WO2012028012A1 - 一种链路聚合的方法及设备 - Google Patents

一种链路聚合的方法及设备 Download PDF

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Publication number
WO2012028012A1
WO2012028012A1 PCT/CN2011/075970 CN2011075970W WO2012028012A1 WO 2012028012 A1 WO2012028012 A1 WO 2012028012A1 CN 2011075970 W CN2011075970 W CN 2011075970W WO 2012028012 A1 WO2012028012 A1 WO 2012028012A1
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WIPO (PCT)
Prior art keywords
state machine
timer
port
aggregation
data frame
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PCT/CN2011/075970
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English (en)
French (fr)
Inventor
陈健
叶傲
马苗苗
杜相文
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中兴通讯股份有限公司
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Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to RU2013113726/08A priority Critical patent/RU2541862C2/ru
Priority to EP11821038.4A priority patent/EP2613478B1/en
Publication of WO2012028012A1 publication Critical patent/WO2012028012A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/24—Multipath
    • H04L45/245—Link aggregation, e.g. trunking
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/50—Reducing energy consumption in communication networks in wire-line communication networks, e.g. low power modes or reduced link rate

Definitions

  • the present invention relates to the field of network communications, and in particular, to a method and a device for link aggregation. Background technique
  • LACP Link Aggregation Control Protocol
  • TRUNK link aggregation group
  • the Control (MAC) application layer can treat the link aggregation group as a separate link. After the link is added to the link aggregation group, the application packet transmission can be performed only after the data frame transmission and reception functions of the ports on the aggregation link in the link aggregation group are enabled. Otherwise, the application packet is lost. .
  • the LACP contains six state machines: the Receive Machine, the Periodic Transmission Machine, the Selection Logic Machine, the Mux Machine, and the Transient State Machine ( Transmit machine ) and the Churn Detection machine.
  • the first five state machines complete the aggregation control of the link, and each of the receiving state machine, the periodic sending state machine, the compound state machine, and the transmitting state machine has a timer to control the state transition of these state machines.
  • the change of the data frame transmission and reception function of the aggregation link port is controlled by each state machine in the LACP, and the state change of each state machine is maintained by a timer. Therefore, in order to reduce the loss of application packets, LACP
  • the duration setting of the timers in each state machine is very important.
  • the receiving state machine is responsible for receiving a Link Aggregation Control Protocol Data Unit (Link Aggregation Control Protocol Data Unit).
  • the LACPDU is extracted from the LACPDU packet to extract the status information of the peer port for use by other state machines. Long, according to the set duration, if the port status information transmitted by the peer is not received within the set time of the timer, the timer expires, the default peer port status information is provided to other state machines, and Disable the data frame transmission and reception function of the port to prevent application packets from passing.
  • the LACPDU packet is exchanged. After the LACPDU packet negotiation succeeds, the data frame transmission and reception function of the port is enabled, and the application packet can pass.
  • the periodic sending state machine is mainly used to determine the period during which the local end and the peer end periodically send LACPDUs, and periodically send LACPDU packets to the peer end to maintain the aggregation of the link. Specifically, if the timer time of the timer arrives, Then, the port has a message sending state variable (Need To Transmit, NTT) of TRUE, indicating that the port needs to send a message.
  • the sending state machine is configured to send the LACPDU packet to the peer end when the NTT is TRUE, that is, the port has the requirement to send the LACPDU packet, and the timer of the timer is expired.
  • the composite state machine is responsible for adding the port to the aggregation group selected by the logical state machine, or deleting the port from the selected aggregation group, and opening or closing the port according to the peer port state information obtained by the peer LACPDU packet. Data frame transmission and reception function.
  • the composite state machine disables the data frame transmission and reception function of the port to be added to the aggregation group.
  • the timer is set, and the timer is used to select all the ports that are added to the aggregation group to be selected into the appropriate aggregation group.
  • the state of the port is added to the aggregation group. Then, the local end
  • the updated port status information needs to be sent to the peer.
  • the port status information cannot be notified to the peer in time. .
  • the port status information of the LACPDU sent by the peer port can be used to determine the status of the peer port.
  • the data frame of the local port is used. Transceiver function is turned on. Therefore, if the timer of the sending state machine does not expire, the port of the local port cannot be timely. The status information is notified to the peer port in time, so that the data frame sending and receiving functions cannot be opened at the same time, which may cause loss of application packets.
  • each timing is determined.
  • the setting of the duration of the device is set by the user, or is set by the user.
  • the timer is set, the user often fails to notify the peer end of the status information of the port on the aggregation link.
  • the transceiver function cannot be turned on at the same time, which causes the application message to be lost during transmission. Summary of the invention
  • the main purpose of the present invention is to provide a method and a device for link aggregation, which can reduce the loss of application packets during link aggregation.
  • a method for link aggregation comprising:
  • the logical state machine is selected to select an aggregation group for the port, the timer of the composite state machine is set and timed, and the composite state machine prepares the port to join the selected aggregation group;
  • the composite state machine When the timer of the composite state machine and the timer of the sending state machine arrive at the same time, the composite state machine adds the port to the selected aggregation group, and the composite state machine opens the message according to the aggregation state information in the received LACPDU message.
  • the data frame transmission and reception function of the port is used to transmit application packets.
  • the method further includes: setting a timer of the sending state machine in advance, starting timing after the setting is completed; and starting a new timing after the timer of the transmitting state machine expires.
  • the method further includes: setting a timer of the receiving state machine and a timer of the periodic sending state machine, and setting a timer of the sending state machine to Timely, periodically send the state machine's timer and receive state machine The timer starts timing.
  • the method further includes: sending the LACPDU packet with the periodicity of the periodic state of the periodic state machine, and interacting with the port state information.
  • the method further includes: performing LACPDU packet exchange with the timer duration of the sending state machine while performing the application transmission; when the timer of the receiving state machine expires, the method does not receive The packet of the LACPDU of the peer end is closed.
  • the method further includes: receiving a timer of the state machine to restart timing, and receiving the LACPDU packet of the opposite end in the time period of receiving the timer of the state machine, The data frame receiving and receiving function of the local end is enabled. After the timer of the receiving state machine expires, the LACPDU packet of the peer end is not received, and the composite state machine deletes the port of the local end from the aggregation group.
  • the duration of the timer of the sending state machine is kd; the timer duration of the composite state machine is (dn - l) k; the timer duration of the receiving state machine is kdn; The timer duration of the machine is between kd and kdn; where k is an integer multiple of 10ms, and d and n are positive integers greater than one.
  • the method further includes: determining whether the data frame transceiver function of the port is closed, and if not, closing the data frame of the port. Transceiver function.
  • a device for link aggregation includes: a shutdown device, configured to disable data frame transceiving function of all ports; and a device for selecting a timer for transmitting a state machine, selecting a logical state machine to select an aggregation group for a port Setting the timer of the composite state machine and starting timing, the composite state machine prepares the port to join the selected aggregation group; turns on the transmission device, and the timer for the composite state machine and the timer of the transmission state machine arrive at the same time When the composite state machine will be the end The port is added to the selected aggregation group.
  • the composite state machine opens the port data frame transmission and reception function according to the aggregation status information in the received LACPDU packet, and transmits the application packet.
  • the device further includes a timing timing device, configured to set a timer of the receiving state machine and a timer for periodically transmitting the state machine, and when the timer of the sending state machine in the joining device expires The timer that periodically sends the state machine and the timer that receives the state machine start timing.
  • a timing timing device configured to set a timer of the receiving state machine and a timer for periodically transmitting the state machine, and when the timer of the sending state machine in the joining device expires The timer that periodically sends the state machine and the timer that receives the state machine start timing.
  • the method and the device for the link aggregation provided by the present invention ensure that the port state information of the two ends of the aggregation link interacts in time, and the data frame transmission and reception functions of both ends are simultaneously opened. Reduce the loss of application messages.
  • the data frame transmission and reception function of the local end is closed in time, which improves the reliability of the application message transmitted by the aggregation link.
  • FIG. 1 is a schematic diagram of relationship between state machines in a link aggregation control process in the prior art
  • FIG. 2 is a schematic flowchart of a link aggregation method according to the present invention
  • FIG. 3 is a schematic diagram of a link aggregation embodiment between switches
  • FIG. 5 is a schematic structural diagram of a link aggregation device according to the present invention.
  • FIG. 6 is a schematic diagram of implementing a link aggregation system according to the present invention. detailed description
  • the basic idea of the present invention is: Turn off the data frame transmission and reception function of all ports; When the timer of the sending state machine expires, select the logic state machine to select an aggregation group for the port, set the timer that meets the state machine, and start timing, the composite state The machine prepares the port to join the selected aggregation group; when the timer of the composite state machine and the timer of the sending state machine arrive at the same time, the composite state machine adds the port to the selected aggregation group, and the composite state machine receives the Gather in the LACPDU packet With the status information, the port data frame transmission and reception function is opened, and the application message is transmitted.
  • FIG. 2 shows a flow of a method for implementing link aggregation according to the present invention. As shown in FIG. 2, the method includes the following steps:
  • the duration of the timer of the sending state machine of all ports has been set in advance, and the timing is started after the setting is completed.
  • the composite state machine adds the port to the selected aggregation group, and the composite state machine opens according to the aggregation state information in the received LACPDU message. Transmitting and receiving the data frame of the port, and transmitting the application packet;
  • the interaction when the timer of the composite state machine and the timer of the sending state machine arrive at the same time, the interaction includes the LACPDU packet ready to be added to the aggregation group state information, and the port is added according to the received LACPDU 4 message. Aggregate the group and change the port status to the aggregation state.
  • the timer of the sending state machine arrives again, the LACPDU packet containing the aggregation status information is exchanged. The data frame transmission and reception function of the open port is opened, and the application packet is transmitted.
  • FIG. 3 shows an embodiment of link aggregation between switches.
  • a link AB between switch one and switch two has only port A and port B on the link, for simplicity.
  • the present invention will be described in detail, and the present invention will be described below in conjunction with the embodiment of the aggregated link of FIG.
  • FIG. 4 shows a timing sequence of a method for implementing link aggregation according to the present invention. As shown in FIG. 4, the method includes the following steps:
  • Port A and port B respectively turn off the data frame sending and receiving function of each port, set the NTT value to TRUE, and receive the state machine and periodically send status.
  • port A and port B send their respective LACPDUs to the peer to exchange LACPDUs.
  • the duration of the timer of the transmission state machine of port A and port B has been set in advance, and the timing is started after the setting is completed.
  • the timer duration of the transmission state machine may be set to kxd, which is expressed as kd ( The relevant expressions in the subsequent description are similar to this, and will not be described again, where k is an integer multiple of 10 ms, and d is a positive integer greater than 1.
  • the timer duration of the receiving state machine may be set to kdn to ensure that the timing of the timer of the receiving state machine can be fully utilized, and the sending state machine of the opposite end is sent to send a message; and the periodic sending state machine is set.
  • the timer duration is between kd and kdn.
  • the timer duration of the periodic transmission state machine is set to 2kd, where n is a positive integer greater than one.
  • the logical state machine is selected to select an appropriate aggregation group for port A and port B, and the timer of the composite state machine is set.
  • the timer of the composite state machine can be set to (dn - l) k.
  • port A or port B After receiving the LACPDU packet from the peer end, port A or port B completes the selection and composite state of the aggregation group in k time.
  • Set the timer of the machine that is, after receiving the LACPDU message and after k time, the timer of the composite state machine starts counting. It can be seen that the value of k is the time required for the selection logic state machine to select an aggregation group for the port and set the timer of the composite state machine.
  • the LACPDU packet containing the state information of the aggregation group is exchanged.
  • the timer of the composite state machine is set to (dn - l)k and the time occupied by S102 is k
  • the timer from the transmitting state machine of S101 is restarted until the timer of the composite state machine expires.
  • the time elapsed is k+(dn - l)k, that is, nkd
  • the timer of the transmitting state machine is set to kd, so that the timer of the composite state machine and the timer of the transmitting state machine can be simultaneously reached.
  • the port status of port A and port B becomes ready to join the aggregation group.
  • port A and port B need to send LACPDUs, and the timer of the state machine is sent.
  • the port status information of port A and port B can be exchanged through the LACPDU text in time.
  • the port A is added to the aggregation group, and the port status of the port A is changed to the aggregation state.
  • the port B is added to the aggregation group, and the port status of the port B is changed to the aggregation state.
  • port A and port B are added to the aggregation group is not necessarily the same, and there may be a certain time difference.
  • the data frame receiving and receiving function of the port A and the port B is determined to be closed. If not, the data frame sending and receiving function of the port is disabled, and the application packet transmission is further prevented. Lose.
  • the LACPDU packet containing the aggregation state information is exchanged, and the port A and the port B respectively collect the data of the port according to the aggregation state information in the received LACPDU packet of the peer end.
  • the frame transceiver function is enabled to transmit application packets.
  • the status information contained in the LACPDU message sent by the timer of the sending state machine is the aggregation status information, because the last time of the timer of the sending state machine expires with the timer of the composite state machine.
  • the port A and the port B send the LACPDU packet in a periodic manner of the state of the sending state machine to interact with the state information of the port; here, the timer duration of the sending state machine is Kd;
  • port A still does not receive the LACPDU packet of port B, and the port state information of the peer end is set to the non-aggregated state according to LACP and the port A is notified, and port A is The data frame receiving and receiving function of the local end is turned off according to the port state information of the non-aggregated state, and the application packet is prevented from being sent.
  • the timer of the receiving state machine is restarted;
  • the port B still does not receive the LACPDU packet of the port A.
  • the subsequent processing is the same as the above, and will not be described again.
  • the port A After receiving the LACPDU packet of the port B, the port A receives the data frame transmission and reception function of the local end.
  • the port B receives the LACPDU packet of the port A in the time when the timer of the receiving state machine is re-timed, the data frame transmitting and receiving function of the local end is turned on.
  • FIG. 5 is a schematic diagram showing the structure of an apparatus for implementing link aggregation according to the present invention. As shown in FIG. 5, the apparatus includes: a shutdown device 10, an adding device 20, and an opening transmission device 30.
  • the shutdown device 10 is configured to disable the data frame transceiving function of all ports; the adding device 20 is configured to select the logical state machine as the port selection when the shutdown device 10 turns off the data frame transceiving function of all ports and the timer of the sending state machine expires.
  • Aggregation group, setting and starting timing of the timer of the composite state machine the composite state machine prepares the port to join the selected aggregation group; turns on the transmission device 30 for the timer of the composite state machine and the timing of the transmission state machine At the same time, the composite state machine adds the port to the selected aggregation group.
  • the composite state machine opens the port data frame transceiver function according to the aggregated state information in the received LACPDU packet, and transmits the application packet. .
  • the device further includes a timing timing device 40, configured to set a timer for receiving the state machine and a timer for periodically transmitting the state machine, and a timer of the sending state machine in the joining device 20 When the time is up, the timer of the state machine and the timer of the receiving state machine are periodically counted.
  • a timing timing device 40 configured to set a timer for receiving the state machine and a timer for periodically transmitting the state machine, and a timer of the sending state machine in the joining device 20 When the time is up, the timer of the state machine and the timer of the receiving state machine are periodically counted.
  • the system includes: a switch 1 and a switch 2; wherein, switch 1 and switch 2 include at least one port; switch 1 or switch The composite state machine of the second switch off the data frame transmission and reception function of the port; when the timer of the transmission state machine of the switch 1 or the switch 2 expires, the LACPDU message is sent to the switch 2 or the switch 1 to select the aggregation group for the port, and the composite state machine is selected.
  • the timer is set and starts timing; when the timer of the composite state machine of the switch 1 or the switch 2 and the timer of the sending state machine arrive at the same time, the LACPDU message containing the state information of the aggregation group is sent to the switch 2 or Switch 1; The port of Switch 1 or Switch 2 is added to the aggregation group, and the status of the port is changed to the aggregation state. It should be understood that the time for each port of Switch 1 and Switch 2 to join the aggregation group is not necessarily the same, and there may be a certain time difference. When the timer of the sending state machine expires, the sending contains the aggregation status letter. LACPDU message to the packet switch LACPDU two or a switch, or a switch to switch two received two switch or switch a transmission Aggregation status information, open the data frame transceiver function of the port.
  • the switch 1 or the switch 2 is specifically configured to set a timer for receiving the state machine and a timer for periodically sending the state machine, and periodically send the timer of the state machine when the timer of the sending state machine expires.
  • the timer of the receiving state machine starts timing.
  • the switch 1 or the switch 2 is specifically configured to send the LACPDU packet by using a timer duration of the periodic sending state machine.
  • the switch 1 or the switch 2 is configured to send the LACPDU message to the switch 2 or the switch 1 according to the timer duration of the sending state machine; and the timer in the receiving state machine After receiving the LACPDU of Switch 2 or Switch 1, the data frame transmission and reception function of the local end is disabled.
  • the timer of the receiving state machine restarts timing, and receives the LACPDU of the switch 2 or the switch 1 during the time period of receiving the state machine timer. If the timer of the receiving state machine expires, the LACPDU packet of Switch 2 or Switch 1 is not received, and the composite state machine switches the port of Switch 1 or Switch 2 from the aggregation group. delete.
  • the duration of the timer of the transmission state machine of the switch 1 and the switch 2 is kd; the timer duration of the composite state machine is (dn _ l) k; the timer duration of the receiving state machine is kdn; The timer duration is between kd and kdn; where k is an integer multiple of 10ms, and d and n are positive integers greater than one.
  • the method, the device and the system for the link aggregation provided by the present invention ensure that the port state information of the two ends of the aggregation link interacts in time, and the data frame transmission and reception functions of both ends are simultaneously realized. If the aggregation link is abnormal, and the LACPDU packet of the peer is not received, the data frame transmission and reception function of the local end is closed in time, which improves the reliability of the application message transmitted by the aggregation link. Sex.

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Description

一种链路聚合的方法及设备 技术领域
本发明涉及网络通讯领域， 尤其涉及一种链路聚合的方法及设备。 背景技术
链路聚合控制协议（ Link Aggregation Control Protocol, LACP )是一种 实现链路动态聚合的协议， LACP将一条或多条链路聚合到一起，形成链路 聚合组（TRUNK ), 从而使得媒体接入控制 （MAC )应用层可以把链路聚 合组当作一条单独的链路对待。 在链路加入到链路聚合组后， 只有让链路 聚合组中的聚合链路两端端口的数据帧收发功能都打开后， 才能进行应用 报文的传输， 否则， 应用报文就会丟失。
LACP中包含有六个状态机： 接收状态机（Receive machine ), 定期发 送状态机( Periodic Transmission machine )、选择還辑状态机 ( Selection Logic machine )、 复合状态机 ( Mux machine )、 发送状态机 ( Transmit machine ) 以及发现扰乱状态机（ Churn Detection machine )。通常前 5个状态机完成链 路的聚合控制， 其中接收状态机、 定期发送状态机、 复合状态机、 发送状 态机中各有一个定时器来控制这些状态机的状态迁移。 聚合链路端口的数 据帧收发功能的改变， 是通过 LACP 中的各个状态机来控制的， 而各个状 态机的状态变化则是通过定时器来维护的， 因此为了减少应用报文的丟失， LACP中各个状态机的定时器的时长设置非常重要。
图 1是现有技术中链路聚合控制过程中各状态机的关系示意图，如图 1 所示， 接收状态机负责接收对端发送的链路聚合控制协议数据单元（Link Aggregation Control Protocol Data Unit, LACPDU )才艮文， 从所述 LACPDU 报文中提取对端端口的状态信息， 以供其他状态机使用； 设置定时器的时 长， 根据设置的时长开始计时， 若在定时器设置的时长内未接收到对端传 输过来的端口状态信息， 定时器超时， 则提供缺省的对端端口状态信息给 其他状态机使用， 同时关闭端口的数据帧收发功能， 不让应用报文通过。 当接收到对端端口的状态信息后， 进行 LACPDU报文的交互， 当 LACPDU 报文协商成功后， 则将端口的数据帧收发功能打开， 能够让应用报文通过。
定期发送状态机主要用于确定本端和对端定期发送 LACPDU报文的周 期， 定期发送 LACPDU报文到对端， 以维持链路的聚合， 具体地， 如果所 述定时器的定时时间到达， 则设置端口的有消息发送状态变量 （Need To Transmit, NTT )为 TRUE, 表示端口有报文需要发送。 其中， 发送状态机 用于当所述 NTT为 TRUE, 即端口有发送 LACPDU报文的需求时，且本身 的定时器计时到时时， 负责发送 LACPDU报文到对端。
选择逻辑状态机， 负责将此端口选入合适的聚合组， 该状态机未使用 到定时器。
复合状态机， 负责将端口加入到选择逻辑状态机选择的聚合组， 或者 将端口从选出的聚合组中删除， 并且根据对端的 LACPDU报文获取的对端 端口状态信息， 打开或者关闭端口的数据帧收发功能， 当端口处于初始态 时， 复合状态机把将要加入到聚合组中的端口的数据帧收发功能都关闭。 作上述操作的同时， 设置定时器， 所述定时器用于等待加入到聚合组中的 所有端口都被选择到合适的聚合组中， 此时端口的状态为能够加入到聚合 组， 然后， 本端需要将更新过的端口状态信息发送到对端， 因此， 会有发 送 LACPDU报文的需要， 若此时的发送状态机的定时器未到时， 则不能及 时地将端口状态信息通知给对端。 当端口加入到聚合组后， 通过对端端口 发送过来的 LACPDU 文的端口状态信息， 可以判断对端端口的状态， 当 得到对端的端口也加入到聚合组时， 则将本端端口的数据帧收发功能打开。 因此若发送状态机的定时器计时未到时， 就不能及时地将本端端口的端口 状态信息及时通知给对端端口， 使得数据帧收发功能不能同时打开， 容易 造成应用报文的丟失。
然而上述具有定时器的四个状态机各自定时器的时长并没有在 LACP 中明确给出， 而且他们之间的关系也不确定， 目前在使用 LACP进行链路 聚合控制的过程中， 对各个定时器时长的设置通过取用经验值， 或者交由 用户进行设置； 用户在设置定时器的时候， 常常由于设置不合理， 使得聚 合链路一端端口的状态信息不能及时通知到对端， 使得数据帧收发功能不 能够同时打开， 导致应用报文在传输过程中的丟失。 发明内容
有鉴于此， 本发明的主要目的在于提供一种链路聚合的方法及设备， 能够实现链路聚合过程中减少应用报文丟失的目的。
为达到上述目的， 本发明的技术方案是这样实现的：
一种链路聚合的方法， 所述方法包括：
关闭所有端口的数据帧收发功能；
发送状态机的定时器到时， 选择逻辑状态机为端口选择聚合组， 对复 合状态机的定时器进行设置并开始计时， 复合状态机将所述端口准备加入 到选择的聚合组；
复合状态机的定时器和发送状态机的定时器同时到时， 复合状态机将 所述端口加入到选择的聚合组， 复合状态机根据接收到的 LACPDU报文中 的聚合状态信息， 打开所述端口的数据帧收发功能， 进行应用报文的传输。
进一步地， 所述方法还包括： 预先对发送状态机的定时器进行设置， 设置完毕后开始计时； 所述发送状态机的定时器到时之后开始新的计时。
进一步地， 所述关闭所有端口的数据帧收发功能之后， 所述方法还包 括： 对接收状态机的定时器和定期发送状态机的定时器进行设置， 并在所 述发送状态机的定时器到时时， 定期发送状态机的定时器和接收状态机的 定时器开始计时。
进一步地， 所述对复合状态机的定时器进行设置并开始计时之后， 所 述方法还包括： 以定期发送状态机的定时器时长为周期进行 LACPDU报文 的发送， 交互端口状态信息。
进一步地， 所述方法还包括： 进行应用 ^艮文传输的同时， 以发送状态 机的定时器时长为周期进行 LACPDU报文的交互； 当在接收状态机的定时 器到时后， 没有接收到对端的 LACPDU的报文， 则关闭本端的数据帧收发 功能。
进一步地， 所述关闭本端的数据帧收发功能之后， 所述方法还包括： 接收状态机的定时器重新开始计时， 在接收状态机的定时器的计时时间内， 接收到对端的 LACPDU报文， 则打开本端的数据帧收发功能； 在接收状态 机的定时器到时后， 没有接收到对端的 LACPDU报文， 复合状态机将本端 的端口从聚合组中删除。
进一步地， 所述发送状态机的定时器的时长为 kd; 所述复合状态机的 定时器时长为 (dn - l)k; 所述接收状态机的定时器时长为 kdn; 所述定期发 送状态机的定时器时长介于 kd和 kdn之间； 其中 k为 10ms的整数倍数， d 和 n为大于 1的正整数。
进一步地， 所述复合状态机将所述端口加入到选择的聚合组之后， 所 述方法还包括： 判断所述端口的数据帧收发功能是否关闭， 若未关闭， 则 关闭所述端口的数据帧收发功能。
一种链路聚合的设备， 所述设备包括： 关闭装置， 用于关闭所有端口 的数据帧收发功能； 加入装置， 用于发送状态机的定时器到时， 选择逻辑 状态机为端口选择聚合组， 对复合状态机的定时器进行设置并开始计时， 复合状态机将所述端口准备加入到选择的聚合组； 打开传输装置， 用于复 合状态机的定时器和发送状态机的定时器同时到时， 复合状态机将所述端 口加入到选择的聚合组， 复合状态机根据接收到的 LACPDU报文中的聚合 状态信息， 打开所述端口数据帧收发功能， 进行应用报文的传输。
进一步地， 所述设备还包括定时计时装置， 用于对接收状态机的定时 器和定期发送状态机的定时器进行设置， 并在所述加入装置中的所述发送 状态机的定时器到时时， 定期发送状态机的定时器和接收状态机的定时器 开始计时。
本发明所提供的链路聚合的方法及设备， 通过合理设置各个状态机的 定时器的时长， 保证将聚合链路中两端的端口状态信息及时交互， 实现了 两端的数据帧收发功能同时打开， 减少了应用报文的丟失。 另外， 在聚合 链路出现异常， 接收不到对端的 LACPDU报文时， 将本端的数据帧收发功 能及时关闭， 提高了聚合链路传输应用报文的可靠性。 附图说明
图 1为现有技术中链路聚合控制过程中各状态机的关系示意图； 图 2为本发明实现链路聚合方法的流程示意图；
图 3为交换机间的链路聚合实施例示意图；
图 4为本发明实现链路聚合方法的时序流程图；
图 5为本发明实现链路聚合设备的结构示意图；
图 6为本发明实现链路聚合系统的示意图。 具体实施方式
本发明的基本思想为： 关闭所有端口的数据帧收发功能； 发送状态机 的定时器到时， 选择逻辑状态机为端口选择聚合组， 对符合状态机的定时 器进行设置并开始计时， 复合状态机将所述端口准备加入到选择的聚合组； 复合状态机的定时器和发送状态机的定时器同时到时， 复合状态机将所述 端口加入到选择的聚合组， 复合状态机根据接收到的 LACPDU报文中的聚 合状态信息， 打开所述端口数据帧收发功能， 进行应用报文的传输。
为使本发明的目的、 技术方案和优点更加清楚明白， 以下举具体实施 例并参照附图， 对本发明进一步详细说明。
图 2示出了本发明实现链路聚合的方法的流程， 如图 2所示， 所述方 法包括下述步骤：
511 , 关闭所有端口的数据帧收发功能；
本步骤中， 已经预先对所有端口的发送状态机的定时器的时长进行了 设置， 设置完毕后开始计时。
512, 发送状态机的定时器到时， 选择逻辑状态机为端口选择聚合组， 对复合状态机的定时器进行设置并开始计时， 复合状态机将所述端口准备 加入到选择的聚合组；
本步骤中， 在复合状态机的定时器计时时间内， 等待所有端口准备加 入到上述选择逻辑状态机所选择的聚合组， 根据 LACP以定期发送状态机 的定时器时长为周期进行 LACPDU "^文的发送， 以交互端口状态信息。
513 , 复合状态机的定时器和发送状态机的定时器同时到时， 复合状态 机将所述端口加入到选择的聚合组， 复合状态机根据接收到的 LACPDU报 文中的聚合状态信息， 打开所述端口数据帧收发功能， 进行应用报文的传 输；
本步骤中， 复合状态机的定时器和发送状态机的定时器同时到时， 交 互包含有准备好加入聚合组状态信息的 LACPDU报文， 根据接收到的上述 LACPDU 4艮文， 将端口加入到聚合组， 并改变端口状态为聚合状态， 当发 送状态机的定时器再次到时时， 进行包含有聚合状态信息的 LACPDU报文 交互， 打开端口的数据帧收发功能打开， 进行应用报文的传输。
图 3示出了交换机间的链路聚合的一种实施例， 如图 3所示， 交换机 一和交换机二之间的一条链路 AB,链路上只有端口 A和端口 B , 为了简单 明了地对本发明进行阐述， 下面结合图 3 的聚合链路实施例， 对本发明进 行阐述。
图 4示出了本发明实现链路聚合的方法的时序流程， 如图 4所示， 所 述方法包括下述步骤：
5101 , 预先对发送状态机的定时器进行设置， 设置完毕后开始计时， 端口 A和端口 B分别关闭各自端口的数据帧收发功能， 设置 NTT的值为 TRUE, 并对接收状态机和定期发送状态机各自的定时器的时长进行设置； 发送状态机的定时器计时到时， 端口 A和端口 B分别将各自的 LACPDU 报文发送给对端， 进行 LACPDU报文的交互。
本步骤中， 已经预先对端口 A和端口 B的发送状态机的定时器的时长 进行了设置， 设置完毕后开始计时， 优选地， 可以设置发送状态机的定时 器时长为 kxd,表示为 kd (后续描述中相关表达形式与此类似， 不再赘述）， 其中 k为 10ms的整数倍数， d为大于 1的正整数。
相应地， 可以设置接收状态机的定时器时长为 kdn, 以保证能够充分地 利用所述接收状态机的定时器的定时时长， 等待对端的发送状态机进行报 文的发送；设置定期发送状态机的定时器时长介于 kd和 kdn之间 ,优选地， 定期发送状态机的定时器时长设置为 2kd, 其中， n为大于 1的正整数。
应当理解， 本步骤中， 发送状态机的定时器计时到时时， 定期发送状 态机的定时器和接收状态机的定时器开始计时； 各个状态机的定时器计时 到时后， 会不间断地开始新的计时。
5102, 端口 A和端口 B进行 LACPDU报文交互后， 选择逻辑状态机 为端口 A和端口 B选择合适的聚合组， 同时对复合状态机的定时器进行设 置。
本步骤中， 复合状态机的定时器可以设置为（dn - l)k,端口 A或端口 B 收到对端的 LACPDU报文后， 在 k时间内， 完成聚合组的选择及复合状态 机的定时器的设置， 即收到 LACPDU报文并经过 k时间后， 复合状态机的 定时器开始计时。由此可见， k的取值为选择逻辑状态机为端口选择聚合组、 并对复合状态机的定时器进行设置所需要的时间。
S103-S104, 等待端口 A和端口 B准备加入到上述选择逻辑状态机所 选择的聚合组， 根据 LACP 以定期发送状态机的定时器时长为周期进行 LACPDU报文的发送， 以交互端口 A和端口 B的端口状态信息； 这里 , 定 期发送状态机的定时器时长为 2kd。
5105 , 复合状态机的定时器和发送状态机的定时器同时到时， 进行包 含有准备好加入聚合组状态信息的 LACPDU报文交互。
本步骤中， 由于复合状态机的定时器设置为 (dn - l)k, 而 S102 占用的 时间为 k, 因此从 S101的发送状态机的定时器重新开始计时到复合状态机 的定时器到时， 共经历的时间为 k+(dn - l)k, 即 nkd, 而发送状态机的定时 器设置为 kd, 所以， 可以实现复合状态机的定时器和发送状态机的定时器 同时到时。
当复合状态机的定时器到时， 端口 A和端口 B的端口状态变为准备好 加入聚合组的状态，此时端口 A和端口 B有发送 LACPDU报文的需要， 而 发送状态机的定时器同时到时， 可以及时地将端口 A和端口 B的端口状态 信息通过 LACPDU 文进行交互。
5106, 根据收到的 LACPDU报文， 端口 A加入到所述聚合组， 并改变 端口 A的端口状态为聚合状态； 端口 B加入到所述聚合组， 并改变端口 B 的端口状态为聚合状态。
应当理解， 端口 A和端口 B加入到聚合组的时间不一定是同时， 可能 会存在一定的时差。
本步骤中还可以包括判断端口 A和端口 B的数据帧收发功能是否关闭， 若未关闭， 则关闭端口的数据帧收发功能， 进一步保证阻止应用报文的传 输。
5107 ,发送状态机的定时器到时，进行包含有聚合状态信息的 LACPDU 报文交互，端口 A和端口 B分别根据各自接收到的对端的 LACPDU报文中 的聚合状态信息， 将自身端口的数据帧收发功能打开， 以进行应用报文的 传输。
由于发送状态机的定时器的上一个计时时间与复合状态机的定时器同 时到时， 因此此处发送状态机的定时器发送的 LACPDU报文包含的状态信 息为聚合状态信息。
5108, 进行应用 ^艮文传输的同时， 端口 A和端口 B以发送状态机的定 时器时长为周期进行 LACPDU报文的发送，以交互端口的状态信息；这里， 发送状态机的定时器时长为 kd;
5109, 当在接收状态机的定时器到时后， 端口 A仍没有接收到端口 B 的 LACPDU报文， 就会依据 LACP将对端的端口状态信息设置为非聚合状 态并告知端口 A, 端口 A就会根据所述非聚合状态的端口状态信息， 关闭 本端的数据帧收发功能， 阻止应用报文的发送， 同时， 再启动接收状态机 的定时器重新进行计时；
同理， 当在接收状态机的定时器到时后， 端口 B仍没有接收到端口 A 的 LACPDU报文， 后面的处理与上述相同， 不再赘述。
5110, 当在接收状态机的定时器重新计时的时间内， 端口 A接收到端 口 B的 LACPDU报文后， 则打开本端的数据帧收发功能。
同理， 当在接收状态机的定时器重新计时的时间内， 端口 B接收到端 口 A的 LACPDU报文后， 则打开本端的数据帧收发功能。
本步骤中还可以包括当在接收状态机的定时器重新计时到时后，端口 A 仍没有接收到端口 B的 LACPDU报文，则复合状态机将端口 A从该聚合组 中删除； 同理， 端口 B的操作与之类似， 不再赘述。 图 5示出了本发明实现链路聚合的设备的结构示意， 如图 5所示， 所 述设备包括： 关闭装置 10、 加入装置 20以及打开传输装置 30。 其中， 关 闭装置 10用于关闭所有端口的数据帧收发功能； 加入装置 20用于在关闭 装置 10关闭所有端口的数据帧收发功能且发送状态机的定时器到时时， 选 择逻辑状态机为端口选择聚合组， 对复合状态机的定时器进行设置并开始 计时， 复合状态机将所述端口准备加入到选择的聚合组； 打开传输装置 30 用于在复合状态机的定时器和发送状态机的定时器同时到时， 复合状态机 将所述端口加入到选择的聚合组， 复合状态机根据接收到的 LACPDU报文 中的聚合状态信息， 打开所述端口数据帧收发功能， 进行应用报文的传输。
进一步地， 所述设备还包括定时计时装置 40, 用于对接收状态机的定 时器和定期发送状态机的定时器进行设置， 并在所述加入装置 20中的所述 发送状态机的定时器到时时， 定期发送状态机的定时器和接收状态机的定 时器开始计时。
图 6示出了本发明实现链路聚合的系统的结构， 如图 6所示， 所述系 统包括： 交换机一和交换机二； 其中， 交换机一和交换机二包含有至少一 个端口； 交换机一或交换机二的复合状态机关闭端口的数据帧收发功能； 交换机一或交换机二的发送状态机的定时器到时， 发送 LACPDU报文给交 换机二或交换机一， 为端口选择聚合组， 并对复合状态机的定时器进行设 置并开始计时； 交换机一或交换机二的复合状态机的定时器和发送状态机 的定时器同时到时， 发送包含有准备好加入聚合组状态信息的 LACPDU报 文给交换机二或交换机一； 交换机一或交换机二的端口加入到聚合组， 改 变端口状态为聚合状态， 应当理解， 交换机一和交换机二各自端口加入到 聚合组的时间不一定是同时， 可能会存在一定的时差， 发送状态机的定时 器到时，发送包含有聚合状态信息的 LACPDU报文给交换机二或交换机一， 交换机一或交换机二接收到的交换机二或交换机一发送的 LACPDU报文中 的聚合状态信息， 打开端口的数据帧收发功能。
具体地， 交换机一或交换机二具体用于对接收状态机的定时器和定期 发送状态机的定时器进行设置， 并在所述发送状态机的定时器到时时， 定 期发送状态机的定时器和接收状态机的定时器开始计时。
进一步地， 所述交换机一或交换机二具体用于以定期发送状态机的定 时器时长为周期进行 LACPDU报文的发送。
具体地， 所述交换机一或交换机二具体用于进行应用报文传输的同时， 以发送状态机的定时器时长为周期发送 LACPDU报文给交换机二或交换机 一； 当在接收状态机的定时器到时后， 没有接收到交换机二或交换机一的 LACPDU的报文， 则关闭本端的数据帧收发功能。
其中， 所述交换机一或交换机二关闭本端的数据帧收发功能后， 接收 状态机的定时器重新开始计时， 在接收状态机的定时器的计时时间内， 接 收到交换机二或交换机一的 LACPDU报文，则打开端口的数据帧收发功能； 在接收状态机的定时器到时后， 没有接收到交换机二或交换机一的 LACPDU报文，复合状态机将交换机一或交换机二的端口从聚合组中删除。
其中， 所述交换机一和交换机二的发送状态机的定时器的时长为 kd; 复合状态机的定时器时长为 (dn _ l)k; 接收状态机的定时器时长为 kdn; 定 期发送状态机的定时器时长介于 kd和 kdn之间； 其中 k为 10ms的整数倍 数， d和 n为大于 1的正整数。
本发明所提供的链路聚合的方法、 设备及系统， 通过合理设置各个状 态机的定时器的时长， 保证将聚合链路中两端的端口状态信息及时交互， 实现了两端的数据帧收发功能同时打开， 减少了应用报文的丟失； 另外， 在聚合链路出现异常， 接收不到对端的 LACPDU报文时， 将本端的数据帧 收发功能及时关闭， 提高了聚合链路传输应用报文的可靠性。
以上所述， 仅为本发明的较佳实施例而已， 并非用于限定本发明的保 护范围

Claims

权利要求书
1、 一种链路聚合的方法， 其特征在于， 所述方法包括：
关闭所有端口的数据帧收发功能；
发送状态机的定时器到时， 选择逻辑状态机为端口选择聚合组， 对复 合状态机的定时器进行设置并开始计时， 复合状态机将所述端口准备加入 到选择的聚合组；
复合状态机的定时器和发送状态机的定时器同时到时， 复合状态机将 所述端口加入到选择的聚合组， 复合状态机根据接收到的链路聚合控制协 议数据单元（LACPDU )报文中的聚合状态信息， 打开所述端口的数据帧 收发功能， 进行应用报文的传输。
2、 根据权利要求 1所述的方法， 其特征在于， 所述方法还包括： 预先 对发送状态机的定时器进行设置， 设置完毕后开始计时； 所述发送状态机 的定时器到时之后开始新的计时。
3、 根据权利要求 1所述的方法， 其特征在于， 所述关闭所有端口的数 据帧收发功能之后， 所述方法还包括： 对接收状态机的定时器和定期发送 状态机的定时器进行设置， 并在所述发送状态机的定时器到时时， 定期发 送状态机的定时器和接收状态机的定时器开始计时。
4、 根据权利要求 3所述的方法， 其特征在于， 所述对复合状态机的定 时器进行设置并开始计时之后， 所述方法还包括： 以定期发送状态机的定 时器时长为周期进行 LACPDU报文的发送， 交互端口状态信息。
5、 根据权利要求 3所述的方法， 其特征在于， 所述方法还包括： 进行应用报文传输的同时， 以发送状态机的定时器时长为周期进行
LACPDU ^艮文的交互；
当在接收状态机的定时器到时后，没有接收到对端的 LACPDU的报文， 则关闭本端的数据帧收发功能。
6、 根据权利要求 5所述的方法， 其特征在于， 所述关闭本端的数据帧 收发功能之后， 所述方法还包括：
接收状态机的定时器重新开始计时， 在接收状态机的定时器的计时时 间内， 接收到对端的 LACPDU报文， 则打开本端的数据帧收发功能； 在接 收状态机的定时器到时后， 没有接收到对端的 LACPDU报文， 复合状态机 将本端的端口从聚合组中删除。
7、 根据权利要求 3至 6任一项所述的方法， 其特征在于， 所述发送状 态机的定时器的时长为 kd; 所述复合状态机的定时器时长为 (dn - l)k; 所 述接收状态机的定时器时长为 kdn;所述定期发送状态机的定时器时长介于 kd和 kdn之间； 其中 k为 10ms的整数倍数， d和 n为大于 1的正整数。
8、 根据权利要求 1至 6任一项所述的方法， 其特征在于， 所述复合状 态机将所述端口加入到选择的聚合组之后， 所述方法还包括： 判断所述端 口的数据帧收发功能是否关闭， 若未关闭， 则关闭所述端口的数据帧收发 功能。
9、 一种链路聚合的设备， 其特征在于， 所述设备包括：
关闭装置， 用于关闭所有端口的数据帧收发功能；
加入装置， 用于发送状态机的定时器到时， 选择逻辑状态机为端口选 择聚合组， 对复合状态机的定时器进行设置并开始计时， 复合状态机将所 述端口准备加入到选择的聚合组；
打开传输装置， 用于复合状态机的定时器和发送状态机的定时器同时 到时， 复合状态机将所述端口加入到选择的聚合组， 复合状态机根据接收 到的 LACPDU报文中的聚合状态信息， 打开所述端口的数据帧收发功能， 进行应用报文的传输。
10、 根据权利要求 9所述的设备， 其特征在于， 所述设备还包括定时 计时装置， 用于对接收状态机的定时器和定期发送状态机的定时器进行设 置， 并在所述加入装置中的所述发送状态机的定时器到时时， 定期发送状 态机的定时器和接收状态机的定时器开始计时。
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