WO2017000096A1

WO2017000096A1 - Link recovery method and network device

Info

Publication number: WO2017000096A1
Application number: PCT/CN2015/082583
Authority: WO
Inventors: 张钦剑; 胡海涛
Original assignee: 华为技术有限公司
Priority date: 2015-06-27
Filing date: 2015-06-27
Publication date: 2017-01-05
Also published as: CN107534576A; CN107534576B

Abstract

Disclosed are a link recovery method and corresponding network devices. The method comprises: a first device detecting that a data message between the first device and a second device is lost and then the first device sending a first recovery negotiation message to the second device; the first device determining whether a negotiation response message sent by the second device is received or not in a pre-set first time range. If the negotiation response message of the second device is not received, the first device sends an extra recovery negotiation message to the second device in a pre-set second time range until the first device receives the negotiation response message from the second device, wherein the values of time-out time fields in the recovery negotiation message which is sent a plurality of times are different. After receiving the negotiation response message, the first device recovers data link communication with the second device. According to the embodiment in the invention, the recovery negotiation message is sent a plurality of times and the values of time-out time fields capable of being modified in two successive recovery negotiation messages are set to different values, so that the time of re-negotiating after an LACP protocol has a fault can be shortened, a communication interrupt time delay is kept to a millisecond level and the requirements of telecommunication operations are met.

Description

Link recovery method and network device

Technical field

The present invention relates to the field of communications technologies, and in particular, to a link recovery method and a network device.

Background technique

Link aggregation (Link Aggregation) is to bundle multiple physical ports of a network device into a logical port to implement the load balancing of the inbound/outbound traffic on each member port and determine the packet through a certain load balancing policy. From which member port to send. Link aggregation control protocol (English: LiNK AggregatioN CoNtrol Protocol, abbreviated as LACP) binds multiple physical ports into one logical port, so that the multiple physical ports form a link aggregation group (English: LiNK AggregatioN Group, abbreviation :LAG) to increase link bandwidth and link reliability. Specifically, after the LACP is enabled on the physical port of the device, the device can send the LACP packet to the peer device through the multiple physical ports to negotiate with the peer device whether the physical port can perform the link. Aggregation, after the peer device receives the LACP packets, the peer device can determine, according to the information of the end device carried in the LACP packets and the information of the multiple physical ports, from the multiple physical ports. A physical port that performs link aggregation. After the device and the peer device perform the above operations, the device and the peer device can negotiate the physical ports that can perform link aggregation and complete the chain of these physical ports. Road aggregation.

In order to enhance system reliability, telecom equipment usually has two main control boards. When the main control board is faulty, the system is switched to the standby main control board. After the switchover, the standby main control board checks the dynamic data for verification. This process is called smoothing. At some stage of the process, the received LACP message may not be processed.

In the uplink scenario of the LACP aggregation, if the LACP protocol of one device is out of order, the negotiation needs to be re-initiated to allow the physical port to quickly switch to the forward state. Because operators usually require business interruptions to be within a few hundred milliseconds (such as 400ms). For this reason, the normal negotiation is to send the LACP initial negotiation packet to trigger the negotiation. After receiving the LACP packet, the peer will respond immediately. However, if the packet or the peer response packet is discarded for some reason, according to the current protocol, it is necessary to wait for the next normal protocol packet sending period to send the next packet, so that the interrupt delay will be longer. Can not meet the millisecond level requirements.

Summary of the invention

In view of this, the embodiments of the present invention provide a method, an apparatus, and a system for link aggregation to solve the above technical problem.

In a first aspect, an embodiment of the present invention provides a method for link recovery, including: detecting, by a first device, a data packet loss with a second device, where the first device and the second device pass a chain The first aggregation device sends a first recovery negotiation message to the second device; the first device determines whether the negotiation sent by the second device is received in the predetermined first time range. a response message; if the negotiation response message of the second device is not received, the first device sends an additional recovery negotiation message to the second device within a predetermined second time range until the first The device receives the negotiation response message from the second device, where the sum of the first time range and the second time range is less than one second, and the first device sends an additional recovery negotiation to the second device in the second time range. The number of the packets is not more than two, and the first recovery negotiation message and the additional recovery negotiation message that is not more than two times carry a timeout field; the first recovery negotiation message and the Extra for no more than two The value of the timeout period field included in the recovery negotiation message sent by the two neighboring packets is different. The first device recovers the data link with the second device after receiving the negotiation response packet. Communication.

In a second aspect, an embodiment of the present invention provides a network device, including: a detecting module, configured to detect whether a data packet between a device at another end of the link is lost; and the network device and the other end of the link The device is connected by the link aggregation protocol LACP. The negotiation packet sending module is configured to send the first recovery negotiation report after the detecting module detects that the data packet between the device at the other end of the link is lost. The device is provided to the device at the other end of the link, and the determining module is configured to determine whether a negotiation response message sent by the device at the other end of the link is received in the predetermined first time range and the second time range; The negotiation message sending module is further configured to: after the determining module confirms that the negotiation response message sent by the device at the other end of the link is not received within the first time range, within a predetermined second time range, The device at the other end of the link sends an additional recovery negotiation message until the determining module confirms that the negotiation response message is received from the device at the other end of the link; And the sum of the second time range is less than one second, and the number of the additional recovery negotiation messages sent by the device at the other end of the link is not more than two times in the second time range, the first recovery negotiation message and The timeout time field is carried in the additional recovery negotiation message that is not more than two times; the first recovery negotiation message and the additional recovery negotiation message that is not more than two times are sent to the recovery negotiation of two consecutive transmissions. The value of the timeout field included in the packet is different. The communication recovery module is configured to resume the device with the other end of the link after the determining module confirms that the device responds to the negotiation response message from the device at the other end of the link. Data link communication.

In a third aspect, an embodiment of the present invention provides another network device, including: a network design And comprising: a processor and a transceiver, wherein: the processor is configured to detect whether a data packet between the device at the other end of the link is lost; and the network device and the other end of the link The device is connected by the link aggregation protocol LACP; the transceiver is configured to send the first recovery negotiation message after the processor detects that the data packet between the device at the other end of the link is lost. And the processor is further configured to determine whether a negotiation response message sent by the device at the other end of the link is received in the predetermined first time range and the predetermined second time range. The transceiver is further configured to: after the processor confirms that the negotiation response message sent by the device at the other end of the link is not received in the predetermined first time range, in the predetermined second time range Sending an additional recovery negotiation message to the device at the other end of the link until the processor acknowledges receipt of the negotiation response message from the device at the other end of the link; wherein the first time range and the first Second hour The sum of the range is less than one second, and the number of the additional recovery negotiation packets sent by the device at the other end of the link is not more than two, and the first recovery negotiation message and the The timeout time field is carried in the two additional recovery negotiation messages; the first recovery negotiation message and the additional recovery negotiation message that is not more than two times are included in the two adjacent recovery negotiation messages. The value of the timeout field is different; the transceiver is further configured to resume data link communication with the device at the other end of the link after the processor confirms receipt of the negotiation response message.

The embodiment of the present invention can reduce the time of renegotiation after the failure of the LACP protocol by ensuring that the value of the timeout field that can be modified in the two consecutively restored negotiation packets is set to a different value. The communication interruption delay is at the millisecond level to meet the needs of telecom operations.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description are only some of the present invention. For the embodiments, those skilled in the art can obtain other drawings according to the drawings without any creative work.

1 is an example of an aggregation scenario involved in a link recovery method according to an embodiment of the present invention;

2 is an example of an aggregation scenario involved in a link recovery method according to another embodiment of the present invention;

3 is a flowchart of a link recovery method according to an embodiment of the present invention;

4 is a schematic structural diagram of a network device according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of another network device according to an embodiment of the present disclosure;

Figure 6 shows a typical general network component for use with embodiments of the present invention.

Specific embodiment

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The Link Aggregation Control Protocol (LACP) is a control protocol for implementing link aggregation in the IEEE 802.ad standard. Through this protocol, information is exchanged between partner systems at both ends of a link to allow their link aggregation control instances to agree on the identity of the link aggregation group to which the link belongs, and the mobile link to the link aggregation group And perform its send and receive functions in an orderly manner. The LACP protocol uses the LACPDUs to implement the automatic selection of links in the aggregation scenario and the automatic sensing and reselection of link changes to automatically control the normal working of each member link in the aggregation group.

The LACP protocol packet contains the following information: the Actor and the peer system priority, the local and peer system IDs, the local and remote port operations keys, and the local end. Port priority of the peer end, port ID of the local end and the peer end, and port status of the local end and the peer end. Based on the information, both parties of the aggregation select an appropriate link according to a certain selection algorithm, and control the state of the aggregation. The selected member link can forward the traffic normally, and the unselected member link will be blocked. No traffic can be forwarded. The total bandwidth of the aggregated link is equal to the sum of the bandwidths of the selected member links, and the traffic on the aggregated link is distributed to each selected member link according to certain rules.

FIG. 1 is an example of an aggregation scenario involved in a link recovery method according to an embodiment of the present invention. In Figure 1, device A and device B are aggregated by transmission device N. When device A and device B negotiate successful operation, device A and device B send a message to the other party every second. At time T0, device A receives the packet sent by device B, and sends a packet to device B. At this time, device A will receive and send the next packet every second. At this time, port N1 of device N. A flashing occurs. After the N1 port is disconnected, the N1 port is restored. The flashing of the N1 causes the port A1 to be flashed. The LACP status of the A1 port is cleared and needs to be renegotiated. According to the usual practice, device A needs to wait for one second, that is, at T0+1 seconds, it will send a recovery negotiation message to device B. After B responds, the two parties can negotiate successfully, which will cause the link terminal delay to be greater than 1 second. .

Note that the status of the LACP protocol on the A1 port is cleared. The renegotiation is not limited to the flashing of the A1 port. The device sends a LACP packet to the device. The device sends a response to the device. The device does not process the received LACP packet for a certain period of time. B responds to device A. The response packet device A cannot receive and process, and needs to be renegotiated.

In the solution of the embodiment of the present invention, the device A detects that the data packet is lost between the device B and the device B. After the device is lost, the device A sends a first recovery negotiation message to the device B that is connected to the device A through the link aggregation protocol LACP. The device A determines whether the device B has received the negotiation response packet in the predetermined first time range. . If device A does not receive the negotiation response message from device B, device A sends an additional recovery negotiation message to device B at a predetermined time interval in the second time range until device A receives the negotiation response message from the second device. And the number of the additional recovery negotiation packets sent by the device A to the device B in the second time range is not more than two times, and the additional recovery negotiation message that is not greater than two times carries the timeout field, and the first recovery negotiation is performed. The value of the timeout field included in the adjacent two additional recovery negotiation messages in the message and the additional recovery negotiation message not greater than twice is not the same. After receiving the negotiation response packet, the device will resume the data link communication with device 2. Here, the reason that the value of the timeout field included in the two additional recovery negotiation messages cannot be the same is that if the device A repeatedly sends two consecutive recovery negotiation messages with the same content to the device B in one cycle. The device B will consider that the packet retransmitted by the device A and the packet that has just been processed are duplicated, and the device B will not process the repeated packet received later. All the fields included in the recovery negotiation message have a fixed meaning, indicating a state. When any state changes according to the actual situation, the corresponding field in the sent message will change accordingly. The reason why the timeout period is selected in the embodiment of the present invention is because the modification of other fields affects the negotiation result. The timeout period field is a transmission period when the packet is sent normally after the negotiation is successful, and does not affect the service during the negotiation phase. Therefore, the embodiment of the present invention distinguishes two consecutive contents by modifying the value of the timeout field. The same recovery negotiation message, so that device B can recognize the difference of the value of the timeout field when receiving the recovery negotiation message sent later, so as to confirm that the two recovery negotiation messages received consecutively are not the same, Device B processes the two recovered negotiation packets received.

In the embodiment of the present invention, the recovery negotiation message is an LACP protocol message, and the negotiation response message is reported. The text is also a LACP protocol message. The device A may send the device to the device B for three times in a time interval of less than one second. The device A receives the negotiation response message from the device B. The device A receives the negotiation response message from the device B. The three recovery negotiation messages include the first recovery negotiation. The message, the first additional recovery negotiation message and the second additional recovery negotiation message. The value of the timeout field included in the first recovery negotiation message may be the same as the value of the timeout field included in the second additional recovery message. In this case, the value of the timeout field included in the first recovery negotiation message and the value of the timeout field included in the first additional recovery message cannot be the same. Similarly, the first additional recovery negotiation report. The value of the timeout field included in the text and the value of the timeout field included in the second additional recovery negotiation message cannot be the same.

In the embodiment of the present invention, the device A may send the recovery negotiation message to the device B at a predetermined time interval in less than one second, where the time less than one second may be specifically 400 ms, where the predetermined time interval is It can be a 50ms time interval.

FIG. 2 is an example of an aggregation scenario involved in a link recovery method according to another embodiment of the present invention. In Figure 2, device A and device B are directly connected to each other. When both links are successfully negotiated, device A and device B send packets to each other every second. At time T0, device A receives the packet of device B, and device A also sends a packet to device B. At this point, device A will take another second to receive and send the next message. If the active/standby switchover occurs on device A, the protocol status data needs to be renegotiated to be refreshed. In this case, device B does not detect that device A needs to initiate renegotiation immediately to recover quickly. Device A sends a recovery negotiation packet to device B. If the recovery negotiation packet sent by device A or the negotiation response packet from device B is discarded for some reason, for example, device A cannot process the received recovery negotiation packet after the active/standby switchover. If the device needs to wait for 1 second according to the existing scheme, then send the packet to device B again at time T0+1S, and then wait for the negotiation response of device B. Thus, the overall link termination delay will exceed 1 second. The solution of the embodiment of the present invention, after the first recovery negotiation negotiation message is sent by the A device, if the negotiation response message is not received within 50 ms, the first additional recovery negotiation message needs to be sent to the device B, and then waits. 50ms, if the negotiation response message is still not received, device A sends a second additional recovery negotiation message to device B, so that device B can respond. After receiving the negotiation response packet, the device will resume the data link communication with device 2. Here, the first time the negotiation message is restored, the first time the additional recovery negotiation message and the second additional recovery negotiation message carry the timeout field, and the timeout field in the first recovery negotiation message The value is different from the value of the timeout field in the first additional recovery negotiation message, the value of the timeout field in the first additional recovery negotiation message and the timeout in the second additional recovery negotiation message. The value of the time field is different.

FIG. 3 is a flowchart of a link recovery method according to an embodiment of the present invention, where the link recovery method includes:

S301. The first device detects that the data packet is lost between the second device and the second device.

S302: The first device sends a first recovery negotiation message to the second device that is connected to the first device by using the link aggregation protocol LACP.

S303. The first device determines whether a negotiation response packet of the second device is received in the predetermined first time range.

S304. If the negotiation response packet of the second device is not received, the first device sends an additional recovery negotiation message to the second device in the predetermined second time range until the first device receives the negotiation from the second device. Response message.

Here, the sum of the first time range and the second time range is less than one second, and the first device sends the number of additional recovery negotiation messages to the second device no more than two times in the second time range. The additional recovery negotiation packet that is not more than two times carries a timeout field; the first recovery negotiation packet The value of the timeout period field included in the recovery negotiation message sent in the adjacent two times in the additional recovery negotiation message that is not more than two is different.

Here, after the first device sequentially sends the first additional recovery negotiation message and the second additional recovery negotiation message to the second device at a predetermined time interval in the second time range, the first The device receives the negotiation response message from the second device, where the value of the timeout period field included in the first recovery negotiation message and the value of the timeout time field included in the second additional recovery message may be the same.

The sum of the first time range and the second time range is equal to 400 ms. More specifically, the value of the first time range may be 50 ms, and the first device may send an additional recovery negotiation message to the second device at a time interval of 50 ms in the second time range.

S305. The first device resumes data link communication with the second device.

FIG. 4 is a schematic structural diagram of a network device according to an embodiment of the present invention. The network device 400 may be the device A in FIG. 1 and FIG. The network device 400 includes a detection module 401, configured to detect whether a data packet between the device at the other end of the link is lost. The network device 400 is connected to the device at the other end of the link through a link aggregation protocol LACP.

The negotiation packet sending module 403 is configured to send the first recovery negotiation message to the other end of the link after the detecting module 401 detects that the data packet between the device at the other end of the link is lost. device;

The determining module 404 is configured to determine whether the negotiation response message sent by the device at the other end of the link is received in the predetermined first time range and the second time range; the negotiation message sending module 403 is further configured to:

After the judging module 404 confirms that the negotiation response message sent by the device at the other end of the link is not received within the first time range, the second end of the link is set to the other end of the link. An additional recovery negotiation message is sent, until the determining module 404 confirms that the negotiation response message is received from the device at the other end of the link; wherein the sum of the first time range and the second time range is less than one second. The number of the additional recovery negotiation packets sent by the device at the other end of the link to the second time range is not more than two times, and the first recovery negotiation message and the additional recovery negotiation report not greater than two times. The timeout field is carried in the text; the value of the timeout field included in the two consecutive recovery negotiation messages in the first recovery negotiation message and the additional recovery negotiation message not greater than two times is different. ;

The communication recovery module 402 is configured to resume data link communication with the device at the other end of the link after the determining module confirms that the negotiation response message is received from the device at the other end of the link.

The negotiation packet sending module 403 of the embodiment of the present invention may sequentially send the first additional recovery negotiation message and the second additional recovery to the device at the other end of the link at a predetermined time interval in the second time range. After the negotiation packet, the network device 400 receives the negotiation response packet from the device at the other end of the link, where the value of the timeout period field included in the first restoration negotiation message may be included in the second additional recovery message. The timeout field has the same value. The sum of the first time range and the second time range of the embodiment of the present invention may be equal to 400 ms. The first time range of the embodiment of the present invention may be 50 ms, and the first device may send an additional recovery negotiation message to the device at the other end of the link at a time interval of 50 ms in the second time range.

FIG. 5 is a schematic structural diagram of another network device 500 according to an embodiment of the present invention. The network device 500 may be the device A in FIG. 1 and FIG. 2. The network device 500 includes a processor 501 and a transceiver 502, where:

The processor 501 is configured to detect whether a data packet is lost between the device at the other end of the link, and the network device 500 is connected to the device at the other end of the link by using a link aggregation protocol LACP.

The transceiver 502 is configured to send a first recovery negotiation message to the device at the other end of the link after the processor 501 detects that the data packet between the device at the other end of the link is lost. ;

The processor 501 is further configured to determine whether a negotiation response message sent by a device at another end of the link is received in a predetermined first time range and a predetermined second time range;

The transceiver 502 is further configured to: after the processor 501 confirms that the negotiation response message sent by the device at the other end of the link is not received in the predetermined first time range, at the predetermined second time Sending an additional recovery negotiation message to the device at the other end of the link until the processor acknowledges receipt of the negotiation response message from the device at the other end of the link; wherein the first time range and The sum of the second time range is less than one second, and the number of the additional recovery negotiation messages sent by the device at the other end of the link is not more than two times in the second time range, the first recovery negotiation message and the The timeout period field is carried in the additional recovery negotiation packet that is not more than two times; the first restoration negotiation negotiation message and the recovery negotiation negotiation message sent in the two adjacent recovery negotiation messages that are not more than two times The value of the timeout field included is not the same;

The transceiver 502 is further configured to resume data link communication with a device at another end of the link after the processor 501 confirms that the negotiation response message is received.

The processor 501 of the embodiment of the present invention sends the first additional recovery negotiation message and the second additional recovery negotiation message to the device at the other end of the link in a predetermined time interval. The transceiver 502 receives the negotiation response message from the device at the other end of the link, where the value of the timeout period field included in the first recovery negotiation message and the timeout period included in the second additional recovery message The values of the fields can be the same.

In the embodiment of the present invention, after the negotiation message is sent multiple times, and the value in the timeout period field that can be modified in the two consecutive recovery negotiation messages is set to a different value, the LACP protocol failure may be reduced. The time of renegotiation ensures that the communication interruption delay is at the millisecond level to meet the needs of telecom operations.

These components can be used with any common network component, such as a computer or network component with sufficient processing power, memory resources, and network throughput capabilities to collectively handle the amount of work it undertakes. FIG. 6 shows a typical general network group 600 that is suitable for implementing one or more embodiments for the components disclosed herein. Network component 600 can include a processor 602 (which can be referred to as a central processing unit or CPU) that can be in communication with any memory device, including auxiliary memory 603, read only memory (ROM) 604, random access memory (RAM) 605, input. /output (I/O) device 601, network connection device 606, or a combination of these devices. The processor 602 can function as one or more CPU chips or as part of one or more application specific integrated circuits (ASICs).

Secondary storage 603 typically includes one or more disk drives or tape drives for non-volatile storage of data that can be used as an overflow data storage device if RAM 605 is not large enough to process all of the operational data. When the programs loaded onto the RAM 605 are selected and executed, the auxiliary memory 603 can be used to store these programs. ROM 604 is used to store the read instructions and possible data during program execution. The ROM 604 is a non-volatile storage device having a small memory capacity with respect to the auxiliary memory 603 of a larger memory capacity. The RAM 605 is used to store volatile data and perhaps store instructions. Accessing ROM 604 and RAM 605 is typically faster than accessing secondary storage 603.

At least one embodiment is disclosed, and variations, combinations, and/or modifications of the functions of the embodiments and/or embodiments can be made by those skilled in the art within the scope of the invention. Alternative embodiments resulting from combining, integrating, and/or deleting the functionality of the embodiments are also included within the scope of the invention. If a numerical range or limitation is explicitly stated, an explicit range or limitation should be understood such that the range of iterations of a similar level included or limitation is within the scope or limitation specified (for example, ranges from 1 to 10 include 2, 3, 4; a range greater than 0.10 includes 0.11, 0.12, 0.13, etc.). For example, if the number is disclosed For the lower limit value R1 and the upper limit value Ru, it is necessary to specifically disclose any number within this range. In particular, the following numbers within the specific disclosure: R = Rl + k * (Ru - Rl), where k is a variable between 1% and 100% in increments of 1%, ie k is 1%, 2% , 3%, 4%, 5%, up to 50%, 51%, 52%, up to 95%, 96%, 97%, 98%, 99% or 100%. Moreover, it is also necessary to specifically disclose any numerical range defined by the two R definitions defined above. The use of the terms "optionally" with respect to any element in the claims means that the element is required or is not required, and both alternatives are within the scope of the claims. The use of broad terms such as "including", "comprising", "including", and the like, shall be understood to provide support for narrow words such as "consisting of," "consisting essentially of," "consisting essentially of." Accordingly, the scope of protection is not limited by the foregoing description, but is defined by the following claims, which are the equivalent of the subject matter of the claims. Each of the claims is included in the specification as a further invention, which is an embodiment of the invention. References pertaining to the prior art in the present invention, particularly references having a publication date after the priority date of the present application, are not discussed. The disclosures of all patents, patent applications, and publications cited in this specification are hereby incorporated by reference in their entirety to the extent of the disclosure of the disclosure of the disclosure.

Although a plurality of embodiments are provided in the present invention, it should be understood that the disclosed systems and methods may be embodied in many other specific forms without departing from the spirit and scope of the invention. The examples in the present invention are considered to be illustrative of the present invention and are not intended to limit the invention, and the invention is not limited to the details provided herein. For example, in other systems, individual components or components may be combined or integrated, and certain features may or may not be implemented.

The techniques, systems, subsystems, and methods in the various embodiments may be combined or integrated with other systems, modules, techniques, or methods without departing from the scope of the invention. Other items shown or discussed herein that are directly or indirectly connected or connected to each other may be electrically, mechanically or otherwise by some interface, device or intermediate component. The way is indirectly connected or connected. Changes, substitutions and variations of the other examples are intended to be determined by those skilled in the art and are not to be

Claims

A method for link recovery, comprising:

The first device detects that the data packet is lost between the second device and the second device, and the first device is connected to the second device by using a link aggregation protocol LACP.

The first device sends a first recovery negotiation message to the second device;

Determining, by the first device, whether a negotiation response message sent by the second device is received in a predetermined first time range;

If the negotiation response message of the second device is not received, the first device sends an additional recovery negotiation message to the second device within a predetermined second time range until the first device is from the second device. The device receives the negotiation response message; the sum of the first time range and the second time range is less than one second, and the first device sends the number of additional recovery negotiation messages to the second device in the second time range. The timeout time field is carried in the first recovery negotiation message and the additional recovery negotiation message that is not more than two times; the first recovery negotiation message and the extra is not more than twice The value of the timeout field included in the recovery negotiation message sent by the two adjacent recovery packets is different.

The first device resumes data link communication with the second device after receiving the negotiation response message.
The method of claim 1, wherein the first device transmits an additional recovery negotiation message to the second device within a predetermined second time range until the first device receives from the second device The negotiation response message includes: after the first device sends the first additional recovery negotiation message and the second additional recovery negotiation message to the second device at a predetermined time interval in the second time range, The first device receives a negotiation response message from the second device.
The method of claim 2, wherein the value of the timeout period field included in the first recovery negotiation message is the same as the value of the timeout field included in the second additional recovery negotiation message.
The method of claim 1 wherein the sum of said first time range and said second time range is no more than 400 ms.
The method of claim 2, wherein the first time range is 50 ms, the first device sends an additional recovery negotiation message to the second device at a predetermined time interval in the second time range. include:

The first device sends an additional recovery negotiation message to the second device at a time interval of 50 ms in the second time range.
A network device, including:

a detecting module, configured to detect whether a data packet is lost between the device at the other end of the link; and the network device is connected to the device at the other end of the link by using a link aggregation protocol LACP;

a negotiation packet sending module, configured to send a first recovery negotiation message to a device at another end of the link after the detecting module detects that the data packet is lost between the device at the other end of the link;

The determining module is configured to determine whether a negotiation response message sent by the device at the other end of the link is received in the predetermined first time range and the predetermined second time range; the negotiation message sending module is further configured to:

After the determining module confirms that the negotiation response message sent by the device at the other end of the link is not received within the first time range, sending an additional message to the device at the other end of the link within a predetermined second time range. Recovering the negotiation message until the determining module confirms that the negotiation response message is received from the device at the other end of the link; wherein the sum of the first time range and the second time range is less than one second, The number of the additional recovery negotiation packets sent by the device at the other end of the link is not more than two in the second time range, and the first recovery negotiation message and the additional recovery negotiation message that is not more than two times are carried in the second recovery negotiation message. a timeout period field, where the value of the timeout period field included in the two consecutive recovery negotiation messages sent by the two consecutive recovery negotiation messages is not the same;

The communication recovery module is configured to resume data link communication with the device at the other end of the link after the determining module confirms that the negotiation response message is received from the device at the other end of the link.
The network device of claim 6 wherein:

The negotiation packet sending module sends the first additional recovery negotiation message and the second additional recovery negotiation message to the device at the other end of the link in a second time interval at a predetermined time interval. The determining module determines that the network device receives a negotiation response message from a device at another end of the link.
The network device according to claim 7, wherein the value of the timeout period field included in the first restoration negotiation message is the same as the value of the timeout time field included in the second additional restoration negotiation message.
A network device, including a processor and a transceiver, wherein:

The processor is configured to detect whether a data packet is lost between the device at the other end of the link; and the network device is connected to the device at the other end of the link by using a link aggregation protocol LACP;

The transceiver is configured to send a first recovery negotiation message to a device at another end of the link after the processor detects that the data packet is lost between the device at the other end of the link;

The processor is further configured to determine whether a negotiation response message sent by the device at the other end of the link is received in the predetermined first time range and the predetermined second time range;

The transceiver is further configured to: after the processor confirms that the first time range is not received After the negotiation response message sent by the device at the other end of the link, in the predetermined second time range, an additional recovery negotiation message is sent to the device at the other end of the link until the processor confirms the The device at the other end of the link receives the negotiation response message; wherein the sum of the first time range and the second time range is less than one second, and the second time range sends an additional to the device at the other end of the link. The number of the recovery negotiation packets is not more than two, and the first recovery negotiation message and the additional recovery negotiation message that is not more than two times carry a timeout field; the first recovery negotiation message and the The value of the timeout field included in the two consecutive recovery negotiation messages sent by the two adjacent recovery negotiation messages is not the same;

The transceiver is further configured to resume data link communication with a device at another end of the link after the processor confirms receipt of the negotiation response message.
The network device of claim 9 wherein:

After the processor sends the first additional recovery negotiation message and the second additional recovery negotiation message to the device at the other end of the link in the second time range, the transceiver sends and receives the first additional recovery negotiation message and the second additional recovery negotiation message. The device receives a negotiation response message from the device at the other end of the link.
The network device according to claim 9, wherein the value of the timeout period field included in the first restoration negotiation message is the same as the value of the timeout time field included in the second additional recovery message.