200 . The destination address of the first forward service data is the IP address of the network side device 204 . If the first OTN pipe is in a normal state, the first PE device 201 is configured to send the first forward service data to the network side device 204 through the first main route. The next hop of the first main route is the second PE device 202 . The second PE device 202 is configured to receive the first forward service data through the first OTN pipe. The second PE device 202 is configured to send the first forward service data to the network side device 204 through the second channel. If the first OTN pipe is in an abnormal state, the first PE device 201 is used to send the first forward service data to the network side device 204 through the first standby route. The next hop of the first standby route is the third PE device 203 . The third PE device 203 is configured to receive the first forward service data through the second OTN pipe. The third PE device 203 is configured to send the first forward service data to the network side device 204 through the third channel.

The first PE device 201 may determine whether the first OTN pipe is in a normal state through bidirectional forwarding detection (bidirectional forwarding detection, BFD). Specifically, a first stage of BFD protocol detection is configured between the first PE device 201 and the second PE device 202 . After a fault occurs on the first OTN pipe, such as a fiber break, the first PE device 201 and the second PE device 202 can quickly detect the fault through the BFD protocol. The first PE device 201 determines that the first OTN pipe is in an abnormal state.

In practical applications, the first PE device 201 may send the first forward service data to the network side device 204 through the first main route when both the first OTN pipe and the second channel are in a normal state. The first PE device 201 determines whether the second channel is in a normal state according to the detection data sent by the second PE device 202 . Specifically, a second stage of BFD protocol detection is configured between the second PE device 202 and the network side device 204 . After a failure occurs on the second channel, the network side device 204 and the second PE device 202 can quickly detect the failure through the BFD protocol. The second PE device 202 obtains the first detection data according to the BFD protocol, and sends the first detection data to the first PE device 201 . The first PE device 201 determines whether the second channel is in a normal state according to the first detection data.

A third stage of BFD protocol detection may be configured between the first PE device 201 and the third PE device 203 . A fourth stage of BFD protocol detection is configured between the third PE device 203 and the network side device 204 . Similar to the foregoing description, the first PE device 201 may determine whether the second OTN pipe is in a normal state according to the third stage of the BFD protocol detection. The second PE device 202 can detect and determine whether the third channel is in a normal state according to the fourth segment of the BFD protocol. When both the first transmission link and the second transmission link are in an abnormal state, the first PE device 201 may generate an alarm.

The network side device 204 may determine whether the second channel is in a normal state according to the second stage of BFD protocol detection. If the second channel is in a normal state, the network side device 204 may send reverse service data to the second PE device 202 through the second channel. If the second channel is in an abnormal state, the network side device 204 may send reverse service data to the third PE device 203 through the third channel. Alternatively, the network side device 204 determines whether the third channel is in a normal state according to the fourth segment of the BFD protocol detection. If the third channel is in a normal state, the network side device 204 may send reverse service data to the third PE device 203 through the third channel. If the second channel is in an abnormal state, the network side device 204 may send reverse service data to the second PE device 202 through the second channel.

In this application, when the first OTN pipe is in an abnormal state, the first PE device 201 may transmit service data through the second OTN pipe. Therefore, by establishing different OTN pipes for the first PE device 201, system reliability can be improved.

In practical applications, the BFD protocol is a three-layer detection technology. The first PE device 201 needs to interpret the BFD protocol packet at the IP layer. Therefore, the BFD protocol requires more physical resources. To this end, the first PE device 201 may determine whether the first OTN pipe is in a normal state through an OTN pipe state detection technology. At this time, the first PE device 201 detects the status of the first OTN pipe at the physical layer, thereby saving physical resources.

In practical applications, in order to improve the flexibility of network slicing, the first OTN pipe or the second OTN pipe may be a Liquid OTN pipe. Liquid OTN pipes are also called optical service container (optical service unit, OSU) pipes. Liquid OTN pipeline is a pipeline that adopts Liquid OTN technology. Liquid OTN technology introduces a service-oriented OSU. Liquid OTN technology optimizes and adds a new layer of OSU particles on the traditional OTN mechanism.

In practical application, in order to realize the isolation of different service data, before receiving the first forward service data, the NCE can create the first optical virtual private network (optical virtual private network, OVPN). Specifically, the first OVPN includes a first PE device 201 , a second PE device 202 and a third PE device 203 . The first PE device 201 is connected to the user-side device 200 through a first port. One end of the first channel is the first port of the first PE device 201 . The second PE device 202 is connected to the network side device 204 through a second port. One end of the second channel is the second port of the second PE device 202 . The third PE device 203 is connected to the network side device 204 through a third port. One end of the third channel is the third port of the third PE device 203 . The first OVPN also includes a first port, a second port and a third port. The first OVPN also includes a first OTN pipe and a second OTN pipe. The first PE device 201 receives the first forward service data through the first OVPN. The first forward service data reaches the network side device 204 after passing through the first OVPN. The reverse service data reaches the user-side device 200 after passing through the first OVPN.

Different service data may come from different user-side devices, and ultimately access the same network-side device. At this time, different service data include different source addresses and the same destination address. For example, another PE device is connected to another user-side device through a connection port. Two OTN pipes are established between another PE device and the two PE devices. There is a one-to-one correspondence between two OTN pipes and two PE devices. The two PE devices are the second PE device 202 and the third PE device 203 respectively. NCE can create another OVPN. Another OVPN includes another PE device, a second PE device 202 and a third PE device 203 . Another OVPN also includes a connection port, a second port and a third port. Another OVPN also includes two OTN pipes.

Different service data may come from the same user-side device, and finally access different network-side devices. At this time, different service data include the same source address and different destination addresses. For example, there is another network-side device connected to the two connection ports of the two PE devices respectively. The two PE devices respectively establish two OTN pipes with the first PE device 201 . There is a one-to-one correspondence between two OTN pipes and two PE devices. NCE can create another OVPN. Another OVPN includes the first PE device 201 and two PE devices. Another OVPN also includes a first port and two connection ports. Another OVPN network also includes two OTN pipes.

Different business data may come from the same user-side device, and finally access the same network-side device. At this time, different service data include the same source address and the same destination address. For example, the first PE device 201 is also connected to the user-side device 200 through the fourth port. The second PE device 202 is also connected to the network side device 204 through the fifth port. The third PE device 203 is also connected to the network side device 204 through the sixth port. NCE creates a second OVPN. The second OVPN includes a first PE device 201 , a second PE device 202 and a third PE device 203 . The second OVPN also includes a fourth port, a fifth port and a sixth port. The second OVPN also includes the first OTN pipe and the second OTN pipe.

The first PE device 201 receives the second forward service data through the second OVPN. The source addresses of the second forward service data and the first forward service data are the same. The destination addresses of the second forward service data and the first forward service data are the same. The first PE device 201 also includes a second primary route and a second backup route. The destination address of the second primary route and the second standby route is the IP address of the network side device 204 . The next hop of the second main route is the third PE device 203 . The next hop of the second standby route is the second PE device 202 . For the description of configuring the second primary route and the second backup route on the first PE device 201, reference may be made to the foregoing description of configuring the first primary route and the first backup route on the first PE device 201. If the second OTN pipe is in a normal state, the first PE device 201 sends the second forward service data to the network side device 204 through the second main route. If the second OTN pipe is in an abnormal state, the first PE device 201 sends the second forward service data to the network side device 204 through the second standby route.

The present application also provides another dual-homing protection system. Specifically, FIG. 4 is a second structural schematic diagram of the dual-homing protection system provided in this application. As shown in FIG. 4 , on the basis of FIG. 2 , a channel is established between the second PE device 202 and the third PE device 203 . For example, a third OTN pipe through the first hop is established between port 5 of the second PE device 202 and port 6 of the third PE device 203 .

According to the foregoing description of FIG. 2 , if the first OTN pipe is in a normal state, the first PE device 201 is configured to send the first forward service data to the second PE device 202 through the first main route. The second PE device 202 is configured with a second forward primary route and a second forward standby route. The destination address of the second forward primary route and the second forward standby route is the IP address of the network side device 204 . The next hop of the second forward main route is the network side device 204 . The next hop of the second forward standby route is the third PE device 203 . After receiving the first forward service data, if the second channel is in a normal state, the second PE device 202 is configured to send the first forward service data to the network side device 204 through the second forward main route. If the second channel is in an abnormal state, the second PE device 202 is configured to send the first forward service data to the network side device 204 through the second forward standby route.

According to the foregoing description of FIG. 2 , if the first OTN pipe is in an abnormal state, the first PE device 201 is configured to send the first forward service data to the third PE device 203 through the first standby route. The third PE device 203 may be configured with a third forward primary route and a third forward standby route. The destination address of the third forward primary route and the third forward standby route is the IP address of the network side device 204 . The next hop of the third forward main route is the network side device 204 . The next hop of the third forward standby route is the second PE device 202 . After receiving the first forward service data, if the third channel is in a normal state, the third PE device 203 is configured to send the first forward service data to the network side device 204 through the third forward main route. If the third channel is in an abnormal state, the third PE device 203 is configured to send the first forward service data to the network side device 204 through the third forward standby route.

In practical applications, the second PE device 202 may also be configured with a second reverse primary route and a second reverse backup route. The destination addresses of the second reverse main route and the second reverse backup route are the IP address of the user-side device 200 . The next hop of the second reverse main route is the first PE device 201 . The next hop of the second reverse standby route is the third PE device 203 . According to the foregoing description of FIG. 2 , if the second channel is in a normal state, the second PE device 202 is configured to receive reverse service data from the network side device 204 . The destination address of the reverse service data is the IP address of the user-side device 200 . After receiving the reverse service data, if the first OTN pipe is in a normal state, the second PE device is configured to send the reverse service data to the user side device 200 through the second reverse main route. If the first OTN pipe is in an abnormal state, the second PE device 202 is configured to send reverse service data to the user side device 200 through the second reverse standby route.

Similarly, the third PE device 203 may also be configured with a third reverse primary route and a third reverse backup route. The destination addresses of the third reverse primary route and the third forward standby route are the IP address of the user-side device 200 . The next hop of the third reverse main route is the first PE device 201 . The next hop of the third reverse standby route is the second PE device 202 . According to the foregoing description of FIG. 2 , if the second channel is in an abnormal state, the third PE device 203 is used to receive reverse service data from the network side device 204 . After receiving the reverse service data, if the second OTN pipe is in a normal state, the third PE device is configured to send the reverse service data to the user side device 200 through the third reverse main route. If the second OTN pipe is in an abnormal state, the second PE device 202 is configured to send reverse service data to the user side device 200 through the third reverse standby route.

It should be understood that the dual-homing protection system in FIG. 4 has a similar structure to the dual-homing protection system in FIG. 2 . Therefore, for the description in FIG. 4 , reference may be made to the description in FIG. 2 above.

For example, the second PE device 202 may obtain the second reverse primary route and the second reverse backup route by extending the PCEP protocol. Specifically, the second PE device 202 is configured to receive the PCEP packet 3 from the first PE device 201 . The second PE device 202 is configured to receive the PCEP packet 4 from the third PE device 203 . The second PE device 202 obtains the second reverse primary route and the second reverse backup route according to the PCEP message 3 and the PCEP message 4 . Wherein, the PCEP packet 3 carries information of the second reverse main route. PCEP packet 4 carries information about the second reverse backup route. Regarding the formats of the PCEP message 3 and the PCEP message 4, reference may be made to the relevant description of the aforementioned PCEP message 1 and the PCEP message 2 .

Similarly, the third PE device 203 can obtain the third reverse main route and the third reverse backup route by extending the PCEP protocol. Specifically, the third PE device 203 is configured to receive the PCEP packet 5 from the first PE device 201 . The third PE device 203 is configured to receive the PCEP packet 6 from the second PE device 202 . The third PE device 203 obtains the third reverse primary route and the third reverse backup route according to the PCEP message 5 and the PCEP message 6 . Wherein, the PCEP packet 5 carries information of the third reverse primary route. PCEP packet 6 carries information of the third reverse standby route. Regarding the formats of the PCEP message 5 and the PCEP message 6, reference may be made to the relevant description of the aforementioned PCEP message 1 and the PCEP message 2 .

For example, in the foregoing description of FIG. 2 , three different forms of service data are defined.

In the first form, different service data may come from different user-side devices, and ultimately access the same network-side device. Specifically, FIG. 5 is a third structural schematic diagram of the dual-homing protection system provided in this application. As shown in FIG. 5 , on the basis of FIG. 4 , the dual-homing protection system further includes another user-side device 501 and another PE device 502 . Another PE device 502 is connected to another user-side device 501 through a connection port. Another PE device 502 establishes two OTN pipes with the two PE devices. There is a one-to-one correspondence between two OTN pipes and two PE devices. The two PE devices are the second PE device 202 and the third PE device 203 respectively.

In the second form, different service data come from the same user-side device, and finally access different network-side devices. For example, as shown in FIG. 5 , on the basis of FIG. 4 , the dual-homing protection system further includes another network-side device 505 and two PE devices. The two PE devices are PE device 503 and PE device 504 . Another network side device 505 is respectively connected to the two connection ports of the two PE devices. The two PE devices respectively establish two OTN pipes with the first PE device 201 . There is a one-to-one correspondence between two OTN pipes and two PE devices.

For example, a dual-homing protection system also includes NCE. The NCE is used to create the first OVPN according to the aforementioned method. In addition to the first OTN pipe and the second OTN pipe, the first OVPN also includes a tunnel between the second PE device 202 and the third PE device 203 . Similarly, NCE can also be used to create another OVPN and/or a second OVPN. The second OVPN also includes a tunnel between the second PE device 202 and the third PE device 203 . When another OVPN includes the second PE device 202 and the third PE device 203 , the other OVPN also includes a tunnel between the second PE device 202 and the third PE device 203 . When another OVPN network includes two PE devices connected to the network side device 204, the other OVPN network also includes a tunnel between the two PE devices.

For example, the second PE device 202 determines whether the second channel is in a normal state through the second stage of BFD protocol detection. The third PE device 203 determines whether the third channel is in a normal state through the fourth segment of BFD protocol detection. The second PE device 202 determines whether the first OTN pipe is in a normal state through the first segment of the BFD protocol detection. The third PE device 203 determines whether the second OTN pipe is in a normal state through the third-stage BFD protocol detection.

The present application also provides another dual-homing protection system. Specifically, FIG. 6 is a fourth structural schematic diagram of the dual-homing protection system provided in this application. As shown in FIG. 6 , on the basis of FIG. 3 , the first PE device 201 includes a first sub-PE device 601 and a second sub-PE device 602 . The second PE device 202 establishes a first OTN pipe with the first sub-PE device 601 . A second OTN pipe is established between the third PE device 203 and the second sub-PE device 602 . A channel is also established between the first sub-PE device 601 and the second sub-PE device 602 . For example, port 7 of the first sub-PE device 601 and port 8 of the second sub-PE device 602 establish a fourth OTN pipe through the first hop. The first channel includes a first sub-channel and a second sub-channel. The first sub-PE device 601 and the user-side device 200 have established a first sub-channel. A second sub-channel is established between the second sub-PE device 602 and the user-side device 200 .

If the first sub-channel is in a normal state, the user-side device 200 may send the first forward service data to the first sub-PE device 601 through the first sub-channel. The first sub-PE device 601 is configured with a fourth forward primary route and a fourth forward standby route. The destination address of the fourth forward primary route and the fourth forward standby route is the IP address of the network side device 204 . The next hop of the fourth forward main route is the second PE device 202 . The next hop of the fourth forward backup route is the second sub-PE device 602 . After receiving the first forward service data, if the first OTN pipe is in a normal state, the first sub-PE device 601 is configured to send the first forward service data to the network side device 204 through the fourth forward main route. If the first OTN pipe is in an abnormal state, the first sub-PE device 601 is configured to send the first forward service data to the network side device 204 through the fourth forward standby route.

If the first sub-channel is in an abnormal state, the user-side device 200 may send the first forward service data to the second sub-PE device 602 through the second sub-channel. The second sub-PE device 602 is configured with a fifth forward primary route and a fifth forward standby route. The destination address of the fifth forward primary route and the fifth forward standby route is the IP address of the network side device 204 . The next hop of the fifth forward main route is the third PE device 203 . The next hop of the fifth forward standby route is the first sub-PE device 601 . After receiving the first forward service data, if the second OTN pipe is in a normal state, the second sub-PE device 602 is configured to send the first forward service data to the network side device 204 through the fifth forward main route. If the second OTN pipe is in an abnormal state, the second sub-PE device 602 is configured to send the first forward service data to the network side device 204 through the fifth forward standby route. Wherein, the fourth forward main route is also referred to as the first main route. The fifth forward primary route is also called the first backup route.

For the forward service data, please refer to the relevant description of the aforementioned FIG. In FIG. 5 , the next hop of the second reverse primary route of the second PE device 202 is the first sub-PE device 601 . The next hop of the second reverse backup route is the third PE device 203 . According to the foregoing description of FIG. 2 , if the second channel is in a normal state, the second PE device 202 is configured to receive reverse service data from the network side device 204 . After receiving the reverse service data, if the first OTN pipe is in a normal state, the second PE device is configured to send the reverse service data to the user side device 200 through the second reverse main route. If the first OTN pipe is in an abnormal state, the second PE device 202 is configured to send reverse service data to the user side device 200 through the second reverse standby route.

Similarly, the next hop of the third reverse primary route of the third PE device 203 is the second sub-PE device 602 . The next hop of the third reverse standby route is the second PE device 202 . According to the foregoing description of FIG. 2 , if the second channel is in an abnormal state, the third PE device 203 is used to receive reverse service data from the network side device 204 . After receiving the reverse service data, if the second OTN pipe is in a normal state, the third PE device is configured to send the reverse service data to the user side device 200 through the third reverse main route. If the second OTN pipe is in an abnormal state, the second PE device 202 is configured to send reverse service data to the user side device 200 through the third reverse standby route.

In practical applications, the first sub-PE device 601 may also be configured with a fourth reverse primary route and a fourth reverse backup route. The destination addresses of the fourth reverse main route and the fourth reverse backup route are the IP address of the user-side device 200 . The next hop of the fourth reverse main route is the user side device 200 . The next hop of the fourth reverse standby route is the second sub-PE device 602 . After receiving the reverse service data, if the first sub-channel is in a normal state, the first sub-PE device 601 is configured to send the reverse service data to the user-side device 200 through the fourth reverse main route. If the first sub-channel is in an abnormal state, the first sub-PE device 601 is configured to send reverse service data to the user-side device 200 through the fourth reverse backup route.

Similarly, the second sub-PE device 602 may also be configured with a fifth reverse primary route and a fifth reverse backup route. The destination address of the fifth reverse main route and the fifth forward backup route is the IP address of the user-side device 200 . The next hop of the fifth reverse main route is the user-side device 200 . The next hop of the fifth reverse standby route is the first sub-PE device 601 . After receiving the reverse service data, if the second sub-channel is in a normal state, the second sub-PE device 602 is configured to send the reverse service data to the user-side device 200 through the fifth reverse main route. If the second sub-channel is in an abnormal state, the second sub-PE device 602 is configured to send reverse service data to the user-side device 200 through the fifth reverse backup route.

It should be understood that the dual-homing protection system in FIG. 6 has a similar structure to the dual-homing protection systems in FIGS. 2 , 4 and 5 . Therefore, for the description in FIG. 6 , reference may be made to the descriptions in FIG. 2 , FIG. 4 and FIG. 5 .

The dual-homing protection system in this application is described above. The dual-homing protection method in this application is described below. Fig. 7 is a schematic flowchart of the dual-homing protection method provided in this application. As shown in Figure 7, the dual-homing protection method includes the following steps.

In step 701, the first PE device receives the first forward service data from the user-side device, a first OTN pipe is established between the first PE device and the second PE device, and the first OTN pipe is established between the first PE device and the third PE device. A second OTN pipe is established. A second channel is established between the second PE device and the network side device. A third channel is established between the third PE device and the network side device. The source address of the first forward service data is the IP address of the user-side device. The destination address of the first forward service data is the IP address of the network side device.

In step 702, if the first OTN pipe is in a normal state, the first PE device sends the first forward service data to the network side device through the first main route, and the next hop of the first main route is the second PE device. The destination address of the first main route is the IP address of the network side device.

In step 703, if the first OTN pipe is in an abnormal state, the first PE device sends the first forward service data to the network side device through the first standby route. The next hop of the second primary route is the third PE device. The destination address of the first backup route is the IP address of the network side device.

It should be understood that for the description of the dual-homing protection method, reference may be made to the foregoing description of the dual-homing protection system. For example, the first PE device determines whether the first OTN pipe is in a normal state through the BFD protocol. For example, the first OTN pipe and the second OTN pipe are OSU pipes. For example, the first PE device obtains the first primary route and the first backup route by extending the PCEP protocol. The first PE device receives the information of the first primary route from the second PE device. The first PE device receives information about the first backup route from the third PE device.

The dual-homing protection method in this application is described above, and the dual-homing protection device in this application is described below. FIG. 8 is a schematic structural diagram of a dual-homing protection device provided in this application. As shown in FIG. 8 , a dual-homing protection device 800 includes a receiving module 801 and a sending module 802 .

The dual-homing protection device 800 may be the first PE device 201 in the aforementioned dual-homing protection system. At this time, the receiving module 801 is configured to receive the first forward service data from the user side equipment. The dual-homing protection device and the second PE equipment establish a first optical transport network OTN pipe. A second OTN pipeline is established between the dual-homing protection device 800 and the third PE equipment. A second channel is established between the second PE device and the network side device. A third channel is established between the third PE device and the network side device. The sending module 802 is configured with a first primary route and a first backup route. The destination addresses of the first primary route and the first backup route are the IP addresses of the network side devices. The next hop of the first main route is the second PE device. The next hop of the first standby route is the third PE device. If the first OTN pipe is in a normal state, the sending module 802 sends the first forward service data to the network side device through the first main route. The sending module 802 is further configured to send the first forward service data to the network side device through the first standby route if the first OTN pipe is in an abnormal state.

The dual-homing protection device 800 may also be the second PE device 202 in the aforementioned dual-homing protection system. At this time, the receiving module 801 is configured to receive the first forward service data from the first PE device. A third OTN pipeline is established between the dual-homing protection device and the third PE equipment. A second channel is established between the dual-homing protection device and the network-side device. A third channel is established between the third PE device and the network side device. The sending module 802 is configured with a second forward primary route and a second forward standby route. The destination address of the second forward primary route and the second forward standby route is the IP address of the network side device. The next hop of the second forward main route is the network side device. The next hop of the second forward standby route is the third PE device. The sending module 802 is configured to send the first forward service data to the network side device through the second forward main route if the second channel is in a normal state. The sending module 802 is further configured to send the first forward service data to the network side device through the second forward standby route if the second channel is in an abnormal state.

It should be understood that for the description of the dual-homing protection device, reference may be made to the foregoing descriptions of the dual-homing protection system and the dual-homing protection method. Each module of the dual-homing protection device can also be used to perform all or part of the operations that can be performed by the first PE device 201 or the second PE device 202 in the aforementioned dual-homing protection system.

The dual-homing protection device in this application is described above, and the computer equipment in this application is described below. FIG. 9 is a schematic structural diagram of a computer device provided in this application. The computer device 900 in this application may be the first PE device or the second PE device. As shown in FIG. 9 , computer device 900 includes transceiver 902 and memory 903 .

Wherein, the transceiver 902 may be a wireless radio frequency module or an optical fiber transceiver module. Memory 903 may be volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. Wherein, the non-volatile memory may be a read-only memory (read-only memory, ROM), a programmable read-only memory (programmable ROM, PROM), an erasable programmable read-only memory (erasable PROM, EPROM) and the like. The volatile memory may be random access memory (RAM).

When the computer device 900 is the first PE device, the transceiver 902 is used to receive the first forward service data from the user side device. The first PE device and the second PE device establish a first OTN pipe. A second OTN pipe is established between the first PE device and the third PE device. A second channel is established between the second PE device and the network side device. A third channel is established between the third PE device and the network side device. The first primary route and the first backup route are stored in the memory 903 . The destination addresses of the first primary route and the first backup route are the IP addresses of the network side devices. The next hop of the first main route is the second PE device. The next hop of the first standby route is the third PE device. The transceiver 902 is further configured to send the first forward service data to the network side device through the first main route if the first OTN pipe is in a normal state. The transceiver 902 is further configured to send the first forward service data to the network side device through the first backup route if the first OTN pipe is in an abnormal state.

When the computer device 900 is the second PE device, the transceiver 902 is configured to receive first forward service data from the first PE device. A third OTN pipe is established between the second PE device and the third PE device. A second channel is established between the second PE device and the network side device. A third channel is established between the third PE device and the network side device. The memory 903 stores the second forward primary route and the second forward standby route. The destination address of the second forward primary route and the second forward standby route is the IP address of the network side device. The next hop of the second forward main route is the network side device. The next hop of the second forward standby route is the third PE device. The transceiver 902 is further configured to send the first forward service data to the network side device through the second forward main route if the second channel is in a normal state. The transceiver 902 is further configured to send the first forward service data to the network side device through the second forward standby route if the second channel is in an abnormal state.

In other examples, the computer device 900 also includes a processor 901 . The processor 901 may be a central processing unit (central processing unit, CPU), a network processor (network processor, NP) or a combination of CPU and NP. The processor 901 may further include a hardware chip or other general-purpose processors. The aforementioned hardware chip may be an application specific integrated circuit (ASIC), a programmable logic device (PLD) or a combination thereof. Computer programs executable by the processor 901 are stored in the memory 903 . When the processor 901 reads and executes the computer program, it can perform all or part of the operations that can be performed by the first PE device or the second PE device in the above-mentioned dual-homing protection system or dual-homing protection method.

The present application also provides a digital processing chip. The digital processing chip integrates circuits and one or more interfaces for realizing the functions of the processor 901 described above. When the memory is integrated in the digital processing chip, the digital processing chip can complete all or part of the operations that can be performed by the first PE device or the second PE device in the aforementioned dual-homing protection system or dual-homing protection method.

The above is only the specific implementation of the application, but the scope of protection of the application is not limited thereto. Anyone familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the application, and should cover Within the protection scope of this application.

Claims (28)

1. A dual-homing protection system is characterized in that it comprises:

   The first service provider edge PE device, the second PE device and the third PE device;

   A first optical transport network OTN pipe is established between the first PE device and the second PE device, a second OTN pipe is established between the first PE device and the third PE device, and the first A second channel is established between the second PE device and the network side device, and a third channel is established between the third PE device and the network side device;

   The first PE device is configured with a first primary route and a first backup route, the destination address of the first primary route and the first backup route is the Internet Protocol IP address of the network side device, and the first The next hop of the main route is the second PE device, and the next hop of the first standby route is the third PE device;

   The first PE device is configured to receive first forward service data from a user-side device;

   If the first OTN pipe is in a normal state, the first PE device is configured to send the first forward service data to the network side device through the first main route;

   If the first OTN pipe is in an abnormal state, the first PE device is configured to send the first forward service data to the network side device through the first standby route.
2. The system according to claim 1, wherein the second PE device is configured with a second forward main route and a second forward standby route, and the second forward main route and the second forward The destination address of the backup route is the IP address of the network side device, the next hop of the second forward primary route is the network side device, and the next hop of the second forward backup route is the first Three PE equipment;

   If the first OTN pipe is in a normal state, the second PE device is configured to receive the first forward service data from the user side device;

   If the second channel is in a normal state, the second PE device is configured to send the first forward service data to the network side device through the second forward main route;

   If the second channel is in an abnormal state, the second PE device is configured to send the first forward service data to the network side device through the second forward standby route.
3. The system according to claim 1, wherein the third PE device is configured with a third forward main route and a third forward standby route, and the third forward main route and the third forward The destination address of the backup route is the IP address of the network side device, the next hop of the third forward primary route is the network side device, and the next hop of the third forward backup route is the first Two PE equipment;

   If the first OTN pipe is in an abnormal state, the third PE device is configured to receive the first forward service data from the user side device;

   If the third channel is in a normal state, the third PE device is configured to send the first forward service data to the network side device through the third forward main route;

   If the third channel is in an abnormal state, the third PE device is configured to send the first forward service data to the network side device through the third forward standby route.
4. A system according to any one of claims 1 to 3, characterized in that,

   The second PE device is configured with a second reverse main route and a second reverse backup route, and the destination address of the second reverse main route and the second reverse backup route is the IP address of the user-side device address, the next hop of the second reverse primary route is the first PE device, and the next hop of the second forward backup route is the third PE device;

   If the second channel is in a normal state, the second PE device is used to receive reverse service data from the network side device;

   If the first OTN pipe is in a normal state, the second PE device is configured to send the reverse service data to the user-side device through the second reverse main route;

   If the first OTN pipe is in an abnormal state, the second PE device is configured to send the reverse service data to the user side device through the second reverse backup route.
5. A system according to any one of claims 1 to 3, characterized in that,

   The third PE device is configured with a third reverse main route and a third reverse backup route, and the destination address of the third reverse main route and the third forward backup route is the IP address of the user-side device address, the next hop of the third reverse primary route is the first PE device, and the next hop of the third forward standby route is the second PE device;

   If the second channel is in an abnormal state, the third PE device is used to receive reverse service data from the network side device;

   If the second OTN pipe is in a normal state, the third PE device is configured to send the reverse service data to the user-side device through the third reverse main route;

   If the second OTN pipe is in an abnormal state, the second PE device is configured to send the reverse service data to the user side device through the third reverse backup route.
6. The system according to claim 1, wherein if the first OTN pipe is in a normal state, the first PE device is configured to send the The above-mentioned first forward business data includes:

   If the first OTN pipe and the second channel are in a normal state, the first PE device is configured to send the first forward service data to the network side device through the first main route.
7. The system according to claim 6, characterized in that,

   The first PE device is further configured to receive first detection data from the second PE device, and confirm whether the second channel is in a normal state according to the first detection data.
8. A system according to any one of claims 1 to 7, characterized in that,

   The first PE device is further configured to receive information about the first main route from the second PE device;

   The first PE device is further configured to receive information about the first standby route from the third PE device.
9. A system according to any one of claims 1 to 8, characterized in that,

   The first PE device is further configured to detect whether the first OTN pipe is in a normal state through an OTN pipe state detection technology.
10. A system according to any one of claims 1 to 9, characterized in that,

    The first PE device being used to receive the first forward service data from the user side device includes:

    The first PE device is configured to receive the first forward service data from the user-side device through a first optical virtual private network OVPN;

    The first PE device is also configured with a second main route and a second backup route, the destination address of the second main route and the second backup route is the IP address of the network side device, and the second main route The next hop of the route is the third PE device, and the next hop of the second standby route is the second PE device;

    The first PE device is further configured to receive second forward service data from the user side device through the second OVPN;

    If the second OTN pipe is in a normal state, the first PE device is further configured to send the second forward service data to the network side device through the second main route;

    If the second OTN pipe is in an abnormal state, the first PE device is further configured to send the second forward service data to the network side device through the second standby route.
11. A dual-homing protection method is characterized in that it includes:

    The first service provider edge PE device receives the first forward service data from the user side device, the first PE device and the second PE device establish a first optical transport network OTN pipe, the first PE device and the third PE device A second OTN pipeline is established between the PE devices, a second channel is established between the second PE device and the network side device, and a third channel is established between the third PE device and the network side device;

    The first PE device is configured with a first primary route and a first backup route, the destination address of the first primary route and the first backup route is the Internet Protocol IP address of the network side device, and the first The next hop of the main route is the second PE device, and the next hop of the first backup route is the third PE device;

    If the first OTN pipe is in a normal state, the first PE device sends the first forward service data to the network side device through the first main route;

    If the first OTN pipe is in an abnormal state, the first PE device sends the first forward service data to the network side device through the first standby route.
12. The method according to claim 11, characterized in that,

    If the first OTN pipe is in a normal state, sending the first forward service data to the network side device by the first PE device through the first main route includes:

    If the first OTN pipe and the second channel are in a normal state, the first PE device sends the first forward service data to the network side device through the first main route.
13. The method according to claim 12, characterized in that the method further comprises:

    The first PE device receives first detection data from the second PE device;

    The first PE device confirms whether the second channel is in a normal state according to the first detection data.
14. A method according to any one of claims 11 to 13, wherein

    The first PE device receives the information of the first main route from the second PE device;

    The first PE device receives the information of the first backup route from the third PE device.
15. A method according to any one of claims 11 to 14, wherein

    The first PE device detects whether the first OTN pipe is in a normal state through an OTN pipe state detection technology.
16. A method according to any one of claims 11 to 15, wherein

    The receiving of the first forward service data by the first PE device from the user side device includes:

    The first PE device receives the first forward service data from the user-side device through a first optical virtual private network OVPN;

    The first PE device is also configured with a second main route and a second backup route, the destination address of the second main route and the second backup route is the IP address of the network side device, and the second main route The next hop of the route is the third PE device, and the next hop of the second standby route is the second PE device;

    The method also includes:

    The first PE device receives second forward service data from the user side device through the second OVPN;

    If the second OTN pipe is in a normal state, the first PE device sends the second forward service data to the network side device through the second main route;

    If the second OTN pipe is in an abnormal state, the first PE device sends the second forward service data to the network side device through the second standby route.
17. A dual-homing protection method is characterized in that it includes:

    The second service provider edge PE device receives the first forward service data from the first PE device, a third optical transport network OTN pipe is established between the second PE device and the third PE device, and the second PE device establishing a second channel with the network side device, and establishing a third channel between the third PE device and the network side device;

    The second PE device is configured with a second forward primary route and a second forward standby route, and the destination address of the second forward primary route and the second forward standby route is the IP address of the network side device address, the next hop of the second forward primary route is the network side device, and the next hop of the second forward standby route is the third PE device;

    If the second channel is in a normal state, the second PE device sends the first forward service data to the network side device through the second forward main route;

    If the second channel is in an abnormal state, the second PE device sends the first forward service data to the network side device through the second forward standby route.
18. The method according to claim 17, wherein a first OTN pipe is established between the first PE device and the second PE device, and a second OTN pipe is established between the first PE device and the third PE device. An OTN pipeline, where the first PE device and the user-side device establish a first channel;

    The second PE device is configured with a second reverse main route and a second reverse backup route, and the destination address of the second reverse main route and the second reverse backup route is the IP address of the user-side device address, the next hop of the second reverse primary route is the first PE device, and the next hop of the second forward backup route is the third PE device;

    The method also includes:

    The second PE device receives reverse service data from the network side device;

    If the first OTN pipe is in a normal state, the second PE device sends the reverse service data to the user-side device through the second reverse main route;

    If the first OTN pipe is in an abnormal state, the second PE device sends the reverse service data to the user side device through the second reverse backup route.
19. The method of claim 18, wherein,

    The second PE device is further configured to detect whether the first OTN pipe is in a normal state through an OTN pipe state detection technology.
20. The method according to any one of claims 18 to 19, further comprising:

    The second PE device receives information about the second reverse primary route from the first PE device;

    The second PE device receives information about the second forward backup route from the third PE device.
21. A dual-homing protection device, characterized in that it comprises:

    The receiving module is configured to receive the first forward service data from the user-side equipment, the dual-homing protection device and the second service provider edge PE equipment establish a first optical transport network OTN pipeline, the dual-homing protection device and the second service provider edge PE equipment A second OTN pipeline is established between the three PE devices, a second channel is established between the second PE device and the network side device, and a third channel is established between the third PE device and the network side device;

    A sending module, the sending module is configured with a first primary route and a first backup route, the destination addresses of the first primary route and the first backup route are the Internet Protocol IP address of the network side device, and the second A next hop of the primary route is the second PE device, and a next hop of the first backup route is the third PE device;

    The sending module is configured to send the first forward service data to the network side device through the first main route if the first OTN pipe is in a normal state;

    The sending module is further configured to send the first forward service data to the network side device through the first standby route if the first OTN pipe is in an abnormal state.
22. The device according to claim 21, characterized in that,

    The receiving module is further configured to receive information of the first main route from the second PE device;

    The receiving module is further configured to receive the information of the first backup route from the third PE device.
23. The device according to claim 21 or 22, wherein the device further comprises:

    The detection module is configured to detect whether the first OTN pipe is in a normal state through the OTN pipe state detection technology.
24. Apparatus according to any one of claims 21 to 23, characterized in that

    The receiving module is used to receive the first forward service data from the user side equipment including:

    The receiving module is configured to receive the first forward service data from the user-side device through a first optical virtual private network OVPN;

    The sending module is also configured with a second main route and a second backup route, the destination address of the second main route and the second backup route is the IP address of the network side device, and the second main route The next hop of the second standby route is the third PE device, and the next hop of the second standby route is the second PE device;

    The receiving module is further configured to receive second forward service data from the user-side device through the second OVPN;

    The sending module is further configured to send the second forward service data to the network side device through the second main route if the second OTN pipe is in a normal state;

    The sending module is further configured to send the second forward service data to the network side device through the second standby route if the second OTN pipe is in an abnormal state.
25. A dual-homing protection device, characterized in that it comprises:

    A receiving module, configured to receive first forward service data from a first service provider edge PE device, a third optical transport network OTN pipeline is established between the dual-homing protection device and the third PE device, and the dual-homing protection A second channel is established between the device and the network-side device, and a third channel is established between the third PE device and the network-side device;

    A sending module, the sending module is configured with a second forward main route and a second forward backup route, the destination addresses of the second forward main route and the second forward backup route are the IP address, the next hop of the second forward primary route is the network side device, and the next hop of the second forward standby route is the third PE device;

    The sending module is configured to send the first forward service data to the network side device through the second forward main route if the second channel is in a normal state;

    The sending module is further configured to send the first forward service data to the network side device through the second forward standby route if the second channel is in an abnormal state.
26. The device according to claim 25, wherein a first OTN pipe is established between the first PE device and the dual-homing protection device, and a second OTN pipe is established between the first PE device and the third PE device. An OTN pipeline, where the first PE device and the user-side device establish a first channel;

    The sending module is also configured with a second reverse main route and a second reverse backup route, and the destination address of the second reverse main route and the second reverse backup route is the IP address of the user-side device , the next hop of the second reverse primary route is the first PE device, and the next hop of the second forward standby route is the third PE device;

    The receiving module is also used to receive reverse service data from the network side device;

    The sending module is further configured to send the reverse service data to the user-side device through the second reverse main route if the first OTN pipe is in a normal state;

    The sending module is further configured to send the reverse service data to the user-side device through the second reverse standby route if the first OTN pipe is in an abnormal state.
27. The device according to claim 26, further comprising:

    The detection module is configured to detect whether the first OTN pipe is in a normal state through the OTN pipe state detection technology.
28. Apparatus according to any one of claims 26 to 27, characterized in that

    The receiving module is further configured to receive information of the second reverse main route from the first PE device;

    The receiving module is further configured to receive the information of the second forward backup route from the third PE device.

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