WO2013040927A1

WO2013040927A1 - Method and device for distributed link aggregation

Info

Publication number: WO2013040927A1
Application number: PCT/CN2012/077842
Authority: WO
Inventors: 范汇华; 曹皖明; 喻敬海; 魏月华; 敖婷; 吴少勇; 郝红杰
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-09-20
Filing date: 2012-06-29
Publication date: 2013-03-28
Also published as: CN103023814A

Abstract

Disclosed are a method and device for distributed link aggregation. The method comprises: obtaining a unified distributed link aggregation system identity (ID) of a plurality of devices at a local end; sending the distributed link aggregation system ID to a peer end, and performing a distributed link aggregation negotiation with the peer end according to the distributed link aggregation system ID. By means of the present invention, link aggregation of the distributed link aggregation system may be implemented.

Description

The present invention relates to the field of communications, and in particular to a distributed link aggregation method and apparatus. BACKGROUND Link aggregation is the combination of two or more data channels into a single channel that appears as a single, higher bandwidth logical link. In theory, after link aggregation, the bandwidth of the logical link will increase by about N-1 times (N is the number of aggregated channels). Moreover, since only one link of the N links can work normally, the entire logical link can work, so the reliability of the aggregated logical link can be greatly improved. LACP (Link Aggregation Control Protocol) is a protocol that implements dynamic link aggregation and de-aggregation based on the IEEE802.3ad standard. Generally, the LACP protocol passes the Link Aggregation Control Protocol Data Unit (LACPDU). The road aggregation control protocol data unit) interacts with the peer. At present, as users and operators have higher requirements for the reliability of transmission channels, distributed link aggregation technology emerges as the times require. The principle of distributed link aggregation is to chain between multiple devices and multiple devices. Road aggregation to achieve link-level redundancy backup and increase bandwidth. For example, Figure 1 shows the link aggregation of a single rack. Figure 2 shows the link aggregation of six racks. In Figure 2, PE1, PE2, and PE3 are virtualized into one local device, and PE34, PE5, and PE6 are virtualized into a pair. End device. However, distributed link aggregation technology is still in the stage of theoretical research and discussion, and the obstacles of some technical factors have not yet matured in practice. In the distributed link aggregation technology, the most important technical factor is that the local and the peer need to use a unified distributed link aggregation system identifier when the local end and the peer end are distributed. ID) can be aggregated for aggregation to succeed. For example, the local end can be multiple devices, but in the view of the peer device, the local end should be a device, so that the link aggregation conditions are met. In the LACP protocol, the link aggregation system identifier (System ID) is used to uniquely identify a link aggregation group. Therefore, multiple devices on the local end need to use the same system ID for LACP negotiation. The System ID contains the System MAC and System Priority. Most system MACs use the device rack MAC and the system priority is configurable. For multiple devices, the system ID of each device is different from the normal one. This causes the local or remote device to use a unified distributed link aggregation system ID, but it is still in the theoretical discussion stage. The corresponding solution is not given in the distributed link aggregation technology, which leads to the failure of distributed link aggregation. SUMMARY OF THE INVENTION In view of the problem that distributed link aggregation cannot be implemented in the prior art, the present invention provides a distributed link aggregation method and apparatus to solve at least the above problems. According to an aspect of the present invention, a distributed link aggregation method is provided, including: acquiring a unified distributed link aggregation system identifier (ID) of multiple devices of the local end; and transmitting the distributed link aggregation system ID to The peer end performs distributed link aggregation negotiation with the peer according to the distributed link aggregation system ID. Preferably, the unified distributed link aggregation system ID of the multiple devices of the local end is obtained, including: configuring the same system ID for multiple devices of the local end; and using the same system ID as the distributed link aggregation system ID. Preferably, the same system ID is configured for multiple devices of the local end, including: configuring the media access control (MAC) of the same system and the priority of the same system for multiple devices of the local end; and the MAC of the same system and the same The priority of the system is the same as the system ID. Preferably, the unified distributed link aggregation system ID of the multiple devices of the local device is obtained, including: selecting one primary device among the multiple devices at the local end; sending the first notification message carrying the system ID of the primary device If the other device successfully receives the first notification packet, the distributed chain is determined according to the system ID of the primary device carried in the first notification packet. Road aggregation system ID. Preferably, the first notification message further includes: a flag for configuring a distributed link aggregation system ID; after the other device successfully receives the first notification message, parsing the first notification message, and configuring the distributed link aggregation system ID according to the configuration The flag of the master device is the distributed link aggregation system ID of the master device; the distributed link aggregation system ID of all devices of the local device is updated to the system ID of the master device, and the system ID of the master device is used as Distributed link aggregation system ID of all devices on the local end. Preferably, the unified distributed link aggregation system ID of the multiple devices of the local device is obtained, including: each device of the local device sends a system ID with its own system ID to its neighboring devices. And the neighboring device receives the second notification message, and performs a selection decision on the system ID carried in the second notification message and the system ID of the neighboring device according to the preset decision rule, and determines a system that meets the decision rule. ID, where the decision rule is to select the maximum or minimum value of the system ID; after all the devices on the local end make a selection decision, determine the maximum system ID or the minimum system ID owned by all devices on the local end as the distributed link aggregation system ID. . Preferably, all the devices at the local end make a selection decision, including: performing a second packet notification between each of the multiple devices of the local device. According to another aspect of the present invention, a distributed link aggregation apparatus is provided, including: an obtaining module, configured to acquire a unified distributed link aggregation system identifier (ID) of a plurality of devices of the local end; a negotiation module, setting To send the distributed link aggregation system ID to the peer, perform distributed link aggregation negotiation with the peer according to the distributed link aggregation system ID. Preferably, the obtaining module comprises: a configuration unit configured to configure the same system ID for the plurality of devices of the local end; and the determining unit is configured to use the same system ID as the distributed link aggregation system ID. Preferably, the obtaining module includes: a selected unit, configured to select one of the plurality of devices at the local end; the first sending unit is configured to send the first notification message carrying the system ID of the primary device to the local The determining device is configured to determine, according to the system ID of the master device carried in the first notification message, that the other device successfully receives the first notification message, Distributed Link Aggregation System ID. Preferably, the obtaining module includes: a second sending unit, configured to send a second notification message carrying the system ID of the device to a neighboring device adjacent to each device; and the determining unit is configured to receive the second notification message And determining, according to a preset decision rule, a system ID carried in the second notification message and a system ID of the neighboring device, and determining a system ID that meets the decision rule, where the decision rule is a maximum value of the selected system ID. Or the minimum value; the determining unit is configured to determine the maximum system ID or the minimum system ID owned by all devices on the local end as the distributed link aggregation system ID after all the devices on the local end make a selection decision. The present invention provides a unified distributed link aggregation system identifier at the local end or the opposite end, which solves the problem that the theoretical distributed link aggregation technology is different because the system identifiers of the local devices on the local end or the opposite end are different. The problem that distributed link aggregation cannot be implemented due to distributed link aggregation negotiation with the peer end can achieve the effect of distributed link aggregation. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, In the drawings: FIG. 1 is a schematic diagram of link aggregation performed by two switches according to the related art; FIG. 2 is a schematic diagram of link aggregation performed by six switches (distributed link aggregation networking) according to the related art; Is a flowchart of a distributed link aggregation method according to an embodiment of the present invention; 4 is a flow chart of forming a distributed link aggregation system ID by means of a communication by a selected master device to inform other devices according to an embodiment of the present invention; FIG. 5 is a dynamic negotiation form distribution of communication modes according to an embodiment of the present invention; FIG. 6 is a structural block diagram of a distributed link aggregation apparatus according to an embodiment of the present invention; FIG. 7 is a structural block diagram of a preferred distributed link aggregation apparatus according to an embodiment of the present invention; FIG. 8 is a structural block diagram of another preferred distributed link aggregation apparatus according to an embodiment of the present invention; FIG. 9 is a structural block diagram of still another preferred distributed link aggregation apparatus according to an embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. FIG. 3 is a flowchart of a distributed link aggregation method according to an embodiment of the present invention. As shown in FIG. 3, the flow mainly includes the following steps (step S302-step S304). Step S302: Obtain a unified distributed link aggregation system identifier ID of multiple devices of the local end. Step S304: Send the distributed link aggregation system ID to the peer end, and perform distributed link aggregation negotiation with the opposite end according to the distributed link aggregation system ID. In step S302, one of the ways to obtain the unified distributed link aggregation system ID of the multiple devices of the local end is: first, configure the same system ID for multiple devices of the local end, and then use the same system ID as the distributed chain. The system ID of the device is configured to implement the unified distributed link aggregation system ID of all devices on the local end. The configuration of the same system ID for multiple devices corresponding to the local end may include: configuring the media access control (MAC) of the same system and the priority of the same system for multiple devices of the local end, and the MAC of the same system and the same The priority of the system is the same as the system ID. Preferably, the second method for obtaining the unified distributed link aggregation system ID of the multiple devices of the local device is: first, selecting one of the plurality of devices at the local end, and carrying the first system ID of the primary device The notification message is sent to the other device of the local device, except for the device other than the master device, and the system ID of the master device carried in the first notification message is determined according to the case that the other device successfully receives the first notification message. Determine the distributed link aggregation system ID. The first notification message further includes: a flag for configuring a distributed link aggregation system ID, when other settings After receiving the first notification packet, the device first parses the first notification packet, and then uses the system ID of the primary device as its distributed link aggregation system ID according to the flag of the distributed link aggregation system ID. The system ID of the master device is the system ID of the master device. The system ID of the master device is the distributed link aggregation system ID of all devices on the local device. Preferably, the third way of obtaining the unified distributed link aggregation system ID of the multiple devices of the local end is that each of the multiple devices of the local end sends the system carrying its own to the neighboring devices adjacent thereto. The second notification message of the ID, the neighboring device receives the second notification message, and performs a selection decision on the system ID carried in the second notification message and the system ID of the neighboring device according to the preset decision rule, and determines the compliance decision. The system ID of the rule, where the decision rule is to select the maximum or minimum value of the system ID. After all the devices on the local end make a selection decision, determine the maximum system ID or the minimum system ID owned by all devices on the local end as the distributed link. Aggregate system ID. It should be noted that the selection decision is made on all devices of the local device, and the second message notification is performed between each of the multiple devices on the local device. For example, in the actual application, the foregoing three methods for obtaining the ID of the distributed link aggregation system may be specifically as follows: In the first mode, the manual configuration mode is adopted. In this mode, the system MAC and system priority of all devices can be manually configured. The system MAC and system priority can be configured to be the same. The same system MAC and the same system priority form the same system. ID (System ID). Therefore, the system IDs of the negotiation devices of all the distributed link aggregation systems of the local end must be configured to be the same system ID. Of course, for the implementation, the negotiation devices of all the distributed link aggregation systems of the opposite end can also be used. The system IDs of the devices on the local device are not associated with the system IDs of all devices on the peer device. The system IDs of all devices on the local device and the system IDs of all devices on the peer device are mutually related. Independently, of course, it can be the same. For the local or peer, each negotiation device uses the same system ID configured as the distributed link aggregation system ID to perform distributed link aggregation. Negotiation. In the second mode, by selecting the master device, the master device notifies the other device of the system ID communication, so that all devices of the local device receive the system ID of the master device, and the system ID is determined as the distributed link aggregation system ID. . In this mode, after a communication link is established between each device by specifying a system ID of a master device, the master device sends a message to inform the neighbor device, and the neighbor device receives the master device ID. The system ID of the master device in the packet is obtained and used as the system ID of the distributed link aggregation. The packet is forwarded to the neighbor device. In this way, all devices on the local end can use the system ID configured by the primary device as the system ID of the distributed link aggregation. In the third mode, the system ID of the distributed link aggregation is determined through the dynamic negotiation communication mode. In this mode, a communication link needs to be established first between multiple devices at the local end. Here, a specific communication link establishment method can be established. A Layer 2 link can also be established, so that adjacent devices can communicate with each other. Specifically, each device advertises its own system ID to the neighboring device. After receiving the packet, the neighboring device makes a decision according to the system ID in the packet and the ID of the device, and the system ID obtained after the decision is The packet is sent to its neighbors. The system ID is determined by a certain rule. The rule is pre-configured. For example, the minimum system MAC and the minimum system priority in the device can be used as distributed. The system ID of the link aggregation can also be the system ID of the distributed link aggregation. The maximum system MAC address and the maximum system priority in the device can also be used. Generally, a stable time threshold can be set. If the system ID of all device decisions does not change within the threshold time, the distributed system ID has been determined and can be used for distributed link aggregation. The above mode 2 and mode 3 will be described in detail below with reference to FIGS. 4 and 5. 4 is a flow chart of forming a distributed link aggregation system ID by means of a communication by a selected master device to notify other devices to be configured according to an embodiment of the present invention. As shown in FIG. 4, the flow includes the following steps.

S402, initialize, establish a communication link between the devices, and select one of the devices as the master device, and then go to S404.

S404. Determine whether the device is a master device. If yes, go to S406, otherwise go to S408. S406, the device is a master device, and the system ID of the device is used as the system ID of the distributed link aggregation, and the system ID is configured to send the system ID to the other device. In this embodiment, the transmission period is selected to be 3 seconds. S404.

S408: The non-master device determines whether the system ID configuration packet sent by the master device is received. If yes, go to S410, otherwise go to S412. S410: Receive a system ID configuration packet sent by the master device, parse the packet, set the distributed link aggregation system ID of the device to the configuration system ID in the packet, and forward the received packet to the other device. The device goes to S408 to continue to judge whether the packet is received.

S412: After receiving the system ID configuration packet sent by the master device, it is required to detect whether the received packet times out, and detect whether the packet is received within a period of three times the packet transmission period (3*3, 3 seconds period is only an example). If no, go to S414, if yes, go to S408 and continue to judge whether the message is received.

S414: The receiving packet times out, and the link or device is abnormal. The timeout exception processing is performed: Clearing the distributed link aggregation system ID. Go to S408 and re-determine whether the message is received. Therefore, in this mode, a device needs to be selected as the master device, and a communication link between the devices is established. The master device notifies other devices to configure the same system ID as the master device. Before the non-master device (that is, the device other than the master device) receives the packet, the negotiation between the local end and the peer end in the distributed link aggregation system is not performed because the ID of the distributed link aggregation system is not determined. The system ID of the distributed link aggregation can be determined only after the other device (that is, the non-master device) receives the system ID sent by the master device. In general, the message sent by the master device contains at least the following information: (1) Configure the distributed system ID flag; (2) System ID information of the master device. FIG. 5 is a flowchart of forming a distributed link aggregation system ID by dynamic negotiation of a communication mode according to an embodiment of the present invention. As shown in FIG. 5, the flow includes the following steps. S502, initialize, establish a communication link between devices. Default value initialization of decision system MAC and decision system priority: Initialize decision system MAC and decision system priority to the system MAC and system priority of the device, and go to S504.

S504. Determine whether the period of the sent message arrives. The period of the embodiment is 1 second (1 second is only an example value). If yes, go to S506, otherwise go to S508. S506: Send a message period to, send the priority of the device decision system MAC and the decision system to the neighboring device, go to S504, and continue to detect waiting for the packet to be sent.

S508. Determine whether the packet sent by the neighboring device is received. If yes, go to S510, otherwise go to S512.

S510: Receive a packet with a decision system MAC and a decision system priority sent by the master device, update the decision system MAC and the decision system priority of the device, parse the packet, compare the decision system MAC in the packet, and make a decision. The system priority and the system's own system MAC, system priority. In this embodiment, the system MAC and system priority with small values are used as the decision system MAC and decision system priority of the device. Of course, values can also be used. As a result of the decision, go to S516.

S512: After receiving the packet sent by the neighboring device, it needs to detect whether the received packet times out, and determine whether the packet is received within the triple packet sending period. If no, go to S514, and if yes, go to S504.

S514, indicating that the received packet times out, and the link or device is abnormal. In this case, the timeout exception processing is performed: Clear the distributed link aggregation system ID, and go to S504.

S516. It is determined that the system MAC and the decision system priority determined by the local device do not change within one minute, if not, the process goes to S518, otherwise the process goes to S520. S518, indicating that the decision of the system ID is not stable, and the distributed link aggregation system ID that was successfully determined before is cleared, and the process goes to S504.

S520, indicating that the system ID decision has been stabilized, taking the system ID (decision system MAC and decision system priority) of the device decision as the system ID (system MAC and system priority) of the distributed link aggregation, and moving to S504, restarting Detection to prevent link anomalies from occurring. It can be seen that for option three, the communication mode is dynamically negotiated. Dynamic negotiation also requires communication links between devices. However, there is no need to specify a master device. Each device sends its own system ID result to the neighboring device through the message. Each device makes a decision based on the system ID of the received message and the system ID of its own device. The packets are sent to each other. After waiting for a certain period of time, the packets are in a stable state. The system ID of each device is the same. The system ID is used as the system ID of the distributed link aggregation. The messages exchanged between devices contain at least the following data: System MAC of the decision, system priority of the decision. In summary, the distributed link aggregation method provided by the present invention solves the problem that the theoretical distributed link aggregation technology does not have the same system identifier of each device on the local end or the opposite end, so that the local end cannot perform with the peer end. Distributed link aggregation negotiation leads to the problem that distributed link aggregation cannot be implemented, and the effect of distributed link aggregation can be achieved. FIG. 6 is a structural block diagram of a distributed link aggregation apparatus according to an embodiment of the present invention. The apparatus is used to implement a distributed link aggregation method. As shown in FIG. 6, the apparatus mainly includes: an acquisition module 10 and a negotiation module 20. The obtaining module 10 is configured to obtain a unified distributed link aggregation system identifier ID of multiple devices of the local end, and the negotiation module 20 is connected to the obtaining module 10, and configured to send the distributed link aggregation system ID to the peer end. And performing distributed link aggregation negotiation with the peer according to the distributed link aggregation system ID. FIG. 7 is a structural block diagram of a preferred distributed link aggregation apparatus according to an embodiment of the present invention. As shown in FIG. 7, the obtaining module 10 mainly includes: a configuration unit 11 and a determining unit 12. The configuration unit 11 is configured to configure the same system ID for multiple devices of the local end; the determining unit 12 is connected to the configuration unit 11 and is configured to use the same system ID as the distributed link aggregation system ID. FIG. 8 is a structural block diagram of another preferred distributed link aggregation apparatus according to an embodiment of the present invention. As shown in FIG. 8, the acquisition module 10 mainly includes: a selection unit 13, a first transmission unit 14, and a determination unit 15. The selecting unit 13 is configured to select one of the plurality of devices at the local end; the first sending unit 14 is connected to the selected unit 13, and is configured to be configured to carry the first notification of the system ID of the primary device. The device is sent to other devices of the local device except the master device; the determining unit 15 is connected to the first sending unit 14, and is configured to determine that the other device successfully receives the first notification message, according to the The system ID of the master device carried in the notification message determines the distributed link aggregation system ID. FIG. 9 is a structural block diagram of still another preferred distributed link aggregation apparatus according to an embodiment of the present invention. As shown in FIG. 9, the acquisition module 10 mainly includes: a second sending unit 16, a decision unit 17, and a determining unit 18. The second sending unit 16 is configured to send a second notification message carrying the system ID of the device to the neighboring device adjacent to each device; the determining unit 17 is connected to the second sending unit 16, and is set to Receiving a second notification message, performing a selection decision on the system ID carried in the second notification message and the system ID of the neighboring device according to the preset decision rule, and determining a system ID that meets the decision rule, wherein the decision rule is a selection The maximum or minimum value of the system ID; the determining unit 18 is connected to the determining unit 17, and is configured to determine, according to the selection decision of all devices on the local end, the maximum system ID or the minimum system ID owned by all devices on the local end as the distributed chain. Road aggregation system ID. In summary, the distributed link aggregation device provided by the present invention solves the problem that the theoretical distributed link aggregation technology does not have the same system identifier of each device at the local end or the opposite end, so that the local end cannot perform with the peer end. Distributed link aggregation negotiation leads to the problem that distributed link aggregation cannot be implemented, and the effect of distributed link aggregation can be achieved. From the above description, it can be seen that the present invention achieves the following technical effects: The unified distributed link aggregation system identifier is provided at the local end or the opposite end, and the theoretical distributed link aggregation technology is solved due to the local end. The system identifiers of the devices on the peer end are different. As a result, the local end cannot perform distributed link aggregation negotiation with the peer end, which may cause the problem that distributed link aggregation cannot be implemented. The effect of distributed link aggregation can be achieved. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

A distributed link aggregation method, comprising:

Obtaining a unified distributed link aggregation system identifier ID of the multiple devices of the local end; sending the distributed link aggregation system ID to the peer end, and distributing according to the distributed link aggregation system ID and the peer end Link aggregation negotiation.

The method according to claim 1, wherein the obtaining a unified distributed link aggregation system ID of the multiple devices of the local end includes:

Configuring the same system ID for the multiple devices of the local end;

The same system ID is used as the distributed link aggregation system ID.

The method according to claim 2, wherein configuring the same system ID for the multiple devices of the local end includes:

Configuring a medium access control MAC of the same system and a priority of the same system for the plurality of devices of the local end;

The MAC of the same system and the priority of the same system are taken as the same system ID.

The method of claim 1, wherein the obtaining the unified distributed link aggregation system ID of the multiple devices of the local end comprises: selecting one of the multiple devices of the local end;

Transmitting, by the device, the first notification message of the system ID of the primary device to the other devices of the local device other than the primary device;

And determining, in the case that the other device successfully receives the first notification message, determining the distributed link aggregation system ID according to the system ID of the primary device carried in the first notification message.

5. The method according to claim 4, comprising:

The first notification message further includes: a flag for configuring the distributed link aggregation system ID; after the other device successfully receives the first notification message, parsing the first notification message, according to the Declaring the identifier of the distributed link aggregation system ID as the distributed link aggregation system ID of the master device; Determining that the distributed link aggregation system ID of all the devices of the local device is updated to the system ID of the primary device, and the system ID of the primary device is used as the distributed of all devices of the local device Link aggregation system ID. The method according to claim 1, wherein obtaining a unified distributed link aggregation system ID of the plurality of devices of the local end, comprising: each of the plurality of devices of the local end to a phase adjacent thereto The neighboring device sends a second notification message carrying its own system ID;

The neighboring device receives the second notification message, and performs selection decision on the system ID carried in the second notification message and the system ID of the neighboring device according to a preset decision rule. Determining the system ID that meets the decision rule, where the decision rule is to select a maximum value or a minimum value of the system ID; after all the devices at the local end perform the selection decision, determine the The maximum system ID or the minimum system ID owned by all devices of the local end is used as the distributed link aggregation system ID. The method according to claim 6, wherein all the devices at the local end perform the selection decision, including:

The second message notification of each other is performed between each of the plurality of devices of the local end. A distributed link aggregation device includes:

The acquisition module is configured to obtain a unified distributed link aggregation system identifier of multiple devices on the local end.

ID;

The negotiation module is configured to send the distributed link aggregation system ID to the peer end, and perform distributed link aggregation negotiation with the opposite end according to the distributed link aggregation system ID. The device according to claim 8, wherein the obtaining module comprises:

a configuration unit, configured to configure the same system ID for the multiple devices of the local end;

A determining unit is configured to use the same system ID as the distributed link aggregation system ID. The device according to claim 8, wherein the obtaining module comprises: a selecting unit, configured to select one of the plurality of devices of the local end; a first sending unit, configured to send a first notification message carrying the system ID of the master device to other devices of the local device other than the master device;

a determining unit, configured to determine, according to a system ID of the primary device carried in the first notification message, the distributed link, in a case that the determining that the other device successfully receives the first notification message Aggregate system ID.

The device according to claim 8, wherein the obtaining module comprises:

a second sending unit, configured to send, to a neighboring device adjacent to each device, a second notification message carrying a system ID of the device;

a decision unit, configured to receive the second notification message, and perform selection decision on the system ID carried in the second notification message and the system ID of the neighboring device according to a preset decision rule Determining, by the system ID that meets the decision rule, where the decision rule is selecting a maximum value or a minimum value of the system ID;

And determining, by the determining unit, the maximum system ID or the minimum system ID owned by all devices of the local end as the distributed link aggregation system ID after all the devices of the local end perform the selection decision.