WO2020052687A1

WO2020052687A1 - Network element anti-looping method and apparatus, device, and readable storage medium

Info

Publication number: WO2020052687A1
Application number: PCT/CN2019/105948
Authority: WO
Inventors: 操新
Original assignee: 中兴通讯股份有限公司
Priority date: 2018-09-14
Filing date: 2019-09-16
Publication date: 2020-03-19
Also published as: CN110912815B; CN110912815A

Abstract

Disclosed are a network element anti-looping method and apparatus, a device, and a readable storage medium. The network element anti-looping method comprises: arranging a master node on an optical transport network network element, and arranging a master port on the master node; using the master port to send a loop detection packet according to a preset cycle; when a slave port corresponding to the master port receives the loop detection packet, setting the state of the slave port to a blocking state; when the slave port does not receive the loop detection packet, setting the state of the slave port according to whether the network transmitting the loop detection packet is interrupted.

Description

Network element anti-looping method, device, equipment and readable storage medium

Technical field

This article relates to the field of communication technology.

Background technique

With the continuous increase of service processing capabilities and different service types, in the application of OTN (Optical, Transport, Network) optical network elements, the cascading of master and slave subracks is more and more complicated. A single OTN network element includes a master subrack and multiple transmission slave subracks. Various data packets of the network element are transmitted on the master subrack and each slave subrack to complete the monitoring and management functions of the network element. . In addition, since the master and slave subracks are cascaded through their respective Layer 2 switching boards, the cascading method may be ring networking, chain networking, or star networking. Therefore, loops need to be prevented to avoid broadcast storms caused by cyclic transmission of unknown unicast and broadcast on the loop.

Summary of the Invention

A method for preventing loop formation of a network element according to an aspect of the present disclosure, the method for preventing loop formation of a network element includes: setting a master node on a network element of an optical transmission network, and setting a master port on the master node; The port sends a loop detection message according to a preset period; when the slave port corresponding to the master port receives the loop detection message, the state of the slave port is set to a blocked state; when the When the slave port does not receive the loop detection message, the state of the slave port is set according to whether the network transmitting the loop detection message is interrupted.

A network element anti-looping device provided by another aspect of the present disclosure, the network element anti-looping device includes: a setting module, configured to set a master node on an optical transport network element, and set the master node on the master node A master port; a sending module for sending a loop detection message to the master port at a preset period; an anti-looping module for receiving the loop detection message when a slave port corresponding to the master port receives the loop detection message Set the state of the slave port to a blocking state during the text; and set when the slave port does not receive the loop detection message, according to whether the network transmitting the loop detection message is interrupted The state of the slave port.

An electronic device is provided in another aspect of the present disclosure. The electronic device includes a memory and a processor. The memory stores an application program executable by the processor. The application program is stored in the processor. When executed, the processor executes the network element loop prevention method as described above.

A readable storage medium provided in still another aspect of the present disclosure stores a computer program thereon. When the computer program is executed by a processor, the processor executes the network element loop prevention method as described above.

BRIEF DESCRIPTION OF THE DRAWINGS

1 is a flowchart of a network element loop prevention method according to an embodiment of the present disclosure;

2 is a cascade diagram of a Layer 2 switching board of a master-slave subrack of an OTN device according to an embodiment of the present disclosure;

3 is a schematic diagram of a broken node of a slave node of an OTN device according to an embodiment of the present disclosure;

4 is a flowchart of step S40 of a network element loop prevention method according to an embodiment of the present disclosure;

5 is a schematic diagram of a transmission node initiating a link_down message according to an embodiment of the present disclosure;

6 is a schematic diagram of a slave port state transition according to an embodiment of the present disclosure;

7 is a flowchart of step S40 of a network element loop prevention method according to another embodiment of the present disclosure;

8 is a schematic diagram of a node initiating a link_up message according to an embodiment of the present disclosure;

FIG. 9 is a schematic diagram of a slave port state transition according to an embodiment of the present disclosure;

10 is a cascade diagram of a Layer 2 switching board of a master-slave subrack of an OTN device according to another embodiment of the present disclosure;

11 is an exemplary structural block diagram of a network element loop prevention device according to an embodiment of the present disclosure.

The realization, functional characteristics and advantages of the purpose of this article will be further described in conjunction with the embodiments and with reference to the drawings.

detailed description

In order to make the technical problems, technical solutions, and beneficial effects to be clearer and more clear in this article, the following further describes this article in detail with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this document and are not intended to limit this document.

FIG. 1 is a flowchart of a network element loop prevention method according to an embodiment of the present disclosure.

As shown in FIG. 1, the network element loop prevention method according to an embodiment of the present disclosure includes steps S10 to S40.

In step S10, a master node is set on an optical transport network (OTN) network element, and a master port is set on the master node.

In step S20, the master port sends a loop detection message according to a preset period.

In step S30, when the slave port corresponding to the master port receives the loop detection message, the state of the slave port is set to a blocked state.

In step S40, when the slave port does not receive the loop detection message, the state of the slave port is set according to whether the network transmitting the loop detection message is interrupted.

According to the embodiment of the present disclosure, when it is determined that the network transmitting the loop detection message is interrupted, the state of the slave port is set to an unblocked state; when it is determined that the network transmitting the loop detection message is not interrupted, The state of the slave port is maintained as a blocked state.

According to an embodiment of the present disclosure, when it is determined that the network transmitting the loop detection message returns to normal from an interrupted state, the state of the slave port is set to a blocked state.

According to an embodiment of the present disclosure, when the master node receives a message for indicating the network interruption, it determines that the network interruption. When the master node does not receive a message indicating that the network is interrupted, it is determined that the network is not interrupted.

According to the embodiment of the present disclosure, after determining that the network is interrupted, when the master node receives a message for instructing the network to recover from the interruption, it is determined that the network recovers from the interrupted state to normal.

According to an embodiment of the present disclosure, when the network is interrupted, the nodes on both sides of the failure point of the network interruption send the message for indicating the network interruption to the master node, and when the network slave When the interrupted state returns to normal, the nodes on both sides of the failure point of the network interruption send the message for instructing the network to recover from the interrupted state to the master node.

According to the embodiment of the present disclosure, it is determined whether a loop exists in the network by sending a loop detection packet cyclically. If there is a loop (that is, the slave port corresponding to the master port can receive the loop detection report sent by the master port). (Text), the state of the port will be set to the blocked state for ring break processing, avoiding broadcast storms caused by loops, and has the characteristics of fast convergence, high stability, and strong maintainability.

According to the embodiment of the present disclosure, the OTN network element is composed of one or more sub shelves. Each sub shelf is distinguished by a sub shelf ID value. The ID value of the master sub shelf is 1. The ID value of the slave sub shelf is 2-127. The primary Layer 2 switching board on the master node is the master node, and the backup Layer 2 switching board on the master subrack is the slave node. If there is only one Layer 2 switching board in the main subrack, there are no slave nodes. All Layer 2 switching boards on the slave shelf are collectively referred to as transit nodes.

In current OTN equipment. The ubiquitous and common industry-used MSTP (Multi-Service Transfer Platform) protocol is used. This protocol is more stable in the use of complex Layer 2 networking scenarios, and various types of networking prevent loops. Ability is strong, but there are some technical disadvantages, such as the slow convergence speed of the protocol, the calculation of the protocol algorithm is complicated, the troubleshooting is difficult, and the after-sales maintenance is difficult. However, the current WDM equipment networking is relatively single. For a network element, there is usually only one or more master-slave sub-cascades. In this case, the maintenance cost of using the MSTP protocol is undoubtedly enlarged.

The embodiments of the present disclosure are mainly directed to a single ring scenario in an OTN device. In this embodiment, the master-slave sub-racks include two-layer switching boards, and the master-slave sub-racks are cascaded through the two-layer boards. In this case, it is necessary to avoid the problem of broadcast storm caused by loops when these two layer boards are cascaded.

According to an embodiment of the present disclosure, the network element includes one master subrack and several slave subracks.

Step 10 of the network element loop prevention method according to an embodiment of the present disclosure will be described in detail below with reference to FIG. 2. FIG. 2 is a cascade diagram of a Layer 2 switching board of a master-slave subrack of an OTN device according to an embodiment of the present disclosure.

As shown in FIG. 2, when the main subrack includes the active and standby Layer 2 switching boards, the active Layer 2 switching board (board 1 shown in FIG. 2) is used as the master node, and the standby Layer 2 switching is performed. A single board (single board 8 shown in FIG. 2) is used as a slave node; a port (for example, a panel network port or a panel optical port) on the master node is set as a master port, and a port on the slave node is set (For example, the panel network port or the panel optical port) is set as the slave port.

Although FIG. 2 shows that the main subrack includes the active and standby Layer 2 switching boards, the main subrack may include only a single Layer 2 switching board, that is, it does not include the standby Layer 2 switching board. In this case, set a single Layer 2 switching board on the master subrack as the master node, set one port on the master node as the master port, and set another port on the master node that is different from the master port as the slave port. . For example, a small-numbered panel network port or panel optical port on the master node can be set as the master port, and a large-numbered panel network port or panel optical port on the master node can be set as the slave port.

According to the embodiment of the present disclosure, after step S10 and before step S20, the method further includes: constructing a first virtual local area network and a second virtual local area network on all subracks, where the first virtual local area network is used to transmit and exchange service data. Processing; the second virtual local area network is used to monitor and manage data transmission and exchange processing.

According to an embodiment of the present disclosure, the first virtual local area network enables a ring network blocking mechanism; the second virtual local area network does not enable a ring network blocking mechanism.

According to an embodiment of the present disclosure, the second virtual local area network is a network that transmits the loop detection message.

According to the embodiment of the present disclosure, taking the networking shown in FIG. 2 as an example, when the slave port corresponding to the master port receives the loop detection packet, it indicates that a loop exists in the current networking environment. You need to perform a loop-break process. For example, as shown in FIG. 3, the state of the slave port is set to a block state. If the loop detection packet is not sent from the master port after being sent out from the master port of the master node, it means that there is no loop in the current networking environment, and the slave port state needs to be adjusted to the forword state. .

The process of setting the status of the slave port when the network transmitting the loop detection message is interrupted will be described in detail below with reference to FIG. 4.

As shown in FIG. 4, in this embodiment, the process includes steps S41 and S42.

In step S41, when a failure point occurs in the second virtual local area network, the transmission nodes on both sides of the failure point initiate a link_down message through the second virtual local area network.

According to an embodiment of the present disclosure, the link_down message is a message for indicating a network interruption.

FIG. 5 is a schematic diagram of a transmission node initiating a link_down message according to an embodiment of the present disclosure. As shown in FIG. 5, the transmission link is faulty. The transmission nodes on both sides of the failure point are

nodes

4 and 5, and the two nodes actively send link_down packets to the opposite directions. In step S42, when the master node receives the link_down message, the state of the slave port is set to the forword state.

6 is a schematic diagram of a state transition of a slave port according to an embodiment of the present disclosure. As shown in FIG. 6, when the master node receives the lind_down message, the state of the slave port of the slave node changes, that is, the slave port of the slave node The state is changed from the block state shown in FIG. 5 to the forword state.

According to the embodiment of the present disclosure, the transmission link of the network element is a chain network. When a transmission link fails, the chain network is interrupted. In order to avoid interruption of the services carried by the chain network, the state of the slave port Changing from a blocked state to an unblocked state allows the chain network to unblock in the other direction.

The process of setting the state of the slave port when the network transmitting the loop detection message returns to the normal state from the interrupted state will be described in detail below with reference to FIG. 7.

As shown in FIG. 7, the process includes steps S43 and S44 subsequent to step S42 in addition to steps S41 and S42 shown in FIG. 4.

In step S43, when the failure point returns to normal, the transmission nodes on both sides of the failure point initiate a link_up message through the second virtual local area network.

According to the embodiment of the present disclosure, the link_up message is a message for instructing the network to recover from the interrupted state.

FIG. 8 is a schematic diagram of a transmission node initiating a link_up message according to an embodiment of the present disclosure. As shown in FIG. 8, when the fault point recovers,

nodes

4 and 5 actively send link_up messages to opposite directions, respectively.

In step S44, when the master node receives the link_up message, the state of the slave port is set to the block state.

FIG. 9 is a schematic diagram of a state transition of a slave port according to an embodiment of the present disclosure. As shown in FIG. 9, when the master node receives the link_up packet, the state of the slave port transitions, that is, the state of the slave port is as shown in FIG. The unblocked state shown in 8 is changed to the block state.

According to the embodiments of the present disclosure, when the point of failure returns to normal, if the state of the slave port remains unblocked, the transmission link will change from a chain network to a ring network, making it easy to cause a broadcast storm in the ring network. To avoid this risk, the state of the slave port is changed to the block state, so that the transmission link can be maintained as a chain network.

The preset period in step S20 of the network element loop prevention method according to the embodiment of the present disclosure is any time period within 10 ms to 50 ms, for example, 30 ms. According to the embodiment of the present disclosure, a technology of determining whether a loop exists in a network by using a looped loop detection packet detection mechanism, and by using a link_down packet to determine whether a fault occurs in the network, realizes dual ring network detection. In addition, both the loop detection message and the link_down message can be sent and transmitted at the millisecond level. This enables fast link switching and ensures that service data is switched at the millisecond level.

FIG. 10 is a cascade diagram of a Layer 2 switching board of a master-slave subrack according to another embodiment of the present disclosure.

As shown in Figure 10, the OTN network element consists of a master subrack and three slave subracks. The master subrack uses a single Layer 2 switching board, and the slave subrack uses the active and standby Layer 2 switching boards. Each layer 2 The board has two panel cascade optical ports and one active-standby communication port (the active-standby communication interface is not shown in Figure 10).

According to the embodiment of the present disclosure, the layer 2 switching board on the main subrack on the OTN network element is designated as the master node. Because there is no standby Layer 2 switching board in this master subrack, no slave node is set, and optical port 1 on the master node is set as the master port, and optical port 2 is set as the slave port.

A first virtual local area network and a second virtual local area network are constructed on all sub shelves. The first virtual local area network is used to transmit and exchange business data. The local area network enables a ring network blocking mechanism. The second virtual local area network is used for data The transmission and exchange processing are monitored and managed. The LAN does not use the ring network blocking mechanism.

The master port on the master node sends a loop detection message to the outside, and the message interval is sent every 30ms, and the message is transmitted in the second virtual local area network.

Refer to "Stable state 1" on the left side of Figure 10. When the network is stable, the loop detection packet sent by the master port is transmitted in the network ring. After being forwarded by each transmission node, the master node will finally receive it through the slave port. To the message. In this case, the master node considers that there is a loop in the current network. At this time, the state of the slave port is set to the block state, so that the ring network is changed to a chained network to prevent loops.

Referring to "failure state 2" in the middle of FIG. 10, if the transmission node has an abnormal link disconnection in the link at time T0, the transmission link is interrupted. When the transmission nodes on both sides of the failure point detect a change in the state of the communication link port, they actively initiate a link_down message in the second virtual local area network. When the master node receives a link_down message from any node, it will change the state of the slave port from the block Switch to the forword state to form a new message sending path.

Referring to "Restoring Stable State 3" on the right in Figure 10, when the faulty node returns to normal at time T1 and the link returns to normal, the transmission nodes on both sides of the fault point detect a change in the state of the communication link port, and then in the second In the virtual local area network, a link_up message is actively initiated. When the master node receives a link_up message from any node, it will switch the state of the slave port from the forword state to the block state. The ring network formed by the state of the slave port will be switched to the block state. Switch to a chained network to prevent broadcast storms on the recovered ring network. At this point, the device returns to the stable state before the failure.

FIG. 11 is an exemplary structural block diagram of a network element loop prevention device according to an embodiment of the present disclosure.

As shown in FIG. 11, the network element loop prevention device includes a setting module 10, a sending module 20, and a loop prevention module 30.

A setting module 10 is configured to set a master node on an OTN network element, and set a master port on the master node.

The sending module 20 is configured to cause the master port to send a loop detection message according to a preset period.

The anti-loop formation module 30 is configured to set the state of the slave port to the block state when the slave port corresponding to the master port receives the loop detection packet; When the loop detection message is not received, the state of the slave port is set according to whether the network transmitting the loop detection message is interrupted.

According to an embodiment of the present disclosure, when the loop prevention module 30 determines that the network transmitting the loop detection packet is interrupted, the state of the slave port is set to an unblocked state; when the loop prevention module 30 determines to transmit the loop When the network of the road detection message is not interrupted, the state of the slave port is maintained in a bit-blocking state.

According to an embodiment of the present disclosure, when the loop prevention module 30 determines that the network transmitting the loop detection message returns to normal from an interrupted state, the state of the slave port is set to a blocked state.

According to an embodiment of the present disclosure, when the master node receives a message for indicating the network interruption, the loop prevention module 30 determines the network interruption. When the master node does not receive a message indicating that the network is interrupted, the loop prevention module 30 determines that the network is not interrupted.

According to the embodiment of the present disclosure, after determining that the network is interrupted, when the master node receives a message for instructing the network to recover from the interruption, it determines that the network recovers from the interrupted state to normal.

According to the embodiment of the present disclosure, it is determined whether a loop exists in the network by sending loop detection packets cyclically. If there is a loop, the state of the port is set to a blocked state for loop breaking processing, which avoids loops. The broadcast storm has the characteristics of fast convergence, high stability, and strong maintainability.

According to the embodiment of the present disclosure, the OTN network element is composed of one or more sub shelves. Each sub shelf is distinguished by a sub shelf ID value. The ID value of the master sub shelf is 1. The ID value of the slave sub shelf is 2-127. The primary Layer 2 switching board on the master is the primary node, and the secondary Layer 2 switching board on the primary subrack is the slave node. If the primary subrack has only a single Layer 2 switching board, there is no secondary node; all Layer 2 on the secondary subrack. Switching boards are collectively called transmission nodes.

According to an embodiment of the present disclosure, there is provided an electronic device including a memory and a processor. The memory stores an application program executable by the processor, and when the application program is executed by the processor, A method for preventing loop prevention of a network element according to an embodiment of the present disclosure is implemented, for example, with reference to the method for loop prevention of a network element described with reference to FIGS. 1 to 10.

An embodiment according to the present disclosure provides a readable storage medium having stored thereon a computer program that, when executed by a processor, implements a network element anti-looping method according to an embodiment of the present disclosure, for example, see FIGS. 1 to The network element anti-looping method described in FIG. 10.

It should be noted that the above device, device, and readable storage medium embodiment and method embodiment belong to the same concept. For the detailed implementation process, see the method embodiment, and the technical features in the method embodiment are correspondingly applicable in the device embodiment. I wo n’t repeat them here.

According to the network element anti-looping method, device, device and readable storage medium according to the embodiments of the present disclosure, it is possible to determine whether a loop exists in the network by sending loop detection packets cyclically, and perform loop-break processing if it exists to avoid The broadcast storm caused by the loop has the characteristics of fast convergence, high stability and strong maintainability. At the same time, the link_down message is used to determine whether a fault occurs in the network, and double-ring network detection is implemented.

Those of ordinary skill in the art can understand that all or some of the steps, systems, and functional modules / units in the devices disclosed in the methods above can be implemented as software, firmware, hardware, and appropriate combinations thereof.

In a hardware implementation, the division between functional modules / units mentioned in the above description does not necessarily correspond to the division of physical components. For example, a physical component may have multiple functions, or a function or step may be performed in cooperation by several physical components. Some or all physical components can be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit . Such software may be distributed on computer-readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). As is known to those of ordinary skill in the art, the term computer storage medium includes volatile and non-volatile implemented in any method or technology used to store information such as computer-readable instructions, data structures, program modules or other data. Removable, removable and non-removable media. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or may Any other medium used to store desired information and which can be accessed by a computer. In addition, it is well known to those of ordinary skill in the art that a communication medium typically contains computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transmission mechanism, and may include any information delivery medium .

The embodiments of the present disclosure have been described above with reference to the accompanying drawings, and thus do not limit the scope of rights of the present disclosure. Any modification, equivalent replacement, and improvement made by those skilled in the art without departing from the scope and substance of the present disclosure shall fall within the scope of rights of the present disclosure.

Claims

A network element anti-looping method includes:

Setting a master node on the optical transport network element, and setting a master port on the master node;

Enabling the master port to send a loop detection message according to a preset period;

When the slave port corresponding to the master port receives the loop detection message, the state of the slave port is set to a blocked state;

When the slave port does not receive the loop detection message, the state of the slave port is set according to whether the network transmitting the loop detection message is interrupted.
The method for preventing loop formation of a network element according to claim 1, wherein the optical transmission network element includes a master sub-frame and at least one slave sub-frame, and the master node is set on the optical transmission network element, and The master port setting on the master node includes:

When the main subrack includes a main Layer 2 switching board and a standby Layer 2 switching board, set the main Layer 2 switching board as the master node, and set the standby Layer 2 switching board as the slave node; One port on the master node is set as the master port, and one port on the slave node is set as the slave port;

When the main subrack includes a single Layer 2 switching board, set the single Layer 2 switching board as the master node; set a port on the master node as the master port, and set the master The other port on the node is set as the slave port.
The method for preventing loop formation of a network element according to claim 2, after setting a master node on the optical transmission network element, setting a master port on the master node, and sending a ring on the master port according to a preset period Before the road detection message, it includes:

Constructing a first virtual local area network and a second virtual local area network on the optical transport network element, the first virtual local area network is used for transmission and exchange processing of service data, and the second virtual local area network is used for data transmission, Exchange processing for monitoring management.
The method for preventing loop formation of a network element according to claim 3, wherein the second virtual local area network is the network transmitting the loop detection message.
The method for preventing loop formation of a network element according to claim 1, wherein setting the status of the slave port according to whether a network transmitting the loop detection message is interrupted comprises:

When it is determined that the network is interrupted, setting the state of the slave port to an unblocked state;

When it is determined that the network is not interrupted, the state of the slave port is maintained as a blocked state.
The network element loop prevention method according to claim 5, wherein:

When the master node receives a message for indicating the network interruption, determining that the network interruption,

When the master node does not receive a message indicating that the network is interrupted, it is determined that the network is not interrupted.
The method for preventing loop formation of a network element according to claim 5, wherein when it is determined that the network recovers from an interrupted state, the state of the slave port is set to a blocked state.
The method for preventing loop formation of a network element according to claim 7, wherein when the master node receives a message for instructing the network to recover from the interrupted state, it is determined that the network recovers from the interrupted state to normal.
The method for preventing loop formation of a network element according to claim 6, wherein when the network is interrupted, the nodes on both sides of the failure point of the network interrupt send the master node to indicate the network interruption Message.
[Corrected under Rule 91. 29.11.2019]
The method for preventing loop formation of a network element according to claim 8, wherein when the network recovers from an interrupted state, the nodes on both sides of the point of failure of the network interruption send the instruction to the master node for the The network resumes normal messages from the interrupted state.
[Corrected under Rule 91. 29.11.2019]
The method for preventing loop formation of a network element according to claim 1, wherein the preset period is any time period within 10ms to 50ms.
[Corrected under Rule 91. 29.11.2019]
A network element anti-looping device includes:

A setting module, configured to set a master node on a network element of the optical transmission network, and set a master port on the master node;

A sending module, configured to enable the master port to send a loop detection message according to a preset period;

An anti-looping module, configured to set the state of the slave port to a blocked state when the slave port corresponding to the master port receives the loop detection message; and When the loop detection message is received, the state of the slave port is set according to whether the network transmitting the loop detection message is interrupted.
[Corrected under Rule 91. 29.11.2019]
An electronic device includes a memory and a processor, and the memory stores an application program that can be executed by the processor. When the application program is executed by the processor, the processor executes the method of claim 1 The network element loop prevention method according to any one of -11.
[Corrected under Rule 91. 29.11.2019]
A readable storage medium stores a computer program thereon. When the computer program is executed by a processor, the processor executes the network element loop prevention method according to any one of claims 1-11.