WO2017152564A1 - Procédé et dispositif d'équilibrage de charge de liaison - Google Patents

Procédé et dispositif d'équilibrage de charge de liaison Download PDF

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Publication number
WO2017152564A1
WO2017152564A1 PCT/CN2016/090311 CN2016090311W WO2017152564A1 WO 2017152564 A1 WO2017152564 A1 WO 2017152564A1 CN 2016090311 W CN2016090311 W CN 2016090311W WO 2017152564 A1 WO2017152564 A1 WO 2017152564A1
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Prior art keywords
link
links
packet
length
packets
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PCT/CN2016/090311
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English (en)
Chinese (zh)
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杨军
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中兴通讯股份有限公司
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/12—Avoiding congestion; Recovering from congestion
    • H04L47/125—Avoiding congestion; Recovering from congestion by balancing the load, e.g. traffic engineering
    • 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 application relates to, but is not limited to, the field of communications technologies, and in particular, to a link load balancing method and apparatus.
  • one solution is to expand the device and upgrade to a high-speed port type by increasing the bandwidth of the single port.
  • Solution There is also a solution that does not change the original link, directly adds a new link, implements load balancing with the original link, and uses multiple links for traffic forwarding to achieve the same effect as the port bandwidth upgrade.
  • Communication devices often communicate with each other through multiple types of links.
  • the port rate and packet encapsulation are the same, it is easy to implement load balancing for each link, but for different types of The link (for example, SDH (Synchronous Digital Hierarchy) and Ethernet link), because the port rate is different, the physical layer and the link layer encapsulation type are different when the port transmits packets. Therefore, it is difficult to accurately implement different links.
  • the balanced load between them greatly reduces the efficiency of network communication.
  • the embodiment of the invention provides a link load balancing method and device, which solves the problem that the balanced load between different links cannot be accurately implemented in the related art.
  • a link load balancing method includes: estimating an average packet length of a packet transmitted on each link; determining, according to the average packet length, a transmission sharing ratio of each packet to the packet And performing load balancing adjustment on each of the links according to the transmission sharing ratio.
  • the estimating an average packet length of the packet transmitted on each link includes: obtaining respectively And taking the number of packets and the number of transmission bytes of the packets transmitted on each of the links in the first preset duration; and estimating the number according to the number of the packets and the number of the transmitted bytes. The average message length within the preset duration.
  • the estimating, according to the number of the packets and the number of the transmitted bytes, the average packet length in the preset duration includes: determining each of the first preset durations and each strip respectively The length of the sampled message of the packet transmitted on the link, the length of the sampled packet carries an unknown coefficient; the unknown coefficient is determined by a least square method; and the unknown coefficient and the length of the sampled message are used to estimate The average message length.
  • the method further includes: after performing load balancing adjustment on each of the links according to the transmission sharing ratio, detecting bandwidth utilization of each of the links; if each of the links is The difference between the bandwidth utilization ratios is greater than a preset threshold, and the number of packets and the number of transmission bytes of the packets transmitted on each of the links are obtained in the second preset duration, and the second preset duration is obtained. And less than the first preset duration; re-estimating the average packet length according to the newly obtained number of the packets and the number of transmission bytes, and determining a transmission sharing ratio of each link, until each The difference in bandwidth utilization of the link is less than or equal to the preset threshold.
  • the link includes a POS (Packet Over SONET/SDH) packet, a WAN link, and a LAN link; according to the average packet length, Determining, by each of the links, a transmission sharing ratio of the packet includes:
  • k1, k2, k3 are the line rate of the SDH link of the synchronous digital system, the line rate of the WAN link of the wide area network, the line rate of the LAN link of the local area network, and L is the average message length.
  • a link load balancing device includes: an estimating unit, a determining unit, and an adjusting unit.
  • An estimating unit configured to estimate an average packet length of a packet transmitted on each link; and a determining unit configured to determine, according to the average packet length estimated by the estimating unit, each of the links to the packet Transmission sharing ratio; adjusting unit, set to according to the transmission sharing ratio, for each The link performs load balancing adjustment.
  • the estimating unit comprises: an obtaining module and an estimating module.
  • the estimating unit estimates the average packet length of the packets transmitted on each link, including:
  • the obtaining module is configured to obtain the number of packets and the number of transmitted bytes of the packets transmitted on each of the links in the first preset duration, and the estimation module is set according to the number of the packets. And counting the number of bytes transferred, and estimating an average message length within the preset duration.
  • the estimating module according to the number of the packets and the number of the transmitted bytes, estimating an average packet length in the preset duration includes: determining, respectively, each of the first preset durations, The length of the sampled message of the message transmitted on each of the links, the length of the sampled message carrying an unknown coefficient; determining the unknown coefficient by using a least squares method; using the unknown coefficient and the length of the sampled message Estimating the average message length.
  • the device further includes: a detecting unit.
  • the detecting unit is configured to detect a bandwidth utilization rate of each of the links after performing load balancing adjustment on each of the links according to the transmission sharing ratio; the acquiring module further And if the difference between the bandwidth utilization ratio of each of the links is greater than a preset threshold, the number of packets and the transmission words of the packets transmitted on each of the links in the second preset duration are respectively obtained. And the second preset duration is smaller than the first preset duration; the estimating module is further configured to re-estimate the average according to the newly acquired number of the packets and the number of transmitted bytes The determining unit is further configured to determine a transmission sharing ratio of each of the links until a difference in bandwidth utilization of each of the links is less than or equal to the preset threshold.
  • the link includes a POS link, a WAN link, and a LAN link
  • the line rate of the road, the line rate of the LAN LAN link, and L is the average message length.
  • a computer readable storage medium storing computer executable instructions, the computer being executable
  • the link load balancing method is implemented when the row instructions are executed by the processor.
  • the link load balancing method and apparatus are capable of estimating an average packet length of a packet transmitted on each link, and determining, according to the average packet length, each of the link pairs.
  • the transmission sharing ratio of the packet then, according to the transmission sharing ratio, load balancing adjustment is performed for each of the links.
  • load balancing adjustment is performed for each of the links.
  • FIG. 1 is a flowchart of a link load balancing method according to an embodiment of the present invention
  • FIG. 2 is a schematic structural diagram of a link load balancing apparatus according to an embodiment of the present invention.
  • an embodiment of the present invention provides a link load balancing method, including steps S11-S13:
  • the link load balancing method provided by the embodiment of the present invention is capable of estimating an average packet length of a packet transmitted on each link, and determining, according to the average packet length, each of the links to the packet.
  • the transmission sharing ratio then load balancing adjustment for each of the links according to the transmission sharing ratio. In this way, even if each link type is different, the packet encapsulation structure is different, and the average packet length of the currently transmitted packet can be obtained in time, and then according to the characteristics of the packet structure on each link, how should each be in each Packets are allocated between links, enabling precise alignment of each link Perform load balancing adjustment.
  • Each link has its own data encapsulation format and data transmission rate.
  • the POS link format of the Ethernet LAN and SDH (in the PPP encapsulation format as an example) are shown in Table 1.
  • Table 2 is shown.
  • step S11 estimating the average packet length of the packet transmitted on each link includes the following steps:
  • the number of packets and the number of transmitted bytes of each packet transmitted on each link may be acquired in multiple time periods, and then the number of transmission bytes transmitted by each link during this period is divided. With each chain The number of packets transmitted on the road can be obtained as the average packet length of packets transmitted on each link.
  • the estimating, according to the number of the packets and the number of the transmitted bytes, the average packet length in the preset duration includes:
  • the length of the sampled message of the packet transmitted on each of the links in each of the first preset durations is determined, and the length of the sampled packet carries an unknown coefficient.
  • the unknown coefficient is determined using a least squares method.
  • the average message length is estimated using the unknown coefficient and the length of the sampled message.
  • the communication device has three outbound interfaces E, F, and G, and the communication device can agree or configure a sampling time interval T, and the device needs to be outbound at all load balancing intervals.
  • E, F, and G are sampled once, and are sampled as all the number of packets passing through the interface E, F, and G, Z1Z2Z3, and the number of transmission bytes C1C2C3, which are used to calculate the all-speed link forwarding through the device during the T time interval.
  • the average message length of the message can be manually set manually or automatically by the device to achieve better sharing accuracy.
  • the average message length for each sampling period is calculated as L1, L2, ... LN.
  • the function approximation is performed by the least squares method, and the accuracy error b of the N sets of data is calculated.
  • b is smaller than the preset precision value
  • the corresponding Y1...Y6 is the finally determined coefficient value
  • the corresponding L1, L2, ... LN is The length of the sampled message for each sampling period (each first preset duration).
  • the network layer Due to network packets of different structures, the network layer has different bandwidth ratios in the OSI seven-layer structure. Therefore, the network layer bandwidth utilization of each link is equal, and each link is loaded. When sharing, consider the bandwidth that the network layer actually uses.
  • the bandwidth ratio of the network layer message in the OSI seven-layer structure is L/(L+8+6+6+2+4+12).
  • the network layer is in the OSI.
  • the proportion in the seven-layer structure is L/(L+9)*(26/27).
  • L is the average packet length of the packets transmitted on each link. Then, when the packets are load balanced, the packets allocated to each link also meet the above ratio.
  • the implementation process is illustrated by a 10G Ethernet LAN link and a 10G POS link.
  • the transmission sharing ratio between the LAN link and the POS link is 10/(L+38): (9.95328*26/27)/(L+9).
  • the coefficient 10 is the line rate of the 10G LAN link
  • 9.95328 is the line rate of the 10G POS link.
  • the ratio of the actual physical bandwidth of each link may be used as a default value of the transmission sharing ratio.
  • load balancing adjustment may be performed on each of the links according to the transmission sharing ratio.
  • the link load balancing method may further include:
  • the difference in bandwidth utilization of each of the links is greater than a preset threshold, obtain the number of packets and the number of transmitted bytes of the packets transmitted on each of the multiple preset durations.
  • the second preset duration is less than the first preset duration.
  • the bandwidth utilization of the outbound interface of each link can be counted in the first preset duration. If the difference in bandwidth utilization of each link is less than or equal to a preset threshold, It means that the current load sharing according to this ratio can load balance each link. If the difference in bandwidth utilization of each link is greater than the preset threshold, the accuracy of the average length of the previously estimated packet is low. Therefore, the average packet length of each link can be re-estimated.
  • the estimation method is the same as the previous step, except that the sampling time is the second preset duration, and the second preset duration is less than the first preset duration, until the difference in bandwidth utilization of each link is less than or equal to the pre-predetermined Set the threshold.
  • the dichotomy method may be used for iterative calculation, and finally the traffic is evenly distributed on different links.
  • the first preset duration is 5 minutes
  • the estimated average packet length is 4 Mbyte
  • the calculated transmission sharing ratio is 3:5
  • the bandwidth utilization of the two links is measured.
  • the difference between the rates is 0.4, which is greater than the preset threshold of 0.2, and the packet length needs to be re-estimated.
  • the second preset duration is 2 minutes
  • the estimated average packet length is 3.8 Mbyte
  • the calculated transmission sharing ratio is 4:7
  • the bandwidth utilization of the two links is measured.
  • the difference is 0.1, which is less than the preset threshold of 0.2, and the equalization load adjustment is performed according to the transmission sharing ratio of 4:7.
  • the links between the communication devices may include a plurality of types.
  • the links include a POS link, a WAN link, and a LAN link.
  • the determining, according to the average packet length, the transmission sharing ratio of each of the links to the packet may include:
  • k1, k2, k3 are the line rate of the SDH link of the synchronous digital system, the line rate of the WAN link of the wide area network, the line rate of the LAN link of the local area network, and L is the average message length.
  • the transmission sharing ratio is also a ratio of corresponding coefficients, which is not implemented by the embodiment of the present invention. limited.
  • an embodiment of the present invention further provides a link load balancing apparatus, including: The unit 21, the determining unit 22 and the adjusting unit 23.
  • the estimating unit 21 is arranged to estimate the average message length of the message transmitted on each link.
  • the determining unit 22 is configured to determine, according to the average packet length estimated by the estimating unit, a transmission sharing ratio of each of the links to the packet.
  • the adjusting unit 23 is configured to perform load balancing adjustment on each of the links according to the transmission sharing ratio.
  • the estimating unit 21 can estimate the average packet length of the packet transmitted on each link, and the determining unit 22 can determine each chain according to the average packet length.
  • the transmission sharing ratio of the packet to the packet; the adjusting unit 23 is capable of performing load balancing adjustment on each of the links according to the transmission sharing ratio. In this way, even if each link type is different, the packet encapsulation structure is different, and the average packet length of the currently transmitted packet can be obtained in time, and then according to the characteristics of the packet structure on each link, how should each be in each Messages are allocated between the links, so that load balancing adjustment can be accurately performed for each link.
  • the estimating unit 21 may include: an obtaining module and an estimating module.
  • the estimating unit estimates the average packet length of the packets transmitted on each link, including:
  • the obtaining module is configured to obtain the number of packets and the number of transmitted bytes of the packets transmitted on each of the links in the first preset duration;
  • the estimating module is configured to estimate an average packet length within the preset duration according to the number of the packets and the number of the transmitted bytes.
  • the estimating module estimates, according to the number of the packets and the number of the transmitted bytes, that the average packet length in the preset duration includes:
  • the length of the sampled message of the packet transmitted on each of the links in each of the first preset durations is determined, and the length of the sampled packet carries an unknown coefficient.
  • the unknown coefficient is determined using a least squares method.
  • the average message length is estimated using the unknown coefficient and the length of the sampled message.
  • the link load balancing apparatus may further include: a detecting unit.
  • a detecting unit configured to detect, after the load balancing adjustment is performed on each of the links according to the transmission sharing ratio, detecting a bandwidth utilization rate of each link;
  • the acquiring module may be further configured to: if the difference in the bandwidth utilization ratio of each of the links is greater than a preset threshold, obtain the packets transmitted by each of the multiple preset durations and each of the links. Message The number and the number of bytes transferred, the second preset duration being less than the first preset duration.
  • the estimating module may be further configured to re-estimate the average packet length according to the newly obtained number of the packets and the number of the transmitted bytes.
  • the determining unit 22 is further configured to determine a transmission sharing ratio of each of the links until a difference in bandwidth utilization of each of the links is less than or equal to the preset threshold.
  • the link includes a POS link, a WAN link, and a LAN link.
  • the determining unit 22 determines, according to the average packet length, the transmission sharing ratio of each of the links to the packet, including: determining, by each of the links, a transmission sharing ratio of the packet:
  • k1, k2, k3 are the line rate of the SDH link of the synchronous digital system, the line rate of the WAN link of the wide area network, the line rate of the LAN link of the local area network, and L is the average message length.
  • a computer readable storage medium storing computer executable instructions that, when executed by a processor, implement the link load balancing method.
  • all or part of the steps of the above embodiments may also be implemented by using an integrated circuit. These steps may be separately fabricated into individual integrated circuit modules, or multiple modules or steps may be fabricated into a single integrated circuit module. achieve.
  • the devices/function modules/functional units in the above embodiments may be implemented by a general-purpose computing device, which may be centralized on a single computing device or distributed over a network of multiple computing devices.
  • the device/function module/functional unit in the above embodiment When the device/function module/functional unit in the above embodiment is implemented in the form of a software function module and sold or used as a stand-alone product, it can be stored in a computer readable storage medium.
  • the above mentioned computer readable storage medium may be a read only memory, a magnetic disk or an optical disk or the like.
  • the link load balancing method and apparatus are capable of estimating an average packet length of a packet transmitted on each link, and determining, according to the average packet length, each of the link pairs.
  • the transmission sharing ratio of the packet then, according to the transmission sharing ratio, load balancing adjustment is performed for each of the links.
  • load balancing adjustment is performed for each of the links.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Small-Scale Networks (AREA)

Abstract

L'invention concerne un procédé et un dispositif d'équilibrage de charge de liaison. Le procédé consiste à estimer la longueur de paquet moyenne de paquets transmis sur chaque liaison ; selon la longueur de paquet moyenne, à déterminer la proportion de partage de charge de transmission de chacune des liaisons par rapport aux paquets ; et selon la proportion de partage de charge de transmission, à effectuer un réglage d'équilibrage de charge sur chacune des liaisons.
PCT/CN2016/090311 2016-03-11 2016-07-18 Procédé et dispositif d'équilibrage de charge de liaison WO2017152564A1 (fr)

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CN114244845A (zh) * 2021-12-15 2022-03-25 锐捷网络股份有限公司 一种负载均衡的方法、装置及电子设备

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