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WO2008125030A1 - A load sharing method and the apparatus - Google Patents

A load sharing method and the apparatus Download PDF

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Publication number
WO2008125030A1
WO2008125030A1 PCT/CN2008/070233 CN2008070233W WO2008125030A1 WO 2008125030 A1 WO2008125030 A1 WO 2008125030A1 CN 2008070233 W CN2008070233 W CN 2008070233W WO 2008125030 A1 WO2008125030 A1 WO 2008125030A1
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Prior art keywords
load sharing
weight
link
load
module
Prior art date
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PCT/CN2008/070233
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English (en)
French (fr)
Inventor
Zhaokun Ding
Dapeng Chen
Qiangsheng Ruan
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Publication of WO2008125030A1 publication Critical patent/WO2008125030A1/zh
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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

Definitions

  • the present invention relates to the field of network communications, and in particular, to a load sharing method and apparatus. Background technique
  • Load sharing is one of the most common networking methods. In actual networking applications, when transmitting resources or port resources
  • the node R3 learns the entire network route of the backbone network through the node R1 and the node R2, respectively, and forms a three-way load-sharing forwarding entry on the R3, and the exit is respectively a two GE link and a 2. 5G bandwidth P0S link. .
  • the traffic on each link is 1/3 of all upstream traffic. In this way, when the total uplink traffic exceeds 3G, the traffic of each link will exceed 1G, which causes two GE links to be congested. 2.
  • the 5G link has free bandwidth but cannot be used.
  • the prior art solution is: Using a link bundling technique, a set of low-speed interfaces as a whole participates in load sharing of the high-speed interface.
  • This method solves the above problems to some extent.
  • the number of low-speed interfaces is too small to be bundled, or the above problem is still not solved even if the overall bandwidth and high-speed interface are widened.
  • link bundling cannot be applied. Summary of the invention
  • a load sharing method includes the following steps:
  • Load balancing is performed on the load sharing link according to the weight.
  • An embodiment of the present invention further provides a load sharing device, where the device includes a weight generation module and a load sharing module. Piece;
  • the weight generating module is configured to generate a weight of the load sharing link, and send the weight to the load sharing module.
  • the load sharing module is configured to receive a weight sent by the weight generating module, and perform load sharing on the load sharing link according to the weight.
  • the load balancing is performed according to the weight of the link in the case of load sharing of different bandwidth links, thereby implementing the control of the service quality, and avoiding the service quality degradation or the service interruption caused by the congestion of the low speed port.
  • FIG. 1 is a schematic diagram of network load sharing in the prior art
  • FIG. 2 is a flowchart of a load sharing method according to an embodiment of the present invention.
  • FIG. 3 is a structural diagram of a load sharing device according to an embodiment of the present invention.
  • FIG. 4 is another structural diagram of a load sharing device according to an embodiment of the present invention.
  • FIG. 5 is another structural diagram of a load sharing device according to an embodiment of the present invention.
  • FIG. 6 is another structural diagram of the load sharing device according to the embodiment of the present invention. detailed description
  • the technical solution of the present invention provides a load sharing method, which generates a weight of a load sharing link according to the bandwidth of the load sharing link during the forwarding, and performs load sharing according to the calculated weight.
  • the specific steps of the method are as follows:
  • Step 101 The control plane translates the weight into a weight according to the ratio of the bandwidth information of the corresponding link of the outbound interface of the load sharing item, and sends the forwarding engine through the forwarding engine control interface.
  • the bandwidth of the corresponding link of each load sharing item is: link 1: 2G, link 2: 3G, and link 3: 5G, then the link The weights of 1, 2, and 3 are: 20%, 30%, and 50%.
  • the weight may be generated when the forwarding entry is generated, or may be generated before the forwarding table is generated. If the bandwidth difference between the two links is too large, such as 155M and 10G load sharing, the weight of the 155M port with a small bandwidth can be set to 0 from the convenience of implementation. In this way, load balancing of the control plane degenerates into non-load sharing on the forwarding plane.
  • Step 102 The forwarding engine performs load sharing according to the weight delivered by the control plane.
  • the load will be 20% is allocated to link 1, 30% of the load is assigned to link 2, and 50% of the load is assigned to link 3.
  • the load sharing of the link is allocated according to its bandwidth, which avoids the problem of service quality degradation or service interruption caused by low-speed port congestion when load sharing in different bandwidth links.
  • the weight of the load sharing is obtained according to the ratio of the calculated link bandwidth; or may be calculated according to the link bandwidth according to other fixed algorithms, for example, the delay, jitter, packet loss, etc. of the link may be referred to.
  • the link quality parameter can be used to adjust the load balancing weight.
  • the weight of the load balancing can also be generated according to the user's configuration policy.
  • the configuration policy can be the link operation cost and user competition.
  • the link includes a common physical link and various virtual links.
  • a common physical link may be a specific physical link such as Ethernet or P0S.
  • the virtual link includes an interface link with a route forwarding function that is virtualized after the link is bundled.
  • the link with the route forwarding function is virtualized by various tunnel protocols. .
  • Forwarding entries include FIB (Forwarding Information Base), LIB (Label Information Base), MAC forwarding table, and so on.
  • an embodiment of the present invention discloses a load sharing device, which includes a weight generating module 201 and a load sharing module 202.
  • the weight generating module 201 is configured to generate a weight of the load sharing link, and send the obtained weight to the load sharing module 202.
  • the weights may be calculated according to the bandwidth of the load sharing link, and the weight generating module may be embodied as a weight calculating module 201a, where the weight calculating module 201a is configured to calculate the bandwidth according to the load sharing link.
  • the weight of the load sharing link may be embodied as a weight calculating module 201a, where the weight calculating module 201a is configured to calculate the bandwidth according to the load sharing link. The weight of the load sharing link.
  • the weight calculation module 201a may be a ratio calculation unit, configured to calculate a weight of the load sharing link according to a ratio of bandwidth of the load sharing link.
  • the parameter calculation unit may be configured to calculate a weight of the load sharing link according to the bandwidth and quality parameters of the load sharing link.
  • the weights may be generated according to the configuration of the user.
  • the weight generating module may also be specifically configured as a weight configuration module 201b, configured to generate weights of the load sharing link according to a configuration policy of the user.
  • the weight generating module 201 may further include a non-load sharing module, and when the weight corresponding to the link is less than a set value, the weight is set to zero, so that the chain is The road does not perform load sharing.
  • the load sharing module 202 is configured to receive the weight sent by the weight generating module 201, and perform load sharing on the load sharing link according to the received weight.
  • the above link is a normal link or a virtual link.
  • the technical solution disclosed in the embodiment of the present invention can be combined with the Q0S technology and flexibly selected according to the service type. Whether to use this technology, you can flexibly choose the weight generation strategy when using.
  • the weighting strategy can be used to artificially reduce the correlation.
  • the quality of service for traffic is only one of the more preferred embodiments of the present invention, and the usual variations and alternatives made by those skilled in the art within the scope of the present invention are included in the scope of the present invention.

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

Description

一种负载分担方法及装置
技术领域
本发明涉及网络通信领域， 特别涉及一种负载分担方法及装置。 背景技术
负载分担是一种最为常见的组网方式。 在实际组网应用中， 当传输资源或者端口资源 说
受到限制， 或者在复杂网络部分链路故障的情况下， 可能出现不同带宽的链路进行负载分 担的情况。 这种应用场景中， 转发负载分担时如果不考虑链路的带宽， 在流量较大的时候 可能产生低速链路拥塞导致服务质量下降问题， 甚至可能导致丢报敏感的信令中断而引发 严重的业务中断。 在目前网络设备接口速率不断提高书， 网络中低速口又不能迅速淘汰的情 况下， 这个问题尤其突出。
参见图 1， 为典型网络结构。 节点 R3通过节点 R1和节点 R2分别学习到骨干网络的全网路 由， 在 R3上形成 3路负载分担的转发表项， 出口分别为 2条 GE链路和 1条 2. 5G带宽的 P0S链路。
如果 R3在不区分链路的情况下进行负载分担转发， 则每条链路上的流量是所有上行流 量的 1/3。 这样当上行总流量超过 3G时， 每条链路的流量就会超过 1G， 所以造成了两条 GE链 路拥塞而 2. 5G链路有空余带宽但不能利用的情况。
针对上述问题， 现有技术的解决方案是： 采用链路捆绑技术， 将一组低速接口作为一 个整体来参与高速接口的负载分担。 这种方法在一定程度上解决了上述问题。 但是在低速 接口数量太少而不能捆绑， 或者即使捆绑起来总体带宽与高速接口差距悬殊的情况下， 上 述问题仍然没有得到解决。 另外在网络中部分链路故障时形成的非预先设计的负载分担情 况下， 链路捆绑无法应用。 发明内容
为了克服现有技术中不同带宽链路负载分担情况下低速口拥塞而导致的服务质量下 降甚至业务中断问题，本发明实施例提供了一种负载分担方法及装置，所述技术方案如下： 一种负载分担方法， 所述方法包括以下步骤：
生成负载分担链路的权重；
根据所述权重对所述负载分担链路进行负载分担。
本发明实施例还提供了一种负载分担装置， 所述装置包括权重生成模块和负载分担模 块；
所述权重生成模块用于生成负载分担链路的权重， 并将所述权重发送至所述负载分担 模块；
所述负载分担模块用于接收所述权重生成模块发送的权重， 并根据所述权重对所述负 载分担链路进行负载分担。
本发明实施例通过在不同带宽链路负载分担情况下根据链路的权重进行负载分担， 从 而实现服务质量的控制， 避免了低速口拥塞而导致的服务质量下降甚至业务中断问题。 附图说明
图 1是现有技术中网络负载分担的示意图；
图 2是本发明实施例所述负载分拘方法的流程图；
图 3是本发明实施例所述负载分担装置的结构图；
图 4是本发明实施例所述负载分担装置的另一个结构图；
图 5是本发明实施例所述负载分担装置的另一个结构图；
图 6是本发明实施例所述负载分担装置的另一个结构图。 具体实施方式
下面结合附图和具体实施例对本发明作进一步说明， 但不作为对本发明的限定。 实施例 1
参见图 2， 本发明所述技术方案提供了一种负载分担方法， 在转发时根据负载分担链路 的带宽情况生成负载分担链路的权重，将报文按照计算出的权重进行负载分担。 所述方法具 体步骤如下：
步骤 101 :控制平面根据负载分担项的各个出接口对应链路的带宽信息的比例折算成权 重， 并通过转发引擎控制接口下发转发引擎。 例如， 在有 3 个负载分担的情况下， 每个负 载分担项的出接口对应链路的带宽分别为： 链路 1 : 2G, 链路 2 : 3G, 和链路 3 : 5G, 则链 路 1、 2、 3的权重分别为： 20%， 30%, 50%。
在本步骤中， 权重可以在生成转发表项时产生， 也可以在生成转发表之前产生。 如果两个链路的带宽差距过于悬殊， 比如 155M与 10G负载分担， 从实现的方便性上考 虑可以将带宽小的 155M端口的权重设置为 0。 这样控制平面的负载分担在转发平面就退化 为非负载分担。
步骤 102 : 转发引擎根据控制平面下发的权重来进行负载分担。 在本实施例中， 将负载 的 20%分配给链路 1， 将负载的 30%分配给链路 2， 将负载的 50%分配给链路 3。 通过上述方法， 链路的负载分担是根据其带宽分配的， 避免了在不同带宽链路中负载 分担时， 由于低速口拥塞而导致的服务质量下降甚至业务中断问题。
在本实施例中， 负载分担的权重是根据计算链路带宽的比例得到的； 也可以根据链路 带宽按照其它固定算法计算得来， 例如， 可以参考链路的延时、 抖动、 丢包等链路的质量 参数灵活调整负载分担的权重； 负载分担的权重还可以根据用户的配置策略生成， 该配置 策略可以是链路的运营开销、 用户竞争等策略。
在本实施例中， 链路包括普通物理链路以及各种虚拟链路。 普通物理链路可以是以太、 P0S 等具体的物理链路， 虚拟链路包括链路捆绑后虚拟出来的具有路由转发功能的接口链 路， 各种隧道协议虚拟出来的具有路由转发功能的链路。
转发表项包括 FIB (Forwarding Information Base , 转发信息库）、 LIB (Label Information Base,标签信息库）， MAC转发表等。
实施例 2
参见图 3， 本发明实施例公开了一种负载分担装置， 该装置包括权重生成模块 201和负 载分担模块 202。
其中， 权重生成模块 201 用于生成负载分担链路的权重， 并将获得的权重发送至负载 分担模块 202。
参见图 4， 权重可以根据负载分担链路的带宽， 根据算法计算得到， 权重生成模块可以 具体体现为权重计算模块 201a，该权重计算模块 201a用于根据所述负载分担链路的带宽计 算所述负载分担链路的权重。
其中， 权重计算模块 201a可以为比例计算单元， 用于根据所述负载分担链路的带宽的 比例计算所述负载分担链路的权重。 也可以为参数计算单元， 用于根据所述负载分担链路 的带宽和质量参数计算所述负载分担链路的权重。
参见图 5， 在某些情况下， 可以根据用户的配置产生权重， 因而权重生成模块也可以具 体体现为权重配置模块 201b， 用于根据用户的配置策略生成所述负载分担链路的权重。
参见图 6，对于带宽差距很悬殊的链路，权重生成模块 201还可以包括非负载分担模块， 在链路对应的权重小于设定值时， 将所述权重设为零， 这样对该条链路不进行负载分担。
负载分担模块 202用于接收权重生成模块 201发送的权重， 并根据接收的权重对负载 分担链路进行负载分担。
上述链路为普通链路或虚拟链路。
本发明所述实施例公开的技术方案能够与 Q0S技术进行结合， 根据业务类型灵活选择 是否使用该技术， 使用时能够灵活选择权重生成策略。
提高网络服务质量只是本发明实施例所述技术方案的合理利用之一， 在某些特殊应用 场景下， 比如安全领域的攻击避免方面以及服务提供商企业策略方面， 可以通过权重策略 来人为降低相关流量的服务质量。 以上所述的实施例， 只是本发明较优选的具体实施方式的一种， 本领域的技术人员在 本发明技术方案范围内进行的通常变化和替换都应包含在本发明的保护范围内。

Claims

权 利 要 求 书
1、 一种负载分担方法， 其特征在于， 所述方法包括以下步骤：
生成负载分担链路的权重；
根据所述权重对所述负载分担链路进行负载分担。
2、 如权利要求 1所述的负载分担方法， 其特征在于， 所述生成负载分担链路的权重的 步骤包括： 根据所述负载分担链路的带宽生成所述负载分担链路的权重。
3、 如权利要求 2所述的负载分担方法， 其特征在于， 所述根据所述负载分担链路的带 宽生成所述负载分担链路的权重的步骤包括： 根据所述负载分担链路的带宽的比例计算所 述负载分担链路的权重。
4、 如权利要求 2所述的负载分担方法， 其特征在于， 所述根据所述负载分担链路的带 宽生成所述负载分担链路的权重的步骤包括： 根据所述负载分担链路的带宽和质量参数计 算所述负载分担链路的权重。
5、 如权利要求 1所述的负载分担方法， 其特征在于， 所述生成负载分担链路的权重的 步骤包括： 根据用户的配置策略生成所述负载分担链路的权重。
6、 如权利要求 1-5中任意一项权利要求所述的负载分担方法， 其特征在于， 所述生成 负载分担链路的权重的步骤还包括： 当链路的权重小于设定值时， 将所述权重设为零。
7、 如权利要求 1-5中任意一项权利要求所述的负载分担方法， 其特征在于， 所述链路 为普通链路或虚拟链路。
8、 一种负载分担装置， 其特征在于， 所述装置包括权重生成模块和负载分担模块； 所述权重生成模块用于生成负载分担链路的权重， 并将所述权重发送至所述负载分担 模块；
所述负载分担模块用于接收所述权重生成模块发送的权重， 并根据所述权重对所述负 载分担链路进行负载分担。
9、 如权利要求 8所述的负载分担装置， 其特征在于， 所述权重生成模块具体为权重计 算模块， 用于根据所述负载分担链路的带宽计算生成所述负载分担链路的权重， 并将所述 权重发送至所述负载分担模块。
10、 如权利要求 9所述的负载分担装置， 其特征在于， 所述权重计算模块具体为比例计 算单元， 用于根据所述负载分担链路的带宽的比例计算所述负载分担链路的权重。
11、 如权利要求 9所述的负载分担装置， 其特征在于， 所述权重计算模块具体为参数计 算单元， 用于根据所述负载分担链路的带宽和质量参数计算所述负载分担链路的权重。
12、 如权利要求 8所述的负载分担装置， 其特征在于， 所述权重生成模块具体为权重配 置模块， 用于根据用户的配置策略生成所述负载分担链路的权重， 并将所述权重发送至所 述负载分担模块。
13、 如权利要求 8-12中任意一项权利要求所述的负载分担装置， 其特征在于， 所述权 重生成模块还包括非负载分担模块， 用于在链路的权重小于设定值时， 将所述权重设为零。
14、 如权利要求 8-12中任意一项权利要求所述的负载分担装置， 其特征在于， 所述链 路为普通链路或虚拟链路。
PCT/CN2008/070233 2007-04-12 2008-02-01 A load sharing method and the apparatus Ceased WO2008125030A1 (en)

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