CN104202204A - Clock synchronous control method, device and system based on SNTP - Google Patents
Clock synchronous control method, device and system based on SNTP Download PDFInfo
- Publication number
- CN104202204A CN104202204A CN201410505363.0A CN201410505363A CN104202204A CN 104202204 A CN104202204 A CN 104202204A CN 201410505363 A CN201410505363 A CN 201410505363A CN 104202204 A CN104202204 A CN 104202204A
- Authority
- CN
- China
- Prior art keywords
- clock synchronous
- address
- sntp
- destination server
- client
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Synchronisation In Digital Transmission Systems (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
The invention discloses a clock synchronous control method, device and system based on SNTP. The method comprises the following steps: IP address of at least one clock synchronous server is acquired by a clock synchronous client side and the IP address is saved in an address pool; then, according to preset IP address assignment principle of the clock synchronous server, one IP address is selected from the address pool to serve as the IP address of a target server; then, according to the selected IP address, SNTP unicast request message is sent to the target server and SNTP respond message sent by the target server is received; lastly, the time deviation between the clock synchronous client side and the target server is calculated and the clock synchronous processing is realized according to the time deviation. Through the adoption of the method, the manner that the IP address of the clock synchronous server is dynamically discovered is adopted, so that the clock synchronous reliability can be guaranteed, the complexity of the clock synchronous control system and workload of later period maintenance can be reduced.
Description
Technical field
The present invention relates to industrial automatic control field, particularly a kind of clock synchronization control method, Apparatus and system based on SNTP.
Background technology
In industrial automatic control field, control system generally comprises active station, control station, collecting device etc.Wherein, active station is the equipment for carrying out information exchange with user, plays the effect of centralized operation and supervision in whole production process.Control station carries out continuous control, controls and sequential control in batches production process, and equipment that can independent operating.In this control system, active station and control station need strict clock synchronous can guarantee the normal operation of whole system, therefore usually active station and control station unification are called to clock synchronous client, and by for providing the equipment of clock source to be referred to as clock synchronous server.
In the prior art, control system is normally based on SNTP (Simple Network Time Protocol, SNTP) unicast mode in, need to be by the mode of configuration download or configuration issue in all clock synchronous clients, the IP address of pre-configured clock synchronous server, then clock synchronous client operation configuration by unicast mode and time synchronized server carry out to time, just can realize the clock synchronous of whole system.But often can there is following problem in this mode:
The first, when the IP address of clock synchronization server changes, or when clock synchronization server cannot normally be worked, will cause whole system cannot realize clock synchronous.
The second, because clock synchronous client is by the IP address of static configuration clock synchronous server, this static configuration mode cannot realize the redundancy of clock synchronous server and select, thereby causes the reliability of system not high.
Summary of the invention
In view of this, the object of the present invention is to provide clock synchronization control method, Apparatus and system based on SNTP, to realize the reliability of client clock synchronous and the object of accuracy in control system.
For achieving the above object, the invention provides following technical scheme:
First aspect, the invention provides a kind of clock synchronization control method based on SNTP, comprising:
Clock synchronous client is obtained the IP address of at least one clock synchronous server, and IP address is kept in address pool;
Described clock synchronous client, according to default clock synchronous server ip address distribution principle, selects an IP address as the IP address of destination server from address pool;
Described clock synchronous client sends SNTP unitcast request message according to selected IP address to destination server, receives the SNTP response message that described destination server sends;
Described clock synchronous client, according to transmitting time and the time of reception of SNTP response message time of the timestamp of the timestamp in described SNTP unitcast request message, SNTP response message, SNTP unitcast request message, is calculated the time deviation between described clock synchronous client and described destination server;
Described clock synchronous client realizes clock synchronous according to described time deviation and processes.
Preferably, the process that described clock synchronous client is obtained the IP address of at least one clock synchronous server comprises:
Described clock synchronous client is intercepted the SNTP broadcast synchronization message that clock synchronous server sends, the IP address that obtains clock synchronous server from this message; And/or
Described clock synchronous client sends SNTP broadcast query message, the response message that receive clock synchronization server sends, the IP address that obtains clock synchronous server from described response message.
Preferably, described clock synchronous client, according to default clock synchronous server ip address distribution principle, selects an IP address to comprise as the process of the IP address of destination server from address pool:
Described clock synchronous client, according to the principle of domain addresses minimum, selects the IP address of domain addresses minimum as the IP address of destination server from address pool; Or,
Described clock synchronous client, according to the principle of domain addresses maximum, selects the IP address of domain addresses maximum as the IP address of destination server from address pool; Or,
Described clock synchronous client, according to the principle of device address minimum, selects the IP address of device address minimum as the IP address of destination server from address pool; Or,
Described clock synchronous client, according to the principle of device address maximum, selects the IP address of device address maximum as the IP address of destination server from address pool.
Preferably, the step that described clock synchronous client realizes clock synchronous processing according to described time deviation comprises:
When described clock synchronous client judges that described time deviation is greater than threshold value, or time of described clock synchronous client while being less than the time of destination server, described clock synchronous client is adjusted self clock based on described time deviation;
When the time of described clock synchronous client is greater than the time of destination server, described clock synchronous client operation suspension clock is until be synchronized to the time of destination server.
Preferably, after sending SNTP unitcast request message according to selected IP address to destination server in described clock synchronous client, described method also comprises:
Whether described clock synchronous client control receives the SNTP response message that described destination server sends in Preset Time; If so, carry out the operation of the time deviation between the described clock synchronous client of described calculating and described destination server;
Otherwise, described clock synchronous client is first deleted selected IP address scheduler pond from described address pool, again carry out according to default clock synchronous server ip address distribution principle, from address pool, select an IP address as the operation of the IP address of destination server.
Preferably, when described clock synchronous client does not receive the SNTP response message of described destination server transmission in Preset Time, described method comprises:
Described clock synchronous client sends a warning message, and described warning information is used for notifying destination server described in operating personnel to break down.
Preferably, described clock synchronous client sends SNTP unitcast request message according to selected IP address to destination server, and the step that receives the SNTP response message of described destination server transmission comprises:
Described clock synchronous client sends SNTP unitcast request message according to predetermined period to described destination server, and sends the SNTP unitcast request message of preset number at every turn, receives the SNTP response message that described destination server sends;
Described clock synchronous client realizes clock synchronous according to described time deviation and processes and specifically to comprise:
Described clock synchronous client is removed maximum and minimum value from a plurality of time deviations, asks for the arithmetic mean of remaining time deviation, utilizes this arithmetic mean synchronised clock.
Preferably, when a plurality of clock synchronous clients need clock synchronous, each clock synchronous client time of staggering sends SNTP unitcast request message.
Second aspect, the present invention also provides a kind of clock synchronous control device based on SNTP, comprising:
Address acquisition unit, the IP address that obtains at least one clock synchronous server for controlling clock synchronous client, and IP address is kept in address pool;
Destination server selected cell for controlling described clock synchronous client according to default clock synchronous server ip address distribution principle, selects an IP address as the IP address of destination server from address pool;
Synchronization request unit, sends SNTP unitcast request message according to selected IP address to destination server for controlling described clock synchronous client, receives the SNTP response message that described destination server sends;
Time deviation computing unit, for controlling described clock synchronous client according to transmitting time and the time of reception of SNTP response message time of the timestamp of the timestamp of described SNTP unitcast request message, SNTP response message, SNTP unitcast request message, calculate the time deviation between described clock synchronous client and described destination server;
Clock synchronous unit, realizes clock synchronous processing for controlling described clock synchronous client according to described time deviation.
Preferably, described address acquisition unit comprises:
The first address acquisition subelement, intercepts the SNTP broadcast synchronization message that clock synchronous server sends, the IP address that obtains clock synchronous server from this message for controlling described clock synchronous client; And/or
The second address acquisition subelement, sends SNTP broadcast query message, the response message that receive clock synchronization server sends, the IP address that obtains clock synchronous server from described response message for controlling described clock synchronous client.
Preferably, described destination server selected cell, specifically for controlling described clock synchronous client according to the principle of domain addresses minimum, selects the IP address of domain addresses minimum as the IP address of destination server from address pool; Or,
Described destination server selected cell, specifically for controlling described clock synchronous client according to the principle of domain addresses maximum, selects the IP address of domain addresses maximum as the IP address of destination server from address pool; Or,
Described destination server selected cell, specifically for controlling described clock synchronous client according to the principle of device address minimum, selects the IP address of device address minimum as the IP address of destination server from address pool; Or,
Described destination server selected cell, specifically for controlling described clock synchronous client according to the principle of device address maximum, selects the IP address of device address maximum as the IP address of destination server from address pool.
Preferably, described clock synchronous unit comprises:
Adjust clock subelement, for when described clock synchronous client judges that described time deviation is greater than threshold value, or the time of described clock synchronous client, while being less than the time of destination server, being controlled described clock synchronous client and adjusts self clock based on described time deviation;
Suspend clock subelement, while being greater than the time of destination server for the time when described clock synchronous client, control described clock synchronous client operation suspension clock until be synchronized to the time of destination server.
Preferably, described device also comprises:
Whether monitoring unit, receive for controlling described clock synchronous client control the SNTP response message that described destination server sends in Preset Time; If so, deviation computing unit is carried out corresponding operation the triggered time; Otherwise, trigger address pool management unit;
Described address pool management unit, be used for controlling described clock synchronous client and first from described address pool, delete selected IP address, again carry out according to default clock synchronous server ip address distribution principle, from address pool, select an IP address as the operation of the IP address of destination server.
Preferably, described device also comprises:
Alarm Unit, be used for when described clock synchronous client does not receive the SNTP response message of described destination server transmission in Preset Time, control described clock synchronous client and send a warning message, described warning information is used for notifying destination server described in operating personnel to break down.
Preferably, described synchronization request unit sends SNTP unitcast request message according to predetermined period to described destination server specifically for controlling described clock synchronous client, and send the SNTP unitcast request message of preset number at every turn, receive the SNTP response message that described destination server sends;
Maximum and minimum value are removed specifically for controlling described clock synchronous client in described clock synchronous unit from a plurality of time deviations, ask for the arithmetic mean of remaining time deviation, utilize this arithmetic mean synchronised clock.
The third aspect, the present invention also provides a kind of clock synchronous control system based on SNTP, comprise: clock synchronous client, and receive the SNTP unitcast request message that described clock synchronous client sends, and send the clock synchronous server of SNTP response message; In wherein said clock synchronous client, be provided with the clock synchronous control device based on SNTP.
By above-mentioned technical scheme, can be found out, in embodiments of the present invention, first clock synchronous client is obtained the IP address of at least one clock synchronous server, and IP address is kept in address pool; Automatic discovery clock synchronous server address be can realize, without static networking configuration, thereby the complexity of networking and the workload of later maintenance reduced.Then, clock synchronous server is according to default clock synchronous server ip address distribution principle, from address pool, select an IP address as the IP address of destination server, can from current network, select to provide the clock synchronous server of clock synchronous service; Again then, clock synchronous server sends SNTP unitcast request message to selected destination server, receive the SNTP response message that this destination server sends, clock synchronous server just can be according to the time of the timestamp in message, the time that sends message and reception message, computing time deviation, finally, clock synchronous client utilizes this time deviation just can realize clock synchronous; Known in sum: technical solution of the present invention is without static configuration IP address, the mode of the IP address by Dynamic Discovery clock synchronous server, the reliability of clock synchronous can either be guaranteed, the complexity of clock synchronous control system and the workload of later maintenance can be reduced again.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the flow chart of the embodiment 1 of the clock synchronization control method of the embodiment of the present invention based on SNTP;
Fig. 2 is the flow chart of the embodiment 2 of the clock synchronization control method of the embodiment of the present invention based on SNTP;
Fig. 3 is the flow chart of the embodiment 1 of the clock synchronous control device of the embodiment of the present invention based on SNTP;
Fig. 4 is the schematic diagram of the embodiment 1 of the clock synchronous control system of the embodiment of the present invention based on SNTP.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Consult Fig. 1, Fig. 1 is the flow chart of the embodiment 1 of the clock synchronization control method of the embodiment of the present invention based on SNTP; As shown in Figure 1, the method comprises the following steps:
S101, clock synchronous client is obtained the IP address of at least one clock synchronous server, and IP address is kept in address pool;
When specific implementation, in order to make all clock synchronous clients get the IP address of clock synchronous server, the clock synchronous server in control system can send SNTP broadcast synchronization message to all clock synchronous clients in the mode of broadcast.Clock synchronous client can be intercepted the SNTP broadcast synchronization message that clock synchronous server sends, the IP address that obtains corresponding clock synchronous server from this message.The IP address that at least comprises clock synchronous server in SNTP broadcast synchronization message, the information such as timestamp of transmission SNTP broadcast synchronization message.
When specific implementation, in order to make clock synchronous client after electrifying startup or in office what is the need for while wanting, can start at any time synchronizing process, clock synchronous client also can initiatively send SNTP broadcast query message, the SNTP response message that receive clock synchronization server sends, the IP address that obtains clock synchronous server from described SNTP response message.The information such as timestamp that at least comprise the IP address of clock synchronous server, the timestamp that sends SNTP response message, reception SNTP broadcast query message in described SNTP response message.
When specific implementation, in order to improve clock synchronous client, obtain the reliability of clock synchronous server ip address, can also adopt above-mentioned two kinds of modes simultaneously.
Wherein timestamp can be comprise second above, second and summation time of second following time, for example, the timestamp comprising in clock synchronous client transmission SNTP broadcast synchronization message is 12.38.20.25.Wherein, according to decimal point, divide, 20 is the position of second, i.e. the time of second, 12.38 represent 12: 38, are the time more than second; 25 represent 25 milliseconds, are the time below second.Second above, second and the summation of second following time form 12: 38: 20 25 milliseconds, be the time of clock synchronous client transmission SNTP broadcast synchronization message.
S102, described clock synchronous client, according to default clock synchronous server ip address distribution principle, selects an IP address as the IP address of destination server from address pool;
When specific implementation, due in industrial automatic control field, its clock synchronous server ip address distribution principle adopting of different control system may be different, therefore clock synchronous server ip address distribution principle that will be based on actual when specific implementation, select destination server, that is, the server of clock synchronous service can be provided; Consider in order to meet the reliability of clock synchronous client clock synchronous in control system, generally, can set up in advance a plurality of clock synchronous servers to meet redundancy demand.Like this, through after S101, clock synchronous client may get at least one IP address, for the ease of subsequent clock simultaneous operation, clock synchronous client need to be set up an address pool (database is used for preserving address), and all IP addresses that get are all kept in this address pool.
When specific implementation, the present embodiment also provides following several simple clock synchronous server ip address distribution principles, and for the concrete implementation of these distribution principles S102.
The first distribution principle is, distribution principle based on domain addresses minimum in whole control system is intrasystem each clock synchronous server-assignment IP address, after distributing like this, each clock synchronous server is than other equipment in system, the domain addresses of its IP address is always less than the domain addresses of other IP address of equipment, therefore, described clock synchronous client, according to the principle of domain addresses minimum, selects the IP address of domain addresses minimum as the IP address of destination server from address pool.
The second distribution principle is, distribution principle based on domain addresses maximum in whole control system is intrasystem each clock synchronous server-assignment IP address, after distributing like this, each clock synchronous server is than other equipment in system, the domain addresses of its IP address is always greater than the domain addresses of other IP address of equipment, therefore, described clock synchronous client, according to the principle of domain addresses maximum, selects the IP address of domain addresses maximum as the IP address of destination server from address pool.
The third distribution principle is, distribution principle based on device address minimum in whole control system is intrasystem each clock synchronous server-assignment IP address, after distributing like this, each clock synchronous server is than other equipment in system, device address in its IP address is always less than the device address in other IP address of equipment, therefore, described clock synchronous client, according to the principle of device address minimum, selects the IP address of device address minimum as the IP address of destination server from address pool.
The 4th kind of distribution principle is, in whole control system based on according to intrasystem each the clock synchronous server-assignment IP address of being assigned as of device address maximum, after distributing like this, each clock synchronous server is than other equipment in system, the domain addresses of its IP address is always greater than the device address of other IP address of equipment, therefore, described clock synchronous client, according to the principle of device address maximum, selects the IP address of device address maximum as the IP address of destination server from address pool.
Certainly, when specific implementation, if control system adopts other IP address assignment principle, S102 is just corresponding to this distribution principle executable operations.
S103, described clock synchronous client sends SNTP unitcast request message according to selected IP address to destination server, receives the SNTP response message that described destination server sends;
When specific implementation, described clock synchronous customer end adopted point-to-point communication mode, to destination server, send SNTP unitcast request message, after this destination server receives SNTP unitcast request message, to described clock synchronous client, send SNTP response message, in this SNTP response message, at least comprise the timestamp that clock synchronous server receives SNTP unitcast request message, the information such as timestamp that send SNTP response message.
When specific implementation, when if described clock synchronous client and clock synchronous server point-to-point communication are abnormal, described clock synchronous customer end adopted broadcast mode sends SNTP request message, and the employing broadcast mode that described clock synchronous server is corresponding sends SNTP response message.
When specific implementation, described clock synchronous client can send SNTP unitcast request message according to predetermined period, and sends preset number SNTP unitcast request message at every turn, receives the SNTP response message that described destination server sends.For described destination server, while often receiving a SNTP request message, just to clock synchronous client, send a SNTP response message.Therefore, clock synchronous client can receive the SNTP response message of preset number.
S104, described clock synchronous client, according to transmitting time and the time of reception of SNTP response message time of the timestamp of the timestamp in described SNTP unitcast request message, SNTP response message, SNTP unitcast request message, is calculated the time deviation between described clock synchronous client and described destination server;
When specific implementation, if clock synchronous client only sends SNTP request message one time, described clock synchronous client only receives the SNTP response message that a clock synchronous server sends, according to S104, calculate and this clock synchronous server between time deviation, thereby calculate a time deviation;
When specific implementation, if clock synchronous client periodically sends SNTP unitcast request message, and send the SNTP unitcast request message of preset number at every turn, clock synchronous client may receive two or more SNTP response messages that clock synchronous server sends, now, clock synchronous client according to S104, calculate and clock synchronous server between time deviation, thereby calculate two or more time deviations.
S105, described clock synchronous client realizes clock synchronous according to described time deviation and processes.
When specific implementation, when clock sync client calculates a clock jitter, directly utilize this time deviation to realize clock synchronous; If while calculating two clock jitters, can ask for a mean value, recycle this mean value and realize clock synchronous; If while calculating two above clock jitters, can remove maximum and minimum value, ask for the arithmetic mean of residue clock jitter, recycle this arithmetic mean and realize clock synchronous.
When specific implementation, control system has certain requirement to the clock precision of clock synchronous client, therefore in actual synchronization process, needs to carry out targetedly simultaneous operation, in addition, what sometimes the clock of clock synchronous client was walked is fast, may be faster than clock synchronous server; What sometimes the clock of clock synchronous client was walked is slow, possible slow and clock synchronous server; Clock out of step conditions for different, need to adopt different clock synchronization mode.Concrete, the implementation of described step S105 at least comprises the following steps:
When described clock synchronous client judges that described time deviation is greater than threshold value, or time of described clock synchronous client while being less than the time of destination server, described clock synchronous client is adjusted self clock based on described time deviation;
When the time of described clock synchronous client is greater than the time of destination server, described clock synchronous client operation suspension clock is until be synchronized to the time of destination server.
Therefore in the embodiment of the present invention, first clock synchronous client obtains the IP address of at least one clock synchronous server, and IP address is kept in address pool; Automatic discovery clock synchronous server address be can realize, without static networking configuration, thereby the complexity of networking and the workload of later maintenance reduced.Then, clock synchronous server is according to default clock synchronous server ip address distribution principle, from address pool, select an IP address as the IP address of destination server, can from current network, select to provide the clock synchronous server of clock synchronous service; Again then, clock synchronous server sends SNTP unitcast request message to selected destination server, receive the SNTP response message that this destination server sends, clock synchronous server just can be according to the time of the timestamp in message, the time that sends message and reception message, computing time deviation, finally, clock synchronous client utilizes this time deviation just can realize clock synchronous; Known in sum: technical solution of the present invention is without static configuration IP address, the mode of the IP address by Dynamic Discovery clock synchronous server, the reliability of clock synchronous can either be guaranteed, the complexity of clock synchronous control system and the workload of later maintenance can be reduced again.
Consider that clock synchronization server may cause it that clock synchronous service cannot be provided due to hardware or the software fault of burst when specific implementation, for example clock synchronous client sends SNTP request message to selected destination server, but in Preset Time, do not receive the SNTP response message that described destination server sends, show that this destination server also can now cannot provide clock synchronous service due to self reason or because network reason causes it, under this scene, clock synchronous client just cannot utilize this destination server to realize clock synchronous, in order to guarantee the reliability of clock synchronous client executing clock synchronous, the embodiment of the present invention provides again a kind of clock synchronization control method based on SNTP, the concrete Fig. 2 that participates in, Fig. 2 is the flow chart of the embodiment 2 of the clock synchronization control method of the embodiment of the present invention based on SNTP, as can be seen from Figure 2, the method at least comprises the following steps:
S201, clock synchronous client is obtained the IP address of at least one clock synchronous server, and IP address is kept in address pool;
S202, described clock synchronous client, according to default clock synchronous server ip address distribution principle, selects an IP address as the IP address of destination server from address pool;
S203, described clock synchronous client sends SNTP unitcast request message according to selected IP address to destination server;
S201～S203 is identical with S101～S103, does not repeat them here.
S204, whether described clock synchronous client control receives the SNTP response message that described destination server sends in Preset Time; If not, carry out S205, if so, carry out S206;
S205, described clock synchronous client is first deleted selected IP address scheduler pond from described address pool, proceed to again S202, again carry out according to default clock synchronous server ip address distribution principle, from address pool, select an IP address as the operation of the IP address of destination server.If carried out while still not receiving to S204, carry out again S205, so circulation is carried out until receive the SNTP response message that a destination server sends.
When specific implementation, clock synchronous client can periodically be obtained the IP address of at least one clock synchronous server, also can monitored address pond, when the IP address in monitored address pond is less than preset number, clock synchronous client starts the operation of the IP address that obtains clock synchronous server at once, and then scheduler pond, to guarantee to exist in address pool the IP address of some, guarantee the normal execution of whole synchronizing process.
Further, if do not receive the SNTP response message that destination server sends in Preset Time, show that now this destination server breaks down, likely hardware, software or network failure, the personnel that now need repairing overhaul in time, can guarantee the normal operation of whole system, based on this, when described clock synchronous client does not receive the SNTP response message of described destination server transmission in Preset Time, described method comprises:
Described clock synchronous client sends a warning message, and described warning information is used for notifying destination server described in operating personnel to break down.
S206, described clock synchronous client, according to transmitting time and the time of reception of SNTP response message time of the timestamp of the timestamp in described SNTP unitcast request message, SNTP response message, SNTP unitcast request message, is calculated the time deviation between described clock synchronous client and described destination server;
S207, described clock synchronous client realizes clock synchronous according to described time deviation and processes.
When specific implementation, in order to improve the reliability of utilizing clock jitter synchronised clock, described clock synchronous client can send SNTP unitcast request message to described destination server according to predetermined period, and send the SNTP unitcast request message of preset number at every turn, receive the SNTP response message that described destination server sends; That is, described clock synchronous client is periodically initiated synchronization request, and each cycle sends NGE SNTP unitcast request message, each SNTP unitcast request message certain interval of time.Such as: described clock synchronous client was initiated a SNTP unitcast request message at interval of 5 minutes, sent 5 SNTP unitcast request message bags, every inter-packet gap 5 seconds at every turn.After processing like this, clock synchronous client can calculate a plurality of clock jitters, in order to improve synchronization dependability.
When specific implementation, while having a plurality of clock synchronous clients all to need to carry out clock synchronous in system, each clock synchronous client time of staggering can be set sends SNTP unitcast request message, the time that is each clock synchronous client initiation clock synchronous staggers, can reduce network burst flow like this, reduce the possibility of network congestion.
S207 is specially described clock synchronous client and from a plurality of time deviations, removes maximum and minimum value, asks for the arithmetic mean of remaining time deviation, utilizes this arithmetic mean synchronised clock.
If only calculate three time deviations, directly calculate its mean value, utilize this mean value synchronised clock.
Therefore in the embodiment of the present invention, first clock synchronous client obtains the IP address of at least one clock synchronous server, and IP address is kept in address pool; Automatic discovery clock synchronous server address be can realize, without static networking configuration, thereby the complexity of networking and the workload of later maintenance reduced.Then, clock synchronous server is according to default clock synchronous server ip address distribution principle, from address pool, select an IP address as the IP address of destination server, can from current network, select to provide the clock synchronous server of clock synchronous service; Again then, clock synchronous server sends SNTP unitcast request message to selected destination server, receive the SNTP response message that this destination server sends, clock synchronous server just can be according to the time of the timestamp in message, the time that sends message and reception message, computing time deviation, finally, clock synchronous client utilizes this time deviation just can realize clock synchronous; Known in sum: technical solution of the present invention is without static configuration IP address, the mode of the IP address by Dynamic Discovery clock synchronous server, the reliability of clock synchronous can either be guaranteed, the complexity of clock synchronous control system and the workload of later maintenance can be reduced again.
Further, whether the embodiment of the present invention is by receiving the SNTP response message that destination server sends in monitoring Preset Time, to judge destination server, whether can normally work, if can not, from clock synchronous server of new selection, as destination server, utilize this monitoring mechanism and gravity treatment mechanism further to guarantee the reliability of simultaneous operation.
Corresponding with said method, the invention also discloses a kind of clock synchronous control device based on SNTP, referring to Fig. 3, Fig. 3 is the flow chart of the embodiment 1 of the clock synchronous control device of the embodiment of the present invention based on SNTP, as shown in Figure 3, this device can comprise address acquisition unit 301, destination server selected cell 302, synchronization request unit 303, time deviation computing unit 304 and clock synchronous unit;
Wherein address acquisition unit 301, obtain the IP address of at least one clock synchronous server for controlling clock synchronous client, and IP address is kept in address pool;
Destination server selected cell 302 for controlling described clock synchronous client according to default clock synchronous server ip address distribution principle, selects an IP address as the IP address of destination server from address pool;
Synchronization request unit 303, sends SNTP unitcast request message according to selected IP address to destination server for controlling described clock synchronous client, receives the SNTP response message that described destination server sends;
Time deviation computing unit 304, for controlling described clock synchronous client according to transmitting time and the time of reception of SNTP response message time of the timestamp of the timestamp of described SNTP unitcast request message, SNTP response message, SNTP unitcast request message, calculate the time deviation between described clock synchronous client and described destination server;
Clock synchronous unit 305, realizes clock synchronous processing for controlling described clock synchronous client according to described time deviation.
Concrete, described address acquisition unit comprises:
The first address acquisition subelement, intercepts the SNTP broadcast synchronization message that clock synchronous server sends, the IP address that obtains clock synchronous server from this message for controlling described clock synchronous client; And/or
The second address acquisition subelement, sends SNTP broadcast query message, the response message that receive clock synchronization server sends, the IP address that obtains clock synchronous server from described response message for controlling described clock synchronous client.
Concrete, described destination server selected cell, specifically for controlling described clock synchronous client according to the principle of domain addresses minimum, selects the IP address of domain addresses minimum as the IP address of destination server from address pool; Or,
Described destination server selected cell, specifically for controlling described clock synchronous client according to the principle of domain addresses maximum, selects the IP address of domain addresses maximum as the IP address of destination server from address pool; Or,
Described destination server selected cell, specifically for controlling described clock synchronous client according to the principle of device address minimum, selects the IP address of device address minimum as the IP address of destination server from address pool; Or,
Described destination server selected cell, specifically for controlling described clock synchronous client according to the principle of device address maximum, selects the IP address of device address maximum as the IP address of destination server from address pool.
Concrete, described clock synchronous unit 305 comprises: adjusts clock subelement and suspends clock subelement,
Wherein adjust clock subelement, for when described clock synchronous client judges that described time deviation is greater than threshold value, or the time of described clock synchronous client, while being less than the time of destination server, being controlled described clock synchronous client and adjusts self clock based on described time deviation;
Suspend clock subelement, while being greater than the time of destination server for the time when described clock synchronous client, control described clock synchronous client operation suspension clock until be synchronized to the time of destination server.
Concrete, described device can also comprise:
Whether monitoring unit, receive for controlling described clock synchronous client control the SNTP response message that described destination server sends in Preset Time; If so, deviation computing unit is carried out corresponding operation the triggered time; Otherwise, trigger address pool management unit;
Described address pool management unit, be used for controlling described clock synchronous client and first from described address pool, delete selected IP address, again carry out according to default clock synchronous server ip address distribution principle, from address pool, select an IP address as the operation of the IP address of destination server.
Concrete, described device can also comprise: Alarm Unit, be used for when described clock synchronous client does not receive the SNTP response message of described destination server transmission in Preset Time, control described clock synchronous client and send a warning message, described warning information is used for notifying destination server described in operating personnel to break down.
Concrete, described synchronization request unit sends SNTP unitcast request message according to predetermined period to described destination server specifically for controlling described clock synchronous client, and send the SNTP unitcast request message of preset number at every turn, receive the SNTP response message that described destination server sends;
Maximum and minimum value are removed specifically for controlling described clock synchronous client in described clock synchronous unit from a plurality of time deviations, ask for the arithmetic mean of remaining time deviation, utilize this arithmetic mean synchronised clock.
Each refinement function of above-mentioned unit or module can be referring to the relevant record of said method, and therefore not to repeat here.
It should be noted that, can be realized respectively by a plurality of independent CPU or single-chip microcomputer the function of above-mentioned each unit, module, also can be only by the function of a CPU or each unit of chip microcontroller, module.
Therefore, in embodiments of the present invention, utilize address acquisition unit, destination server selected cell, synchronization request unit, time deviation computing unit and the acting in conjunction of clock synchronous unit, to realize without static configuration IP address, the mode of the IP address by Dynamic Discovery clock synchronous server, the reliability of clock synchronous can either be guaranteed, the complexity of clock synchronous control system and the workload of later maintenance can be reduced again.
Corresponding with above-mentioned control method and control device, the embodiment of the invention also discloses a kind of based on SNTP clock synchronous control system, comprise clock synchronous client, and receive the SNTP unitcast request message that described clock synchronous client sends, and send the clock synchronous server of SNTP response message; In wherein said clock synchronous client, be provided with the clock synchronous control device based on SNTP.
Concrete, the number of clock synchronous client can be 1 or a plurality of, and the number of clock synchronous server can be 1 or a plurality of.In this embodiment, as shown in Figure 4, Fig. 4 is the schematic diagram of the embodiment 1 of the clock synchronous control system of the embodiment of the present invention based on SNTP, as shown in Figure 4, in this system, the number of clock synchronous client is 4, and the number of clock synchronous server is 3, and its clock synchronous control device based on SNTP is placed in clock synchronous client, wherein, clock synchronous client can communicate by high-speed bus and clock synchronous server.
When the specific implementation of industrial control field, clock synchronous server can be GPS equipment, can be also by operating software clock synchronous server in the active station in industrial system, that is, and and using active station as clock synchronous server.Clock synchronous client can be the equipment that active station in industrial control system, control station etc. need synchronised clock.
Wherein each refinement function of the clock synchronous control device based on SNTP, clock synchronous client, clock synchronous server can be referring to the relevant record of said method, and therefore not to repeat here.
It should be noted that, in this article, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby the stage, method, article or the equipment that make to comprise a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or be also included as the intrinsic key element of this stage, method, article or equipment.The in the situation that of more restrictions not, the key element being limited by statement " comprising ... ", and be not precluded within stage, method, article or the equipment that comprises described key element and also have other identical element.
One of ordinary skill in the art will appreciate that all or part of step realizing in said method execution mode is to complete by the relevant hardware of program command, described program can be stored in computer read/write memory medium, here alleged storage medium, as: ROM/RAM, magnetic disc, CD etc.
Above-mentioned explanation to the disclosed embodiments, makes professional and technical personnel in the field can realize or use the present invention.To the multiple modification of these embodiment, will be apparent for those skilled in the art, General Principle as defined herein can, in the situation that not departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (16)
1. the clock synchronization control method based on SNTP, is characterized in that, comprising:
Clock synchronous client is obtained the IP address of at least one clock synchronous server, and IP address is kept in address pool;
Described clock synchronous client, according to default clock synchronous server ip address distribution principle, selects an IP address as the IP address of destination server from address pool;
Described clock synchronous client sends SNTP unitcast request message according to selected IP address to destination server, receives the SNTP response message that described destination server sends;
Described clock synchronous client, according to transmitting time and the time of reception of SNTP response message time of the timestamp of the timestamp in described SNTP unitcast request message, SNTP response message, SNTP unitcast request message, is calculated the time deviation between described clock synchronous client and described destination server;
Described clock synchronous client realizes clock synchronous according to described time deviation and processes.
2. method according to claim 1, is characterized in that, the process that described clock synchronous client is obtained the IP address of at least one clock synchronous server comprises:
Described clock synchronous client is intercepted the SNTP broadcast synchronization message that clock synchronous server sends, the IP address that obtains clock synchronous server from this message; And/or
Described clock synchronous client sends SNTP broadcast query message, the response message that receive clock synchronization server sends, the IP address that obtains clock synchronous server from described response message.
3. method according to claim 1, is characterized in that, described clock synchronous client, according to default clock synchronous server ip address distribution principle, selects an IP address to comprise as the process of the IP address of destination server from address pool:
Described clock synchronous client, according to the principle of domain addresses minimum, selects the IP address of domain addresses minimum as the IP address of destination server from address pool; Or,
Described clock synchronous client, according to the principle of domain addresses maximum, selects the IP address of domain addresses maximum as the IP address of destination server from address pool; Or,
Described clock synchronous client, according to the principle of device address minimum, selects the IP address of device address minimum as the IP address of destination server from address pool; Or,
Described clock synchronous client, according to the principle of device address maximum, selects the IP address of device address maximum as the IP address of destination server from address pool.
4. method according to claim 1, is characterized in that, the step that described clock synchronous client realizes clock synchronous processing according to described time deviation comprises:
When described clock synchronous client judges that described time deviation is greater than threshold value, or time of described clock synchronous client while being less than the time of destination server, described clock synchronous client is adjusted self clock based on described time deviation;
When the time of described clock synchronous client is greater than the time of destination server, described clock synchronous client operation suspension clock is until be synchronized to the time of destination server.
5. method according to claim 1, is characterized in that, after sending SNTP unitcast request message according to selected IP address to destination server in described clock synchronous client, described method also comprises:
Whether described clock synchronous client control receives the SNTP response message that described destination server sends in Preset Time; If so, carry out the operation of the time deviation between the described clock synchronous client of described calculating and described destination server;
Otherwise, described clock synchronous client is first deleted selected IP address scheduler pond from described address pool, again carry out according to default clock synchronous server ip address distribution principle, from address pool, select an IP address as the operation of the IP address of destination server.
6. method according to claim 1, is characterized in that, when described clock synchronous client does not receive the SNTP response message of described destination server transmission in Preset Time, described method comprises:
Described clock synchronous client sends a warning message, and described warning information is used for notifying destination server described in operating personnel to break down.
7. method according to claim 1, is characterized in that, described clock synchronous client sends SNTP unitcast request message according to selected IP address to destination server, and the step that receives the SNTP response message of described destination server transmission comprises:
Described clock synchronous client sends SNTP unitcast request message according to predetermined period to described destination server, and sends the SNTP unitcast request message of preset number at every turn, receives the SNTP response message that described destination server sends;
Described clock synchronous client realizes clock synchronous according to described time deviation and processes and specifically to comprise:
Described clock synchronous client is removed maximum and minimum value from a plurality of time deviations, asks for the arithmetic mean of remaining time deviation, utilizes this arithmetic mean synchronised clock.
8. method according to claim 1, is characterized in that, when a plurality of clock synchronous clients need clock synchronous, each clock synchronous client time of staggering sends SNTP unitcast request message.
9. the clock synchronous control device based on SNTP, is characterized in that, comprising:
Address acquisition unit, the IP address that obtains at least one clock synchronous server for controlling clock synchronous client, and IP address is kept in address pool;
Destination server selected cell for controlling described clock synchronous client according to default clock synchronous server ip address distribution principle, selects an IP address as the IP address of destination server from address pool;
Synchronization request unit, sends SNTP unitcast request message according to selected IP address to destination server for controlling described clock synchronous client, receives the SNTP response message that described destination server sends;
Time deviation computing unit, for controlling described clock synchronous client according to transmitting time and the time of reception of SNTP response message time of the timestamp of the timestamp of described SNTP unitcast request message, SNTP response message, SNTP unitcast request message, calculate the time deviation between described clock synchronous client and described destination server;
Clock synchronous unit, realizes clock synchronous processing for controlling described clock synchronous client according to described time deviation.
10. device according to claim 9, is characterized in that, described address acquisition unit comprises:
The first address acquisition subelement, intercepts the SNTP broadcast synchronization message that clock synchronous server sends, the IP address that obtains clock synchronous server from this message for controlling described clock synchronous client; And/or
The second address acquisition subelement, sends SNTP broadcast query message, the response message that receive clock synchronization server sends, the IP address that obtains clock synchronous server from described response message for controlling described clock synchronous client.
11. devices according to claim 9, is characterized in that,
Described destination server selected cell, specifically for controlling described clock synchronous client according to the principle of domain addresses minimum, selects the IP address of domain addresses minimum as the IP address of destination server from address pool; Or,
Described destination server selected cell, specifically for controlling described clock synchronous client according to the principle of domain addresses maximum, selects the IP address of domain addresses maximum as the IP address of destination server from address pool; Or,
Described destination server selected cell, specifically for controlling described clock synchronous client according to the principle of device address minimum, selects the IP address of device address minimum as the IP address of destination server from address pool; Or,
Described destination server selected cell, specifically for controlling described clock synchronous client according to the principle of device address maximum, selects the IP address of device address maximum as the IP address of destination server from address pool.
12. devices according to claim 9, is characterized in that, described clock synchronous unit comprises:
Adjust clock subelement, for when described clock synchronous client judges that described time deviation is greater than threshold value, or the time of described clock synchronous client, while being less than the time of destination server, being controlled described clock synchronous client and adjusts self clock based on described time deviation;
Suspend clock subelement, while being greater than the time of destination server for the time when described clock synchronous client, control described clock synchronous client operation suspension clock until be synchronized to the time of destination server.
13. devices according to claim 9, is characterized in that, described device also comprises:
Whether monitoring unit, receive for controlling described clock synchronous client control the SNTP response message that described destination server sends in Preset Time; If so, deviation computing unit is carried out corresponding operation the triggered time; Otherwise, trigger address pool management unit;
Described address pool management unit, be used for controlling described clock synchronous client and first from described address pool, delete selected IP address, again carry out according to default clock synchronous server ip address distribution principle, from address pool, select an IP address as the operation of the IP address of destination server.
14. devices according to claim 9, is characterized in that, described device also comprises:
Alarm Unit, be used for when described clock synchronous client does not receive the SNTP response message of described destination server transmission in Preset Time, control described clock synchronous client and send a warning message, described warning information is used for notifying destination server described in operating personnel to break down.
15. devices according to claim 9, is characterized in that,
Described synchronization request unit sends SNTP unitcast request message according to predetermined period to described destination server specifically for controlling described clock synchronous client, and send the SNTP unitcast request message of preset number at every turn, receive the SNTP response message that described destination server sends;
Maximum and minimum value are removed specifically for controlling described clock synchronous client in described clock synchronous unit from a plurality of time deviations, ask for the arithmetic mean of remaining time deviation, utilize this arithmetic mean synchronised clock.
16. 1 kinds of clock synchronous control system based on SNTP, is characterized in that, comprise clock synchronous client, and receive the SNTP unitcast request message that described clock synchronous client sends, and send the clock synchronous server of SNTP response message; In wherein said clock synchronous client, be provided with the clock synchronous control device based on SNTP as described in claim 9～15 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410505363.0A CN104202204B (en) | 2014-09-26 | 2014-09-26 | Clock synchronization control method, apparatus and system based on SNTP |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410505363.0A CN104202204B (en) | 2014-09-26 | 2014-09-26 | Clock synchronization control method, apparatus and system based on SNTP |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104202204A true CN104202204A (en) | 2014-12-10 |
| CN104202204B CN104202204B (en) | 2017-10-10 |
Family
ID=52087434
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410505363.0A Active CN104202204B (en) | 2014-09-26 | 2014-09-26 | Clock synchronization control method, apparatus and system based on SNTP |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104202204B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105119679A (en) * | 2015-09-24 | 2015-12-02 | 烽火通信科技股份有限公司 | Method and system for realizing SNTP client time synchronization |
| WO2016165544A1 (en) * | 2015-04-17 | 2016-10-20 | 阿里巴巴集团控股有限公司 | Method and device for achieving cross-time-domain consistency in distributed system |
| CN108833047A (en) * | 2018-08-13 | 2018-11-16 | 东软集团股份有限公司 | Method for synchronizing time, device, readable storage medium storing program for executing and electronic equipment |
| CN112346512A (en) * | 2020-11-09 | 2021-02-09 | 北京沃东天骏信息技术有限公司 | Time synchronization method and device |
| CN112737844A (en) * | 2020-12-28 | 2021-04-30 | 浙江中控技术股份有限公司 | Method and device for switching between main and standby in redundant system |
| CN114520707A (en) * | 2022-01-24 | 2022-05-20 | 中银金融科技有限公司 | Clock synchronization method and related equipment |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005069521A1 (en) * | 2004-01-09 | 2005-07-28 | Thomson Licensing | Time synchronizing device and process and associated products |
| CN1863156A (en) * | 2005-10-25 | 2006-11-15 | 华为技术有限公司 | Method and system for providing clock synchronization by packet network |
| CN101136738A (en) * | 2007-10-08 | 2008-03-05 | 中控科技集团有限公司 | Network clock synchronous method, device and system |
| CN103023596A (en) * | 2012-12-04 | 2013-04-03 | 上海斐讯数据通信技术有限公司 | Method for achieving synchronization of network device and time server |
| CN202940822U (en) * | 2012-11-28 | 2013-05-15 | 中国舰船研究设计中心 | Marine local area network time unification system |
| CN104052565A (en) * | 2014-06-26 | 2014-09-17 | 青岛海信移动通信技术股份有限公司 | Time synchronization method and communication terminal |
-
2014
- 2014-09-26 CN CN201410505363.0A patent/CN104202204B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005069521A1 (en) * | 2004-01-09 | 2005-07-28 | Thomson Licensing | Time synchronizing device and process and associated products |
| CN1863156A (en) * | 2005-10-25 | 2006-11-15 | 华为技术有限公司 | Method and system for providing clock synchronization by packet network |
| CN101136738A (en) * | 2007-10-08 | 2008-03-05 | 中控科技集团有限公司 | Network clock synchronous method, device and system |
| CN202940822U (en) * | 2012-11-28 | 2013-05-15 | 中国舰船研究设计中心 | Marine local area network time unification system |
| CN103023596A (en) * | 2012-12-04 | 2013-04-03 | 上海斐讯数据通信技术有限公司 | Method for achieving synchronization of network device and time server |
| CN104052565A (en) * | 2014-06-26 | 2014-09-17 | 青岛海信移动通信技术股份有限公司 | Time synchronization method and communication terminal |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10547401B2 (en) | 2015-04-17 | 2020-01-28 | Alibaba Group Holding Limited | Managing time consistency in a distributed computing system |
| WO2016165544A1 (en) * | 2015-04-17 | 2016-10-20 | 阿里巴巴集团控股有限公司 | Method and device for achieving cross-time-domain consistency in distributed system |
| CN106157129A (en) * | 2015-04-17 | 2016-11-23 | 阿里巴巴集团控股有限公司 | One realizes distributed system across time domain coherence method and device |
| KR102121103B1 (en) | 2015-04-17 | 2020-06-10 | 알리바바 그룹 홀딩 리미티드 | Method and apparatus for implementing consistency across time domains in a distributed system |
| KR20170137839A (en) * | 2015-04-17 | 2017-12-13 | 알리바바 그룹 홀딩 리미티드 | METHOD AND APPARATUS FOR IMPLEMENTING CONSTANCE AGAINST TIME DOMAINS IN A DISTRIBUTED SYSTEM |
| CN106157129B (en) * | 2015-04-17 | 2020-02-07 | 阿里巴巴集团控股有限公司 | Method and device for realizing cross-time domain consistency of distributed system |
| CN105119679B (en) * | 2015-09-24 | 2017-09-29 | 烽火通信科技股份有限公司 | A kind of method and system for realizing that SNTP client times are synchronous |
| CN105119679A (en) * | 2015-09-24 | 2015-12-02 | 烽火通信科技股份有限公司 | Method and system for realizing SNTP client time synchronization |
| CN108833047A (en) * | 2018-08-13 | 2018-11-16 | 东软集团股份有限公司 | Method for synchronizing time, device, readable storage medium storing program for executing and electronic equipment |
| CN112346512A (en) * | 2020-11-09 | 2021-02-09 | 北京沃东天骏信息技术有限公司 | Time synchronization method and device |
| CN112737844A (en) * | 2020-12-28 | 2021-04-30 | 浙江中控技术股份有限公司 | Method and device for switching between main and standby in redundant system |
| CN114520707A (en) * | 2022-01-24 | 2022-05-20 | 中银金融科技有限公司 | Clock synchronization method and related equipment |
| CN114520707B (en) * | 2022-01-24 | 2024-05-24 | 中银金融科技有限公司 | Clock synchronization method and related equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104202204B (en) | 2017-10-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104202204A (en) | Clock synchronous control method, device and system based on SNTP | |
| EP3490224B1 (en) | Data synchronization method and system | |
| JP6450835B2 (en) | Energy saving control method, management server, and network device | |
| US11228520B2 (en) | Distributed database for synchronizing the accessibility of nodes and shared devices | |
| EP2688333B1 (en) | Parallel monitoring method and system for communication base station power sources | |
| US10162790B2 (en) | Method for clock synchronization of an industrial internet field broadband bus | |
| RU2619206C2 (en) | Method for providing name service within industrial communication system and router | |
| US10340981B2 (en) | Data center management using device identification over power-line | |
| US11206556B2 (en) | Power outage processing method and connection relationship obtaining method and device | |
| CN110933137A (en) | Data synchronization method, system, equipment and readable storage medium | |
| CN114070739B (en) | Cluster deployment method, device, equipment and computer readable storage medium | |
| CN111090562A (en) | Business process monitoring method, equipment and storage medium of edge intelligent gateway | |
| CN103973809A (en) | Data distributing method and system | |
| CN111726388A (en) | Cross-cluster high-availability implementation method, device, system and equipment | |
| US9055091B2 (en) | Adaptive timing of distributed device response to maximize channel capacity utilization | |
| CN114531373A (en) | Node state detection method, node state detection device, equipment and medium | |
| CN106411574B (en) | Management control method and device | |
| WO2023116806A1 (en) | Control method for real-time channel group, network system, and storage medium | |
| CN107005434B (en) | Method, device and equipment for synchronizing Virtual Network Function (VNF) state | |
| CN116346834A (en) | Session synchronization method, device, computing equipment and computer storage medium | |
| CN114448801B (en) | Method for creating real-time channel group, network topology, equipment and storage medium | |
| CN113422623B (en) | Management method, system, device, electronic equipment and storage medium | |
| CN111064618B (en) | Method, device, equipment and storage medium for realizing high availability of server | |
| JP2012064130A (en) | Data replication management method of distributed system | |
| CN108306703A (en) | A kind of method, apparatus and equipment of redundancy monitoring network time synchronization |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190514 Address after: 310053 No. 309 Liuhe Road, Binjiang District, Hangzhou City, Zhejiang Province Co-patentee after: Zhejiang University Patentee after: Zhongkong Technology Co., Ltd., Zhejiang Address before: 310053 Zhejiang Binjiang District Hangzhou six Road 309 central control science and Technology Park (high tech Zone) Patentee before: Zhongkong Technology Co., Ltd., Zhejiang |
|
| TR01 | Transfer of patent right |