CN101197811A - Method for improving server reliability in dynamic main unit configuration protocol under proxy mode - Google Patents
Method for improving server reliability in dynamic main unit configuration protocol under proxy mode Download PDFInfo
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- CN101197811A CN101197811A CNA2006101443695A CN200610144369A CN101197811A CN 101197811 A CN101197811 A CN 101197811A CN A2006101443695 A CNA2006101443695 A CN A2006101443695A CN 200610144369 A CN200610144369 A CN 200610144369A CN 101197811 A CN101197811 A CN 101197811A
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Abstract
The invention discloses a method for improving the reliability of the server in a dynamic host configuration protocol in an agent mode, which is used in a system comprising a DHCP customer end, a DHCP server and a DHCP relay unit, and comprises that: the first step, n DHCP servers are configured on the DHCP relay unit, a task is created, connection state of the DHCP relay unit and n DHCP servers are maintained periodically, n is a natural number more than or equal to 2; the second step, the DHCP relay unit receives and processes an address request sent by the DHCP customer end as well as selects one DHCP server among n DHCP servers; the third step, a protocol session process is executed among the DHCP customer end, the DHCP relay unit and the selected DHCP server. The adoption of the method of the invention overcomes the influence on the whole system caused by the failure of a single DHCP server, and improves the reliability of an address server.
Description
Technical field
The present invention relates to a kind of method that under agent way, disposes a plurality of address servers, particularly relate to a kind of method that improves server reliability in the dynamic main unit configuration protocol under proxy mode.
Background technology
At dynamic host configuration protocol DHCP (Dynamic Host Configuration Protocol, DHCP) in, the major function of DHCP Relay (relaying) is the transparent interaction of realizing between DHCP Client (client) and the DHCP Server (server), finishes dynamic assignment and management to DHCP Client end address.
DHCP Relay need catch and handle the DHCP protocol data bag of DHCP Client and DHCP Server both sides.For DHCP Client, DHCP Relay is equivalent to DHCP Server; For DHCPServer, DHCP Relay is equivalent to DHCP Client.
Stipulate according to agreement, under the situation that does not have the agency, if there are a plurality of DHCP Server in the network segment at DHCP Client place, DHCP Client can choose one from these DHCP Server, not selected DHCP Server no longer responds the subsequent request of DHCP Client.If selected DHCP Server breaks down for a certain reason, can not receive response after causing DHCP Client to send request, timeout mechanism can re-transmit broadcast messages behind certain hour, and gravity treatment is one from other DHCP Server.The protocol message flow process is seen accompanying drawing 1, specifically describes as follows.
1), at first DHCP Client carries out Address requests at the network segment broadcasting DHCPDISCOVER (discovery) at own place message.
2), because the DHCPDISCOVER message is broadcasted, the DHCP Server of all same network segments can both receive this message, and response DHCPOFFER (response) message.DHCP Client collects these response messages, therefrom chooses a DHCP Server.
3), DHCP Client specifies the DHCPServer address of choosing in DHCPREQUEST (request) message, and this message of broadcast transmission.Because the DHCP Server in the address of having specified the DHCP Server that chooses in this message, the network segment judges whether address wherein is identical, inequality with the address of oneself, then do not carry out any processing after receiving message; Identical, then for DHCP Client distributes the address, and response DHCPACK (affirmation) message is given DHCP Client.
4), after DHCP Client receives the DHCPACK message, obtain the address success.
5), after DHCP Client uses the address, initiatively send DHCPRELEASE (release) message, request discharges the address.After DHCP Server receives this message, discharge corresponding address.So far flow process stops.
Consideration for the autgmentability aspect, DHCP Server does not generally separately exist in the network segment at DHCP Client place, but, pass to DHCP Server by its request with DHCP Client by introducing DHCP Relay, realize the purpose of the shared DHCP Server of a plurality of network segments.Its advantage be convenient to manage with configuration DHCP Server on data, a plurality of network segments only need be configured on a point, but this has also introduced another problem simultaneously: because request is given to DHCP Server by DHCP Relay, stipulate according to agreement, mode of unicast is adopted in message transmission between DHCP Relay and the DHCP Server, thereby must the explicit address that indicates DHCP Server on the DHCP Relay.Yet under the existing agent way, generally only support the single DHCP Server of configuration, when the DHCP Server that is disposed breaks down, all associated network segments all can not normally carry out the address and obtain, and cause the communication failure of whole system.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of method that improves server reliability in the dynamic main unit configuration protocol under proxy mode, is used to overcome the problem that breaks down and cause whole system to break down owing to the single DHCP Server that is disposed under the existing agent way.
To achieve these goals, the invention provides a kind of method that improves server reliability in the dynamic main unit configuration protocol under proxy mode, be used to comprise the system of dhcp client, Dynamic Host Configuration Protocol server, DHCP relay, it is characterized in that, comprising:
Step 2, described DHCP relay receive and handle the Address requests that described dhcp client sends, and choose a Dynamic Host Configuration Protocol server from a described n Dynamic Host Configuration Protocol server; And
Step 3 is carried out the protocol conversation process between described dhcp client, described DHCP relay and selected Dynamic Host Configuration Protocol server.
Described method, wherein, in the described step 1, the connection status of a described task and a described n Dynamic Host Configuration Protocol server comprises: active state, inactive state.
Described method, wherein, in the described step 1, the communication link between a described DHCP relay and a described n Dynamic Host Configuration Protocol server just often, described connection status is set to the active state; When the communication link between a described DHCP relay and the described n Dynamic Host Configuration Protocol server interrupted, described connection status was set to the inactive state.
Described method, wherein, in the described step 2, described DHCP relay is chosen the step of a Dynamic Host Configuration Protocol server from a described n Dynamic Host Configuration Protocol server, one of in the following way: applicable pattern, competitive way or load balancing mode first.
Described method, wherein, in the described step 2, described DHCP relay is chosen a Dynamic Host Configuration Protocol server by described applicable pattern first from a described n Dynamic Host Configuration Protocol server step is specially:
Step 51, described DHCP relay are searched and are obtained Dynamic Host Configuration Protocol server tabulation, and described Address requests are handed to first is in the Dynamic Host Configuration Protocol server of active state in the described Dynamic Host Configuration Protocol server tabulation; And
Step 52, with the described Dynamic Host Configuration Protocol server that first is in the active state as selected Dynamic Host Configuration Protocol server.
Described method, wherein, in the described step 2, described DHCP relay is chosen a Dynamic Host Configuration Protocol server by described competitive way from a described n Dynamic Host Configuration Protocol server step is specially:
Step 61, described DHCP relay are searched and are obtained Dynamic Host Configuration Protocol server tabulation, and described Address requests are handed to all are in the Dynamic Host Configuration Protocol server of active state in the described Dynamic Host Configuration Protocol server tabulation;
Step 62, all Dynamic Host Configuration Protocol server that are in the active state receive described Address requests, and return DHCPOFFER response to described DHCP relay;
Step 63, described DHCP relay receive and handle described DHCPOFFER response by receiving first treatment principle earlier, again the state machine corresponding to described dhcp client on the described DHCP relay are carried out state exchange according to the DHCP consensus standard after response is finished dealing with; And
Step 64, with the Dynamic Host Configuration Protocol server that obtains as selected Dynamic Host Configuration Protocol server.
Described method, wherein, in the described step 2, described DHCP relay is chosen a Dynamic Host Configuration Protocol server by described load balancing mode from a described n Dynamic Host Configuration Protocol server step is specially:
Step 71, described DHCP relay are searched and are obtained Dynamic Host Configuration Protocol server tabulation, and described Address requests is handed to i Dynamic Host Configuration Protocol server in the described Dynamic Host Configuration Protocol server tabulation; Wherein, i (i ∈ [0, n-1]) is the result who carries out the delivery gained after the hashed value again with n by the MAC Address of described dhcp client is asked;
Step 72 if the state of i Dynamic Host Configuration Protocol server is the inactive state, is then selected %n Dynamic Host Configuration Protocol server of j=(i+1); If the state of j Dynamic Host Configuration Protocol server still is the inactive state, then select %n Dynamic Host Configuration Protocol server of k=(j+1), by that analogy; And
Step 73, with the Dynamic Host Configuration Protocol server that obtains as selected Dynamic Host Configuration Protocol server.
Described method, wherein, in the described step 3, also comprise: cause described DHCP relay not receive that in a setting-up time selected Dynamic Host Configuration Protocol server is to the response of described Address requests and when overtime when selected Dynamic Host Configuration Protocol server breaks down, state machine corresponding to described dhcp client on the described DHCP relay is got back to initial condition, and changes described step 2 over to.
Useful technique effect of the present invention:
Adopt the inventive method, compared with prior art, improved the support of agency, and adopted DHCP Server selection mechanism flexibly a plurality of DHCP Server, overcome because single DHCP Server fault to the influence that whole system causes, has improved the reliability of address server.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Description of drawings
There is not DHCP protocol message flow chart under agency's the situation in Fig. 1;
Fig. 2 is a method flow schematic diagram of the present invention;
Fig. 3 is a DHCP protocol message flow chart under the agent way of the present invention;
Fig. 4 is the embodiment of the present invention networking.
Embodiment
Seeing also Fig. 2, is method flow schematic diagram of the present invention.This flow process has been described the method that improves server reliability in the dynamic main unit configuration protocol under proxy mode, and concrete steps are as follows:
Communication link between DHCP Relay and DHCP Server just often, connection status is set to active;
When the communication link between DHCP Relay and the DHCP Server interrupted, connection status was set to inactive.
In this step, three kinds of modes of choosing DHCP Server are arranged, specifically adopt any selection mode to depend on actual disposition.
Mode one, applicable pattern first
DHCP Relay hands to the DHCPDISCOVER of DHCP Client request that first is in the DHCP Server of active state in the DHCP Server tabulation that finds.
Mode two, competitive way
DHCP Relay hands to the Server that all are in the active state with the DHCPDISCOVER request of DHCP Client, follow-up after the DHCPOFFER response of receiving these DHCP Server, the response that arrives first is earlier processed, after finishing dealing with, the state machine corresponding to this DHCP Client on the DHCP Relay carries out state exchange.When other the response of DHCP Server comes one by one, because state switches in the DHCPClient state machine, therefore DHCP Relay thinks that the response of current these DHCP Server is illegal under present state, it is abandoned, thereby the purpose of a DHCP Server is chosen in realization.
Mode three, load balancing mode
DHCP Relay hands in the DHCP Server tabulation i with the DHCPDISCOVER of DHCP Client request, and (i ∈ [0, n-1]) individual DHCP Server, wherein, i is the result who carries out the delivery gained after the hashed value (hashing algorithm can with reference to RFC1071) again with n by the MAC Address of DHCP Client is asked.If i DHCP Server state is inactive, then select %n DHCP Server of j=(i+1); If j DHCP Server state still is inactive, then select %n DHCP Server of k=(j+1), by that analogy.
In this mode, MAC (Media Access Control) is medium access control, and RFC (Requestfor Comment) is for for your advice.
Seeing also Fig. 4, is the embodiment of the present invention networking.In conjunction with Fig. 3, wherein Relay links to each other with some main frames, and the place network segment is 10.10.1.0/24, and two Dynamic Host Configuration Protocol server are respectively 10.10.2.1/24 and 10.10.3.1/24.
At first, configuration n=2 DHCP Server (10.10.2.1/24 and 10.10.3.1/24) creates and initiating task serversMonitor on DHCP Relay, regularly detects the connection status of DHCP Relay and 2 DHCP Server;
Communication link between DHCP Relay and DHCP Server just often, connection status is set to active;
When the communication link between DHCP Relay and the DHCP Server interrupted, connection status was set to inactive.
Then, DHCP Relay receives the Address requests of PCi (i ∈ [0, n-1]), chooses DHCP Server.Three kinds of configurable modes of choosing are arranged.
Mode one is suitable for first
DHCP Relay searches the DHCP Server tabulation of oneself safeguarding, the DHCPDISCOVER request of PCi is transmitted to first that find is in the DHCP Server of active state.
Mode two, competitive way
DHCP Relay hands to the own DHCPServer that safeguards with the DHCPDISCOVER of PCi request, and all are in the DHCP Server of active state in tabulating.These DHCP Server can send DHCPOFFER and respond the Relay to DHCP after the request of receiving, for these responses, the elder generation that arrives first is processed, after finishing dealing with, the state machine corresponding to this DHCP Client on the DHCP Relay carries out state exchange (being converted to REQUESTING (asking) state from SELECTING (selecting)) according to the DHCP consensus standard.When other the response of DHCP Server comes one by one, because state switches in the DHCPClient state machine, therefore, DHCP Relay thinks that the response of current these DHCP Server is illegal under present state, it is abandoned, thereby the purpose of a DHCP Server is chosen in realization.
Mode three, load balancing mode
DHCP Relay calculates PC
iThe MAC Address hashed value: Hash=CheckSum (MAC
PCi)), then Hash and n delivery are obtained j=Hash%2.
DHCP Relay is with PC
iDHCPDISCOVER request hand to j (j ∈ [0,1]) DHCP Server in the DHCP Server tabulation.If j DHCP Server state is inactive, then select %2 DHCP Server of k=(j+1); If k DHCP Server state still is inactive, then select %2 DHCP Server of m=(k+1), by that analogy.
At last, according to shown in Figure 3, between DHCP Client, DHCP Relay and selected DHCP Server, finish follow-up protocol message flow process.If selected DHCP Server breaks down in the conversation procedure, the DHCP Server that causes DHCP Relay always to can not receive within a certain period of time choosing is to the response of DHCPClient message, cause overtime, DHCP Client state machine on the DHCP Relay is got back to initial condition, make DHCP Client carry out application IP addresses again, alternative DHCP Server carries out previous step.
The present invention proposes and dispose a plurality of DHCP Server under a kind of agent way and realize that DHCPServer chooses flexibly, the method that between DHCP Server, automaticallyes switch when breaking down, this method has overcome only supports the single DHCP Server of configuration under the existing agent way, when the DHCP Server that is disposed breaks down, the problem that causes the whole system fault easily, the reliability of raising address server.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (8)
1. method that improves server reliability in the dynamic main unit configuration protocol under proxy mode is used to comprise the system of dhcp client, Dynamic Host Configuration Protocol server, DHCP relay, it is characterized in that, comprising:
Step 1 disposes n Dynamic Host Configuration Protocol server on described DHCP relay, create the connection status of a described DHCP relay of a task and periodicmaintenance and a described n Dynamic Host Configuration Protocol server, and n is the natural number more than or equal to 2;
Step 2, described DHCP relay receive and handle the Address requests that described dhcp client sends, and choose a Dynamic Host Configuration Protocol server from a described n Dynamic Host Configuration Protocol server; And
Step 3 is carried out the protocol conversation process between described dhcp client, described DHCP relay and selected Dynamic Host Configuration Protocol server.
2. method according to claim 1 is characterized in that, in the described step 1, the connection status of a described task and a described n Dynamic Host Configuration Protocol server comprises: active state, inactive state.
3. method according to claim 2 is characterized in that, in the described step 1, the communication link between a described DHCP relay and a described n Dynamic Host Configuration Protocol server just often, described connection status is set to the active state; When the communication link between a described DHCP relay and the described n Dynamic Host Configuration Protocol server interrupted, described connection status was set to the inactive state.
4. according to claim 2 or 3 described methods, it is characterized in that in the described step 2, described DHCP relay is chosen the step of a Dynamic Host Configuration Protocol server from a described n Dynamic Host Configuration Protocol server, one of in the following way: applicable pattern, competitive way or load balancing mode first.
5. method according to claim 4 is characterized in that, in the described step 2, described DHCP relay is chosen a Dynamic Host Configuration Protocol server by described applicable pattern first from a described n Dynamic Host Configuration Protocol server step is specially:
Step 51, described DHCP relay are searched and are obtained Dynamic Host Configuration Protocol server tabulation, and described Address requests are handed to first is in the Dynamic Host Configuration Protocol server of active state in the described Dynamic Host Configuration Protocol server tabulation; And
Step 52, with the described Dynamic Host Configuration Protocol server that first is in the active state as selected Dynamic Host Configuration Protocol server.
6. method according to claim 4 is characterized in that, in the described step 2, described DHCP relay is chosen a Dynamic Host Configuration Protocol server by described competitive way from a described n Dynamic Host Configuration Protocol server step is specially:
Step 61, described DHCP relay are searched and are obtained Dynamic Host Configuration Protocol server tabulation, and described Address requests are handed to all are in the Dynamic Host Configuration Protocol server of active volt attitude in the described Dynamic Host Configuration Protocol server tabulation;
Step 62, all Dynamic Host Configuration Protocol server that are in the active state receive described Address requests, and return DHCPOFFER response to described DHCP relay;
Step 63, described DHCP relay receive and handle described DHCPOFFER response by receiving first treatment principle earlier, again the state machine corresponding to described dhcp client on the described DHCP relay are carried out state exchange according to the DHCP consensus standard after response is finished dealing with; And
Step 64, with the Dynamic Host Configuration Protocol server that obtains as selected Dynamic Host Configuration Protocol server.
7. method according to claim 4 is characterized in that, in the described step 2, described DHCP relay is chosen a Dynamic Host Configuration Protocol server by described load balancing mode from a described n Dynamic Host Configuration Protocol server step is specially:
Step 71, described DHCP relay are searched and are obtained Dynamic Host Configuration Protocol server tabulation, and described Address requests is handed to i Dynamic Host Configuration Protocol server in the described Dynamic Host Configuration Protocol server tabulation; Wherein, i (i ∈ [0, n-1]) is the result who carries out the delivery gained after the hashed value again with n by the MAC Address of described dhcp client is asked;
Step 72 if the state of i Dynamic Host Configuration Protocol server is the inactive state, is then selected %n Dynamic Host Configuration Protocol server of j=(i+1); If the state of j Dynamic Host Configuration Protocol server still is the inactive state, then select %n Dynamic Host Configuration Protocol server of k=(j+1), by that analogy; And
Step 73, with the Dynamic Host Configuration Protocol server that obtains as selected Dynamic Host Configuration Protocol server.
8. according to claim 5,6 or 7 described methods, it is characterized in that, in the described step 3, also comprise: cause described DHCP relay not receive that in a setting-up time selected Dynamic Host Configuration Protocol server is to the response of described Address requests and when overtime when selected Dynamic Host Configuration Protocol server breaks down, state machine corresponding to described dhcp client on the described DHCP relay is got back to initial condition, and changes described step 2 over to.
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| CN102098354A (en) * | 2011-02-28 | 2011-06-15 | 北京星网锐捷网络技术有限公司 | Method and server for allocating dynamic host configuration protocol (DHCP) addresses |
| CN102647290A (en) * | 2011-02-17 | 2012-08-22 | 中兴通讯股份有限公司 | Method and device of network keepalive connection under dynamic address configuration |
| US8296438B2 (en) | 2007-07-11 | 2012-10-23 | International Business Machines Corporation | Dynamically configuring a router to find the best DHCP server |
| CN102904972A (en) * | 2011-07-27 | 2013-01-30 | 康佳集团股份有限公司 | Local area network DHCP (Dynamic host configuration protocol) address fault seamless switching method and implementation system thereof |
| CN103685313A (en) * | 2013-12-26 | 2014-03-26 | 北京中电普华信息技术有限公司 | Communication method and system applied to online examination |
| WO2017000625A1 (en) * | 2015-06-30 | 2017-01-05 | 中兴通讯股份有限公司 | Dynamic host configuration protocol (dhcp) server management method and apparatus |
| CN108259636A (en) * | 2017-09-29 | 2018-07-06 | 新华三技术有限公司 | A kind of message processing method and device |
| WO2021135795A1 (en) * | 2019-12-30 | 2021-07-08 | 中兴通讯股份有限公司 | Message processing method, relay device, system, and storage medium |
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| CN100334855C (en) * | 2004-08-17 | 2007-08-29 | 杭州华为三康技术有限公司 | Method to allocate protocol relay address table and server address pool for synchronization dynamic host machine |
| CN100553264C (en) * | 2006-04-12 | 2009-10-21 | 杭州华三通信技术有限公司 | A kind of method and apparatus that in dynamic host configure process, carries out relaying |
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| US8296438B2 (en) | 2007-07-11 | 2012-10-23 | International Business Machines Corporation | Dynamically configuring a router to find the best DHCP server |
| CN101690132B (en) * | 2007-07-11 | 2013-04-17 | 国际商业机器公司 | Method and device for executing configuration protocol request of network host |
| CN102647290A (en) * | 2011-02-17 | 2012-08-22 | 中兴通讯股份有限公司 | Method and device of network keepalive connection under dynamic address configuration |
| CN102647290B (en) * | 2011-02-17 | 2016-10-19 | 南京中兴软件有限责任公司 | The method and apparatus that a kind of dynamic address configuration lower network connects keep-alive |
| CN102098354B (en) * | 2011-02-28 | 2014-09-10 | 北京星网锐捷网络技术有限公司 | Method and server for allocating dynamic host configuration protocol (DHCP) addresses |
| CN102098354A (en) * | 2011-02-28 | 2011-06-15 | 北京星网锐捷网络技术有限公司 | Method and server for allocating dynamic host configuration protocol (DHCP) addresses |
| CN102904972A (en) * | 2011-07-27 | 2013-01-30 | 康佳集团股份有限公司 | Local area network DHCP (Dynamic host configuration protocol) address fault seamless switching method and implementation system thereof |
| CN102904972B (en) * | 2011-07-27 | 2017-05-03 | 康佳集团股份有限公司 | Local area network DHCP (Dynamic host configuration protocol) address fault seamless switching method and implementation system thereof |
| CN103685313A (en) * | 2013-12-26 | 2014-03-26 | 北京中电普华信息技术有限公司 | Communication method and system applied to online examination |
| WO2017000625A1 (en) * | 2015-06-30 | 2017-01-05 | 中兴通讯股份有限公司 | Dynamic host configuration protocol (dhcp) server management method and apparatus |
| CN106331202A (en) * | 2015-06-30 | 2017-01-11 | 中兴通讯股份有限公司 | Dynamic host configuration protocol (DHCP) server management method and device |
| CN108259636A (en) * | 2017-09-29 | 2018-07-06 | 新华三技术有限公司 | A kind of message processing method and device |
| CN108259636B (en) * | 2017-09-29 | 2021-11-02 | 新华三技术有限公司 | Message processing method and device |
| WO2021135795A1 (en) * | 2019-12-30 | 2021-07-08 | 中兴通讯股份有限公司 | Message processing method, relay device, system, and storage medium |
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| CN101197811B (en) | 2011-05-11 |
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