CN101207606A - Method and apparatus for main clock selecting - Google Patents
Method and apparatus for main clock selecting Download PDFInfo
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- CN101207606A CN101207606A CNA2006101576822A CN200610157682A CN101207606A CN 101207606 A CN101207606 A CN 101207606A CN A2006101576822 A CNA2006101576822 A CN A2006101576822A CN 200610157682 A CN200610157682 A CN 200610157682A CN 101207606 A CN101207606 A CN 101207606A
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Abstract
The invention relates to a master clock selecting method and the device thereof. Each node has the own clock and keeps a second optimal clock. The method comprises the following steps: when each node determines that the own master clock fails, the node takes the own second optimal clock as the own current optimal clock. Each node determines the master clock according the current own optimal clock. By the invention, when the next selection of the master clock begins, the selection is carried out based on the second optimal clock learned by the node, instead of starting from the beginning, thereby reducing the transmission of broadcast messages and shortening the time used for master clock selection.
Description
Technical field
The present invention relates to the communication technology, relate in particular to a kind of method and apparatus of main clock selecting.
Background technology
In existing Internet network, it is synchronous that we use NTP (Network Time Protocol) or SNTP (Simple Network Time Protocol) to finish network clocking usually.But the synchronization accuracy of these agreements or convergence rate are slow, can't satisfy some demand to the very strict distributed network of clock synchronization requirement, for example need the AVB network of real-time Transmission voice and video stream.
IEEE 1588 is also referred to as PTP (Precision Time Protocol), and the basic function of IEEE 1588 PTP is that other clocks in the distributed network and a clock the most accurate are kept synchronously, and prior art PTP network topology schematic diagram is referring to Fig. 1.Whole network is made up of a plurality of nodes, and each node is all represented a clock, and self clock is promptly arranged.Clock in the network can be divided into ordinary clock OC (Ordinary Clock) and boundary clock BC (Boundary Clock), both differences are that ordinary clock has only a PTP port, and boundary clock comprises a plurality of PTP ports, and each PTP port can provide independently PTP communication.Have only an optimum clock to be called highest clock GMC (Grandmaster Clock) in the whole system.Each subnet connects each node by a communication path, in each sub-network, a master clock is all arranged, all the other clocks are from clock, keep synchronously from clock needs and master clock, can determine the master clock of sub-network according to the optimum master clock algorithm BMC of IEEE 1588, the highest clock GMC of the system that from the master clock of each subnet, selects then.
In IEEE1588 PTP, the optimum main clock selecting of network carries out as follows: during beginning, all nodes all think it oneself is master clock, and periodically (be generally 2 seconds) and externally send the Announce message in the multicast mode, having comprised the clock character of this node in this Announce message, described clock character has comprised the good and bad accurately degree of clock, in this article, the good and bad accurately degree of clock represents that with the priority of clock priority is high more, and the expression clock is accurate more.If think it oneself is that certain node of master clock is received an Announce message that has comprised than its better clock, this clock node will stop externally to state that it is a master clock so, thinks it oneself is from clock.Otherwise if the clock of a node is individual from clock, it is better than current master clock that it is determined, it will think it is master clock itself, and begin to send the Announce message.According to IEEE1588, node judges that the foundation that master clock lost efficacy is if the lasting T time is not received the Announce message from master clock, will think that master clock had lost efficacy.The T time is generally the Announce message and sends integral multiple at interval herein.In IEEE1588, after network master clock is lost, need carry out the BMC election again, and this election process realizes by send multicast message mutually in subnet, bigger to the network load influence.
Summary of the invention
In view of this, main purpose of the present invention provides a kind of method and apparatus of main clock selecting.
The objective of the invention is to be achieved through the following technical solutions:
The invention provides a kind of main clock selecting method, each node has self clock, and preserves self suboptimum clock, comprises the steps:
When described each node is judged master clock and was lost efficacy, will be described self suboptimum clock rising be defined as self current optimum clock;
Described each node is determined master clock according to described self current optimum clock.
Described each node preservation self suboptimum clock specifically comprises:
Described each node sends Announce message separately, contains self clock in the described Announce message;
Clock and self current optimum clock in the Announce message that described each node comparison is received carry out priority ratio, preserve priority time high be self suboptimum clock.
Described each node determines that according to described self current optimum clock master clock specifically comprises:
The consistent node of self node and self current optimum clock sends the Announce message, contains the clock of described self node node consistent with self current optimum clock in the described Announce message;
The node of receiving the Announce message obtains the clock in the described Announce message, and judges whether the clock in the Announce message is identical with the priority of self current optimum clock;
The priority of the clock in current optimum clock of described each node comparison self and the described Announce message, the clock that priority is the highest is determined master clock.
Described each node is determined also further to comprise behind the master clock according to described self current optimum clock:
Described each node is determined self suboptimum clock with the clock of priority suboptimum, and node is preserved described self suboptimum clock.
Described each node is determined self suboptimum clock with the clock of priority suboptimum, and node also further comprises after preserving described self suboptimum clock:
Self clock sends a request message to self clock and the consistent node of master clock with the inconsistent node of master clock, carries described self suboptimum clock in the described request message;
After described self clock node consistent with master clock receives the described request message, the priority of self the suboptimum clock that relatively carries in self suboptimum clock and the described request message, with priority high confirm as network suboptimum clock;
Described self clock node consistent with master clock sends response message to described self clock and inconsistent node of master clock, carries described network suboptimum clock in the described response message;
Described self clock and the inconsistent node of master clock extract described network suboptimum clock and replace self suboptimum clock.
Described request message is carried by Delay_Req; Correspondingly, described response message is carried by Delay_Resp.
In addition, the present invention also provides a kind of main clock selecting device, comprising:
Memory cell: be used to store self suboptimum clock;
Detecting unit: the state that is used to detect master clock;
Clock upgrading unit: when detecting unit detects master clock and lost efficacy, self suboptimum clock of being preserved in the memory cell is risen to self current optimum clock;
Main clock selecting unit: be used for the clock election that priority is the highest and be master clock.
Described main clock selecting unit further comprises:
The message sending module: the node consistent by self clock and self current optimum clock starts, and is used to send the Announce message, contains self clock of described node in the described Announce message;
Message receiver module:, be used to receive described Announce message by self clock and the inconsistent node startup of self current optimum clock;
Priority comparison module: be used for the priority of the clock of current optimum clock of comparison self and described Announce message, and select the highest clock of priority;
Master clock determination module: be used for result, the highest clock of described priority is defined as master clock according to the priority comparison module.
Also comprise:
Suboptimum clock request message transmitting element: by self clock and the inconsistent node startup of master clock, be used to send request message, carry self suboptimum clock in the described request message to self clock node consistent with master clock;
Suboptimum clock priority comparison module: be used for the priority of self suboptimum clock of comparison self suboptimum clock and described request message, and to select the highest suboptimum clock of priority be network suboptimum clock;
Suboptimum clock response message transmitting element: start by self clock node consistent with master clock, be used to receive and send response message behind the described request message, carry the described network suboptimum clock that is obtained according to the priority comparison module in the described response message to described self clock and inconsistent node of master clock;
Up-to-date suboptimum clock is replaced the unit: be used for self suboptimum clock is replaced with described network suboptimum clock.
As seen from the above technical solution provided by the invention, the present invention just is based on that suboptimum clock that node preserves carries out, promptly when main clock selecting begins next time, to carry out based on the suboptimum clock that each node has been recognized, rather than restart, broadcast sends in the network thereby can reduce, and shortens the time of main clock selecting mechanism.
Description of drawings
Fig. 1 is a prior art PTP network topology schematic diagram;
Fig. 2 is an embodiment of the invention main clock selecting method flow diagram;
Fig. 3 is the nodal clock state variation schematic diagram of self suboptimum clock of embodiments of the invention when rising to self current optimum clock;
Fig. 4 is each node of the embodiment of the invention is determined master clock according to self current optimum clock a method flow diagram;
Fig. 5 is a kind of main clock selecting device schematic diagram of the embodiment of the invention;
Fig. 6 is the schematic diagram of the main clock selecting unit of the embodiment of the invention.
Embodiment
Introduce for convenience, the invention process example assumes PTP system has only a subnet, and promptly master clock is exactly GMC.The PTP main clock selecting can adopt periodically and send the Announce message, has carried the clock character of this node in this message.
For making the purpose, technical solutions and advantages of the present invention clearer, by the following examples, and with reference to accompanying drawing, the present invention is described in more detail.
With reference to figure 2, Fig. 2 is an embodiment of the invention main clock selecting method flow diagram;
Carry out in the main clock selecting process first time at network, when beginning, all nodes all think it oneself is self current optimum clock, and all send the Announce message respectively to other nodes, the Announce message that each node sends carries the character of self clock respectively, like this, all nodes all can be received the Announce message that other nodes are sent, and according to the clock character in the received Announce message, by comparison clock priority, the clock that priority is the highest is updated to self current optimum clock, the clock of priority suboptimum is confirmed as self suboptimum clock, and described node is preserved described self suboptimum clock.When main clock selecting finished, the clock that all nodes are the highest with priority was defined as master clock, and like this, the master clock that all nodes keep can be same.Simultaneously, all nodes are preserved self suboptimum clock.
For convenience, optimum clock is meant the clock that priority level is the highest in the subsequent descriptions; The suboptimum clock is meant priority level time high clock.
Form the present invention of Announce message is unqualified, can carry out with reference to optimum master clock algorithm BMC.Like this, each node all can be preserved optimum clock and suboptimum clock character in the own at present network of being recognized according to the Announce message of receiving.
When step 201, each node are judged master clock and were lost efficacy, will be described self suboptimum clock rising be defined as self current optimum clock;
In the specific implementation of the embodiment of the invention, described each node judges that the foundation that master clock lost efficacy is if continue for some time the Announce message of not receiving from master clock, will think that master clock had lost efficacy.Need to prove that described continuing for some time is a configurable parameter.Described suboptimum clock risen is defined as the specific implementation of current optimum clock, and the present invention is unqualified, can be with reference to the mode among the IEEE 1588.
Because self suboptimum clock that each node is preserved might not be identical, this be because each node participate in the time of main clock selecting may be different, perhaps situation such as message dropping, the suboptimum clock is not same probably.For example, clock node A is arranged in the network, B, C, D wherein supposes the following A＞D of clock priority＞B＞C.The A early start sends own Announce message, and B has also sent the Announce message of oneself afterwards, and node D is at A just, and B sends between oneself the Announce message adding just respectively, and this makes D only receive the Announce message of B.When election finishes, A, B, self suboptimum clock that C is consistent to be preserved is A, self suboptimum clock that D then preserves is oneself.Like this, through election, the node in the network is understood the suboptimum clock that own node can be recognized at present at least.
After self suboptimum clock of each node rises to self current optimum clock, self current optimum clock that each node is preserved also may be different, there are following two kinds of possibility situations, can be with reference to figure 3, the nodal clock state variation schematic diagram when Fig. 3 rises to self current optimum clock for self suboptimum clock of the embodiment of the invention; If self current optimum clock that certain node is preserved at present is A, self suboptimum clock is B, when master clock lost efficacy, when self suboptimum clock rises to self current optimum clock, self current optimum clock of this node will become clock B, and self suboptimum clock will be self clock; If self current optimum clock that certain node is preserved at present is A, self suboptimum clock be self clock, when the master clock inefficacy, when self suboptimum clock rises to self current optimum clock, self current optimum clock of this node will become self clock, and at this moment, this node does not have the suboptimum clock.
Step 202, described each node are determined master clock according to described self current optimum clock.
In the specific implementation of the embodiment of the invention, described each node determines that according to described self current optimum clock the mode of master clock does not have concrete qualification, can be with reference to the mode among the IEEE 1588.Simultaneously, can be with reference to figure 4, Fig. 4 is each node of the embodiment of the invention is determined master clock according to self current optimum clock a method flow diagram;
The consistent node of self node and self current optimum clock sends the Announce message, contains the clock of described self node node consistent with self current optimum clock in the described Announce message;
The front was described, after self suboptimum clock of each node rises to self current optimum clock, self current optimum clock that described each node is preserved also may be different, so self clock and the inconsistent node of self current optimum clock can not send the Announce message to other nodes.
The node of receiving the Announce message obtains the clock in the described Announce message, and judges whether the clock in the Announce message is identical with the priority of self current optimum clock;
The priority of the clock in current optimum clock of described each node comparison self and the described Announce message, the clock that priority is the highest is determined master clock.The priority of self current optimum clock that even described each node is preserved is identical, and self current optimum clock of then each node being preserved is defined as master clock; If the priority difference of self current optimum clock of described each node, then the node that each node is the highest with priority is defined as master clock.
Described each node is determined also further to comprise behind the master clock according to described self current optimum clock:
Described each node is determined self suboptimum clock with the clock of priority suboptimum, and node is preserved described self suboptimum clock.
Self clock sends a request message to self clock and the consistent node of master clock with the inconsistent node of master clock, carries described self suboptimum clock in the described request message;
After described self clock node consistent with master clock receives the described request message, the priority of self the suboptimum clock that relatively carries in self suboptimum clock and the described request message, with priority high confirm as network suboptimum clock;
Described self clock node consistent with master clock sends response message to described self clock and inconsistent node of master clock, carries described network suboptimum clock in the described response message;
Described self clock and the inconsistent node of master clock extract described network suboptimum clock and replace self suboptimum clock.
At this moment, when main clock selecting finished, self current optimum clock that all nodes are preserved can be same, and simultaneously, all nodes can be preserved self suboptimum clock.
Like this, if the consistent node of self clock and self current optimum clock regularly outwards sends the Announce message; Self clock and the inconsistent node of self current optimum clock receive only the Announce message; When main clock selecting finishes, then have only self clock node consistent to send the Announce message with master clock, self clock and the inconsistent node of master clock receive only described Announce message.Have a kind of situation to need to consider, if before master clock lost efficacy, self suboptimum clock that certain node is preserved had also lost efficacy.In this case, because main clock selecting is when restarting, self current optimum clock that the suboptimum clock becomes that this node recognizes at present, so judge in the BMC mechanism that the method that master clock lost efficacy is still available here.Promptly after self suboptimum clock of node rises to self current optimum clock, still do not receive the Announce message of the node transmission that self clock is consistent with self current optimum clock through the T time, think that so described self current optimum clock lost efficacy, and will re-execute the main clock selecting process.If before main clock selecting restarts, existing a plurality of grades lost efficacy than higher clock in the network, may prolong the election time.
In embodiments of the present invention, in order to reduce the election time further, master clock is after being elected, self clock and the inconsistent node of master clock are (for convenience, follow-up this node is called from clock), can send a request message respectively to self clock and the inconsistent node of master clock (for convenience, follow-up this node is called master clock), carry self suboptimum clock in the described request message.After master clock receives the described request message,, thereby draw networking suboptimum clock by the priority of self the suboptimum clock in self suboptimum clock relatively and the described request message of being received.Then, master clock is by carrying described network suboptimum clock and sending to described from clock, described from the own suboptimum clock of being preserved of the described network suboptimum of Clock Extraction clock replacement in response message.
Need to prove that request message in the embodiment of the invention and response message all can periodically send, and in embodiments of the present invention, the form of request message does not limit.If during the Time delay measurement that network can be supported to describe among the IEEE1588, can the Delay_Req message, carry self suboptimum clock and send to master clock from clock.Master clock is by the priority of the suboptimum clock in self suboptimum clock relatively and the described Delay_Req message of being received, thereby can draw network suboptimum clock, master clock is by carrying described up-to-date suboptimum clock in the Delay_Resp message and sending to described from clock then; After receiving Delay_Resp, clock substitutes self suboptimum clock with the network suboptimum clock the described message.The network suboptimum clock that obtains like this will be more reliable, more near the network actual conditions.
Like this, if existing a plurality of grades were than higher losing efficacy from clock in the network before master clock loses efficacy, the scheme that the embodiment of the invention provides can further reduce the election time, thereby optimizes main clock selecting mechanism.
In addition, the embodiment of the invention also discloses a kind of main clock selecting device, can be with reference to figure 5, Fig. 5 is a kind of main clock selecting device schematic diagram of the embodiment of the invention.Comprise:
Memory cell: be used to store self suboptimum clock;
Detecting unit: the state that is used to detect master clock;
Clock upgrading unit: when detecting unit detects master clock and lost efficacy, self suboptimum clock of being preserved in the memory cell is risen to self current optimum clock;
Main clock selecting unit: be used for the clock election that priority is the highest and be master clock.
The front was described, and after the suboptimum clock rose to optimum clock, the optimum clock that each node is thought also may be different, so the node of each corresponding current optimum clock sends the Announce message of oneself respectively to other nodes.So, can be with reference to figure 6, Fig. 6 is the schematic diagram of the main clock selecting unit of the embodiment of the invention.Described main clock selecting unit may further include:
The message sending module: the node consistent by self clock and self current optimum clock starts, and is used to send the Announce message, contains self clock of described node in the described Announce message;
Message receiver module:, be used to receive described Announce message by self clock and the inconsistent node startup of self current optimum clock;
Priority comparison module: be used for the priority of the clock of current optimum clock of comparison self and described Announce message, and select the highest clock of priority;
Master clock determination module: be used for result, the highest clock of described priority is defined as master clock according to the priority comparison module.
In embodiments of the present invention, in order further to reduce the election time, the main clock selecting device can also comprise:
Suboptimum clock request message transmitting element: by self clock and the inconsistent node startup of master clock, be used to send request message, carry self suboptimum clock in the described request message to self clock node consistent with master clock;
Suboptimum clock priority comparison module: be used for the priority of self suboptimum clock of comparison self suboptimum clock and described request message, and to select the highest suboptimum clock of priority be network suboptimum clock;
Suboptimum clock response message transmitting element: start by self clock node consistent with master clock, be used to receive and send response message behind the described request message, carry the described network suboptimum clock that is obtained according to the priority comparison module in the described response message to described self clock and inconsistent node of master clock;
Up-to-date suboptimum clock is replaced the unit: be used for self suboptimum clock is replaced with described network suboptimum clock.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with the people of this technology in the disclosed technical scope of the present invention; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.
Claims (9)
1. a main clock selecting method is characterized in that, each node has self clock, and preserves self suboptimum clock, comprises the steps:
When described each node is judged master clock and was lost efficacy, will be described self suboptimum clock rising be defined as self current optimum clock;
Described each node is determined master clock according to described self current optimum clock.
2. method according to claim 1 is characterized in that, described each node preservation self suboptimum clock specifically comprises:
Described each node sends Announce message separately, contains self clock in the described Announce message;
Described each node carries out priority ratio with the clock in the Announce message of receiving and self current optimum clock, preserve priority time high be self suboptimum clock.
3. method according to claim 1 is characterized in that, described each node determines that according to described self current optimum clock master clock specifically comprises:
The consistent node of self node and self current optimum clock sends the Announce message, contains described self node and consistent node self clock of self current optimum clock in the described Announce message;
The node of receiving the Announce message obtains the clock in the described Announce message, and judges whether clock described in the Announce message is identical with the priority of self current optimum clock;
The priority of the clock in current optimum clock of described each node comparison self and the described Announce message, the clock that priority is the highest is determined master clock.
4. method according to claim 1 is characterized in that, described each node is determined also further to comprise behind the master clock according to described self current optimum clock:
Described each node is determined self suboptimum clock with the clock of priority suboptimum, and node is preserved described self suboptimum clock.
5. method according to claim 4 is characterized in that, described each node is determined self suboptimum clock with the clock of priority suboptimum, and node also further comprises after preserving described self suboptimum clock:
Self clock sends a request message to self clock and the consistent node of master clock with the inconsistent node of master clock, carries described self suboptimum clock in the described request message;
After described self clock node consistent with master clock receives the described request message, the priority of self the suboptimum clock that relatively carries in self suboptimum clock and the described request message, with priority high confirm as network suboptimum clock;
Described self clock node consistent with master clock sends response message to described self clock and inconsistent node of master clock, carries described network suboptimum clock in the described response message;
Described self clock and the inconsistent node of master clock extract described network suboptimum clock and replace self suboptimum clock.
6. method according to claim 5 is characterized in that described request message is carried by Delay_Req; Correspondingly, described response message is carried by Delay_Resp.
7. a main clock selecting device is characterized in that, comprising:
Memory cell: be used to store self suboptimum clock;
Detecting unit: the state that is used to detect master clock;
Clock upgrading unit: when detecting unit detects master clock and lost efficacy, self suboptimum clock of being preserved in the memory cell is risen to self current optimum clock;
Main clock selecting unit: be used for the clock election that priority is the highest and be master clock.
8. device according to claim 7 is characterized in that, described main clock selecting unit further comprises:
Message sending module: by self clock and the consistent node startup of self current optimum clock, be used to send the Announce message, contain described node self clock in the described Announce message;
Message receiver module:, be used to receive described Announce message by self clock and the inconsistent node startup of self current optimum clock;
Priority comparison module: be used for the priority of the clock of current optimum clock of comparison self and described Announce message, and select the highest clock of priority;
Master clock determination module: be used for result, the highest clock of described priority is defined as master clock according to the priority comparison module.
9. device according to claim 7 is characterized in that, also comprises:
Suboptimum clock request message transmitting element: by self clock and the inconsistent node startup of master clock, be used to send request message, carry self suboptimum clock in the described request message to self clock node consistent with master clock;
Suboptimum clock priority comparison module: be used for the priority of self suboptimum clock of comparison self suboptimum clock and described request message, and to select the highest suboptimum clock of priority be network suboptimum clock;
Suboptimum clock response message transmitting element: start by self clock node consistent with master clock, be used to receive and send response message behind the described request message, carry the described network suboptimum clock that is obtained according to the priority comparison module in the described response message to described self clock and inconsistent node of master clock;
Up-to-date suboptimum clock is replaced the unit: be used for self suboptimum clock is replaced with described network suboptimum clock.
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