CN101710905A - Address resolution control method and system based on tactics - Google Patents
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Abstract
The invention relates to an address resolution control method and a system based on tactics. The address resolution control method based on the tactics comprises the following steps: 1. after a user starts a domain name resolution request, a domain name server transmits the request to an address resolution judgement device; 2. the address resolution judgement device judges the optimum IP address according to a preset resolution items or the combination of the resolution items and collected information relative to the preset resolution items; 3. the address resolution judgement device sends the optimum IP address to a domain name server; and 4. the domain name server sends the optimum IP address to the user. The invention can improve user experience and network load and reasonably set flow between the user and the server to avoid the phenomenon that part of the links jam.
Description
Technical field
The present invention relates to the address resolution field, relate in particular to a kind of address resolution control method and system based on strategy.
Background technology
As shown in Figure 1, the user who has been connected to network will experience following steps when the accesses network resource:
Because the continuous increase of number of users and the multimedization of accessed content, the disposal ability of a server can't satisfy the requirements for access of all users in the network, the reliability of the separate unit server requirement that can not satisfy for a long time, uninterruptedly serve in addition.Therefore the multiple servers group of the mutual backup of the same area has appearred being positioned at, and the server farm that is positioned at the network diverse location.A large amount of servers can be shared user's requirements for access jointly, and have improved reliability of service.
But a plurality of server farm need a plurality of IP address, therefore in DNS same domain name with a plurality of IP of correspondence address.How dns server provides an IP address to the user if need being judged.
As shown in Figure 2, for the load balancing between the multiple servers of realizing same domain name correspondence, the DNS load equalizer has appearred.This equipment can to the different IP address of user feedback, thereby evenly spread to user capture on many different servers according to the different conditions of server.
Existing load balancing scheme has following defective:
1) poll and random fashion only arrive different server with user's mean allocation, yet the visit behavior of different user and accessed content are all inequality, therefore still may cause the different server load difference bigger.
2) distribute according to server state, though consider the fault and the loading condition of server, but only carry out load allocating and mainly be applicable to the multiple servers that is positioned at same geographical position according to server state, do not consider multiple factors such as server location, server access link bandwidth, therefore can't improve user experience and offered load.
Summary of the invention
In order to solve above-mentioned technical problem, a kind of address resolution control method and system based on strategy is provided, its purpose is, rationally arranges the flow between user and the server to avoid causing part of links congested.
The invention provides a kind of address resolution control method, comprising based on strategy:
Step 1, after the user initiated the domain name mapping request, name server was forwarded to the address resolution judgment device with this request;
Step 2, the address resolution judgment device is judged best IP address according to the strategy entries that presets or the combination and the information relevant with strategy entries that preset collection of strategy entries;
Step 3, the address resolution judgment device is sent to name server with best IP address;
Step 4, name server sends this best IP address to the user.
In the step 2, information acquisition module is collected the information relevant with the strategy entries that presets and is sent to the address resolution judgment device.
In the step 2, strategy entries is preset in the address resolution judgment device.
In the step 2, analysis module also carries out merger and arrangement to the relevant information of the strategy entries with presetting that information acquisition module is collected according to form, sends to the address resolution judgment device then, so that inquiry of address resolution judgment device and use.
The relevant packets of information includes network routing table of strategy entries with presetting of collecting, network equipment state information, network link bandwidth utilization rate, server ip address, server state information, IP address and corresponding User Priority.
The information that analysis module sends to the address resolution judgment device comprises: routing table, the whole network network equipment and state information list, the tabulation of the whole network network link information, server domain name and state information, IP address list and IP address and corresponding priorities tabulation.
Strategy entries comprises: carry out equilibrium according to server load, carry out equilibrium and carry out equilibrium according to User Priority according to network link loads.
The address resolution judgment device is according to the best IP of the lightest judgement of the load address of server and user's nearest and/or server.
The invention provides a kind of address resolution control system, comprise terminal and name server, also comprise the address resolution judgment device based on strategy;
Terminal is used for initiating the domain name mapping request for the user;
Name server is used for this request is forwarded to the address resolution judgment device; The best IP address that receives is sent to terminal;
The address resolution judgment device is used for judging best IP address according to the strategy entries that presets or the combination and the information relevant with strategy entries that preset collection of strategy entries, and best IP address is sent to name server.
Also comprise information acquisition module, be used to collect the information relevant and be sent to the address resolution judgment device with the strategy entries that presets.
Strategy entries is preset in the address resolution judgment device.
Also comprise analysis module, be used for the relevant information of the strategy entries with presetting that information acquisition module is collected is carried out merger and arrangement according to form, send to the address resolution judgment device then, so that inquiry of address resolution judgment device and use.
The relevant packets of information includes network routing table of strategy entries with presetting of collecting, network equipment state information, network link bandwidth utilization rate, server ip address, server state information, IP address and corresponding User Priority.
The information that analysis module sends to the address resolution judgment device comprises: routing table, the whole network network equipment and state information list, the tabulation of the whole network network link information, server domain name and state information, IP address list and IP address and corresponding priorities tabulation.
Strategy entries comprises: carry out equilibrium according to server load, carry out equilibrium and carry out equilibrium according to User Priority according to network link loads.
The address resolution judgment device is according to the best IP of the lightest judgement of the load address of server and user's nearest and/or server.
The present invention can improve user experience and offered load, rationally arranges the flow between user and the server to avoid causing part of links congested.
Description of drawings
Fig. 1 is the process that the user passes through the domain name access Internet resources in the prior art;
Fig. 2 is a load sharing condition under the multiserver scene in the prior art;
Fig. 3 address resolution control system and control flow based on strategy provided by the invention;
Fig. 4 information gathering flow process provided by the invention;
Fig. 5 analysis process provided by the invention;
Fig. 6 judgement flow process provided by the invention;
Fig. 7 workflow provided by the invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Prior art mainly is conceived to the load balancing of server side, does not still possess and network side load balancing and user distinguish function.In the present circumstance, flux and flow direction and problem of load balancing have become the focus of research in the network.For example in the Internet, because the ISIS or the ospf protocol that adopt all adopt " SPF " algorithm, therefore the path from the source end to destination is fixed in the network, if can not rationally arrange the flow between user and the server must cause part of links congested.
Because the user is when the accesses network resource, the first step at first needs to adopt DNS system searching IP address, therefore the present invention is mainly by controlling the dns server analysis result, change the destination address of user capture, realize the control of service route in the network, realize load balancing to a certain extent.In addition the present invention can take the combination of a kind of strategy or multiple strategy realize network flow to control.
The present invention is by multiple information such as server state information, network routing iinformation, the network equipment and link information, user profile in the collection network, comprehensively judge the best server that the user should visit according to network state, server state and User Status, and judged result sent to the DNS system, make the server ip address of user capture the best.
As shown in Figure 3, the main device that the present invention relates to comprises information collecting device, analytical equipment, address resolution judgment device.Said apparatus can be positioned at the optional position in present networks (autonomous territory), and for example said apparatus can be positioned at the outlet in network management center, each province of backbone network, large-scale IDC outlet or the like.Said apparatus and can be adopted any communication technology in this area to communicate between the device of image data for example adopts IP network, Ethernet, physical link or other communication technologys.
Wherein information collecting device is meant the method by hardware or software, be deployed in a plurality of positions in the network, collect operation condition of server, network equipment running status, network link status, user profile or the like, and will send analytical equipment after the above-mentioned information processing to.The specific implementation method can be:
A, to the information gathering of server: can obtain the main resource operating position of server by the server OS interface; Perhaps software or the hardware interface by server management system obtains above-mentioned relevant information.The information that obtains can comprise: whether server is working properly, occupancy of resources such as internal memory, CPU, hard disk, network interface or the like.
B, to the information gathering of network state: network state information comprises network routing iinformation, the network equipment and link information, can be by direct accesses network equipment itself, as by the direct access router of Telnet mode, switch; Perhaps by soft, hardware network management interface accesses network equipment itself, as passing through the direct access router of snmp protocol; Perhaps,, obtain the network information indirectly as by SNMP or other northbound interfaces visit network management system server by the network management system dereference network equipment; Perhaps, obtain the network equipment or link information indirectly as systems such as flux and flow direction analytical system, DPI, DFI by other auxiliary equipment.The information that obtains can comprise: whether the network equipment is working properly, internal memory, CPU usage, routing table, port speed and link utilization or the like.
C, to the information gathering of User Status: can judge customer location by user's IP address, and obtain user related informations by user's related network elements such as BRAS equipment, radius server, HLR.The information that obtains can comprise: the access bandwidth of user gradation, authority, user applies, customer location or the like.
Wherein analytical equipment mainly refers to the method by hardware or software, the information that information collecting device is collected is put in order, concludes, is compressed, and result is fed back to the address resolution judgment device.Analytical equipment can be one or more, is used for handling a certain class or multiclass information respectively.Arrangement: recognition data form and validity, invalid data is removed; Conclude: data are sorted out according to classifications such as address area, time, importance; Compression:, reduce transmitted data amount with the compression of The data special algorithm.
Wherein address resolution judgment device mainly is meant the method by hardware or software, and the information that analytical equipment provides is judged.The strategy that the address resolution judgment device also is provided with as receiving management person simultaneously in advance, as some integrated conditions that is provided with according to server state, network state, user profile specific targets, select a best server address that is fit to this user capture, and this judged result is sent to dns server.
Can connect by communication network between the said apparatus, also can directly interconnect or adopt the dedicated network mode to connect.Hu Tongxin mode can adopt ripe variety of way mutually.
Main flow process of the present invention
As shown in Figure 3, the address resolution control flow based on strategy provided by the invention comprises:
Step 31, the information gathering flow process obtains various state informations by information collecting device from relevant device;
Step 32, analysis process, harvester gathers the various information of acquisition to analytical equipment, and analytical equipment carries out simple process to information;
Step 33, for judging flow process, according to the result of analysis and arrangement, and the strategy of setting in advance, the address resolution judgment device sends judged result to DNS.
The information gathering flow process comprises as shown in Figure 4:
Wherein step 42 is meant that the various finish messages that will collect are the information (so-called form mainly is meant and meets intermodule interface specification data form) that meets certain format), perhaps compress, operation such as merger.
The information of gathering can include but not limited to following content: network routing table; Network equipment state information is as CPU, memory usage; Network link bandwidth utilization rate; Server ip address; Server state information is as CPU, memory usage; Information such as IP address, priority.Information gathering can be upgraded with certain frequency, perhaps adopts other external mechanism to trigger and upgrades.
The analysis process The main analysis content is that above-mentioned information is sorted, sets up incidence relation, and sorts according to certain index entry according to the strategy entries that sets in advance.As shown in Figure 5, comprising:
Wherein step 52 is meant and will carries out the merger arrangement from the information of a plurality of information collecting devices acquisitions or the information that obtains from other analytical equipment, become (so-called form mainly is meant and meets intermodule interface specification data form) that meet certain format, be convenient to the data of inquiring about and using.
The information that sends to the address resolution judgment device includes but not limited to following content: routing table; The whole network network equipment (all node devices in this autonomous territory) and state information list; The whole network network link (all links in this autonomous territory) information list; Server domain name and state information, IP address list; IP address and corresponding priorities tabulation;
Judge flow process as shown in Figure 6, comprising:
Wherein step 61 is by the predefined as required strategy entries of system manager or according to the combination of the strategy entries of certain prioritization.Strategy entries can including but not limited to: carry out equilibrium according to server load; Carry out equilibrium according to network link loads; Carry out equilibrium according to User Priority.Wherein step 62 is closely related with tactful predefine, carries out best IP address choice according to the order of strategy entries.For example, when only the definition strategy clauses and subclauses are for " carrying out equilibrium according to network link loads ", device will be according to a plurality of IP of User IP, server, and routing table is calculated the user to the path between each server, according to the loading condition that comprises each section link in the path, select the lightest path of link load, then this path corresponding server IP address is sent to dns server, as the best IP address of selecting; When only the definition strategy clauses and subclauses are for " carrying out equilibrium according to User Priority ", device will be determined to judge according to IP address and corresponding priorities, if be domestic consumer, then determine the IP address with polling mode, if be high-priority users, then chosen distance user's nearest (jumping figure or physical distance) server ip is as best IP address.
Workflow during certain domain name of user capture provided by the invention comprises as shown in Figure 7:
A. embodiment 1
Certain user 1 is by certain domain name of access to netwoks, as www.yyy.cn.This domain name corresponding server has server 1, server 2 ... server N, and be distributed in the diverse location of network.Meanwhile user 2, user 3 ... user M also requires to visit this domain name.
Suppose that the strategy entries in the address resolution judgment device is set in order:
User gradation is preferential;
Server load is preferential;
Offered load is preferential;
After high-priority users 1 was sent the dns resolution request, dns server sent to the address resolution judgment device with User IP and domain name.The address resolution judgment device receives after the domain name " www.yyy.cn " and IP address of DNS forwarding, at first searches corresponding priorities according to User IP.If user 1 is a high-priority users, then address judgement server according to User IP, routing table, server ip (N altogether) at first calculate shortest path by, this shortest path also can be the shortest according to actual transmissions path distance by being the jumping figure minimum, determined in advance by tactful predefine.If exist a plurality of shortest paths by, then further carry out server priority and judge.By the corresponding server, select the minimum server (according to server state information, as CPU, memory usage) of load from a plurality of shortest paths.If in server, still there is the minimum server of a plurality of loads, then judge according to Internet resources situation (according to network equipment state information, as CPU, memory usage, network link bandwidth utilization rate).Select the lightest route path corresponding server IP address of link section load as optimum IP address.Address resolution judgment device then feeds back to dns server with this IP address, and returns to the user by dns server.
If domestic consumer 2 sends same DNS request, after then judgement server in address is judged through user priority, directly skip the user priority strategy, select wherein load the lightest according to server load.In the lightest server of a plurality of loads, calculate many related paths, and, therefrom select the lightest path of load then according to every link, node load information that path is related according to User IP, server ip, routing table.This path corresponding server IP address is fed back to dns server as optimum address, and return to the user by dns server.
B. embodiment 2
Certain user 1 is by certain domain name of access to netwoks, as www.zzz.cn.This domain name corresponding server has server 1, server 2 ... server N, and be distributed in the diverse location of network.Meanwhile user 2, user 3 ... user M also requires to visit this domain name.
Suppose that the strategy entries in the address resolution judgment device is set in order:
Server load is preferential;
Offered load is preferential;
User gradation is preferential;
After user 1 sent the dns resolution request, dns server sent to the address resolution judgment device with User IP and domain name.The address resolution judgment device receives after the domain name " www.zzz.cn " and IP address of DNS forwarding, at first judge, select the lower server of load according to server state information (major parameter includes but not limited to processor load in the server, memory device operating position, server operating state (as whether there being fault)).In above-mentioned server, select the path of offered load minimum (major parameter includes but not limited to key parameters such as link utilization, network element processing resources occupation rate, hop count, transmission range, and above-mentioned parameter is described in detail) then in the preamble collecting device.Judge according to User Priority at last,, then select the shortest path corresponding server in path if be high-priority users; If be domestic consumer, poll in above-mentioned server then.
Among the present invention, can before the user sends the DNS request, be ready to, also can trigger and carry out subsequent processing steps by user's DNS request about the collection of routing state information, server state information, user profile, analysis, arrangement.Shift to an earlier date ready advantage and be that DNS adjudicates and response speed is fast, but need to consume bigger storage, processing resource; The advantage that is triggered by user behavior is to save storage, handles resource, but response speed is slow.Also can be that partial information is ready in advance, other information be triggered by request.
Among the present invention, can adopt several different methods, for example the average link utilance of all link sections of whole piece path, the perhaps the heaviest link section of load in the whole piece path about the judgement of offered load.Can adopt several different methods such as jumping figure minimum, physical distance be the shortest about the judgement of Internet resources.
Those skilled in the art can also carry out various modifications to above content under the condition that does not break away from the definite the spirit and scope of the present invention of claims.Therefore scope of the present invention is not limited in above explanation, but determine by the scope of claims.
Claims (16)
1. the address resolution control method based on strategy is characterized in that, comprising:
Step 1, after the user initiated the domain name mapping request, name server was forwarded to the address resolution judgment device with this request;
Step 2, the address resolution judgment device is judged best IP address according to the strategy entries that presets or the combination and the information relevant with strategy entries that preset collection of strategy entries;
Step 3, the address resolution judgment device is sent to name server with best IP address;
Step 4, name server sends this best IP address to the user.
2. the address resolution control method based on strategy as claimed in claim 1 is characterized in that, in the step 2, information acquisition module is collected the information relevant with the strategy entries that presets and is sent to the address resolution judgment device.
3. the address resolution control method based on strategy as claimed in claim 1 is characterized in that, in the step 2, strategy entries is preset in the address resolution judgment device.
4. the address resolution control method based on strategy as claimed in claim 2, it is characterized in that, in the step 2, analysis module also carries out merger and arrangement to the relevant information of the strategy entries with presetting that information acquisition module is collected according to form, send to the address resolution judgment device then, so that inquiry of address resolution judgment device and use.
5. the address resolution control method based on strategy as claimed in claim 4, it is characterized in that, the relevant packets of information includes network routing table of strategy entries with presetting of collecting, network equipment state information, network link bandwidth utilization rate, server ip address, server state information, IP address and corresponding User Priority.
6. the address resolution control method based on strategy as claimed in claim 5, it is characterized in that, the information that analysis module sends to the address resolution judgment device comprises: routing table, the whole network network equipment and state information list, the tabulation of the whole network network link information, server domain name and state information, IP address list and IP address and corresponding priorities tabulation.
7. the address resolution control method based on strategy as claimed in claim 1 is characterized in that strategy entries comprises: carry out equilibrium according to server load, carry out equilibrium and carry out equilibrium according to User Priority according to network link loads.
8. the address resolution control method based on strategy as claimed in claim 1 is characterized in that, the address resolution judgment device is according to the best IP of the lightest judgement of the load address of server and user's nearest and/or server.
9. the address resolution control system based on strategy comprises terminal and name server, it is characterized in that, also comprises the address resolution judgment device;
Terminal is used for initiating the domain name mapping request for the user;
Name server is used for this request is forwarded to the address resolution judgment device; The best IP address that receives is sent to terminal;
The address resolution judgment device is used for judging best IP address according to the strategy entries that presets or the combination and the information relevant with strategy entries that preset collection of strategy entries, and best IP address is sent to name server.
10. the address resolution control system based on strategy as claimed in claim 9 is characterized in that, also comprises information acquisition module, is used to collect the information relevant with the strategy entries that presets and is sent to the address resolution judgment device.
11. the address resolution control system based on strategy as claimed in claim 9 is characterized in that strategy entries is preset in the address resolution judgment device.
12. the address resolution control system based on strategy as claimed in claim 10, it is characterized in that, also comprise analysis module, be used for the relevant information of the strategy entries with presetting that information acquisition module is collected is carried out merger and arrangement according to form, send to the address resolution judgment device then, so that inquiry of address resolution judgment device and use.
13. the address resolution control system based on strategy as claimed in claim 12, it is characterized in that, the relevant packets of information includes network routing table of strategy entries with presetting of collecting, network equipment state information, network link bandwidth utilization rate, server ip address, server state information, IP address and corresponding User Priority.
14. the address resolution control system based on strategy as claimed in claim 13, it is characterized in that, the information that analysis module sends to the address resolution judgment device comprises: routing table, the whole network network equipment and state information list, the tabulation of the whole network network link information, server domain name and state information, IP address list and IP address and corresponding priorities tabulation.
15. the address resolution control system based on strategy as claimed in claim 9 is characterized in that strategy entries comprises: carry out equilibrium according to server load, carry out equilibrium and carry out equilibrium according to User Priority according to network link loads.
16. the address resolution control system based on strategy as claimed in claim 9 is characterized in that, the address resolution judgment device is according to the best IP of the lightest judgement of the load address of server and user's nearest and/or server.
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