CN102404146A - Master-slave switching method, network device and DHCP server - Google Patents
Master-slave switching method, network device and DHCP server Download PDFInfo
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- CN102404146A CN102404146A CN2011103664142A CN201110366414A CN102404146A CN 102404146 A CN102404146 A CN 102404146A CN 2011103664142 A CN2011103664142 A CN 2011103664142A CN 201110366414 A CN201110366414 A CN 201110366414A CN 102404146 A CN102404146 A CN 102404146A
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Abstract
The invention provides a master-slave switching method, a network device and a DHCP server. The method comprises the following steps that a DHCP repeater transmits the DHCP request message to a DHCP master server and receives the DHCP response message returned by the DHCP master server; if the DHCP repeater parses the DHCP response message to obtain the IP address and master-slave switching identifier of a DHCP slave server, the DHCP repeater executes the master-slave switching between the DHCP master server and the DHCP slave server according to the switching strategy corresponding to the master-slave switching identifier. According to the master-slave switching method, the network device and the DHCP server, the problem that the master server and slave server work at the same time, caused by that the state of the master serve and slave server is judged improperly can be solved.
Description
Technical field
The present invention relates to the master-slave equipment coordination technique, relate in particular to a kind of master-slave switching method, the network equipment and Dynamic Host Configuration Protocol server, belong to wireless communication technology field.
Background technology
(Dynamic Host Configuration Protocol, DHCP) operating mechanism of employing client and server is a kind of TCP/IP standard of simplifying the host IP address configuration management to DHCP.This standard allows Dynamic Host Configuration Protocol server to client IP address and other relevant configuration information to be provided.Dhcp client obtains the IP address through sending the broadcasting packet application, when Dynamic Host Configuration Protocol server with dhcp client during a local area network (LAN) inside, Dynamic Host Configuration Protocol server can directly be dhcp client distributing IP address.When dhcp client and Dynamic Host Configuration Protocol server need not transmitted the DHCP request message through the DHCP relay device at the local area network (LAN) deployed DHCP relay device at dhcp client place when a local area network (LAN) is inner.The DHCP relay device carries local gateway address and in the DHCP message, sends to Dynamic Host Configuration Protocol server in the lump in the process that E-Packets.Dynamic Host Configuration Protocol server is the IP address of user's distribution with the gateway same network segment according to the gateway address in the DHCP message.Fig. 1 is the topology diagram that a kind of DHCP uses.As shown in Figure 1, Dynamic Host Configuration Protocol server and dhcp client be not in a local area network (LAN), and during dhcp client application IP address, the DHCP relay device carries out the DHCP message forwarding between dhcp client and Dynamic Host Configuration Protocol server.
Usually, in order to prevent Dynamic Host Configuration Protocol server Single Point of Faliure problem, in DHCP uses, can dispose two Dynamic Host Configuration Protocol server, one is the DHCP master server, and another is that DHCP is from server.When master server is hung up, activate role that DHCP bears master server rapidly from server through certain technology and continue as that the user provides the application IP addresses service in the network.Fig. 2 has the topology diagram that heat is equipped with the DHCP application of structure.As shown in Figure 2, Dynamic Host Configuration Protocol server is divided into DHCP master server and DHCP from server.The DHCP master server can be given data sync from server in the process of address assignment, at the master server duration of work, does not work from server, only accomplishes the backup functionality of data.The DHCP master server and from the backup between server relation usually through one independently backup path carry out, can be direct-connected between the passage also can be interconnected through intermediate equipment.Pass through to send out mutually the keep-alive message between principal and subordinate's server to confirm the other side's operating state; After not receiving keep-alive message certain hour, confirm the master server operation irregularity and take over master server and accomplish DHCP and share out the work from server; And, the DHCP master server will proceed work by master server after resuming work from the data in server content synchronization to master server.
When adopting aforesaid way to coordinate switching between server of DHCP master server and DHCP, if under the fully normal situation of master server work, the communication link disconnection between principal and subordinate's server, the situation that then can cause principal and subordinate's server to work simultaneously.Because principal and subordinate's server configuration usually is identical, therefore under the situation that principal and subordinate's server is worked simultaneously, will cause the conflict of whole net addresses distributed.
Summary of the invention
To above-mentioned defective, the present invention provides a kind of master-slave switching method, the network equipment and Dynamic Host Configuration Protocol server, in order to solve the problem of working simultaneously because of the improper principal and subordinate's of the causing server of state judgement between principal and subordinate's server.
According to an aspect of the present invention, a kind of master-slave switching method is provided, comprises:
The DHCP relay device is transmitted the DHCP request message to the DHCP master server, and receives the dhcp response message that said DHCP master server returns;
If said DHCP relay device is through resolving said dhcp response message; Obtain DHCP and switch sign, then switch the pairing switchover policy of sign and carry out said DHCP master server and said DHCP switches from the principal and subordinate between the server according to said principal and subordinate from the IP address and the principal and subordinate of server.
According to a further aspect in the invention, a kind of network equipment is provided also, comprises:
Transceiver module is used for transmitting the DHCP request message to the DHCP master server, and receives the dhcp response message that said DHCP master server returns;
Principal and subordinate's handover module; Be used for if through resolving said dhcp response message; Obtain DHCP and switch sign, then switch the pairing switchover policy of sign and carry out said DHCP master server and said DHCP switches from the principal and subordinate between the server according to said principal and subordinate from the IP address and the principal and subordinate of server.。
According to another aspect of the invention, a kind of master-slave switching method is provided also, comprises:
Dynamic Host Configuration Protocol server receives the DHCP request message that the DHCP relay device is transmitted;
Said Dynamic Host Configuration Protocol server is according to said DHCP request message; Return the dhcp response message to said DHCP relay device; Wherein said dhcp response message carries the IP address and the principal and subordinate that back up Dynamic Host Configuration Protocol server and switches sign; The principal and subordinate is switched sign, then switches the pairing switchover policy of sign according to said principal and subordinate and carries out said DHCP master server and said DHCP switches from the principal and subordinate between the server.
In accordance with a further aspect of the present invention, a kind of Dynamic Host Configuration Protocol server is provided also, comprises:
Receiver module is used to receive the DHCP request message that the DHCP relay device is transmitted;
Respond module; Be used for according to said DHCP request message; Return the dhcp response message to said DHCP relay device; Wherein said dhcp response message carries the IP address and the principal and subordinate that back up Dynamic Host Configuration Protocol server and switches sign, and the pairing switchover policy of sign is carried out said DHCP master server and said DHCP switches from the principal and subordinate between the server so that said DHCP relay device switches according to said principal and subordinate.
According to master-slave switching method of the present invention, the network equipment and Dynamic Host Configuration Protocol server; Through from the dhcp response message, learning IP address and the switchover policy of DHCP from server by the DHCP relay device; Carrying out the principal and subordinate according to switchover policy switches; Because this principal and subordinate's handover operation is judged by the DHCP relay device and carry out the DHCP relay device sends the DHCP request message to which server, then which server is a workspace server; So the situation that DHCP master server and DHCP work from server simultaneously can not appear, thus avoided because of DHCP master server and DHCP be that dhcp client duplicate allocation IP causes the chaotic problem of IP from server.
Description of drawings
Fig. 1 is the topology diagram that a kind of DHCP uses.
Fig. 2 has the topology diagram that heat is equipped with the DHCP application of structure.
Fig. 3 is the schematic flow sheet of master-slave switching method of the present invention.
The first example signaling diagram of Fig. 4 for communicating by letter between DHCP relay device in the master-slave switching method of the present invention and the master and slave server of DHCP.
The second example signaling diagram of Fig. 5 for communicating by letter between DHCP relay device in the master-slave switching method of the present invention and the master and slave server of DHCP.
Fig. 6 is the structural representation of the network equipment of the present invention.
Fig. 7 is the schematic flow sheet of another master-slave switching method of the present invention.
Fig. 8 is the structural representation of Dynamic Host Configuration Protocol server of the present invention.
Embodiment
Fig. 3 is the schematic flow sheet of master-slave switching method of the present invention.As shown in Figure 3, this master-slave switching method comprises:
Step S301, the DHCP relay device is transmitted the DHCP request message to the DHCP master server, and receives the dhcp response message that said DHCP master server returns;
Step S302; If the DHCP relay device is through resolving said dhcp response message; Obtain DHCP and switch sign, then switch the pairing switchover policy of sign and carry out said DHCP master server and said DHCP switches from the principal and subordinate between the server according to said principal and subordinate from the IP address and the principal and subordinate of server.
The master-slave switching method of the foregoing description can be applicable to topological structure shown in Figure 2.
Particularly, be provided with the IP address of DHCP master server in the DHCP relay device in advance.Under the initial condition, DHCP relay device and DHCP master server communicate, i.e. DHCP master server work of treatment state is dhcp client distributing IP address.
When the dhcp client access network, send the DHCP request message to the DHCP relay device.After the DHCP relay device receives the DHCP request message,, transmit this DHCP request message to the DHCP master server according to the IP address of pre-configured DHCP master server.After the DHCP master server receives the DHCP request message, respond this DHCP request message, carry out IP distribution etc., and return the dhcp response message to the DHCP relay device to this dhcp client.Table 1 is the field structure table of dhcp response message.
Table 1
Wherein, the DHCP master server carries following information in optional (option) of dhcp response message field:
The 1st byte (taking the 0-7 bit) is with being used to represent that the entrained IP address of this field 2-5 byte is IP address or the DHCP of the DHCP master server sign from the IP address of server, and 0 expression DHCP is from server, 1 expression DHCP master server;
2-5 byte (taking the 8-39 bit) with the IP address of DHCP master server or DHCP from the IP address of server; When the 1st byte be designated 0 the time; IP address with DHCP from server, when the 1st byte be designated 1 the time, with the IP address of DHCP master server;
The 6th byte (taking the 40-47 bit) is switched sign with the principal and subordinate; This principal and subordinate is switched sign and is used to indicate the DHCP relay device whether immediately that the 1st byte is indicated server switches to operating state; 1 expression is switched immediately; 0 expression is not switched immediately, promptly when the Dynamic Host Configuration Protocol server of work at present breaks down, carries out and switches.
Master-slave switching method according to the foregoing description; Through from the dhcp response message, learning IP address and the switchover policy of DHCP from server by the DHCP relay device; Carrying out the principal and subordinate according to switchover policy switches; Because this principal and subordinate's handover operation is judged by the DHCP relay device and carry out the DHCP relay device sends the DHCP request message to which server, then which server is a workspace server; So the situation that DHCP master server and DHCP work from server simultaneously can not appear, thus avoided because of DHCP master server and DHCP be that dhcp client duplicate allocation IP causes the chaotic problem of IP from server.
Further; In the master-slave switching method of the foregoing description; If said DHCP relay device is through resolving said dhcp response message; Obtain DHCP and switch sign, then switch the pairing switchover policy of sign and carry out said DHCP master server and said DHCP and specifically comprise from the switching of the principal and subordinate between the server according to said principal and subordinate from the IP address and the principal and subordinate of server:
If said DHCP relay device is through resolving said dhcp response message; Obtaining DHCP carries out first principal and subordinate of switching when unusual and switches sign with being used to indicate from the IP address of server; Then take place when unusual when detecting the link know between said DHCP master server or self and the said DHCP master server, according to said DHCP from the IP address of server to said DHCP from server forwards DHCP request message.
Particularly, in the dhcp response message that the DHCP master server sends, the option field is set to usually: the 1st byte is the IP address (for example be 1.1.1.1) of 0, the 2-5 byte with DHCP from server, and the 6th byte is 0.
The DHCP relay device is resolved the dhcp response message; Switch sign if from the option field of dhcp response message, get access to DHCP from the IP address of server with for the principal and subordinate of " 0 "; Then write down the IP address of DHCP, and before the link occurs fault that does not detect between DHCP master server or self and the said DHCP master server, continue and to transmit to the DHCP master server from the DHCP request message that dhcp client receives from server.
More particularly, the first example signaling diagram of Fig. 4 for communicating by letter between DHCP relay device in the master-slave switching method of the present invention and the master and slave server of DHCP.As shown in Figure 4, may further comprise the steps:
Step S401, the DHCP relay device sends the DHCP request message to the DHCP master server;
Step S402, when sending the DHCP request message, the DHCP relay device is at local open detection timer;
Step S403 if behind the detection timer expiry of being opened, do not receive the dhcp response message that the DHCP master server returns, then sends the DHCP request message to the DHCP master server again;
Step S404 restarts the detection timer;
Step S405; If after detecting timer expiry; Do not receive the dhcp response message that the DHCP master server returns yet; Then break off and the communicating by letter and DHCP is switched to operating state from server of DHCP master server, that is: according to the IP address of DHCP from server, with the DHCP request message that does not receive response to DHCP from server forwards;
Step S406, DHCP handles this DHCP request message from server, and returns the dhcp response message to the DHCP relay device.
So far, having accomplished the operating state of DHCP master server to DHCP from server switches.
Master-slave switching method according to the foregoing description; Through from the dhcp response message, learning DHCP by the DHCP relay device from the IP address of server and the switchover policy that the principal and subordinate is switched takes place to carry out when unusual; State to the DHCP master server in the process that communicates with the DHCP master server detects; And when the link occurs fault that detects between DHCP master server or self and the DHCP master server; According to the DHCP that learns from the IP address switchover of server for to communicate from server with DHCP; So that DHCP is the dhcp client distributing IP address of request access network from server, the Dynamic Host Configuration Protocol server that is about to work in the network is switched to from server by master server.This principal and subordinate's handover operation is judged by the DHCP relay device and is carried out; The DHCP relay device sends the DHCP request message to which server; Then which server is a workspace server; So the situation that DHCP master server and DHCP work from server simultaneously can not appear, thus avoided because of DHCP master server and DHCP be that dhcp client duplicate allocation IP causes the chaotic problem of IP from server.
Further; In the master-slave switching method of the foregoing description; If the DHCP relay device is through resolving said dhcp response message; Obtain DHCP and switch sign, then switch the pairing switchover policy of sign and carry out said DHCP master server and said DHCP and specifically comprise from the switching of the principal and subordinate between the server according to said principal and subordinate from the IP address and the principal and subordinate of server:
If said DHCP relay device is through resolving said dhcp response message; Obtain DHCP and switch sign with second principal and subordinate who is used to indicate execution immediately to switch from the IP address of server; Then when receiving the DHCP request message that dhcp client sends once more, according to said DHCP from the IP address of server to said DHCP from server forwards DHCP request message.
Particularly, the DHCP master server also as required second principal and subordinate in the dhcp response message switch sign and be set to 1.For example; When the DHCP master server is communicated by letter with a plurality of DHCP relay devices, if the DHCP relay device quantity of being communicated by letter has surpassed its load, then for guaranteeing operate as normal; The DHCP master server can be in returning to the dhcp response message of a part of DHCP relay device; Second principal and subordinate is switched sign and is set to 1, so that these DHCP relay devices need transmit the DHCP request message once more the time, directly send from server to DHCP.
Further, in the master-slave switching method of the foregoing description, after server forwards DHCP request message, also comprise to said DHCP from the IP address of server according to said DHCP:
If said DHCP relay device is through resolving said dhcp response message; Sign is switched with second principal and subordinate who is used to indicate execution immediately to switch in the IP address that obtains the DHCP master server; Then when receiving the DHCP request message of dhcp client transmission once more, transmit the DHCP request message to said DHCP master server.
Particularly, the second example signaling diagram of Fig. 5 for communicating by letter between DHCP relay device in the master-slave switching method of the present invention and the master and slave server of DHCP.As shown in Figure 5, may further comprise the steps:
Step S501, the DHCP relay device switches to DHCP with the server of work at present behind server by the DHCP master server, and DHCP returns the dhcp response message from the DHCP request message that server response DHCP relay device sends;
Step S502; To detect the service ability of DHCP master server normal if DHCP is equipped with passage from server through the heat between itself and the DHCP master server; Do not break down, then DHCP when returning the dhcp response message, starts the local switching timer that is provided with from server; Particularly; Because DHCP detects the DHCP master server from server and does not break down; But can't carry out proper communication between DHCP relay device and the DHCP master server, then possibly be because being connected disconnection and causing can't carrying out proper communication between DHCP relay device and the DHCP master server between DHCP relay device and the DHCP master server.Therefore DHCP is provided with a switching timer from server, with when this switch overtime, indicates DHCP relay to think highly of newly the DHCP request message to be issued the DHCP master server and handles;
Step S503, DHCP from server switching timer then before, continue that the DHCP relay device is transmitted the DHCP request message that comes and handle; When the switching timer time then; Hope the DHCP relay device make a try with the DHCP master server between link do not recover; Then carry out principal and subordinate's information synchronization, give the DHCP master server synchronously the address allocation information that has handled this locality, consistent from the information on the server to guarantee the DHCP master server with DHCP; Promptly when follow-up all DHCP request messages are handled by the DHCP master server, but the integrality of Guarantee Status machine still;
Step S504; DHCP from server to switching timer then the back to first dhcp response message that the DHCP relay device returns; The option field is set to: the 1st byte is the IP address (for example be 1.1.1.2) of 1, the 2-5 byte with the DHCP master server, and the 6th byte is 1;
Step S505, the DHCP relay device is resolved this dhcp response message, gets access to the IP address of DHCP master server and switches sign for the principal and subordinate of " 1 ", then when carrying out the forwarding of next DHCP request message, transmits to the DHCP master server once more.If linking between DHCP relay device and the DHCP master server recovers, then the DHCP master server switches back operating state again, carries out follow-up IP address assignment; If not linking yet between DHCP relay device and the DHCP master server recovers, then DHCP relay is thought highly of the capable flow process shown in Figure 4 of retry.
Master-slave switching method according to the foregoing description; Through DHCP relay device and DHCP from the information interaction between the server; Can between DHCP relay device and DHCP master server, cause under the temporary transient disabled situation of DHCP master server owing to linking to break off; Carry out after a period of time handles for the DHCP master server from server generation by DHCP; The DHCP relay device detect between current DHCP relay device and the DHCP master server link whether available, but and when the time spent, the server of working in the network system is switched back the DHCP master server by DHCP from server.
In addition, in above-mentioned flow process shown in Figure 5, being equipped with passage from server through heat with DHCP, to detect the DHCP master server normally be that example describes.But in practical application, also possibly have other situation, for example: DHCP is equipped with passage from server through heat and detects the DHCP master server and break down, or because heat is equipped with channel failure, makes DHCP can't detect the state of DHCP master server etc. from server.To these situation; DHCP need not to start switching timer from server; But continue heat is equipped with passage and the DHCP master server is surveyed; And the DHCP relay device is transmitted the DHCP request message that comes handle, only ought detect the DHCP master server just often, communicate through dhcp response message indication DHCP relay device and DHCP master server.
Fig. 6 is the structural representation of the network equipment of the present invention.As shown in Figure 6, this network equipment comprises:
Principal and subordinate's handover module 62; Be used for if through resolving said dhcp response message; Obtain DHCP and switch sign, then switch the pairing switchover policy of sign and carry out said DHCP master server and said DHCP switches from the principal and subordinate between the server according to said principal and subordinate from the IP address and the principal and subordinate of server.。
The network equipment of the foregoing description for example is the DHCP relay device of the master-slave switching method that is used to carry out the foregoing description, and it specifically can be router in the network or switch.
The flow process that the network equipment of the foregoing description is carried out principal and subordinate's switching is identical with the master-slave switching method of the foregoing description, so locate to repeat no more.
The network equipment according to the foregoing description; Through from the dhcp response message, learning IP address and the switchover policy of DHCP from server; Carrying out the principal and subordinate according to switchover policy switches; Because this principal and subordinate's handover operation is judged by the DHCP relay device and carry out the network equipment sends the DHCP request message to which server, then which server is a workspace server; So the situation that DHCP master server and DHCP work from server simultaneously can not appear, thus avoided because of DHCP master server and DHCP be that dhcp client duplicate allocation IP causes the chaotic problem of IP from server.
Further; In the master-slave switching method of the foregoing description; If principal and subordinate's handover module also is used for through resolving said dhcp response message; Obtain DHCP and carry out first principal and subordinate of switching when unusual and switch sign with being used to indicate, then know link between said DHCP master server or self and the said DHCP master server and take place when unusual when detection from the IP address of server, according to said DHCP from the IP address of server to said DHCP from server forwards DHCP request message.
The network equipment according to the foregoing description; Through study DHCP from the dhcp response message from the IP address of server and the switchover policy that the principal and subordinate is switched takes place to carry out when unusual; State to the DHCP master server in the process that communicates with the DHCP master server detects; And when the link occurs fault that detects between DHCP master server or self and the DHCP master server; According to the DHCP that learns from the IP address switchover of server for to communicate from server with DHCP so that DHCP is from the dhcp client distributing IP address of server for the request access network, the Dynamic Host Configuration Protocol server that is about to work in the network is switched to from server by master server.This principal and subordinate's handover operation is judged by the network equipment and is carried out; The network equipment sends the DHCP request message to which server; Then which server is a workspace server; So the situation that DHCP master server and DHCP work from server simultaneously can not appear, thus avoided because of DHCP master server and DHCP be that dhcp client duplicate allocation IP causes the chaotic problem of IP from server.
Further; In the network equipment of the foregoing description; If said principal and subordinate's handover module also is used for through resolving said dhcp response message; Obtain DHCP and carry out second principal and subordinate of switching immediately and switch sign with being used to indicate from the IP address of server, then when receiving the DHCP request message that dhcp client sends once more, according to said DHCP from the IP address of server to said DHCP from server forwards DHCP request message.
Further; In the network equipment of the foregoing description; If said principal and subordinate's handover module also is used for through resolving said dhcp response message; Sign is switched with second principal and subordinate who is used to indicate execution immediately to switch in the IP address that obtains the DHCP master server, then when receiving the DHCP request message of dhcp client transmission once more, transmits the DHCP request message to said DHCP master server.
The network equipment according to the foregoing description; Through and DHCP from the information interaction between the server; Can between the network equipment and DHCP master server, cause under the temporary transient disabled situation of DHCP master server owing to linking to break off; Carry out after a period of time handles for the DHCP master server from server generation by DHCP; Informing network equipment (for example for DHCP relay device) detect once more self with the DHCP master server between link whether available, but and ought the time spent, the server of working in the network system is switched back the DHCP master server by DHCP from server.
Further, in the network equipment of the foregoing description, said principal and subordinate's handover module also is used for sending the DHCP request message to said DHCP master server, and the detection starting timer; If behind said detection timer expiry, do not receive the dhcp response message that said DHCP master server returns, then retransmit said DHCP request message, and restart said detection timer; If behind the detection timer expiry that restarts, do not receive the dhcp response message that said DHCP master server returns yet, then according to said DHCP from the IP address of server to said DHCP from the said DHCP request message of server forwards.
Fig. 7 is the schematic flow sheet of another master-slave switching method of the present invention.As shown in Figure 7, this master-slave switching method comprises:
Step S701, Dynamic Host Configuration Protocol server receives the DHCP request message that the DHCP relay device is transmitted;
Step S702; Dynamic Host Configuration Protocol server is according to said DHCP request message; Return the dhcp response message to said DHCP relay device; Wherein said dhcp response message carries the IP address and the principal and subordinate that back up Dynamic Host Configuration Protocol server and switches sign, and the pairing switchover policy of sign is carried out said DHCP master server and said DHCP switches from the principal and subordinate between the server so that said DHCP relay device switches according to said principal and subordinate.
The master-slave switching method of the foregoing description also can be applicable to topological structure shown in Figure 2.Wherein, Dynamic Host Configuration Protocol server can for the DHCP master server among Fig. 2 or DHCP from server, correspondingly, when the Dynamic Host Configuration Protocol server in the foregoing description is the DHCP master server, then backs up Dynamic Host Configuration Protocol server and be DHCP from server; When the Dynamic Host Configuration Protocol server in the foregoing description is DHCP during from server, then back up Dynamic Host Configuration Protocol server and be the DHCP master server.
The concrete realization flow of the master-slave switching method of the foregoing description is identical with flow process shown in Figure 5 with Fig. 4, so locate to repeat no more.
Master-slave switching method according to the foregoing description; Because Dynamic Host Configuration Protocol server provides the IP address and the switchover policy of backup Dynamic Host Configuration Protocol server in the response message that returns to the DHCP relay device, make the DHCP relay device to switch sign and carry out corresponding principal and subordinate's switching according to the principal and subordinate.Because the DHCP relay device sends the DHCP request message to which server; Then which server is a workspace server; So the situation that DHCP master server and DHCP work from server simultaneously can not appear, thus avoided because of DHCP master server and DHCP be that dhcp client duplicate allocation IP causes the chaotic problem of IP from server.
Further; In the master-slave switching method of the foregoing description; Said principal and subordinate is switched to be designated to be used to indicate and is carried out first principal and subordinate of switching when unusual and switch sign; So that if said DHCP relay device is through resolving said dhcp response message; The IP address that obtains the backup Dynamic Host Configuration Protocol server is carried out first principal and subordinate of switching when unusual and is switched sign with being used to indicate, then take place when unusual when detecting the link of knowing between Dynamic Host Configuration Protocol server or self and the said Dynamic Host Configuration Protocol server, according to the IP address of said backup Dynamic Host Configuration Protocol server to said backup Dynamic Host Configuration Protocol server forwarding DHCP request message.
Further, in the master-slave switching method of the foregoing description, the DHCP request message that said Dynamic Host Configuration Protocol server receives the forwarding of DHCP relay device also comprises afterwards:
Said Dynamic Host Configuration Protocol server carries out state-detection to said backup Dynamic Host Configuration Protocol server;
If detect and know that said backup Dynamic Host Configuration Protocol server is normal; Then start the switching timer that presets; And when said switching timer then after; Return the IP address that carries the backup Dynamic Host Configuration Protocol server to said DHCP relay device and carry out the dhcp response message that second principal and subordinate of switching at sign immediately, so that said DHCP relay device is transmitted the DHCP request message to said backup Dynamic Host Configuration Protocol server when receiving the DHCP request message of dhcp client transmission once more with being used to indicate.
According to the master-slave switching method of the foregoing description,, can be the principal and subordinate on the one hand and switch the availability of back system and provide safeguard through the backup Dynamic Host Configuration Protocol server being carried out state-detection by the Dynamic Host Configuration Protocol server of work at present; On the other hand, be DHCP during at current Dynamic Host Configuration Protocol server from server, also can after work a period of time, switch back again at alternative DHCP master server by the execution work of DHCP master server.
Fig. 8 is the structural representation of Dynamic Host Configuration Protocol server of the present invention.As shown in Figure 8, this Dynamic Host Configuration Protocol server comprises:
Receiver module 81 is used to receive the DHCP request message that the DHCP relay device is transmitted;
Respond module 82; Be used for according to said DHCP request message; Return the dhcp response message to said DHCP relay device; Wherein said dhcp response message carries the IP address and the principal and subordinate that back up Dynamic Host Configuration Protocol server and switches sign, and the pairing switchover policy of sign is carried out said DHCP master server and said DHCP switches from the principal and subordinate between the server so that said DHCP relay device switches according to said principal and subordinate.
The flow process that the Dynamic Host Configuration Protocol server of the foregoing description is carried out principal and subordinate's switching is identical with the master-slave switching method of the foregoing description, so locate to repeat no more.
According to the Dynamic Host Configuration Protocol server of the foregoing description,, make the DHCP relay device to switch sign and carry out corresponding principal and subordinate's switching according to the principal and subordinate because the IP address and the switchover policy of backup Dynamic Host Configuration Protocol server are provided in the response message that returns to the DHCP relay device.Because the DHCP relay device sends the DHCP request message to which server; Then which server is a workspace server; So the situation that DHCP master server and DHCP work from server simultaneously can not appear, thus avoided because of DHCP master server and DHCP be that dhcp client duplicate allocation IP causes the chaotic problem of IP from server.
Further; In the Dynamic Host Configuration Protocol server of the foregoing description; Said principal and subordinate is switched sign and is included as to be used to indicate and carries out first principal and subordinate of switching when unusual and switch sign; So that if said DHCP relay device is through resolving said dhcp response message; The IP address that obtains the backup Dynamic Host Configuration Protocol server is carried out first principal and subordinate of switching when unusual and is switched sign with being used to indicate, then take place when unusual when detecting the link of knowing between Dynamic Host Configuration Protocol server or self and the said Dynamic Host Configuration Protocol server, according to the IP address of said backup Dynamic Host Configuration Protocol server to said backup Dynamic Host Configuration Protocol server forwarding DHCP request message.
Further, in the Dynamic Host Configuration Protocol server of the foregoing description, also comprise:
Backup Dynamic Host Configuration Protocol server state detection module is used for said backup Dynamic Host Configuration Protocol server is carried out state-detection; Correspondingly; Said respond module also is used for knowing that said backup Dynamic Host Configuration Protocol server is normal if detect; Then start switching timer, and when said switching timer then after, return IP address and the dhcp response message that said second principal and subordinate is switched sign that carries the backup Dynamic Host Configuration Protocol server to said DHCP relay device; So that said DHCP relay device is transmitted the DHCP request message to said backup Dynamic Host Configuration Protocol server when receiving the DHCP request message of dhcp client transmission once more.
According to the Dynamic Host Configuration Protocol server of the foregoing description,, can be on the one hand the principal and subordinate and switch the availability of back system and provide safeguard through the backup Dynamic Host Configuration Protocol server is carried out state-detection; On the other hand, be DHCP during at current Dynamic Host Configuration Protocol server from server, also can after work a period of time, switch back again at alternative DHCP master server by the execution work of DHCP master server.
What should explain at last is: above embodiment is only in order to explaining technical scheme of the present invention, but not to its restriction; Although with reference to previous embodiment the present invention has been carried out detailed explanation, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these are revised or replacement, do not make the scope of the essence disengaging various embodiments of the present invention technical scheme of relevant art scheme.
Claims (16)
1. a master-slave switching method is characterized in that, comprising:
The dynamic host configuration protocol DHCP repeater is transmitted the DHCP request message to the DHCP master server, and receives the dhcp response message that said DHCP master server returns;
If said DHCP relay device is through resolving said dhcp response message; Obtain DHCP and switch sign, then switch the pairing switchover policy of sign and carry out said DHCP master server and said DHCP switches from the principal and subordinate between the server according to said principal and subordinate from the IP address and the principal and subordinate of server.
2. master-slave switching method according to claim 1; It is characterized in that; If said DHCP relay device is through resolving said dhcp response message; Obtain DHCP and switch sign, then switch the pairing switchover policy of sign and carry out said DHCP master server and said DHCP and specifically comprise from the switching of the principal and subordinate between the server according to said principal and subordinate from the IP address and the principal and subordinate of server:
If said DHCP relay device is through resolving said dhcp response message; Obtaining DHCP carries out first principal and subordinate of switching when unusual and switches sign with being used to indicate from the IP address of server; Then take place when unusual when detecting the link know between said DHCP master server or self and the said DHCP master server, according to said DHCP from the IP address of server to said DHCP from server forwards DHCP request message.
3. master-slave switching method according to claim 1; It is characterized in that; If said DHCP relay device is through resolving said dhcp response message; Obtain DHCP and switch sign, then switch the pairing switchover policy of sign and carry out said DHCP master server and said DHCP and specifically comprise from the switching of the principal and subordinate between the server according to said principal and subordinate from the IP address and the principal and subordinate of server:
If said DHCP relay device is through resolving said dhcp response message; Obtain DHCP and switch sign with second principal and subordinate who is used to indicate execution immediately to switch from the IP address of server; Then when receiving the DHCP request message that dhcp client sends once more, according to said DHCP from the IP address of server to said DHCP from server forwards DHCP request message.
4. according to claim 2 or 3 described master-slave switching methods, it is characterized in that, after server forwards DHCP request message, also comprise to said DHCP from the IP address of server according to said DHCP:
If said DHCP relay device is through resolving the dhcp response message that said DHCP returns from server; Sign is switched with second principal and subordinate who is used to indicate execution immediately to switch in the IP address that obtains the DHCP master server; Then when receiving the DHCP request message of dhcp client transmission once more, transmit the DHCP request message to said DHCP master server.
5. master-slave switching method according to claim 2; It is characterized in that; Saidly take place specifically to comprise from server forwards DHCP request message to said DHCP from the IP address of server according to said DHCP when unusual when detecting the link know between said DHCP master server or self and the said DHCP master server:
Said DHCP relay device sends the DHCP request message to said DHCP master server, and the detection starting timer;
Said DHCP relay device is then retransmitted said DHCP request message, and is restarted said detection timer if before said detection timer expiry, do not receive the dhcp response message that said DHCP master server returns;
Said DHCP relay device is not if receive the dhcp response message that said DHCP master server returns yet before the detection timer expiry that restarts, then according to said DHCP from the IP address of server to said DHCP from the said DHCP request message of server forwards.
6. a network equipment is characterized in that, comprising:
Transceiver module is used for transmitting the DHCP request message to the DHCP master server, and receives the dhcp response message that said DHCP master server returns;
Principal and subordinate's handover module; Be used for if through resolving said dhcp response message; Obtain DHCP and switch sign, then switch the pairing switchover policy of sign and carry out said DHCP master server and said DHCP switches from the principal and subordinate between the server according to said principal and subordinate from the IP address and the principal and subordinate of server.
7. the network equipment according to claim 6; It is characterized in that; If said principal and subordinate's handover module also is used for through resolving said dhcp response message; Obtain DHCP and carry out first principal and subordinate of switching when unusual and switch sign with being used to indicate, then know link between said DHCP master server or self and the said DHCP master server and take place when unusual when detection from the IP address of server, according to said DHCP from the IP address of server to said DHCP from server forwards DHCP request message.
8. the network equipment according to claim 6; It is characterized in that; If said principal and subordinate's handover module also is used for through resolving said dhcp response message; Obtain DHCP and carry out second principal and subordinate of switching immediately and switch sign with being used to indicate from the IP address of server, then when receiving the DHCP request message that dhcp client sends once more, according to said DHCP from the IP address of server to said DHCP from server forwards DHCP request message.
9. according to the claim 7 or the 8 described network equipments; It is characterized in that; If said principal and subordinate's handover module also is used for through resolving the dhcp response message that said DHCP returns from server; Sign is switched with second principal and subordinate who is used to indicate execution immediately to switch in the IP address that obtains the DHCP master server, then when receiving the DHCP request message of dhcp client transmission once more, transmits the DHCP request message to said DHCP master server.
10. according to the claim 7 or the 8 described network equipments, it is characterized in that said principal and subordinate's handover module also is used for sending the DHCP request message to said DHCP master server, and the detection starting timer; If before said detection timer expiry, do not receive the dhcp response message that said DHCP master server returns, then retransmit said DHCP request message, and restart said detection timer; If before the detection timer expiry that restarts, do not receive the dhcp response message that said DHCP master server returns yet, then according to said DHCP from the IP address of server to said DHCP from the said DHCP request message of server forwards.
11. a master-slave switching method is characterized in that, comprising:
Dynamic Host Configuration Protocol server receives the DHCP request message that the DHCP relay device is transmitted;
Said Dynamic Host Configuration Protocol server is according to said DHCP request message; Return the dhcp response message to said DHCP relay device; Wherein said dhcp response message carries the IP address and the principal and subordinate that back up Dynamic Host Configuration Protocol server and switches sign, and the pairing switchover policy of sign is carried out said DHCP master server and said DHCP switches from the principal and subordinate between the server so that said DHCP relay device switches according to said principal and subordinate.
12. master-slave switching method according to claim 11; It is characterized in that; Said principal and subordinate is switched to be designated to be used to indicate and is carried out first principal and subordinate of switching when unusual and switch sign; So that if said DHCP relay device is through resolving said dhcp response message; The IP address that obtains the backup Dynamic Host Configuration Protocol server is carried out first principal and subordinate of switching when unusual and is switched sign with being used to indicate, then take place when unusual when detecting the link of knowing between Dynamic Host Configuration Protocol server or self and the said Dynamic Host Configuration Protocol server, according to the IP address of said backup Dynamic Host Configuration Protocol server to said backup Dynamic Host Configuration Protocol server forwarding DHCP request message.
13. master-slave switching method according to claim 11 is characterized in that, the DHCP request message that said Dynamic Host Configuration Protocol server receives the forwarding of DHCP relay device also comprises afterwards:
Said Dynamic Host Configuration Protocol server carries out state-detection to said backup Dynamic Host Configuration Protocol server;
If detect and know that said backup Dynamic Host Configuration Protocol server is normal; Then start the switching timer that presets; And when said switching timer then after; Return the IP address that carries the backup Dynamic Host Configuration Protocol server to said DHCP relay device and carry out the dhcp response message that second principal and subordinate of switching at sign immediately, so that said DHCP relay device is transmitted the DHCP request message to said backup Dynamic Host Configuration Protocol server when receiving the DHCP request message of dhcp client transmission once more with being used to indicate.
14. a Dynamic Host Configuration Protocol server is characterized in that, comprising:
Receiver module is used to receive the DHCP request message that the DHCP relay device is transmitted;
Respond module; Be used for according to said DHCP request message; Return the dhcp response message to said DHCP relay device; Wherein said dhcp response message carries the IP address and the principal and subordinate that back up Dynamic Host Configuration Protocol server and switches sign, and the pairing switchover policy of sign is carried out said DHCP master server and said DHCP switches from the principal and subordinate between the server so that said DHCP relay device switches according to said principal and subordinate.
15. Dynamic Host Configuration Protocol server according to claim 14; It is characterized in that; Said principal and subordinate is switched sign and is included as to be used to indicate and carries out first principal and subordinate of switching when unusual and switch sign; So that if said DHCP relay device is through resolving said dhcp response message; The IP address that obtains the backup Dynamic Host Configuration Protocol server is carried out first principal and subordinate of switching when unusual and is switched sign with being used to indicate, then take place when unusual when detecting the link of knowing between Dynamic Host Configuration Protocol server or self and the said Dynamic Host Configuration Protocol server, according to the IP address of said backup Dynamic Host Configuration Protocol server to said backup Dynamic Host Configuration Protocol server forwarding DHCP request message.
16. Dynamic Host Configuration Protocol server according to claim 14 is characterized in that, also comprises:
Backup Dynamic Host Configuration Protocol server state detection module is used for said backup Dynamic Host Configuration Protocol server is carried out state-detection; Correspondingly; Said respond module also is used for knowing that said backup Dynamic Host Configuration Protocol server is normal if detect; Then start the switching timer that presets; And when said switching timer then after; Return the IP address that carries the backup Dynamic Host Configuration Protocol server to said DHCP relay device and carry out the dhcp response message that second principal and subordinate of switching at sign immediately, so that said DHCP relay device is transmitted the DHCP request message to said backup Dynamic Host Configuration Protocol server when receiving the DHCP request message of dhcp client transmission once more with being used to indicate.
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Address after: Cangshan District of Fuzhou City, Fujian province 350002 Jinshan Road No. 618 Garden State Industrial Park building 19# Patentee after: RUIJIE NETWORKS CO., LTD. Address before: Cangshan District of Fuzhou City, Fujian province 350002 Jinshan Road No. 618 Garden State Industrial Park building 19# Patentee before: Fujian Xingwangruijie Network Co., Ltd. |