CN103685054B - Multipath load balancing method based on service awareness - Google Patents
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Abstract
The invention provides a multipath load balancing method based on service awareness. The method is used for balancing loads according to path weight and aware service traffic. The load balancing method includes the following steps that a network topology structure is determined; routing information and bandwidth information of the network topology structure are collected; according to the collected routing information, multiple paths of all routes are calculated; according to the collected bandwidth information, all link bandwidth information and available bandwidth information of all the paths are acquired so as to calculate weight of all the paths; the calculated multiple paths and the corresponding path weight are configured; load balance is achieved by the aware service through the configured multiple paths and the corresponding weight. The multipath load balancing method based on service awareness follows up the bandwidth of links so that the multiple paths and the corresponding path weight can be calculated, frequent updating of the routes is avoided, when the loads are balanced, bandwidth allocation is performed according to the weight of all the paths, meanwhile traffic is in awareness, and therefore load balancing is performed according to the aware traffic and the weight of the multiple paths.
Description
Technical field
The present invention relates to computer network field is and in particular to a kind of load balance side based on service-aware
Method.
Background technology
At present, the user on the Internet and congestion all in rapid growth, network for the application become one highly important
Problem, the congestion in network derives from Internet resources and the distribution of network traffics and the lack of uniformity of distribution, thus, flow load
The meaning of balance just seems especially prominent.Interior Gateway Protocol realizes load balancing target, adjustment setting net by routing optimality
In network, the weights of each link are controlled to network route, reach load balancing target.
However, due to not utilizing flow distribution information in network, Internet resources therefore can not be effectively utilized, will simultaneously
Link metric is corresponding with the load condition on current ink to bring frequently route changing, lead to unstable networks.
Content of the invention
In view of this, present invention offer is a kind of is avoided that the multipath load based on service-aware of route frequent updating is equal
Weighing apparatus method.
A kind of load balance method based on service-aware, it is used for according to path weight value and perception service flow
To realize load balancing, described comprised the following steps based on the load balance method of service-aware:
Determine network topology structure；
The routing iinformation of collection network topological structure and bandwidth information；
Calculate the shortest path of each purpose route and be recorded as first shortest path；
Calculate the shortest path of each purpose route after deleting first shortest path and record in remaining network topology
For Article 2 shortest path；
Calculate shortest path successively to record the mulitpath of each purpose route；
Each link bandwidth information according to the bandwidth information every paths of acquisition collected and available bandwidth information are each to calculate
Path weight value；
Mulitpath and respective path weight that configuration calculates；
Perception service simultaneously realizes load balance according to the multipath configuring and respective weights.
Compared with prior art, in the load balance method based on service-aware that the present invention provides, with forward (FWD)
Wide information calculates mulitpath and respective paths weight, thus avoiding the frequent updating routeing, in load balancing, according to each road
The weight in footpath carries out bandwidth allocation, flow is perceived to realize load all according to perceived flux and multipath weight simultaneously
Weighing apparatus, it is to avoid network congestion.
Brief description
Fig. 1 is a kind of flow chart of load balance method based on service-aware that the present invention provides.
Fig. 2 is the core network example topology figure determining in Fig. 1.
Fig. 3 is that the multipath of Fig. 2 calculates shunt method schematic diagram.
Following specific embodiment will further illustrate the present invention in conjunction with above-mentioned accompanying drawing.
Specific embodiment
Refer to Fig. 1, a kind of its load balance side based on service-aware providing for embodiment of the present invention
Method, it is used for according to path weight value and perception service flow to realize load balancing, and the described multipath based on service-aware is born
Carry equalization methods to comprise the following steps:
S100: determine network topology structure；
S200: the routing iinformation in collection network topological structure and bandwidth information；
S300: calculate the mulitpath of each route according to the routing iinformation collected；
S400: according to the bandwidth information collected obtain each link bandwidth information of every paths and available bandwidth information by terms of
Calculate each path weight value；
S500: mulitpath and respective path weight that configuration calculates；
S600: perception service simultaneously realizes load balance according to the multipath configuring and respective weights.
In step s100, as shown in Fig. 2 the network topological diagram for random generation.
In step s 200, router passes through to collect the flat of locally each link bandwidth information and this link nearest a period of time
All remaining bandwidths, as available bandwidth, in present embodiment, collect the average residual bandwidth in 10 minutes.Router passes through in domain
Routing Protocol (as ospf, isis etc.) is collected to routing iinformation and updates.By collecting, depositing the route letter of adjacent node
Breath, and issue node link bandwidth and available bandwidth information, periodically interactive by intra-area routes agreement, router can obtain
Routing iinformation in whole topological structure and bandwidth information.
In step s300, need to find connectionless Multi-path route figure in network topology in figure, this routing diagram is one
Individual connectionless oriented acyclic connected graph, if not keeping connectionless, it is possible that the transfer of congestion point.If as shown in figure 3, adopting
Although the congestion of link (1,2) can be eliminated with the shunting of path shown in dotted line in Fig. 3 (a), because path shown in dotted line is converged again
Gather in node 2 so that the load of node 1 arrives more quickly at node 2, if link (2,3) does not have enough capacity, will become
New congestion point.And in Fig. 3 (b), shunt paths (shown in dotted line) do not converge at node 2, all of path is all no
Connect, congestion will not shift to link (2,3).
Router, when carrying out multipath calculating, according to the routing iinformation collected, is calculated by shortest path first
The shortest path of one purpose route, using this shortest path as in the multipath routeing to this purpose, Ran Houji
Calculate this route other paths, namely in collection network topological structure each node information, between arbitrary node
Link, according to the shortest path between link bandwidth value calculate node as the first paths, its routing metric highest.Calculating process
As follows: to delete first previously as the link in the first paths, then in remaining topology, calculate the shortest of this route
Path, and by this path the most second paths, the rest may be inferred, until calculating all paths of this purpose route.To all
Other purposes route, the routing iinformation collected according to router, carry out calculating corresponding multipath according to above method.And record
The mulitpath of all purposes route.It is understood that node in network topology structure between generally there are a plurality of road
Footpath.For the node pair of only one paths, then do not need to carry out load balancing.
In step s400, because on each path, all link bandwidth information collect acquisition by routing iinformation, pass through
The minima of the minima of each link bandwidth and available bandwidth on every paths relatively can be obtained, by link each on every paths
Minima with alleviating distention in middle-JIAO as this path bandwidth value, on every paths the minima of each link available bandwidth as this link can
Use bandwidth value.Each path weight value computing formula of every route is as follows:
Path weight value=shortest path weight+link bandwidth weight+link available bandwidth weight；
Wherein: set first shortest path weight as w1, then Article 2 shortest path is λ1w1, remaining each shortest path
For λ2w1, 0 < λ2<λ1< 1, in present embodiment, λ1For 0.8, λ2For 0.5.It is understood that the value of above each parameter is according to real
Border needs to set.
Due to differing larger in real network link bandwidth, therefore, in the present embodiment, link bandwidth weight is divided
For four grades, set upper limit link bandwidth value b1, conventional link bandwidth value is b2, lower limit link bandwidth value is b3, current ink
Carry a width of b, if b > b1When, then link bandwidth weight takes maximum w2If, b2<b<b1When, then link bandwidth weight is ρ2w2If, b3
<b<b2When, then link bandwidth weight is ρ3w2, wherein, 0 < ρ3<ρ2<ρ1<1.In present embodiment, each parameter of corresponding Ethernet
Value is as follows: b1For 10gbps (giga bits per second), b2For 1gbps, b3For 100mbps (MBPS), ρ1For 0.8, ρ2
For 0.65, ρ3For 0.5.It is understood that corresponding heterogeneous networks, according to network condition, each parameter above is accordingly set
Put.
Available bandwidth deducts using bandwidth for link bandwidth, sets the weight in the maximum path of available bandwidth in each path
For w3, each path minimum available bandwidth value is a, and the bandwidth value in the maximum path of available bandwidth is b, then remove available bandwidth maximum
The available bandwidth weight in remaining path outside path is: w3×(a/b).
In each path weight value calculates above, the ratio of each weighted value can carry out configuration modification as needed, meets higher
The corresponding weight of bandwidth is larger, is typically based on network condition, and the link using is divided, and according to all kinds of link need
Data traffic size to be carried arranges corresponding weighted value.
In step s500, the multipath of calculating is issued to router forwarding hardware (network processing unit or multinuclear cpu
Chip) in.In setting, in addition to exit port, also needing to comprise the corresponding routing weights in this port, link bandwidth weight and link can
Use bandwidth weighting.If multipath is not changed in, when only link available bandwidth weight changes, then only need to change this link
Available bandwidth weight.
In step s600, when network service traffic perceives.Router passes through accesses control list (access
Control list, acl) function is to the source/destination ip address comprising in incoming data packet header information, source/destination port
With protocol type etc., carry out the perception of data traffic, pass through acl simultaneously and hardware counts and combines, realize convection current through router
Various types of data bandwidth occupied by service measure to realize load balancing and outside notice available link bandwidth information, and
Recorded according to the feature of this flow.
Being perceived according to network traffics, if having the exit port of same traffic in record, checking whether this exit port bandwidth exceedes
The upper limit of heavy duty, if be less than, forwards from this port.If not this business in record, according to loading condition and Ge Lu
The allocated bandwidth situation in footpath, ensures that business forwarding rate has been distributed in each path consistent with the ratio of its weight as far as possible.Concrete choosing
Select principle as follows:
(1) service bandwidth between path is less than the ratio lower limit k of mulitpath bandwidth summinWhen for underloading when, as
During underloading, it should utilize the big link of shortest path weight, to equalize net as far as possible in the case that exchange pressure is less in a network
Network loads.In present embodiment, Set scale lower limit is 20% it is to be understood that ratio lower limit can set according to being actually needed
Put.
(2) service bandwidth between path is more than ratio upper limit k of mulitpath bandwidth summaxWhen for heavy duty when, select
The big link of available bandwidth weight as distribution bandwidth path, is effectively reduced queuing on link, transmission delay so that network
There is good dynamic response, be conducive to saving Internet resources.In present embodiment, the Set scale upper limit be 60% it is possible to understand that
, the ratio upper limit can be according to being actually needed setting.
(3), when between underloading and heavy duty, according to each path a period of time allocated average bandwidth recently, calculate and divide
Wear the wide ratio with link bandwidth weight and select the minimum path of ratio as the path of distribution bandwidth, to ensure each as far as possible
Pro rate between path.In present embodiment, setting nearest a period of time is for 10 minutes it is to be understood that the time can
Foundation is actually needed setting.
During carrying out load balancing, First Principles are to try to ensure identical services from same path transmission, if one
Path cannot meet the fractionation that during business transmission, business is carried out with different paths.In present embodiment, the alarming threshold of road bandwidth
It is set to the 80% of link bandwidth ability it is ensured that bandwidth threshold is set to the 20% of link bandwidth ability.
If the distribution bandwidth of paths reaches the alarming threshold value of this link bandwidth, according to according to load balancing again
Select the paths in multipath to be forwarded, namely be less than the guarantor of setting if there is other a certain paths distribution bandwidths
During card bandwidth threshold, need the business in this path is split, remove the record in this path first, make to need by this path
The paths that reselected according to load balancing in multipath of data service forwarded, make the business in this path again according to
According to the principle distribution path of load balancing, thus breaking a business from same path transmission rule.
If the distribution bandwidth of single business reaches the alarming threshold of this link bandwidth, split business and select else and take multichannel
In footpath, the minimum link transmission of distribution bandwidth is so that described single business presence two paths are transmitted.If still depositing after splitting
When bandwidth on single-link for the single business exceedes the alarming threshold of link bandwidth, then split further up to all chains
Road distribution bandwidth all less than alarming threshold, to ensure the load balancing in each path.
The present invention provide the load balance method based on service-aware in, calculate a plurality of disjoint path and
Respective paths weight, when carrying out path computing, is calculated according to link bandwidth ability, is not considered load state, it is to avoid route
Frequent updating, in load balancing, the dynamic equalization being loaded according to the weight in each path distributes, and flow is carried out simultaneously
Perception, and the forwarding service of perception is recorded, the identical services amount of flowing to end is assigned on same paths, high to priority
Business uses the high path of path weight value, the relatively low business of priority then using the path of sub-optimal path weight, thus when ensureing
The concordance prolonged and shake.
It is understood that for the person of ordinary skill of the art, can be done with technology according to the present invention design
Go out other various corresponding change and deformation, and all these change all should belong to the protection model of the claims in the present invention with deformation
Enclose.
Claims (8)
1. a kind of load balance method based on service-aware, its be used for according to path weight value and perception service flow with
Realize load balancing, described comprised the following steps based on the load balance method of service-aware:
Determine network topology structure；
The routing iinformation of collection network topological structure and bandwidth information；
Calculate the shortest path of each purpose route and be recorded as first shortest path；
Calculate the shortest path of each purpose route after deleting first article of shortest path and be recorded as the in remaining network topology
Article two, shortest path；
Calculate shortest path successively to record the mulitpath of each purpose route；
Each link bandwidth information according to the bandwidth information every paths of acquisition collected and available bandwidth information are to calculate each path
Weight；
Mulitpath and respective path weight that configuration calculates；
Perception service simultaneously realizes load balance according to the multipath configuring and respective weights.
2. the load balance method based on service-aware as claimed in claim 1 is it is characterised in that weigh in each path
In the step of re-computation: each path weight value computing formula of every route is:
Path weight value=shortest path weight+link bandwidth weight+link available bandwidth weight；
Wherein: set first shortest path weight as w1, Article 2 shortest path is λ1w1, remaining each shortest path is λ2w1, 0
<λ2<λ1<1.
3. the load balance method based on service-aware as claimed in claim 2 is it is characterised in that λ1For 0.8, λ2
For 0.5.
4. the load balance method based on service-aware as claimed in claim 2 is it is characterised in that weigh in each path
In re-computation formula, set upper limit link bandwidth value b1, conventional link bandwidth value is b2, lower limit link bandwidth value is b3, current chain
The a width of b of road band, if b > b1When, then link bandwidth weight takes maximum w2If, b2<b<b1When, then link bandwidth weight is ρ2w2If,
b3<b<b2When, then link bandwidth weight is ρ3w2, wherein, 0 < ρ3<ρ2<ρ1< 1, b1For 10gbps, b2For 1gbps, b3For
100mbps, ρ1For 0.8, ρ2For 0.65, ρ3For 0.5.
5. the load balance method based on service-aware as claimed in claim 2 is it is characterised in that weigh in each path
In re-computation formula, set the weight in the maximum path of available bandwidth in each path as w3, each path minimum available bandwidth value is
A, the bandwidth value in the maximum path of available bandwidth is b, then the available bandwidth in remaining path in addition to the maximum path of available bandwidth
Weight is: w3×(a/b).
6. the load balance method based on service-aware as claimed in claim 1 is it is characterised in that realizing load
In equilibrium step:
Service bandwidth between path is less than when being underloading during the ratio lower limit of mulitpath bandwidth sum, selects shortest path power
Great link is as distribution bandwidth path；When service bandwidth between path is more than the ratio upper limit of mulitpath bandwidth sum
For during heavy duty, selecting the big link of available bandwidth weight as distribution bandwidth path；
When between underloading and heavy duty, according to the ratio of the allocated bandwidth calculation in each path distribution bandwidth and link bandwidth weight
And select the minimum path of ratio as the path of distribution bandwidth.
7. the load balance method based on service-aware as claimed in claim 1 is it is characterised in that in perception service
And realize in load balancing steps:
Perception service flow simultaneously records each flow forward-path；
To carry out turning according to the forward-path of record with the service traffics identical business above perceiving in the follow-up flow entering
Send out.
8. the load balance method based on service-aware as claimed in claim 7 is it is characterised in that record in foundation
Forward-path forward step in:
If the distribution bandwidth of paths reaches the alarming threshold value of this link bandwidth, foundation reselects according to load balancing
Paths in multipath are forwarded；
If the distribution bandwidth of single business reaches the alarming threshold of this link bandwidth, split business selecting else and take in multipath
The minimum link transmission of distribution bandwidth is so that described single business presence two paths are transmitted；
If bandwidth on single-link for the single business exceedes the alarming threshold of link bandwidth after splitting, split further
Until the bandwidth of all link distribution is all less than alarming threshold.
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