CN101729559B - Method and system for realizing backup of DHCP server - Google Patents
Method and system for realizing backup of DHCP server Download PDFInfo
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- CN101729559B CN101729559B CN 200910225585 CN200910225585A CN101729559B CN 101729559 B CN101729559 B CN 101729559B CN 200910225585 CN200910225585 CN 200910225585 CN 200910225585 A CN200910225585 A CN 200910225585A CN 101729559 B CN101729559 B CN 101729559B
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Abstract
The invention discloses a method for realizing backup of a dynamic host configuration protocol (DHCP) server, which comprises that: a user host acquires an IP address from a main DHCP SERVER through a DHCP RELAY; the user host requests for reletting and does not receive a response of the main DHCP SERVER, the DHCP RELAY initiates an IP address request to a standby DHCP SERVER; and the DHCP RELAY applies for and acquires the IP address, and sends a compulsory reletting message to the user host. The invention also correspondingly discloses a system for realizing the backup of the DHCP server; and when the main DHCP SERVER is not available, the online user host does not need experiencing processes of releasing the IP address and applying for the IP address once again and can realize the switching of the DHCP SERVER; therefore, the method and the system can avoid off line of users due to the fault of the DHCP SERVER, improve the satisfaction of the users, and relieve the pressure of network equipment due to on line again of the users together.
Description
Technical field
(Dynamic Host Configuration Protocol, DHCP) technology relate in particular to implementation method and system that a kind of Dynamic Host Configuration Protocol server (SERVER) backs up to the present invention relates to DHCP.
Background technology
In the network based on ICP/IP protocol, the communication between the computer is to realize through unique IP address, uses the DHCP agreement, and subscriber's main station can obtain the IP address to DHCP SERVER dynamic requests.Because the DHCP message adopts broadcast mode; Can't pass through a plurality of subnets, so the basic networking regular meeting of existing access network introduces DHCP relay (RELAY); Make the subscriber's main station that is between different segment and the DHCP SERVER can intercommunication; Concrete, subscriber's main station is issued DHCP RELAY with request message, by DHCP RELAY request message is forwarded to DHCP SERVER and handles; DHCP SERVER also can issue DHCP RELAY for user's back message using, is responsible for message is forwarded to subscriber's main station by DHCP RELAY again.
For access network, generally (Service-control Node SN) takes on DHCP RELAY, and it is mutual with DHCP SERVER that promptly SN can be used as RELAY by the customer service Control Node.
In order to improve the reliability of network, can in network, dispose a plurality of DHCP SERVER usually and back up mutually, Fig. 1 is the network topology sketch map when disposing two DHCP SERVER in the network; It is as shown in Figure 1,, DHCP RELAY connects main DHCP SERVER and is equipped with DHCP SERVER; Fig. 2 has in the network of active and standby DHCP SERVER for existing; Subscriber's main station obtains the IP address and re-rents the schematic flow sheet of IP address, and is as shown in Figure 2, and the process that subscriber's main station obtains the IP address and re-rents the IP address is:
Step 201: subscriber's main station successfully gets access to the IP address via DHCP RELAY from main DHCP SERVER.
Step 202: subscriber's main station in the moment in rental period 50% clean culture re-rent message, re-rent this IP address to main DHCP SERVER request, if re-rent success then can change step 205 over to; If re-rent failure then change step 203 over to.
Step 203: subscriber's main station in moment in rental period 87.5% broadcasting re-rent message, the IP address is re-rented in request, if re-rent success then change step 205 over to; If re-rent failure then change step 204 over to.
Step 204: the IP address that subscriber's main station release steps 201 when the rental period expires is obtained, to being equipped with DHCP SERVER application IP address, re-rent the IP address from being equipped with DHCP SERVER afterwards again, flow process finishes.
Step 205: subscriber's main station continues to re-rent the IP address from main DHCP SERVER.
Based on said method, when main DHCP SERVER is unavailable, can cause the online user to re-rent failure, cause the IP address release that expires, customer traffic disruption, the user needs again to being equipped with DHCP SERVER applied address, and user satisfaction is relatively poor; At this moment, because a large number of users is concurrent reaches the standard grade, concurrent user's flow can bring the instantaneous user impact of reaching the standard grade to access device, thereby bring very big pressure to the network equipment.
Summary of the invention
In view of this; Main purpose of the present invention is to provide a kind of implementation method and system of Dynamic Host Configuration Protocol server backup; Can avoid the user offline that causes because of DHCP SERVER fault, improve user satisfaction, and alleviate the concurrent again pressure of reaching the standard grade and bringing of user to the network equipment.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of implementation method of Dynamic Host Configuration Protocol server backup comprises:
Subscriber's main station obtains the IP address via dynamic host configuration protocol relay DHCP RELAY from active attitude host configuration protocol server DHCP SERVER;
The response of re-renting of main DHCP SERVER is re-rented and in preset time, is not received in the subscriber's main station request, and then DHCP RELAY initiates the IP application IP addresses to being equipped with DHCP SERVER;
DHCP RELAY applies for the IP address from being equipped with DHCP SERVER, then sends to subscriber's main station and forces to re-rent message, and the transmission of notice subscriber's main station is re-rented message and re-rented to being equipped with DHCP SERVER request.
Subscriber's main station after main DHCP SERVER obtains the IP address, also comprises step via DHCP RELAY:
The IP address of the DHCPSERVER that the IP address that DHCP RELAY recording user MAC, user obtain, user use, the DHCP SERVER that said user uses is main DHCP SERVER;
Said subscriber's main station request is re-rented to: subscriber's main station and is re-rented to the DHCP SERVER request that the active user uses.
DHCP RELAY also comprises step after DHCP SERVER applies for the IP address fully: DHCP RELAY is modified as DHCP SERVER fully with the DHCP SERVER of this user's use of local record.
Said DHCP RELAY to being equipped with DHCP SERVER initiation IP application IP addresses is: DHCP RELAY sends IP application message to being equipped with DHCP SERVER, and said IP application message carries the IP address of user MAC, the current use of subscriber's main station.
Said DHCP RELAY to being equipped with DHCP SERVER initiation IP application IP addresses is: the response of re-renting that main DHCP SERVER was re-rented and in preset time, do not received to subscriber's main station in the request of 50% o'clock rental period; Then said DHCP RELAY initiates the IP application IP addresses to being equipped with DHCP SERVER; Perhaps; The response of re-renting that main DHCP SERVER was re-rented and in preset time, do not received to subscriber's main station in the request of 87.5% o'clock rental period, then said DHCP RELAY initiates the IP application IP addresses to being equipped with DHCP SERVER.
The realization system of a kind of Dynamic Host Configuration Protocol server backup comprises: subscriber's main station, DHCP RELAY, main DHCP SERVER and be equipped with DHCP SERVER,
Said subscriber's main station is used for obtaining the IP address through DHCP RELAY from main DHCP SERVER, and initiates the request of re-renting at fixed time to the DHCP of current use SERVER; And receive re-rent message from the pressure of DHCP RELAY after, send and re-rent message and re-rent to being equipped with DHCP SERVER request.
Said DHCP RELAY, be used to realize subscriber's main station with main DHCP SERVER, be equipped with communicating by letter between the DHCP SERVER; And when the subscriber's main station request re-rents and in preset time, do not receive that re-renting of main DHCP SERVER responded, initiate the IP application IP addresses to being equipped with DHCP SERVER; And, send to subscriber's main station and to force to re-rent message after be equipped with DHCP SERVER and apply for the IP address;
Said main DHCP SERVER, be equipped with DHCP SERVER; All be used for according to the request message of subscriber's main station through DHCP RELAY transmission; Be subscriber's main station distributing IP address, and return corresponding response through the request of re-renting that DHCP RELAY sends according to subscriber's main station.
Said DHCP RELAY; Also be used for subscriber's main station via DHCP RELAY after main DHCP SERVER obtains the IP address; The IP address of the DHCP SERVER that the IP address that recording user MAC, user obtain, user use, the DHCP SERVER that said user uses is main DHCPSERVER.
Said DHCP RELAY also is used for from being equipped with after DHCP SERVER applies for the IP address, and the DHCP SERVER that this user of local record is used is modified as DHCP SERVER fully.
Said DHCP RELAY also is used for sending IP application message to being equipped with DHCP SERVER, and said IP application message carries the IP address of user MAC, the current use of subscriber's main station.
Said DHCP RELAY; Also be used for asking to re-rent and in preset time, do not receive under the situation of re-renting response of main DHCP SERVER 50% o'clock rental period at subscriber's main station; Initiate the IP application IP addresses to being equipped with DHCP SERVER; Perhaps, asked to re-rent and in preset time, do not receive under the situation of re-renting response of main DHCP SERVER 87.5% o'clock rental period, then initiate the IP application IP addresses to being equipped with DHCP SERVER at subscriber's main station.
The implementation method and the system of Dynamic Host Configuration Protocol server backup of the present invention; When re-renting failure by the unavailable online user who causes of main DHCP SERVER; DHCP RELAY is modeled to subscriber's main station with oneself, to being equipped with the SERVER applied address, realizes that online user profile is in the backup that is equipped with on the DHCP SERVER.Through the present invention; When main DHCP SERVER is unavailable; Online subscriber's main station need not to experience releasing IP addresses, applies for the process of IP address just realizing the switching of DHCP SERVER again, so can avoid the user offline that causes because of DHCP SERVER fault; Improve user satisfaction, and alleviate the concurrent again pressure of reaching the standard grade and bringing of user to the network equipment.
Description of drawings
Fig. 1 is the network topology sketch map when disposing two DHCP SERVER in the network;
Fig. 2 has in the network of active and standby DHCP SERVER for existing, and subscriber's main station obtains the IP address and re-rents the schematic flow sheet of IP address;
Fig. 3 is the implementation method schematic flow sheet of Dynamic Host Configuration Protocol server backup of the present invention.
Embodiment
Basic thought of the present invention is: when re-renting failure by the unavailable online user who causes of main DHCP SERVER, DHCP RELAY is modeled to subscriber's main station with oneself, to being equipped with the SERVER applied address, realizes that online user profile is in the backup that is equipped with on the DHCP SERVER.
Below in conjunction with accompanying drawing the enforcement of technical scheme is done further to describe in detail.
Fig. 3 is for the implementation method schematic flow sheet of Dynamic Host Configuration Protocol server backup of the present invention, and is as shown in Figure 3, and the implementation method of Dynamic Host Configuration Protocol server backup of the present invention may further comprise the steps:
Step 301: subscriber's main station obtains the IP address via DHCP RELAY from main DHCP SERVER.
In the last line process of user, subscriber's main station obtains IP address via DHCP RELAY from main DHCP SERVER through DHCP.
Step 302: subscriber's main station successfully obtains the IP address, then the IP address of the DHCP SERVER that uses of the IP address that obtains of DHCP RELAY recording user MAC, user, user.
Concrete, DHCP RELAY is according to the information such as mutual message accounting user MAC of subscriber's main station and DHCP SERVER.
When step 303:DHCP RELAY judges host requests is re-rented, the response of re-renting of whether in preset time, receiving main DHCP SERVER, if, execution in step 307; Otherwise, execution in step 304.
Need to prove that the judgement of this step can be carried out in the operation back of re-renting that 50% o'clock rental period carried out, also can carry out in the operation back of re-renting that 87.5% o'clock rental period carried out.The subscriber's main station request is re-rented and is generally: the DHCP SERVER request to the active user uses is re-rented.
Step 304:DHCP RELAY initiates the IP application IP addresses to being equipped with DHCP SERVER.
Here; When the subscriber's main station request is re-rented; Main DHCP SERVER no response, then DHCP RELAY thinks that main DHCP SERVER is unavailable, and oneself is modeled to subscriber's main station; Structure IP application message is initiated one and is taken turns the IP application IP addresses to being equipped with DHCP SERVER, reaches the user profile of having reached the standard grade with this process in the backup that is equipped with on the DHCP SERVER.Here, IP application message carries the IP address of user MAC, the current use of subscriber's main station, and promptly subscriber's main station is in IP address that step 301 is obtained.
Step 305:DHCP RELAY successfully applies for the IP address from being equipped with DHCP SERVER; The DHCP SERVER that then this user of local record is used is modified as DHCP SERVER fully; And send pressure to subscriber's main station and re-rent (FORCE RENEW) message, the force users main frame is re-rented once more.
Step 306: after subscriber's main station is received and forced to re-rent message; Transmission is re-rented message and is re-rented to being equipped with the DHCPSERVER request, and rental period information reaches consistent on re-renting successfully back subscriber's main station and being equipped with DHCP SERVER, afterwards; Subscriber's main station is re-rented the IP address from being equipped with DHCP SERVER, and flow process finishes.
Step 307: subscriber's main station continues to re-rent the IP address from main DHCP SERVER.
The present invention also proposes the realization system of a kind of Dynamic Host Configuration Protocol server backup, comprising: subscriber's main station, DHCP RELAY, main DHCP SERVER and be equipped with DHCP SERVER, wherein,
Subscriber's main station is used for obtaining the IP address through DHCP RELAY from main DHCP SERVER, and initiates the request of re-renting at fixed time to the DHCP of current use SERVER; And receive re-rent message from the pressure of DHCP RELAY after, send and re-rent message and re-rent to being equipped with DHCP SERVER request.
DHCP RELAY, be used to realize subscriber's main station with main DHCP SERVER, be equipped with communicating by letter between the DHCP SERVER; And when the subscriber's main station request re-rents and in preset time, do not receive that re-renting of main DHCP SERVER responded, initiate the IP application IP addresses to being equipped with DHCP SERVER; And, send to subscriber's main station and to force to re-rent message after be equipped with DHCP SERVER and apply for the IP address;
Main DHCP SERVER, be equipped with DHCP SERVER, all be used for according to subscriber's main station being the subscriber's main station distributing IP, and returning corresponding response through the request of re-renting that DHCP RELAY sends according to subscriber's main station through the request message that DHCP RELAY sends.
DHCP RELAY, also be used for subscriber's main station via DHCP RELAY after DHCP SERVER obtains the IP address, the IP address of the DHCP SERVER that use the IP address that recording user MAC, user obtain, user.
DHCP RELAY also is used for from being equipped with after DHCP SERVER applies for the IP address, and the DHCP SERVER that this user of local record is used is modified as DHCP SERVER fully.
DHCP RELAY also is used for sending IP application message to being equipped with DHCP SERVER, and said IP application message carries the IP address of user MAC, the current use of subscriber's main station.
DHCP RELAY; Also be used for asking to re-rent and in preset time, do not receive under the situation of re-renting response of main DHCP SERVER 50% o'clock rental period at subscriber's main station; Initiate the IP application IP addresses to being equipped with DHCP SERVER; Perhaps, asked to re-rent and in preset time, do not receive under the situation of re-renting response of main DHCP SERVER 87.5% o'clock rental period, then initiate the IP application IP addresses to being equipped with DHCP SERVER at subscriber's main station.
Can find out that when main DHCP SERVER was unavailable, rolling off the production line on online subscriber's main station need not again directly to continue the IP address that the use initial application is arrived, and has improved user satisfaction effectively; And, by this method, only when main DHCP SERVER is unavailable, just can trigger to being equipped with the synchronous online user's information of DHCPSERVER, need not to keep in real time the information unanimity of active and standby DHCP SERVER can reach the effect of level and smooth backup.
The above is merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention.
Claims (10)
1. the implementation method of Dynamic Host Configuration Protocol server backup is characterized in that this method comprises:
Subscriber's main station obtains the IP address via dynamic host configuration protocol relay DHCP RELAY from active attitude host configuration protocol server DHCP SERVER;
The response of re-renting of main DHCP SERVER is re-rented and in preset time, is not received in the subscriber's main station request, and then DHCP RELAY initiates the IP application IP addresses to being equipped with DHCP SERVER;
DHCP RELAY applies for the IP address from being equipped with DHCP SERVER, then sends to subscriber's main station and forces to re-rent message, and the transmission of notice subscriber's main station is re-rented message and re-rented to being equipped with DHCP SERVER request.
2. method according to claim 1 is characterized in that, subscriber's main station after main DHCP SERVER obtains the IP address, also comprises step via DHCP RELAY:
The IP address of the DHCP SERVER that the IP address that DHCP RELAY recording user MAC, user obtain, user use, the DHCP SERVER that said user uses is main DHCP SERVER;
Said subscriber's main station request is re-rented to: subscriber's main station and is re-rented to the DHCP SERVER request that the active user uses.
3. method according to claim 2 is characterized in that, DHCP RELAY also comprises step after DHCP SERVER applies for the IP address fully: DHCP RELAY is modified as DHCP SERVER fully with the DHCP SERVER of this user's use of local record.
4. method according to claim 3; It is characterized in that; Said DHCP RELAY to being equipped with DHCP SERVER initiation IP application IP addresses is: DHCP RELAY sends IP application message to being equipped with DHCP SERVER, and said IP application message carries the IP address of user MAC, the current use of subscriber's main station.
5. according to each described method of claim 1 to 4; It is characterized in that; Said DHCP RELAY to being equipped with DHCP SERVER initiation IP application IP addresses is: the response of re-renting that main DHCP SERVER was re-rented and in preset time, do not received to subscriber's main station in the request of 50% o'clock rental period; Then said DHCP RELAY initiates the IP application IP addresses to being equipped with DHCP SERVER; Perhaps, the response of re-renting that main DHCP SERVER was re-rented and in preset time, do not received to subscriber's main station in the request of 87.5% o'clock rental period, then said DHCP RELAY initiates the IP application IP addresses to being equipped with DHCP SERVER.
6. the realization system of Dynamic Host Configuration Protocol server backup comprises: subscriber's main station, DHCP RELAY, main DHCP SERVER and be equipped with DHCP SERVER, it is characterized in that,
Said subscriber's main station is used for obtaining the IP address through DHCP RELAY from main DHCP SERVER, and initiates the request of re-renting at fixed time to the DHCP of current use SERVER; And receive re-rent message from the pressure of DHCP RELAY after, send and re-rent message and re-rent to being equipped with DHCP SERVER request;
Said DHCP RELAY, be used to realize subscriber's main station with main DHCP SERVER, be equipped with communicating by letter between the DHCP SERVER; And when the subscriber's main station request re-rents and in preset time, do not receive that re-renting of main DHCP SERVER responded, initiate the IP application IP addresses to being equipped with DHCP SERVER; And, send to subscriber's main station and to force to re-rent message after be equipped with DHCP SERVER and apply for the IP address;
Said main DHCP SERVER, be equipped with DHCP SERVER; All be used for according to the request message of subscriber's main station through DHCP RELAY transmission; Be subscriber's main station distributing IP address, and return corresponding response through the request of re-renting that DHCP RELAY sends according to subscriber's main station.
7. system according to claim 6; It is characterized in that; Said DHCP RELAY; Also be used for subscriber's main station via DHCP RELAY after main DHCP SERVER obtains the IP address, the IP address of the DHCP SERVER that use the IP address that recording user MAC, user obtain, user, the DHCP SERVER that said user uses is main DHCP SERVER.
8. system according to claim 7 is characterized in that, said DHCP RELAY also is used for from being equipped with after DHCP SERVER applies for the IP address, and the DHCP SERVER that this user of local record is used is modified as DHCP SERVER fully.
9. system according to claim 8 is characterized in that, said DHCP RELAY also is used for sending IP application message to being equipped with DHCP SERVER, and said IP application message carries the IP address of user MAC, the current use of subscriber's main station.
10. according to each described system of claim 6 to 8; It is characterized in that; Said DHCP RELAY; Also be used for asking to re-rent and in preset time, do not receive under the situation of re-renting response of main DHCP SERVER 50% o'clock rental period, initiate the IP application IP addresses to being equipped with DHCP SERVER, perhaps at subscriber's main station; Ask to re-rent and in preset time, do not receive under the situation of re-renting response of main DHCP SERVER 87.5% o'clock rental period at subscriber's main station, then initiate the IP application IP addresses to being equipped with DHCP SERVER.
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| CN 200910225585 CN101729559B (en) | 2009-12-03 | 2009-12-03 | Method and system for realizing backup of DHCP server |
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| CN 200910225585 CN101729559B (en) | 2009-12-03 | 2009-12-03 | Method and system for realizing backup of DHCP server |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN102082733B (en) * | 2011-02-25 | 2013-06-26 | 杭州华三通信技术有限公司 | Portal system and access method thereof |
| JP5633749B2 (en) * | 2011-04-28 | 2014-12-03 | 村田機械株式会社 | Relay server and relay communication system |
| CN102299932B (en) * | 2011-09-22 | 2015-03-18 | 杭州华三通信技术有限公司 | Backup method for DHCP (Dynamic Host Configuration Protocol) server and DHCP server |
| CN102404146B (en) * | 2011-11-17 | 2014-10-29 | 福建星网锐捷网络有限公司 | Master-slave switching method, network device and DHCP server |
| CN104639364B (en) * | 2014-12-02 | 2018-05-25 | 重庆尊贤科技有限公司 | The DHCP backup methods that main Dynamic Host Configuration Protocol server is supported and coordinated are not depended on |
| CN106341366A (en) * | 2015-07-06 | 2017-01-18 | 中兴通讯股份有限公司 | Method and device for backuping multiple key servers and key server |
| CN109660378B (en) * | 2017-10-12 | 2022-04-29 | 中兴通讯股份有限公司 | Method, device, equipment and storage medium for maintaining normal communication of home gateway |
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