WO2016145737A1 - Load sharing method and device - Google Patents

Abstract

A load sharing method and device. The method comprises: counting, in a first preset time duration and in a first load sharing method, each item of link traffic to obtain a load sharing parameter of a system; and when the load sharing parameter is greater than or equal to a preset load sharing threshold, determining that the load sharing is uneven, and switching to a second load sharing method to allocate traffic to a traffic distribution link to distribute the traffic.

Description

Method and device for realizing load sharing Technical field

This paper relates to the field of data communication, especially a method and device for implementing load sharing.

Background technique

In the router or other products, when the traffic entering the router is greater than the outbound interface bandwidth of the single link of the router, the traffic is offloaded to the outbound interface of multiple links to load the traffic. Distribution requirements.

According to the different traffic distribution modes, the load sharing method is further divided into packet mode load sharing and flow mode load sharing. The load balancing based on the packet mode is to randomly divide the traffic entering the router to the outbound interface of the configured multiple load sharing links. The load balancing based on the flow mode includes the traffic offloading the outbound interfaces of multiple load sharing links. Different from the load sharing based on the packet mode, the load balancing based on the flow mode also needs to ensure that each type of traffic is sent only on the outbound interface of one link, thereby ensuring that the same type of traffic passes through the same path in the network. It ensures that the same kind of traffic is consistent in the order of sending and receiving in the data transmission process. Specifically, the load sharing method based on the packet mode mainly maps the traffic that needs load sharing to the outbound interface of the N links of the load sharing by using the generated random value. This method can increase the number of bits of the random value. The effect of load sharing is better and even. The load balancing method based on the flow mode is complex. You need to select different types of flow identifiers for different types of packets. For example, the fourth version (IPV4) of the Internet Protocol can select the source IP address, destination IP address, and protocol number. The service type (TOS), the source port number, the destination port number, and the like are used as the flow identifier. After the flow identifier type is determined, the algorithm maps to 0 to (N-1) links, where N is the link. Finally, the hash identifier is unified by the hash (HASH) algorithm to obtain the HASH result, and then the value obtained by the HASH result modulo N is used to select the number of links.

The load balancing method based on the flow mode has a lot of limitations. The key to the uniformity of load sharing lies in the following points: 1. The identifier field of the stream is selected, that is, how to classify the stream identifiers of different streams; 2. The mapping function The selection of the stream identifier is how to map it to a finite value range of 0 to N-1 (N is the number of links). The selection of the stream identifier does not apply. For all scene requirements, direct HASH operations cannot be evenly mapped onto the link based on the selected stream identifier. For example, suppose the source IP in the IPV4 packet in the current scenario is unchanged, the destination IP changes in the lower 16 bits, the TOS field changes between several finite values, and the port number is in a larger interval 5000-65535. Change; assume that all flow identifiers are mapped by HASH operation result. Since the source IP does not change, there is no need to add a flow identifier; the destination IP is not necessary to take all 32-bit calculations in the lower 16-bit change; the value between IP and port number The distribution of HASH calculation results is also unpredictable; therefore, the above load sharing method cannot achieve equalization of traffic.

The key to the load sharing method is how to distinguish and collect the traffic types and map them to 0 to N-1 links. The related technology uses the keyword static mapping method, which has uneven sharing and causes some traffic entering the router. The outbound interface bandwidth of a single link that is still larger than the router; especially when the number of links or traffic types is small, the load sharing is more severe.

Summary of the invention

This document provides a method and system for implementing load sharing, which can improve the load sharing unevenness and make the load sharing of each link even and reasonable. After the load sharing, the bandwidth of each link meets the bandwidth requirement of traffic offloading.

A method for implementing load sharing, comprising:

Counting each link traffic under the first load sharing method for the first preset duration, and obtaining a load sharing parameter of the system;

When the load sharing parameter is greater than or equal to the preset load sharing threshold, the load sharing is determined to be uneven, and the second load sharing method is configured to distribute the traffic to the traffic distribution link for traffic distribution.

Optionally, the first load sharing method includes:

Pre-set protocols based on the interconnection between source networks, SIP, or protocol-based DIP based on interconnection between destination networks, or based on user datagram protocol UDP port numbers, or based on triples, or based on quintuple, or based on Cyclic Redundancy Check Code CRC, or XOR-based static mapping method.

Optionally, obtaining load sharing parameters of the system includes:

Divide the traffic of each link by the bandwidth of each link to obtain the corresponding value of each link. Traffic bandwidth ratio

The load sharing parameter is obtained by subtracting the minimum value of the traffic bandwidth ratio from the maximum value in the traffic bandwidth ratio.

Optionally, the method for sharing the second load includes:

And sampling the traffic to be distributed by the load sharing in the second preset duration according to the preset ratio;

Analyzing a type of sampling traffic and obtaining a first ratio of sampling traffic of each type of traffic, and calculating a second ratio of each link bandwidth in the link to a total bandwidth of all links distributed by the traffic;

Traffic is distributed to each link based on the size of the first ratio and the second ratio.

Optionally, distributing traffic to each link according to the size of the first ratio and the second ratio includes:

After sorting each type of traffic and link according to the first ratio and the second ratio, respectively, assigning each type of traffic to the second ratio from small to large according to the order of the first ratio up to the first ratio being the smallest. In each link.

Optionally, each type of traffic is allocated to each of the links whose second ratio is from small to large in an order that the first ratio is up to the first ratio is the smallest:

After sorting each type of traffic and links according to the first ratio and the second ratio, respectively, each type of traffic is allocated one by one according to the first ratio, from the largest to the smallest, to the second smallest link. ;

Calculating an accumulated sum of the first ratios of each type of traffic assigned to the link having the smallest second ratio, subtracting the second ratio of the link having the smallest second ratio from the calculated sum obtained and obtaining the difference, according to The obtained difference determines whether to continue to distribute the distributed traffic to the link;

When the allocation of traffic to the link is stopped, the link is removed from the ordering of the distributed distribution traffic, and the size ratio of the first ratio of each type of traffic that is not allocated is updated and the second ratio of the unallocated links is sorted. The traffic distribution allocation of each type of traffic is continued with the updated first ratio order and the second ratio sorting until each link is unassigned, and unassigned each type of traffic is uniformly allocated to the remaining links.

Optionally, determining whether to continue to distribute the distributed traffic to the link according to the obtained difference includes:

After subtracting the calculated second sum of the first ratio of the traffic of each type of the link assigned to the second smallest ratio, the second ratio of the link having the smallest second ratio is obtained, and when the difference is equal to zero, The traffic distribution of the link is stopped. When the difference is less than zero, the corresponding type of traffic that is less than zero is used as the unallocated traffic, and the traffic is allocated to the link.

Optionally, when the load sharing parameter is less than a preset load sharing threshold, the method further includes:

The first load sharing method is used for traffic distribution.

Optionally, after switching to the second load sharing method for traffic distribution, the method further includes:

The traffic is distributed to the link of the traffic distribution, the corresponding ACL rule is delivered, and the traffic is distributed according to the ACL rule.

The ACL rule is an ACL quintuple, which is delivered through a content-addressable memory TCAM or a prefix tree trie table.

Optionally, when performing traffic distribution, the method further includes:

When the ACL rule does not match the traffic distribution, the first load balancing is used for the traffic of the type, and the number of traffic types of the first load sharing traffic is counted. When the number of the traffic traffic types is greater than the matching adjustment threshold. And distributing the traffic of the second load by using the second load sharing method for the undistributed traffic.

An apparatus for implementing load sharing, comprising: a statistical analysis unit and a judgment processing unit; wherein

The statistical analysis unit is configured to: collect statistics on each link under the first load sharing method in the first preset duration, and obtain a load sharing parameter of the system;

The judgment processing unit includes a judgment module and a processing module; wherein

The determining module is configured to: determine that the load sharing is uneven when the load sharing parameter is greater than or equal to a preset load sharing threshold;

The processing module is configured to: when determining the load sharing unevenness, switch to the second load sharing method to distribute the traffic to the traffic distribution link for traffic distribution.

Optionally, the statistical analysis unit is set to:

Counting the first preset duration within a pre-set SIP-based, or DIP-based, or UDP-based port number, or triple-based, or quintuple-based, or CRC-based, or XOR-based static mapping method Link traffic, get the load sharing parameters of the system.

Optionally, the statistical analysis unit is set to:

Dividing the traffic of each link of the statistics by the bandwidth of each link itself to obtain a corresponding traffic bandwidth ratio of each link;

The load sharing parameter is obtained by subtracting the minimum value of the traffic bandwidth ratio from the maximum value in the traffic bandwidth ratio.

Optionally, the processing module is configured to: when determining load sharing unevenness,

And sampling the traffic to be distributed by the load sharing in the second preset duration according to the preset ratio;

Analyzing a type of sampling traffic and obtaining a first ratio of sampling traffic of each type of traffic, and calculating a second ratio of each link bandwidth in the link to a total bandwidth of all links distributed by the traffic;

Traffic is distributed to each link for traffic distribution according to the size of the first ratio and the second ratio.

Optionally, the processing module is configured to: when determining load sharing unevenness,

And sampling the traffic to be distributed by the load sharing in the second preset duration according to the preset ratio;

Analyzing a type of sampling traffic and obtaining a first ratio of sampling traffic of each type of traffic, and calculating a second ratio of each link bandwidth in the link to a total bandwidth of all links distributed by the traffic;

After sorting each type of traffic and link according to the first ratio and the second ratio, respectively, assigning each type of traffic to the second ratio from small to large according to the order of the first ratio up to the first ratio being the smallest. In each link.

Optionally, the processing module is configured to: when determining load sharing unevenness,

And sampling the traffic to be distributed by the load sharing in the second preset duration according to the preset ratio;

Analyzing a type of sampling traffic and obtaining a first ratio of sampling traffic of each type of traffic, and calculating a second ratio of each link bandwidth in the link to a total bandwidth of all links distributed by the traffic;

After sorting each type of traffic and links according to the first ratio and the second ratio, respectively, each type of traffic is allocated one by one according to the first ratio, from the largest to the smallest, to the second smallest link. ;

Calculating an accumulated sum of first ratios of each type of traffic assigned to the link having the smallest second ratio, and subtracting the calculated second sum from the second ratio to obtain the difference obtained by the calculation Determining whether to continue distributing the distributed traffic to the link according to the obtained difference;

When the allocation of traffic to the link is stopped, the link is removed from the ordering of the distributed distribution traffic, and the size ratio of the first ratio of each type of traffic that is not allocated is updated and the second ratio of the unallocated links is sorted. The traffic distribution allocation of each type of traffic is continued with the updated first ratio order and the second ratio sorting until each link is unassigned, and unassigned each type of traffic is uniformly allocated to the remaining links.

Optionally, the processing module is configured to: when determining load sharing unevenness,

And sampling the traffic to be distributed by the load sharing in the second preset duration according to the preset ratio;

Analyzing a type of sampling traffic and obtaining a first ratio of sampling traffic of each type of traffic, and calculating a second ratio of each link bandwidth in the link to a total bandwidth of all links distributed by the traffic;

After sorting each type of traffic and links according to the first ratio and the second ratio, respectively, each type of traffic is allocated one by one according to the first ratio, from the largest to the smallest, to the second smallest link. ;

The second ratio of the link having the smallest second ratio is subtracted from the calculated sum of the first ratios of the flow rates of each type of the link assigned to the link with the smallest second ratio, and then the difference is obtained when the difference is equal to zero. The traffic distribution of the link; when the difference is less than zero, the corresponding type of traffic when the value is less than zero is used as the unallocated traffic, and the traffic is allocated to the link;

When the allocation of traffic to the link is stopped, the link is removed from the ordering of the distributed distribution traffic, and the size ratio of the first ratio of each type of traffic that is not allocated is updated and the second ratio of the unallocated links is sorted. The traffic distribution allocation of each type of traffic is continued with the updated first ratio order and the second ratio sorting until each link is unassigned, and unassigned each type of traffic is uniformly allocated to the remaining links.

Optionally, the determining module is further configured to: when the load sharing parameter is less than a preset load sharing threshold, determine that the load sharing is uniform;

The processing module is further configured to: when determining load sharing is uniform, use the first load sharing method to perform traffic distribution.

Optionally, the device further includes a rule sending unit, configured to: after switching to the second load sharing method for traffic distribution, assigning a corresponding ACL according to the traffic distribution to the traffic distribution link Rules, traffic distribution based on ACL rules;

The ACL rule is ACL quintuple and is delivered through the content-addressable memory TCAM or the prefix tree trie table.

Optionally, the device further includes a statistical processing unit, configured to: when performing traffic distribution,

When the ACL rule does not match the traffic distribution, the first load balancing is used for the traffic of the type, and the number of traffic types of the first load sharing traffic is counted. When the number of the traffic traffic types is greater than the matching adjustment threshold. And distributing the traffic of the second load by using the second load sharing method for the undistributed traffic.

A computer readable storage medium storing computer executable instructions for performing the method of any of the above.

Compared with the related art, the technical solution of the present invention includes: collecting the traffic of each link in the first load sharing method for the first preset duration, and obtaining the load sharing parameter of the system; when the load sharing parameter is greater than or equal to the preset load sharing At the threshold, the load sharing is determined to be uneven, and the second load sharing method is configured to distribute the traffic to the traffic distribution link for traffic distribution. In the embodiment of the present invention, when the load sharing parameter exceeds the load sharing threshold, the second load sharing method is used to solve the problem of uneven load sharing; further, each type of traffic is allocated from large to small to link bandwidth from small to large. The link, the last unallocated traffic is digested by the largest link, which solves the problem of uneven load sharing.

BRIEF abstract

FIG. 1 is a flowchart of a method for implementing load sharing according to an embodiment of the present invention;

2 is a structural block diagram of an apparatus for load sharing according to an embodiment of the present invention;

Figure 3 is a flow chart of the method of the first embodiment of the present invention.

Embodiments of the invention

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, in the case of no conflict, the features in the embodiments and the embodiments herein may be arbitrarily combined with each other.

FIG. 1 is a flowchart of a method for implementing load sharing according to an embodiment of the present invention. As shown in FIG. 1 , the method includes:

Step 100: Collect each link traffic under the first load sharing method for the first preset duration, and obtain a load sharing parameter of the system.

It should be noted that the size of the traffic in the statistical link belongs to the conventional technical means of those skilled in the art.

In this step, the load sharing parameters are:

Dividing the traffic of each link by the bandwidth of each link itself to obtain the corresponding traffic bandwidth ratio of each link;

The load sharing parameter is obtained by subtracting the minimum value of the traffic bandwidth ratio from the maximum value in the traffic bandwidth ratio.

In this step, the first load sharing method includes:

Pre-set protocols based on interconnection between source networks (SIP), or protocols based on interconnection between destination networks (DIP), or based on User Datagram Protocol (UDP) port numbers, or based on triples, or based on A quintuple, or a cyclic redundancy check code (CRC), or an XOR-based static mapping method.

Step 101: When the load sharing parameter is greater than or equal to the preset load sharing threshold, determine that the traffic is unevenly distributed in the link, and switch to the second load sharing method to distribute the traffic to the traffic distribution link for traffic distribution.

When the load sharing parameter is less than a preset load sharing threshold, the method further includes:

The first load sharing method is used for traffic distribution.

It should be noted that the first preset duration is mainly determined according to the type and quantity of the traffic shared by the load. The more the general types and the larger the number of traffic distribution processes, the smaller the first preset duration may be. The value of the load sharing threshold is set based on the quality of the load sharing, the link bandwidth, and the traffic volume. If the load sharing requirement is high, the load sharing threshold is low, and vice versa. When switching to the second load sharing method, it is generally necessary to sacrifice some system performance. Therefore, the load sharing threshold is analyzed and set according to system performance and load sharing requirements, and can be adjusted according to actual conditions.

In general, the first preset duration that meets the sharing should be reasonable within the range of 10 minutes to 2 hours, and the threshold should not exceed 5%. In special cases, the load sharing flow rate is large and the load flow rate is stable. On the premise, the first preset duration can be set to a minimum value of 10 minutes, and when the flow rate is small, the first preset duration can be set to 30 minutes. When the bandwidth of the link is large, the load sharing threshold is set to a maximum value of 5%. The link bandwidth is close to 1:1. At this time, it is appropriate to set the load sharing threshold to 0.1%.

In this step, the method for sharing the second load includes:

Sampling the traffic to be distributed by the load sharing in the second preset duration according to the preset ratio; analyzing the type of the sampling traffic and obtaining the first ratio of the sampling traffic of each type of traffic, and calculating the bandwidth of each link in the link The second ratio of the total bandwidth of all links distributed by the traffic;

Traffic is distributed to each link based on the size of the first ratio and the second ratio.

Optionally, distributing traffic to each link according to the first ratio and the second ratio includes:

After sorting each type of traffic and link according to the first ratio and the second ratio, respectively, assigning each type of traffic to the second ratio from small to large according to the order of the first ratio up to the first ratio being the smallest. In each link.

Optionally, each type of traffic is allocated to each of the links whose second ratio is from small to large according to the order that the first ratio is up to the first ratio is the smallest:

After sorting each type of traffic and links according to the first ratio and the second ratio, respectively, each type of traffic is allocated one by one according to the first ratio, from the largest to the smallest, to the second smallest link. ;

Calculating an accumulated sum of the first ratios of each type of traffic assigned to the link having the smallest second ratio, subtracting the calculated second sum ratio of the second ratio from the calculated accumulated sum and obtaining the difference, according to the obtained The difference determines whether to continue to distribute the distributed traffic to the link;

When the allocation of traffic to the link is stopped, the link is removed from the ordering of the distributed distribution traffic, and the size ratio of the first ratio of each type of traffic that is not allocated is updated and the second ratio of the unallocated links is sorted. The traffic distribution allocation of each type of traffic is continued with the updated first ratio order and the second ratio sorting until each link is unassigned, and unassigned each type of traffic is uniformly allocated to the remaining links.

Optionally, determining, according to the obtained difference, whether to continue to distribute the distributed traffic to the link includes: The second ratio of the link having the smallest second ratio is subtracted from the calculated sum of the first ratios of the flow rates of each type of the link assigned to the link with the smallest second ratio, and then the difference is obtained when the difference is equal to zero. Traffic is allocated to the link; when the difference is less than zero, the corresponding type of traffic that is less than zero is used as unallocated traffic, and traffic is allocated to the link.

It should be noted that when performing the load sharing method, it is often necessary to distinguish the load sharing data of different paths. Generally, the flow keyword virtual private network function number (VPN ID) plus DIP or other load that can distinguish different paths can be used. The shared traffic data is a common knowledge of those skilled in the art.

The preset ratio when sampling is set according to the quality requirements of the second load sharing method and the type and quantity of traffic distributed by the system. Generally, the higher the required quality, the larger the preset ratio, but the larger the type and quantity of traffic. Using a high preset ratio to sample a large amount of traffic data will affect certain system performance. Therefore, it is set according to actual needs and system performance. It can be passed. When the current flow rate of the system device accounts for less than 50% of the maximum flow speed, the preset ratio can be set to 1:1. At this time, the impact on the operation of the system equipment is small, and the high sampling ratio can be set. The second preset duration can be set to a smaller value (such as 10 minutes); when the current flow rate of the system device accounts for 80% of the maximum flow velocity, the preset ratio of the sampling can be set to not exceed 4:1. Considering the normal flow rate, set the preset ratio to 10:1 and the second preset duration to 30 minutes. When the current flow rate of the system device accounts for 99% of the maximum flow rate, the preset ratio can be set. For the case of no more than 100:1, consider the normal flow rate, set the preset ratio to 1000:1 and the second preset duration to 120 minutes. If the message flow speed is very large, you can set the preset ratio to 100. :1 and the second preset duration is 60 minutes; the primary reference factor of the second preset duration is the same as the reference factor of the first preset duration.

After switching to the second load sharing method for performing traffic distribution, the method of the embodiment of the present invention further includes:

Distribute the traffic according to the ACL rule based on the traffic distribution to the traffic distribution link and the corresponding access control list (ACL) rules.

The ACL rule is an ACL five-tuple, which is delivered through a content-addressable memory (TCAM) or a prefix tree (trie) table.

The method of the embodiment of the present invention further includes:

When the ACL rule does not match the traffic distribution, the first load balancing is used for the traffic of the type, and the number of traffic types of the first load sharing traffic is counted. When the number of the traffic traffic types is greater than the matching adjustment threshold. And distributing the traffic of the second load by using the second load sharing method for the undistributed traffic.

It should be noted that the matching adjustment threshold is mainly related to the system's uniform requirement for load sharing. The higher the requirement, the smaller the adjustment value is. When the requirement is low, the value can be set to be 0.1% to 5%. For a scenario with a large number of links with redundant bandwidth, the system does not have a bad impact on the system traffic. In this case, you can set the matching adjustment threshold to a larger value of 5%. When it is small, if the 10M stream passes through the 10G bandwidth, the matching adjustment threshold can be set to a maximum value of 5%. When the load-sharing traffic is close to the link bandwidth, the load sharing uniformity is required to be strict. Otherwise, one link traffic may be excessively allocated and the other links may be redundant. In the case of the remaining bandwidth, such as the load sharing traffic and the total link bandwidth ratio of 99:100, the matching adjustment threshold is required to be a small value, for example, 0.1%.

In the method of the embodiment of the present invention, when the load sharing parameter exceeds the load sharing threshold, the second load sharing method is adopted, and each type of traffic is allocated to the second ratio from small to large according to the order of the first ratio to the first ratio being the smallest. In each link, each link load is evenly distributed. Further, each type of traffic is allocated from the largest to the smallest link to the link bandwidth from small to large, and the last unallocated traffic passes the second ratio. The maximum link bandwidth is digested, which solves the problem of uneven load sharing.

2 is a structural block diagram of a system for implementing load sharing according to an embodiment of the present invention. As shown in FIG. 2, the method includes: a statistical analysis unit 21 and a determination processing unit 22;

The statistical analysis unit 21 is configured to: collect each link traffic under the first load sharing method for the first preset duration, and obtain a load sharing parameter of the system;

The determination processing unit 22 includes a determination module 221 and a processing module 222;

The determining module 221 is configured to: determine that the load sharing is uneven when the load sharing parameter is greater than or equal to a preset load sharing threshold;

The processing module 222 is configured to switch to the second load sharing when determining the load sharing unevenness The method distributes traffic to the traffic distribution link for traffic distribution.

Optionally, the statistical analysis unit 21 is configured to:

Counting the first preset duration within a pre-set SIP-based, or DIP-based, or UDP-based port number, or triple-based, or quintuple-based, or CRC-based, or XOR-based static mapping method Link traffic, get the load sharing parameters of the system.

The statistical analysis unit 21 is set to:

Dividing the traffic of each link by the bandwidth of each link itself to obtain the corresponding traffic bandwidth ratio of each link;

The load sharing parameter is obtained by subtracting the minimum value of the traffic bandwidth ratio from the maximum value in the traffic bandwidth ratio.

The processing module 222 is configured to: when determining the load sharing unevenness, sample the traffic to be distributed according to the load sharing in the second preset duration according to the preset ratio;

Analyzing a type of sampling traffic and obtaining a first ratio of sampling traffic of each type of traffic, and calculating a second ratio of each link bandwidth in the link to a total bandwidth of all links distributed by the traffic;

Traffic is distributed to each link for traffic distribution according to the size of the first ratio and the second ratio.

Optionally, the processing module 222 is configured to: when determining load sharing unevenness,

And sampling the traffic to be distributed by the load sharing in the second preset duration according to the preset ratio;

Analyzing a type of sampling traffic and obtaining a first ratio of sampling traffic of each type of traffic, and calculating a second ratio of each link bandwidth in the link to a total bandwidth of all links distributed by the traffic;

After sorting each type of traffic and link according to the first ratio and the second ratio, respectively, assigning each type of traffic to the second ratio from small to large according to the order of the first ratio up to the first ratio being the smallest. In each link.

Optionally, the processing module 222 is configured to: when determining load sharing unevenness,

And sampling the traffic to be distributed by the load sharing in the second preset duration according to the preset ratio;

Analyzing a type of sampling traffic and obtaining a first ratio of sampling traffic of each type of traffic, and calculating a second ratio of each link bandwidth in the link to a total bandwidth of all links distributed by the traffic;

Sort each type of traffic and link according to the first ratio and the second ratio After that, each type of traffic is allocated one by one according to the first ratio size from the largest to the smallest, to the link with the smallest second ratio;

Calculating an accumulated sum of the first ratios of each type of traffic assigned to the link having the smallest second ratio, subtracting the second ratio of the link having the smallest second ratio from the calculated sum obtained and obtaining the difference, according to The obtained difference determines whether to continue to distribute the distributed traffic to the link;

When the allocation of traffic to the link is stopped, the link is removed from the ordering of the distributed distribution traffic, and the size ratio of the first ratio of each type of traffic that is not allocated is updated and the second ratio of the unallocated links is sorted. The traffic distribution allocation of each type of traffic is continued with the updated first ratio order and the second ratio sorting until each link is unassigned, and unassigned each type of traffic is uniformly allocated to the remaining links.

The processing module 222 is configured to: when determining load sharing unevenness,

And sampling the traffic to be distributed by the load sharing in the second preset duration according to the preset ratio;

Analyzing a type of sampling traffic and obtaining a first ratio of sampling traffic of each type of traffic, and calculating a second ratio of each link bandwidth in the link to a total bandwidth of all links distributed by the traffic;

After sorting each type of traffic and links according to the first ratio and the second ratio, respectively, each type of traffic is allocated one by one according to the first ratio, from the largest to the smallest, to the second smallest link. ;

The second ratio of the link having the smallest second ratio is subtracted from the calculated sum of the first ratios of the flow rates of each type of the link assigned to the link with the smallest second ratio, and then the difference is obtained when the difference is equal to zero. The traffic distribution of the link; when the difference is less than zero, the corresponding type of traffic when the value is less than zero is used as the unallocated traffic, and the traffic is allocated to the link;

When the allocation of traffic to the link is stopped, the link is removed from the ordering of the distributed distribution traffic, and the size ratio of the first ratio of each type of traffic that is not allocated is updated and the second ratio of the unallocated links is sorted. The traffic distribution allocation of each type of traffic is continued with the updated first ratio order and the second ratio sorting until each link is unassigned, and unassigned each type of traffic is uniformly allocated to the remaining links.

In the device of the embodiment of the present invention, the determining module 221 is further configured to: when the load sharing parameter is less than a preset load sharing threshold, determine that the load sharing is uniform;

The processing module 222 is further configured to perform traffic distribution by using the first load sharing method when determining that the load sharing is uniform.

The device of the embodiment of the present invention further includes a rule issuing unit 23, configured to: after switching to the second load sharing method for traffic distribution, assigning the corresponding ACL rule according to the traffic distribution to the traffic distribution link, according to the ACL rule Traffic distribution;

The ACL rule is an ACL five-tuple, which is delivered through a content-addressable memory (TCAM) or a prefix tree (trie) table.

The apparatus of the embodiment of the present invention further includes a statistical processing unit 24, configured to: when performing traffic distribution,

When the ACL rule does not match the traffic distribution, the first load balancing is used for the traffic of the type, and the number of traffic types of the first load sharing traffic is counted. When the number of the traffic traffic types is greater than the matching adjustment threshold. And distributing the traffic of the second load by using the second load sharing method for the undistributed traffic.

The working process of the embodiment of the present invention will be described below by way of examples.

Example 1

3 is a flow chart of the method of the first embodiment of the present invention, as shown in FIG.

Step 300: Perform a traffic sampling of the second load sharing method by using a preset ratio of 1:1.

In this step, the preset ratio is set to 1:1, indicating that the quality requirement of the second load sharing method is high. In addition, in this embodiment, the flow keyword virtual private network function number (VPN ID) plus DIP identification implementation is implemented. For example, traffic data processed by the second load sharing method is required.

Step 301: Write the sampled traffic data into the buffer, analyze the type of the sampled traffic, and obtain a first ratio of the sampled traffic of each type of traffic;

Step 302: Calculate a second ratio of the bandwidth of each link in the link to the total bandwidth of all links distributed by the traffic.

Step 303: Distribute each type of traffic in a corresponding link according to the second load sharing method, including:

After sorting each type of traffic and links according to the first ratio and the second ratio, respectively, each type of traffic is allocated one by one according to the first ratio from the largest to the smallest. In the link with the smallest ratio, the value of the sum of the first ratios of each type of traffic assigned to the second ratio of the second ratio minus the second ratio is determined to determine whether to continue to distribute the distributed traffic to the link; When the allocation of traffic to the link is stopped, the link is removed from the ordering of the distributed distribution traffic, and the size ratio of the first ratio of each type of traffic that is not allocated is updated and the second ratio of the unallocated links is sorted. And arranging the traffic distribution distribution of each type of traffic by the updated first ratio ordering and the second ratio sorting, until only one link remains, and unassigned each type of traffic is uniformly allocated to the remaining links; Determining whether to continue to distribute traffic to the link according to a value of a sum of the first ratios of each type of traffic assigned to the second ratio of the link having the smallest second ratio, including: a link that minimizes the second ratio The second ratio minus the sum of the first ratios of each type of traffic assigned to it obtains a corresponding difference, and when the difference is equal to zero, stops distributing traffic to the link; when the difference is less than zero, it is small Type flow rate as a flow rate corresponding to zero unallocated, allocate traffic to stop the link.

Step 304: After the traffic is distributed to the second load balancing method, the ACL rule is delivered according to the ACL rule.

Step 305: Perform ACL rule matching, and perform ACL rule matching when the link performs traffic distribution. When the ACL matching result is yes, the traffic distribution is performed according to step 3060, which is equivalent to using the second load method to complete the traffic distribution. Otherwise, step 3070 is performed.

Step 3060: Perform traffic distribution according to an ACL rule.

Step 3070: The first load sharing offload is used for the traffic that does not match the ACL rule, and the number of types of traffic that is divided by the first load is used.

Step 3071: If the number of types of traffic that uses the first load sharing offload is greater than the matching adjustment threshold, step 300 is performed, otherwise, step 3072 is performed.

Step 3072: Perform traffic distribution according to the first load sharing method.

Example 2

The number of links for traffic load sharing is 3, and the link bandwidth ratio of the three links is 1:2:1.

The traffic of the packet is IP traffic. Based on the SIP change, there are 255 traffic types from 10.10.10.0 to 10.10.10.254.

The first load sharing method is a method of the CRC32 mod logical linknum link number of the source IP. Here, the physical linknum=3 logical linknum=1+2+1=4, after the above modulo, the determined score Flow to three links.

Assume that the first preset duration is 10 minutes, and the load sharing threshold (the deviation between the link maximum load and the link minimum load) is 0.05;

During the first preset duration, the traffic of the three links is counted as 6200000, 12800000, and 6400000 respectively under the first load sharing method;

Dividing the number of traffic-sharing traffic of each link by the link bandwidth yields a traffic bandwidth ratio of (62/64), 1 and 1, respectively.

The calculation load sharing parameter is: the difference between the maximum value of the flow bandwidth ratio and the minimum value of the flow bandwidth ratio is 1-(62/64)=1/32<0.05, and the load sharing effect is considered to be uniform, and the first load sharing method is maintained.

The first load sharing method described above requires high sampling performance because it does not need to sample complex statistics and delivery processes, and needs to be prioritized. Maintaining the first load sharing method is a scheme for performing traffic distribution in the implementation scenario. After all, when switching from the first load sharing method to the second load sharing method, it is necessary to lose part of the system performance in order to obtain a uniform load sharing effect.

Example 3

The number of links for traffic load sharing is 3, and the link bandwidth ratio of the three links is 1:2:1.

The traffic of the packet is IP traffic. Based on the SIP change, there are 10 types of traffic from 10.10.10.0 to 10.10.10.9.

10 kinds of flow rates from 20.20.20.0 to 20.20.20.9 based on DIP changes;

Based on the TCP source interface (sport) change from 0 to 9 destination interfaces (dport) 0 to 9 total changes 10 * 10 * 10 * 10 = 10000 kinds of traffic;

Assume that the flow rate of each stream is the same.

The first load sharing method is CRC32 (keyword includes sip, dip, sport, dport) mod linknum, where physical linknum=3, logical linknum=1+2+1=4, and the traffic is diverted to the result after modulo Three links

Assume that the first preset duration is 10 minutes and the load sharing threshold is 0.01;

During the first preset duration, the traffic of the three links is counted as 6200000, 12800000, and 6400000 respectively under the first load sharing method;

Dividing the number of traffic-sharing traffic of each link by the link bandwidth yields a traffic bandwidth ratio of (62/64), 1 and 1, respectively.

The load sharing parameter is calculated as follows: the difference between the maximum value of the flow bandwidth ratio and the minimum value of the flow bandwidth ratio is 1-(62/64)=1/32 is greater than 0.01; therefore, the load sharing is determined to be uneven, and the second load sharing method is switched;

The traffic to be distributed by the load sharing in the second preset duration is sampled according to the preset ratio; here, the preset ratio is 1. The second preset duration is 10 minutes.

After 10 minutes, the sampling analysis obtained 9900 kinds of flow, and the first ratio of each flow was from 1/9900, 1/9900, 1/9900...1/9900, respectively;

The second ratio of the link bandwidth of the three links is 0.25:0.5:0.25;

According to the second load sharing method, after sorting each type of traffic, the largest traffic 1/9900 is allocated to the minimum remaining bandwidth link 0.25 which is just satisfied, and the second ratio is reduced by 0.25 each time one type of traffic is allocated. The first ratio of the traffic of the type is obtained, and the difference is obtained until the difference is zero, and the traffic is allocated to the link; when less than zero occurs, the traffic allocated when the value is less than zero is used as the initial traffic of the next link distribution traffic. When the allocation of traffic to the link is stopped, the link is removed from the ordering of the traffic distribution, the updated unallocated first ratio ordering of each type of traffic and the second ratio ordering of the unassigned links continue unallocated Traffic distribution for each type of traffic; when there is only one link left, all unassigned traffic of each type is assigned to the remaining links; thus distributing 2475 traffic types to the first of the second ratio of 0.25 Link; after updating the first ratio and the second ratio, the other link allocation with the second ratio of 0.25 continues to allocate 2475 traffic, and the link with the second ratio of 0.5 is allocated the remaining 4950 traffic. The split ratio perfectly satisfies the link bandwidth ratio of 1:2:1,

After traffic distribution is complete, ACL rules are delivered for traffic distribution.

When the ACL rule of the type of traffic distribution does not match, the first load balancing is used for the traffic of the type, and the number of traffic types of the traffic that is divided by the first load is used. When the number of traffic types is greater than the preset threshold, The traffic distribution is performed by re-using the second load sharing method for the undistributed traffic.

Assume that the actual traffic entry type is 10000, and 100 routes match the ACL. If the traffic cannot be distributed through the second load sharing method, the static quintuple algorithm is used to map. Diversion. The matching adjustment threshold of the second load sharing method is set to 10.1%, and the 100/10000 ratio is less than 10.1%. Therefore, it is not necessary to re-use the second load sharing method for traffic distribution. The traffic distribution of the 100 types of flows according to the first load sharing method has little effect on the load sharing of the overall traffic distribution.

One of ordinary skill in the art will appreciate that all or a portion of the steps of the above-described embodiments can be implemented using a computer program flow, which can be stored in a computer readable storage medium, such as on a corresponding hardware platform (eg, The system, device, device, device, etc. are executed, and when executed, include one or a combination of the steps of the method embodiments.

Alternatively, 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.

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.

Industrial applicability

In the embodiment of the present invention, when the load sharing parameter exceeds the load sharing threshold, the second load sharing method is used to solve the problem of uneven load sharing; each type of traffic is allocated from the largest to the smallest link to the link bandwidth from small to large. Finally, the unallocated traffic is digested through the largest link, which solves the problem of uneven load sharing.

Claims (21)

1. A method for implementing load sharing, comprising:

   Counting each link traffic under the first load sharing method for the first preset duration, and obtaining a load sharing parameter of the system;

   When the load sharing parameter is greater than or equal to the preset load sharing threshold, the load sharing is determined to be uneven, and the second load sharing method is configured to distribute the traffic to the traffic distribution link for traffic distribution.
2. The method of claim 1, wherein the first load sharing method comprises:

   Pre-set protocols based on the interconnection between source networks, SIP, or protocol-based DIP based on interconnection between destination networks, or based on user datagram protocol UDP port numbers, or based on triples, or based on quintuple, or based on Cyclic Redundancy Check Code CRC, or XOR-based static mapping method.
3. The method of claim 1 wherein the load sharing parameters of the obtaining system comprise:

   Dividing the traffic of each link of the statistics by the bandwidth of each link itself to obtain a corresponding traffic bandwidth ratio of each link;

   The load sharing parameter is obtained by subtracting the minimum value of the traffic bandwidth ratio from the maximum value in the traffic bandwidth ratio.
4. The method according to any one of claims 1 to 3, wherein the sharing method of the second load comprises:

   And sampling the traffic to be distributed by the load sharing in the second preset duration according to the preset ratio;

   Analyzing a type of sampling traffic and obtaining a first ratio of sampling traffic of each type of traffic, and calculating a second ratio of each link bandwidth in the link to a total bandwidth of all links distributed by the traffic;

   Traffic is distributed to each link based on the size of the first ratio and the second ratio.
5. The method of claim 4, wherein the distributing the traffic to each of the links according to the size of the first ratio and the second ratio comprises:

   After each type of traffic and links are sorted according to the first ratio and the second ratio, respectively, each type of traffic is allocated to the second according to the order of the first ratio and the first ratio being the smallest. The ratio is from small to large in each link.
6. The method according to claim 5, wherein said assigning each type of traffic to each of the links whose second ratio is from small to large in the order that the first ratio is up to the first ratio is the smallest:

   After sorting each type of traffic and links according to the first ratio and the second ratio, respectively, each type of traffic is allocated one by one according to the first ratio, from the largest to the smallest, to the second smallest link. ;

   Calculating an accumulated sum of the first ratios of each type of traffic assigned to the link having the smallest second ratio, subtracting the second ratio of the link having the smallest second ratio from the calculated sum obtained and obtaining the difference, according to The obtained difference determines whether to continue to distribute the distributed traffic to the link;

   When the allocation of traffic to the link is stopped, the link is removed from the ordering of the distributed distribution traffic, and the size ratio of the first ratio of each type of traffic that is not allocated is updated and the second ratio of the unallocated links is sorted. The traffic distribution allocation of each type of traffic is continued with the updated first ratio order and the second ratio sorting until each link is unassigned, and unassigned each type of traffic is uniformly allocated to the remaining links.
7. The method of claim 6, wherein the determining, based on the obtained difference, whether to continue distributing the distributed traffic to the link comprises:

   The second ratio of the link having the smallest second ratio is subtracted from the calculated sum of the first ratios of the flow rates of each type of the link assigned to the link with the smallest second ratio, and then the difference is obtained when the difference is equal to zero. The traffic distribution of the link; when the difference is less than zero, the corresponding type of traffic when the value is less than zero is used as the unallocated traffic, and the traffic is allocated to the link.
8. The method according to any one of claims 1 to 3, wherein when the load sharing parameter is less than a preset load sharing threshold, the method further comprises:

   The first load sharing method is used for traffic distribution.
9. The method according to any one of claims 1 to 3, wherein after the switching to the second load sharing method for traffic distribution, the method further comprises:

   The traffic is distributed to the link of the traffic distribution, the corresponding ACL rule is delivered, and the traffic is distributed according to the ACL rule.

   The ACL rule is an ACL five-tuple, through a content-addressable memory TCAM or a prefix tree trie The table is issued.
10. The method of claim 9, wherein when performing traffic distribution, the method further comprises:

    When the ACL rule does not match the traffic distribution, the first load balancing is used for the traffic of the type, and the number of traffic types of the first load sharing traffic is counted. When the number of the traffic traffic types is greater than the matching adjustment threshold. And distributing the traffic of the second load by using the second load sharing method for the undistributed traffic.
11. An apparatus for implementing load sharing, comprising: a statistical analysis unit and a judgment processing unit; wherein

    The statistical analysis unit is configured to: collect statistics on each link under the first load sharing method in the first preset duration, and obtain a load sharing parameter of the system;

    The judgment processing unit includes a judgment module and a processing module; wherein

    The determining module is configured to: determine that the load sharing is uneven when the load sharing parameter is greater than or equal to a preset load sharing threshold;

    The processing module is configured to: when determining the load sharing unevenness, switch to the second load sharing method to distribute the traffic to the traffic distribution link for traffic distribution.
12. The apparatus of claim 11 wherein said statistical analysis unit is configured to:

    Counting the first preset duration within a pre-set SIP-based, or DIP-based, or UDP-based port number, or triple-based, or quintuple-based, or CRC-based, or XOR-based static mapping method Link traffic, get the load sharing parameters of the system.
13. The apparatus of claim 11 wherein said statistical analysis unit is configured to:

    Dividing the traffic of each link of the statistics by the bandwidth of each link itself to obtain a corresponding traffic bandwidth ratio of each link;

    The load sharing parameter is obtained by subtracting the minimum value of the traffic bandwidth ratio from the maximum value in the traffic bandwidth ratio.
14. The apparatus according to any one of claims 11 to 13, wherein the processing module is configured to: when determining load sharing unevenness,

    And sampling the traffic to be distributed by the load sharing in the second preset duration according to the preset ratio;

    Analyzing a type of sampling traffic and obtaining a first ratio of sampling traffic of each type of traffic, and calculating a second ratio of each link bandwidth in the link to a total bandwidth of all links distributed by the traffic;

    Traffic is distributed to each link for traffic distribution according to the size of the first ratio and the second ratio.
15. The apparatus according to any one of claims 11 to 13, wherein the processing module is configured to: when determining load sharing unevenness,

    And sampling the traffic to be distributed by the load sharing in the second preset duration according to the preset ratio;

    Analyzing a type of sampling traffic and obtaining a first ratio of sampling traffic of each type of traffic, and calculating a second ratio of each link bandwidth in the link to a total bandwidth of all links distributed by the traffic;

    After sorting each type of traffic and link according to the first ratio and the second ratio, respectively, assigning each type of traffic to the second ratio from small to large according to the order of the first ratio up to the first ratio being the smallest. In each link.
16. The apparatus according to any one of claims 11 to 13, wherein the processing module is configured to: when determining load sharing unevenness,

    And sampling the traffic to be distributed by the load sharing in the second preset duration according to the preset ratio;

    Analyzing a type of sampling traffic and obtaining a first ratio of sampling traffic of each type of traffic, and calculating a second ratio of each link bandwidth in the link to a total bandwidth of all links distributed by the traffic;

    After sorting each type of traffic and links according to the first ratio and the second ratio, respectively, each type of traffic is allocated one by one according to the first ratio, from the largest to the smallest, to the second smallest link. ;

    Calculating an accumulated sum of the first ratios of each type of traffic assigned to the link having the smallest second ratio, subtracting the second ratio of the link having the smallest second ratio from the calculated sum obtained and obtaining the difference, according to The obtained difference determines whether to continue to distribute the distributed traffic to the link;

    When the allocation of traffic to the link is stopped, the link is removed from the ordering of the distributed distribution traffic, and the size ratio of the first ratio of each type of traffic that is not allocated is updated and the second ratio of the unallocated links is sorted. , the traffic distribution distribution of each type of traffic is continued with the updated first ratio ordering and the second ratio sorting, until only one link remains, and unassigned each type of traffic is uniformly allocated to the The remaining links.
17. The apparatus according to any one of claims 11 to 13, wherein the processing module is configured to: when determining load sharing unevenness,

    And sampling the traffic to be distributed by the load sharing in the second preset duration according to the preset ratio;

    Analyzing a type of sampling traffic and obtaining a first ratio of sampling traffic of each type of traffic, and calculating a second ratio of each link bandwidth in the link to a total bandwidth of all links distributed by the traffic;

    After sorting each type of traffic and links according to the first ratio and the second ratio, respectively, each type of traffic is allocated one by one according to the first ratio, from the largest to the smallest, to the second smallest link. ;

    The second ratio of the link having the smallest second ratio is subtracted from the calculated sum of the first ratios of the flow rates of each type of the link assigned to the link with the smallest second ratio, and then the difference is obtained when the difference is equal to zero. The traffic distribution of the link; when the difference is less than zero, the corresponding type of traffic when the value is less than zero is used as the unallocated traffic, and the traffic is allocated to the link;

    When the allocation of traffic to the link is stopped, the link is removed from the ordering of the distributed distribution traffic, and the size ratio of the first ratio of each type of traffic that is not allocated is updated and the second ratio of the unallocated links is sorted. The traffic distribution allocation of each type of traffic is continued with the updated first ratio order and the second ratio sorting until each link is unassigned, and unassigned each type of traffic is uniformly allocated to the remaining links.
18. The apparatus according to any one of claims 11 to 13, wherein

    The determining module is further configured to: when the load sharing parameter is less than a preset load sharing threshold, determine that the load sharing is uniform;

    The processing module is further configured to: when determining load sharing is uniform, use the first load sharing method to perform traffic distribution.
19. The device according to any one of claims 11 to 13, further comprising a rule issuing unit, configured to: after switching to the second load sharing method for traffic distribution, assigning a corresponding ACL according to the traffic distribution to the link for traffic distribution Rules, traffic distribution based on ACL rules;

    The ACL rule is an ACL quintuple, which is delivered through a content-addressable memory TCAM or a prefix tree trie table.
20. The apparatus according to claim 19, further comprising a statistical processing unit configured to: when performing traffic distribution,

    When the ACL rule does not match the traffic distribution, the first load balancing is used for the traffic of the type, and the number of traffic types of the first load sharing traffic is counted. When the number of the traffic traffic types is greater than the matching adjustment threshold. And distributing the traffic of the second load by using the second load sharing method for the undistributed traffic.
21. A computer readable storage medium storing computer executable instructions for performing the method of any of claims 1-10.

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