CN103078699B - Method and the network equipment of time synchronized is carried out based on precision time protocol - Google Patents
Method and the network equipment of time synchronized is carried out based on precision time protocol Download PDFInfo
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Abstract
The embodiment of the present invention provides a kind of method and the network equipment that carry out time synchronized based on precision time protocol.The method comprises: the first sync message that master clock sends arrives the Line Processing Unit of the network equipment, Line Processing Unit forwards the second sync message to the Main Processor Unit of the network equipment, Main Processor Unit generates the 3rd sync message according to the second sync message, generate first according to the 3rd sync message again and postpone request message, then postpone request message according to first generate the second delay request message and be transmitted to Line Processing Unit, Line Processing Unit postpones to be transmitted to master clock after request message generates the 3rd delay request message according to second, then the first delayed response message that master clock sends is received, the time of last Main Processor Unit calibration Main Processor Unit.Technique scheme contributes to reducing Line Processing Unit taking software resource and hardware resource.
Description
Technical field
The embodiment of the present invention relates to the communication technology, particularly relates to a kind of method and the network equipment that carry out time synchronized based on precision time protocol.
Background technology
Precision time protocol (Precision Time Protocol, PTP) is widely used in the network equipment.PTP defines master clock and the rules of interaction from clock.
In existing network, master clock and the network equipment from clock place can comprise Line Processing Unit (line processing unit, LPU) and Main Processor Unit (main processing unit, MPU).
Comprising in the scene of Line Processing Unit and Main Processor Unit from clock, master clock with from the reciprocal process of clock can be: master clock, with mutual from the Line Processing Unit of clock, obtains T1, T2, T3 and T4 from clock.T1, T2, T3 and T4 be sent to the Main Processor Unit from clock from the Line Processing Unit of clock.Main Processor Unit calibrates the time of Main Processor Unit according to T1, T2, T3 and T4.In technique scheme, structure is needed to postpone request (delay_request) message from the Line Processing Unit of clock.
In the scene that master clock comprises Line Processing Unit and Main Processor Unit, master clock with from the reciprocal process of clock can be: from the Line Processing Unit of clock and master clock alternately, obtain T1, T2, T3 and T4 from clock.From clock according to the time of T1, T2, T3 and T4 calibration from clock.In technique scheme, the Line Processing Unit of master clock needs synchronous (sync) message of structure.
In technique scheme, the software resource that Line Processing Unit takies and hardware resource more.
Summary of the invention
The embodiment of the present invention provides a kind of method and the network equipment that carry out time synchronized based on precision time protocol, contributes to reducing Line Processing Unit taking software resource and hardware resource.
First aspect, provides a kind of method of carrying out time synchronized based on precision time protocol, comprising:
The first sync message that master clock sends arrives the first physical port of the Line Processing Unit of the network equipment, wherein, described first physical port is transparent clock (transparent clock, TC) inbound port, original time stamp territory (OriginTS) of described first sync message carries the first sync message from the time t1 that master clock sends, and described Line Processing Unit generates the second sync message according to described first sync message;
Described Line Processing Unit forwards described second sync message to the Main Processor Unit of the described network equipment;
Described second sync message arrives the second physical port of described Main Processor Unit, described second physical port is the outbound port of described transparent clock, described Main Processor Unit generates the 3rd sync message according to described second sync message, and the correction territory (correction field) of described 3rd sync message carries very first time interval;
The time that described 3rd sync message arrives the 3rd physical port of described Main Processor Unit is t2, and described Main Processor Unit generates first according to described 3rd sync message and postpones request message, and the described first rise time postponing request message was t3;
Described first postpones request message arrives described second physical port, and described second physical port is the inbound port of described transparent clock, and described Main Processor Unit postpones request message according to described first and generates the second delay request message;
Described Main Processor Unit forwards described second to described Line Processing Unit and postpones request message;
Described second postpones request message arrives described first physical port, described first physical port is the outbound port of described transparent clock, described Line Processing Unit postpones request message according to described second and generates the 3rd delay request message, and the described 3rd correction territory postponing request message carried for second time interval;
Described Line Processing Unit forwards the described 3rd to described master clock and postpones request message;
Described Line Processing Unit receives the first delayed response (delay_resp) message that described master clock sends, first delayed response message the corresponding described 3rd postpones request message, in correction territory carrying described second time interval in described first delayed response message, the original time stamp territory carrying the 3rd of described first delayed response message postpones the time t4 that request message reaches master clock;
Described Main Processor Unit calibrates the time of described Main Processor Unit according to described t1, t2, t3, t4, very first time interval and second time interval, and described Main Processor Unit is from clock.
In technique scheme, the inbound port of transparent clock is positioned at Line Processing Unit, and the outbound port of transparent clock is positioned at Main Processor Unit.After Line Processing Unit receives sync message by the first physical port, Line Processing Unit has carried out transparent transmission to sync message.After Main Processor Unit structure postpones request message, transparent clock has carried out transparent transmission to delay request message.Therefore, in technique scheme, Line Processing Unit does not construct delay request message.The entity that structure postpones request message needs to possess corresponding software resource and hardware resource.In prior art, Line Processing Unit needs structure to postpone request message.Therefore, technique scheme contributes to reducing Line Processing Unit taking software resource and hardware resource.
In conjunction with first aspect, in the first possible execution mode of first aspect, described second physical port and described 3rd physical port are same physical port.
In conjunction with the first possible execution mode of first aspect or first aspect, in the execution mode that the second of first aspect is possible, described first physical port is the outward service port of the described network equipment.
Second aspect, provides a kind of method of carrying out time synchronized based on precision time protocol, comprising:
The Main Processor Unit of master clock generates the first sync message, the original time stamp territory carrying t1 of described first sync message;
Described first sync message arrives the first physical port of described Main Processor Unit, and described first physical port is the inbound port of transparent clock, and described Main Processor Unit generates the second sync message according to described first sync message;
Described Main Processor Unit forwards described second sync message to the Line Processing Unit of described master clock;
Described second sync message arrives the second physical port of described Line Processing Unit, described second physical port is the outbound port of described transparent clock, described Line Processing Unit generates the 3rd sync message according to described second sync message, the carrying very first time interval, correction territory of described 3rd sync message;
Described Line Processing Unit to from the 3rd sync message described in clock-forwarding, described 3rd sync message arrive described from the time of clock be t2;
Described the first delay request message sent from clock arrives described second physical port, the described time postponing request message from clock transmission described first is t3, described second physical port is the inbound port of described transparent clock, described Line Processing Unit postpones request message according to described first and generates the second delay request message, and described first postpones corresponding described 3rd sync message of request message;
Described Line Processing Unit forwards described second to described Main Processor Unit and postpones request message;
Described second postpones request message arrives described first physical port, described first physical port is the outbound port of described transparent clock, described Main Processor Unit postpones request message according to described second and generates the 3rd delay request message, and the described 3rd correction territory postponing request message carried for second time interval;
The time that described 3rd delay request message arrives the 3rd physical port of described Main Processor Unit is t4, described Main Processor Unit postpones request message according to the described the 3rd and generates the first delayed response message, the original time stamp territory of described first delayed response message carries described t4, correction territory carrying described second time interval of described first delayed response message;
Described Main Processor Unit to described from the first delayed response message described in clock-forwarding, with make described from clock according to described t1, t2, t3, t4, described very first time interval and the described second time interval calibration described time from equipment.
In technique scheme, the inbound port of transparent clock is positioned at Main Processor Unit, and the outbound port of transparent clock is positioned at Line Processing Unit.After Main Processor Unit structure sync message, sync message, from entering the first physical port of Main Processor Unit in the process of the second physical port leaving Line Processing Unit, achieves transparent transmission.From the delay request message of clock configuration from entering the second physical port of Line Processing Unit to the process of the first physical port leaving Main Processor Unit, achieve transparent transmission.Therefore, in technique scheme, Line Processing Unit does not construct sync message.The entity of structure sync message needs to possess corresponding software resource and hardware resource.In prior art, Line Processing Unit needs to construct sync message.Therefore, technique scheme contributes to reducing Line Processing Unit taking software resource and hardware resource.
In conjunction with second aspect, in the first possible execution mode of second aspect, described second physical port and described 3rd physical port are same physical port.
In conjunction with the first possible execution mode of second aspect or second aspect, in the execution mode that the second of second aspect is possible, described second physical port is the outward service port of the described network equipment.
The third aspect, provides a kind of network equipment, comprises Line Processing Unit and Main Processor Unit;
Described Line Processing Unit comprises:
First generates subelement, for what send according to master clock, the first sync message arriving the first physical port of the described Line Processing Unit of the described network equipment generates the second sync message, described first physical port is the inbound port of transparent clock, and the original time stamp territory of described first sync message carries the first sync message from the time t1 that master clock sends;
First forwards subelement, for forwarding described second sync message that described first generation unit generates to the described Main Processor Unit of the described network equipment;
Described Main Processor Unit comprises:
Second generates subelement, for what forward according to described first forwarding subelement, described second sync message arriving the second physical port of described Main Processor Unit generates the 3rd sync message, described second physical port is the outbound port of described transparent clock, the carrying very first time interval, correction territory of described 3rd sync message;
3rd generates subelement, described 3rd sync message for generating subelement generation according to described second generates first and postpones request message, the time that described 3rd sync message arrives the 3rd physical port of described Main Processor Unit is t2, and the described first rise time postponing request message was t3;
4th generates subelement, and for what generate according to described 3rd generation subelement, the described first delay request message arriving described second physical port generates second and postpones request message, and described second physical port is the inbound port of described transparent clock;
Second forwards subelement, for forwarding the described second delay request message that the described 4th generates subelement generation to described Line Processing Unit;
Described Line Processing Unit also comprises:
5th generates subelement, for what generate according to described second forwarding subelement, arrive described second of described first physical port and postpone request message generation the 3rd delay request message, described first physical port is the outbound port of described transparent clock, and the described 3rd correction territory postponing request message carried for second time interval;
3rd forwards subelement, for forwarding the described 3rd delay request message that the described 5th generates subelement generation to described master clock;
Receive subelement, for receiving the first delayed response message that described master clock sends, first delayed response message the corresponding described 3rd postpones request message, in correction territory carrying described second time interval in described first delayed response message, the original time stamp territory carrying the 3rd of described first delayed response message postpones the time t4 that request message reaches master clock;
Described Main Processor Unit also comprises:
Calibration subelement, for calibrating the time of described Main Processor Unit according to described t1, t2, t3, t4, very first time interval and second time interval, described Main Processor Unit is from clock.
In technique scheme, the inbound port of transparent clock is positioned at Line Processing Unit, and the outbound port of transparent clock is positioned at Main Processor Unit.After Line Processing Unit receives sync message by the first physical port, Line Processing Unit has carried out transparent transmission to sync message.After Main Processor Unit structure postpones request message, transparent clock has carried out transparent transmission to delay request message.Therefore, in technique scheme, Line Processing Unit does not construct delay request message.The entity that structure postpones request message needs to possess corresponding software resource and hardware resource.In prior art, Line Processing Unit needs structure to postpone request message.Therefore, technique scheme contributes to reducing Line Processing Unit taking software resource and hardware resource.
In conjunction with the third aspect, in the first possible execution mode of the third aspect, described second physical port and described 3rd physical port are same physical port.
In conjunction with the first possible execution mode of the third aspect or the third aspect, in the execution mode that the second of the third aspect is possible, described first physical port is the outward service port of the described network equipment.
Fourth aspect, provides a kind of network equipment, comprises Main Processor Unit and Line Processing Unit;
Described Main Processor Unit comprises:
First generates subelement, and for generating the first sync message, the original time stamp territory of described first sync message carries the first sync message from the time t1 that master clock sends;
Second generates subelement, and the first sync message generated for generating subelement according to described first of the first physical port arriving described Main Processor Unit generates the second sync message, and described first physical port is the inbound port of transparent clock;
First forwards subelement, for forwarding to the Line Processing Unit of described master clock the second sync message that described second generates subelement generation;
Described Line Processing Unit comprises:
3rd generates subelement, the second sync message forwarded for forwarding subelement according to described first of the second physical port arriving described Line Processing Unit generates the 3rd sync message, the carrying very first time interval, correction territory of described 3rd sync message, described second physical port is the outbound port of described transparent clock;
Second forwards subelement, for from the 3rd generating the 3rd sync message that subelement generates described in clock-forwarding, described 3rd sync message arrive described from the time of clock be t2;
4th generates subelement, request message is postponed for generating second according to described the first delay request message that send from clock, that arrive described second physical port, described first postpones corresponding described 3rd sync message of request message, and the described time postponing request message from clock transmission described first is t3;
3rd forwards subelement, postpones request message for forwarding described second to described Main Processor Unit;
Described Main Processor Unit also comprises:
5th generates subelement, the 3rd delay request message is generated for postponing request message according to arrive described first physical port described second, described first physical port is the outbound port of described transparent clock, and the described 3rd correction territory postponing request message carried for second time interval;
6th generates subelement, generate for generating subelement according to the described 5th of the 3rd physical port arriving described Main Processor Unit the 3rd postpones request message generates the first delayed response message, the time that described 3rd delay request message arrives the 3rd physical port of described Main Processor Unit is t4, the original time stamp territory of described first delayed response message carries described t4, correction territory carrying described second time interval of described first delayed response message;
4th forwards subelement, for described from the 6th generating the first delayed response message that subelement generates described in clock-forwarding, with make described from clock according to described t1, t2, t3, t4, described very first time interval and the described second time interval calibration described time from equipment.
In technique scheme, the inbound port of transparent clock is positioned at Main Processor Unit, and the outbound port of transparent clock is positioned at Line Processing Unit.After Main Processor Unit structure sync message, sync message, from entering the first physical port of Main Processor Unit in the process of the second physical port leaving Line Processing Unit, achieves transparent transmission.From the delay request message of clock configuration from entering the second physical port of Line Processing Unit to the process of the first physical port leaving Main Processor Unit, achieve transparent transmission.Therefore, in technique scheme, Line Processing Unit does not construct sync message.The entity of structure sync message needs to possess corresponding software resource and hardware resource.In prior art, Line Processing Unit needs to construct sync message.Therefore, technique scheme contributes to reducing Line Processing Unit taking software resource and hardware resource.
In conjunction with fourth aspect, in the first possible execution mode of fourth aspect, described second physical port and described 3rd physical port are same physical port.
In conjunction with the first possible execution mode of fourth aspect or fourth aspect, in the execution mode that the second of fourth aspect is possible, described second physical port is the outward service port of the described network equipment.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
A kind of schematic flow sheet carrying out the method for time synchronized based on precision time protocol that Fig. 1 provides for the embodiment of the present invention;
A kind of schematic flow sheet carrying out the method for time synchronized based on precision time protocol that Fig. 2 provides for the embodiment of the present invention;
The structural representation of the network equipment for performing the method shown in the method shown in Fig. 1 or Fig. 2 that Fig. 3 provides for the embodiment of the present invention;
A kind of schematic flow sheet carrying out the method for time synchronized based on precision time protocol that Fig. 4 provides for the embodiment of the present invention;
The schematic flow sheet of the path delay of sync message and the path delay of delay_request message in method shown in determination Fig. 4 that Fig. 5 provides for the embodiment of the present invention;
The structural representation of a kind of network equipment that Fig. 6 provides for the embodiment of the present invention;
The structural representation of a kind of network equipment that Fig. 7 provides for the embodiment of the present invention.
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
A kind of schematic flow sheet carrying out the method for time synchronized based on precision time protocol that Fig. 1 provides for the embodiment of the present invention.As shown in Figure 1, described method comprises:
The first sync message that S101, master clock send arrives the first physical port of the Line Processing Unit of the network equipment, wherein, first physical port is the inbound port of transparent clock, the original time stamp territory of the first sync message carries the first sync message from the time t1 that master clock sends, and Line Processing Unit generates the second sync message according to the first sync message.
For example, the network equipment can be router, switch, message transport network (packet transportnetwork, hereinafter referred to as: PTN) device, multi-service transport platform (multi-service transmissionplatform, hereinafter referred to as: MSTP) (wavelength divisionmultiplexing, hereinafter referred to as WDM) device for device or wavelength division multiplexing.First physical port can be physical chip (PHY), also can be field programmable gate array (field programmable gate array, FPGA).
S102, Line Processing Unit forward the second sync message to the Main Processor Unit of the network equipment.
S103, the second sync message arrive the second physical port of Main Processor Unit, and the second physical port is the outbound port of transparent clock, and Main Processor Unit generates the 3rd sync message according to the second sync message, the carrying very first time interval, correction territory of the 3rd sync message.
The time that S104, the 3rd sync message arrive the 3rd physical port of Main Processor Unit is t2, and Main Processor Unit generates first according to the 3rd sync message and postpones request message, and the first rise time postponing request message was t3.
S105, first postpones request message and arrives the second physical port, and the second physical port is the inbound port of transparent clock, and Main Processor Unit postpones request message according to first and generates the second delay request message.
S106, Main Processor Unit forward second to Line Processing Unit and postpone request message.
S107, second postpones request message and arrives the first physical port, first physical port is the outbound port of transparent clock, Line Processing Unit postpones request message according to second and generates the 3rd delay request message, and the 3rd correction territory postponing request message carried for second time interval.
S108, Line Processing Unit forward the 3rd to master clock and postpone request message.
S109, Line Processing Unit receive the first delayed response message that master clock sends, first delayed response message the corresponding 3rd postpones request message, correction territory in first delayed response message carried for second time interval, and the original time stamp territory carrying the 3rd of the first delayed response message postpones the time t4 that request message reaches master clock.
S110, Main Processor Unit calibrate the time of Main Processor Unit according to t1, t2, t3, t4, very first time interval and second time interval, and Main Processor Unit is from clock.
Described Main Processor Unit be described master clock corresponding from clock.
In technique scheme, the inbound port of transparent clock is positioned at Line Processing Unit, and the outbound port of transparent clock is positioned at Main Processor Unit.After Line Processing Unit receives sync message by the first physical port, Line Processing Unit has carried out transparent transmission to sync message.After Main Processor Unit structure postpones request message, transparent clock has carried out transparent transmission to delay request message.Therefore, in technique scheme, Line Processing Unit does not construct delay request message.The entity that structure postpones request message needs to possess corresponding software resource and hardware resource.In prior art, Line Processing Unit needs structure to postpone request message.Therefore, technique scheme contributes to reducing Line Processing Unit taking software resource and hardware resource.
Alternatively, in the method shown in Fig. 1, the second physical port and the 3rd physical port are same physical port.
Alternatively, in the method shown in Fig. 1, the first physical port is the outward service port of the network equipment.
A kind of schematic flow sheet carrying out the method for time synchronized based on precision time protocol that Fig. 2 provides for the embodiment of the present invention.As shown in Figure 2, described method comprises:
The Main Processor Unit of S201, master clock generates the first sync message, and the original time stamp territory of the first sync message carries the first sync message from the time t1 that master clock sends.
For example, master clock can be router, switch, PTN device, MSTP device or WDM device.
S202, the first sync message arrive the first physical port of Main Processor Unit, and the first physical port is the inbound port of transparent clock, and Main Processor Unit generates the second sync message according to the first sync message.
S203, Main Processor Unit forward the second sync message to the Line Processing Unit of master clock.
S204, the second sync message arrive the second physical port of Line Processing Unit, second physical port is the outbound port of transparent clock, Line Processing Unit generates the 3rd sync message according to the second sync message, the carrying very first time interval, correction territory of the 3rd sync message.
S205, Line Processing Unit to from clock-forwarding the 3rd sync message, the 3rd sync message arrive from the time of clock be t2.
S206, from clock send first postpone request message arrive the second physical port, sending for the first time postponing request message from clock is t3, second physical port is the inbound port of transparent clock, Line Processing Unit postpones request message according to first and generates the second delay request message, and first postpones corresponding 3rd sync message of request message.
S207, Line Processing Unit forward second to Main Processor Unit and postpone request message.
S208, second postpones request message and arrives the first physical port, first physical port is the outbound port of transparent clock, Main Processor Unit postpones request message according to second and generates the 3rd delay request message, and the 3rd correction territory postponing request message carried for second time interval.
The time that S209, the 3rd postpones the 3rd physical port of request message arrival Main Processor Unit is t4, Main Processor Unit postpones request message according to the 3rd and generates the first delayed response message, the original time stamp territory carrying t4 of the first delayed response message, the correction territory of the first delayed response message carried for second time interval.
S210, Main Processor Unit are to from clock-forwarding first delayed response message, and to make from clock according to t1, t2, t3, t4, very first time interval and second time interval calibrate the time from equipment.
In the above-described embodiments, the second physical port and described 3rd physical port are same physical port.First physical port is the outward service port of the network equipment, and outward service port can bearer service, and can be accessed by other network equipments.
In technique scheme, the inbound port of transparent clock is positioned at Main Processor Unit, and the outbound port of transparent clock is positioned at Line Processing Unit.After Main Processor Unit structure sync message, sync message, from entering the first physical port of Main Processor Unit in the process of the second physical port leaving Line Processing Unit, achieves transparent transmission.From the delay request message of clock configuration from entering the second physical port of Line Processing Unit to the process of the first physical port leaving Main Processor Unit, achieve transparent transmission.Therefore, in technique scheme, Line Processing Unit does not construct sync message.The entity of structure sync message needs to possess corresponding software resource and hardware resource.In prior art, Line Processing Unit needs to construct sync message.Therefore, technique scheme contributes to reducing Line Processing Unit taking software resource and hardware resource.
Alternatively, in the method described in Fig. 2, the second physical port and the 3rd physical port are same physical port.
Alternatively, in the method described in Fig. 2, the second physical port is the outward service port of the network equipment.
The structural representation of the network equipment for performing the method shown in Fig. 1 or Fig. 2 that Fig. 3 provides for the embodiment of the present invention.As shown in Figure 3, this network equipment comprises central plate and subcard.Main Processor Unit in central plate corresponding diagram 1 or the method shown in Fig. 2, the Line Processing Unit in subcard corresponding diagram 1 or the method shown in Fig. 2.See Fig. 3, subcard is configured with the daughter card side module of physical chip (PHY) and transparent clock.Central plate is configured with central plate side form block and the central plate processing module of transparent clock.Transparent clock comprises daughter card side module and central plate side form block.Daughter card side module, central plate side form block and central plate processing module all support PTP.
Hereafter the process network equipment shown in key diagram 3 being performed to the method shown in Fig. 1 is described in detail.The first sync message that subcard is sent by the port accepts master clock of physical chip.Daughter card side module on subcard carries out message identification to the first sync message received and time stamp generates.First sync message is sent to central plate.Central plate side form block on central plate and central plate module complete time stamp generation, packet parsing, message termination, message generation, the time stamp pairing of message and manage process concentratedly.Central plate processing module and central plate side form block postpone request message by the generate the 3rd and are sent to master clock through subcard.In technique scheme, transparent clock comprises subcard.Subcard does not need to perform time stamp passback.Therefore, relative to prior art, technique scheme reduces hardware requirement and the implementation complexity of subcard.
The schematic flow sheet of a kind of implementation that Fig. 4 is the method shown in Fig. 1.The schematic flow sheet of the path delay that Fig. 5 is the path delay and delay_request message of determining sync message in the implementation shown in Fig. 4.As shown in Figure 4, described implementation can comprise:
S301, master clock send sync message, i.e. the first sync message.Carry sync message departure time t1 in the original time stamp territory of sync message, the value revising territory CF is 0.
The sync message that S302, master clock send arrives the first physical port of the Line Processing Unit of the network equipment.Line Processing Unit determines the time t2j of arrival first physical port, is got by t2j after bearing and is added in the correction territory CF of sync message, form the second sync message.Second sync message is supplied to the Main Processor Unit from clock by Line Processing Unit.
S303, the second sync message arrive the second physical port of Main Processor Unit, and the second physical port is the outbound port of transparent clock.Main Processor Unit determines the time t2 reaching the second physical port, is added into by t2 in the correction territory CF of message.
S304, Main Processor Unit generate the 3rd sync message according to the second sync message, the carrying of correction territory very first time interval, the i.e.-t2j+t2 of the 3rd sync message.Main Processor Unit is resolved and is obtained sync message departure time t1 from the time-domain of the 3rd sync message, resolves and obtain very first time interval from correction territory.
The time that S305, the 3rd sync message arrive the 3rd physical port of Main Processor Unit is t2.Main Processor Unit generates first according to the 3rd sync message and postpones request message, i.e. delay_request message.First rise time postponing request message was t3.
In the present embodiment, the 3rd physical port and the second physical port are same port, so the time reached is t2.
S306, first postpones request message and arrives the second physical port, and the second physical port is the inbound port of transparent clock.Main Processor Unit postpones request message according to first and generates second and postpone request message, with delay_request message departure time t3 get negative after be added in the correction territory CF of delay_request message.The time that the sends t3 of delay_request message is carried in original time stamp territory.
S307, Main Processor Unit forward second to Line Processing Unit and postpone request message.
S308, second postpones request message and arrives the first physical port, and the first physical port is the outbound port of transparent clock.Line Processing Unit determines that the time of arrival first physical port is t3j, is added in the correction territory CF of delay_request message by the second time t3j.Line Processing Unit postpones request message according to second and generates the 3rd delay request message, and the 3rd correction territory postponing request message carried for second time interval, i.e. t3-t3j.
S309, Line Processing Unit forward the 3rd to master clock and postpone request message.
S310, Line Processing Unit receive the first delayed response message that master clock sends, i.e. delay_resp message.First delayed response message the corresponding 3rd postpones request message, and the correction territory in the first delayed response message carried for second time interval, and the original time stamp territory carrying the 3rd of the first delayed response message postpones the time t4 that request message reaches master clock.
Resolve the time-domain of the delay_resp message that S3 11, Main Processor Unit return from master clock and obtain the delay_request message t4 time of advent, from the correction territory of delay_resp message, obtained for second time interval, i.e. t3j-t3.
S312, Main Processor Unit calibrate the time of Main Processor Unit according to t1, t2, t3, t4, very first time interval and second time interval, i.e. path delay=the t2-t1-(t2-t2j of sync message) path delay=t4-(the t3j-t3)-t3=t4-t3j of=t2j-t1, delay_request message.
S313, carry out clock and time synchronized from clock according to the path delay t2j-t1 of sync message and the path delay t4-t3j of delay_request message.
One of ordinary skill in the art will appreciate that: all or part of step realizing above-mentioned each embodiment of the method can have been come by the hardware that program command is relevant.Aforesaid program can be stored in a computer read/write memory medium.This program, when performing, performs the step comprising above-mentioned each embodiment of the method; And aforesaid storage medium comprises: ROM, RAM, magnetic disc or CD etc. various can be program code stored medium.
The structural representation of a kind of network equipment that Fig. 6 provides for the embodiment of the present invention.The described network equipment may be used for the method shown in Fig. 1 that performs.As shown in Figure 6, the described network equipment comprises: Line Processing Unit 11 and Main Processor Unit 12.
Line Processing Unit 11 comprises the first generation subelement 110 and first and forwards subelement 111.
First generates subelement 110 for send according to master clock, the first sync message arriving the first physical port of the Line Processing Unit 11 of the network equipment generates the second sync message, first physical port is the inbound port of transparent clock, and the original time stamp territory of the first sync message carries the first sync message from the time t1 that master clock sends.
For example, the first generation subelement 110 can be processor.
First forwards subelement 111 for forwarding the second sync message of the first generation subelement 110 generation to the Main Processor Unit 12 of the network equipment.
For example, the first forwarding subelement 111 can be transmitter.
Main Processor Unit 12 comprises the second generation subelement 120, the 3rd and generates subelement 121, the 4th generation subelement 122 and the second forwarding subelement 123.
Second generate subelement 120 for according to first forward subelement 111 forward, the second sync message arriving the second physical port of Main Processor Unit 12 generates the 3rd sync message, second physical port is the outbound port of transparent clock, the carrying very first time interval, correction territory of the 3rd sync message.
3rd generates subelement 121 generates the first delay request message for the 3rd sync message generating subelement 120 generation according to second, the time that 3rd sync message arrives the 3rd physical port of Main Processor Unit 12 is t2, and the first rise time postponing request message was t3.
4th generates subelement 122 for generating raw 121 one-tenths of subelement according to the 3rd, and arrive first of the second physical port and postpone request message and generate the second delay request message, the second physical port is the inbound port of transparent clock.
Second forwards subelement 123 for forwarding the second delay request message that the 4th generates subelement 122 generation to Line Processing Unit 11.
For example, the second forwarding subelement 123 can be transmitter.
As shown in Figure 6, Line Processing Unit 11 also comprises the 5th and generates subelement 112, the 3rd forwarding subelement 113 and receive subelement 114, wherein,
5th generate subelement 112 for according to second forward subelement 123 generate, arrive second of the first physical port and postpone request message generation the 3rd delay request message, first physical port is the outbound port of transparent clock, and the 3rd correction territory postponing request message carried for second time interval.
3rd forwards subelement 113 for forwarding the 3rd delay request message that the 5th generates subelement 112 generation to master clock.
Receive the first delayed response message that subelement 114 sends for receiving master clock, first delayed response message the corresponding 3rd postpones request message, correction territory in first delayed response message carried for second time interval, and the original time stamp territory carrying the 3rd of the first delayed response message postpones the time t4 that request message reaches master clock.
For example, receiving subelement 114 can be receiver.
Main Processor Unit 12 also comprises calibration subelement 124, and this calibration subelement 124 is for calibrating the time of Main Processor Unit 12 according to t1, t2, t3, t4, very first time interval and second time interval, Main Processor Unit 12 is from clock.
In above-described embodiment, the second physical port and the 3rd physical port are same physical port.First physical port is the outward service port of the network equipment.
The structural representation of a kind of network equipment that Fig. 7 provides for the embodiment of the present invention.The described network equipment may be used for the method shown in Fig. 2 that performs.As shown in Figure 7, the described network equipment comprises: Main Processor Unit 21 and Line Processing Unit 22.
Main Processor Unit 21 comprises the first generation subelement 210, second and generates subelement 211 and the first forwarding subelement 212.
First generates subelement 210 for generating the first sync message, and the original time stamp territory of the first sync message carries the first sync message from the time t1 that master clock sends.
Second generates subelement 211 generates the second sync message for the first sync message generating subelement 210 generation according to first of the first physical port arriving Main Processor Unit 21, and the first physical port is the inbound port of transparent clock.
First forwards subelement 212 for forwarding the second sync message of the second generation subelement 211 generation to the Line Processing Unit 22 of master clock.
For example, described first forwarding subelement 212 can be transmitter.
Line Processing Unit 22 comprises the 3rd and generates subelement 220, second forwarding subelement 221, the 4th generation subelement 222 and the 3rd forwarding subelement 223.
3rd generates subelement 220 generates the 3rd sync message for the second sync message forwarding subelement 212 forwarding according to first of the second physical port arriving Line Processing Unit 22, the carrying very first time interval, correction territory of the 3rd sync message, the second physical port is the outbound port of transparent clock.
Second forwards subelement 221 for generating the 3rd sync message of subelement 220 generation from clock-forwarding the 3rd, and the 3rd sync message arrival is t2 from the time of clock.
For example, described second forwarding subelement 221 can be transmitter.
4th generates the first delay request message generation second that subelement 222 sends from clock for basis, that arrive the second physical port postpones request message, first postpones corresponding 3rd sync message of request message, and sending for the first time postponing request message from clock is t3.
3rd forwards subelement 223 for forwarding the second delay request message that the 4th generates subelement 222 generation to Main Processor Unit 21.
For example, described 3rd forwarding subelement 223 can be transmitter.
As shown in Figure 7, Main Processor Unit 21 also comprises the 5th generation subelement 213, the 6th generation subelement 214 and the 4th forwarding subelement 215.
5th generates subelement 213 postpones request message for the second delay request message generation the 3rd forwarding subelement 223 forwarding according to the 3rd of arrival first physical port, first physical port is the outbound port of transparent clock, and the 3rd correction territory postponing request message carried for second time interval.
6th generates subelement 214 generates the first delayed response message for the 3rd delay request message generating subelement 213 generation according to the 5th of the 3rd physical port arriving Main Processor Unit 21,3rd time postponing the 3rd physical port of request message arrival Main Processor Unit 21 was t4, the original time stamp territory carrying t4 of the first delayed response message, the correction territory of the first delayed response message carried for second time interval.
4th forwards subelement 215 for the first delayed response message generating subelement 214 generation from clock-forwarding the 6th, and to make from clock according to t1, t2, t3, t4, very first time interval and second time interval calibrate the time from equipment.
For example, in above-described embodiment, the second physical port and the 3rd physical port can be same physical port.
For example, the second physical port can be the outward service port of the network equipment.
Claims (12)
1. carry out a method for time synchronized based on precision time protocol, it is characterized in that, comprising:
The first sync message that master clock sends arrives the first physical port of the Line Processing Unit of the network equipment, wherein, described first physical port is the inbound port of transparent clock, the original time stamp territory of described first sync message carries the first sync message from the time t1 that master clock sends, and described Line Processing Unit generates the second sync message according to described first sync message;
Described Line Processing Unit forwards described second sync message to the Main Processor Unit of the described network equipment;
Described second sync message arrives the second physical port of described Main Processor Unit, described second physical port is the outbound port of described transparent clock, described Main Processor Unit generates the 3rd sync message according to described second sync message, the carrying very first time interval, correction territory of described 3rd sync message;
The time that described 3rd sync message arrives the 3rd physical port of described Main Processor Unit is t2, and described Main Processor Unit generates first according to described 3rd sync message and postpones request message, and the described first rise time postponing request message was t3;
Described first postpones request message arrives described second physical port, and described second physical port is the inbound port of described transparent clock, and described Main Processor Unit postpones request message according to described first and generates the second delay request message;
Described Main Processor Unit forwards described second to described Line Processing Unit and postpones request message;
Described second postpones request message arrives described first physical port, described first physical port is the outbound port of described transparent clock, described Line Processing Unit postpones request message according to described second and generates the 3rd delay request message, and the described 3rd correction territory postponing request message carried for second time interval;
Described Line Processing Unit forwards the described 3rd to described master clock and postpones request message;
Described Line Processing Unit receives the first delayed response message that described master clock sends, first delayed response message the corresponding described 3rd postpones request message, in correction territory carrying described second time interval in described first delayed response message, the original time stamp territory carrying the 3rd of described first delayed response message postpones the time t4 that request message reaches master clock;
Described Main Processor Unit calibrates the time of described Main Processor Unit according to described t1, t2, t3, t4, very first time interval and second time interval, and described Main Processor Unit is from clock.
2. method according to claim 1, is characterized in that,
Described second physical port and described 3rd physical port are same physical port.
3. method according to claim 1 and 2, is characterized in that,
Described first physical port is the outward service port of the described network equipment.
4. carry out a method for time synchronized based on precision time protocol, it is characterized in that, comprising:
The Main Processor Unit of master clock generates the first sync message, and the original time stamp territory of described first sync message carries the first sync message from the time t1 that master clock sends;
Described first sync message arrives the first physical port of described Main Processor Unit, and described first physical port is the inbound port of transparent clock, and described Main Processor Unit generates the second sync message according to described first sync message;
Described Main Processor Unit forwards described second sync message to the Line Processing Unit of described master clock;
Described second sync message arrives the second physical port of described Line Processing Unit, described second physical port is the outbound port of described transparent clock, described Line Processing Unit generates the 3rd sync message according to described second sync message, the carrying very first time interval, correction territory of described 3rd sync message;
Described Line Processing Unit to from the 3rd sync message described in clock-forwarding, described 3rd sync message arrive described from the time of clock be t2;
Described the first delay request message sent from clock arrives described second physical port, the described time postponing request message from clock transmission described first is t3, described second physical port is the inbound port of described transparent clock, described Line Processing Unit postpones request message according to described first and generates the second delay request message, and described first postpones corresponding described 3rd sync message of request message;
Described Line Processing Unit forwards described second to described Main Processor Unit and postpones request message;
Described second postpones request message arrives described first physical port, described first physical port is the outbound port of described transparent clock, described Main Processor Unit postpones request message according to described second and generates the 3rd delay request message, and the described 3rd correction territory postponing request message carried for second time interval;
The time that described 3rd delay request message arrives the 3rd physical port of described Main Processor Unit is t4, described Main Processor Unit postpones request message according to the described 3rd and generates the first delayed response message, the original time stamp territory of described first delayed response message carries described t4, correction territory carrying described second time interval of described first delayed response message;
Described Main Processor Unit to described from the first delayed response message described in clock-forwarding, with make described from clock according to described t1, t2, t3, t4, described very first time interval and described second time interval calibration are from the time of equipment.
5. method according to claim 4, is characterized in that,
Described second physical port and described 3rd physical port are same physical port.
6. the method according to claim 4 or 5, is characterized in that,
Described second physical port is the outward service port of the network equipment.
7. a network equipment, is characterized in that, comprises Line Processing Unit and Main Processor Unit;
Described Line Processing Unit comprises:
First generates subelement, for what send according to master clock, the first sync message arriving the first physical port of the described Line Processing Unit of the described network equipment generates the second sync message, described first physical port is the inbound port of transparent clock, and the original time stamp territory of described first sync message carries the first sync message from the time t1 that master clock sends;
First forwards subelement, for forwarding to the described Main Processor Unit of the described network equipment described second sync message that described first generates subelement generation;
Described Main Processor Unit comprises:
Second generates subelement, for what forward according to described first forwarding subelement, described second sync message arriving the second physical port of described Main Processor Unit generates the 3rd sync message, described second physical port is the outbound port of described transparent clock, the carrying very first time interval, correction territory of described 3rd sync message;
3rd generates subelement, described 3rd sync message for generating subelement generation according to described second generates first and postpones request message, the time that described 3rd sync message arrives the 3rd physical port of described Main Processor Unit is t2, and the described first rise time postponing request message was t3;
4th generates subelement, and for what generate according to described 3rd generation subelement, the described first delay request message arriving described second physical port generates second and postpones request message, and described second physical port is the inbound port of described transparent clock;
Second forwards subelement, for forwarding the described second delay request message that the described 4th generates subelement generation to described Line Processing Unit;
Described Line Processing Unit also comprises:
5th generates subelement, for what generate according to described second forwarding subelement, arrive described second of described first physical port and postpone request message generation the 3rd delay request message, described first physical port is the outbound port of described transparent clock, and the described 3rd correction territory postponing request message carried for second time interval;
3rd forwards subelement, for forwarding the described 3rd delay request message that the described 5th generates subelement generation to described master clock;
Receive subelement, for receiving the first delayed response message that described master clock sends, first delayed response message the corresponding described 3rd postpones request message, in correction territory carrying described second time interval in described first delayed response message, the original time stamp territory carrying the 3rd of described first delayed response message postpones the time t4 that request message reaches master clock;
Described Main Processor Unit also comprises:
Calibration subelement, for calibrating the time of described Main Processor Unit according to described t1, t2, t3, t4, very first time interval and second time interval, described Main Processor Unit is from clock.
8. the network equipment according to claim 7, described second physical port and described 3rd physical port are same physical port.
9. the network equipment according to claim 7 or 8, described first physical port is the outward service port of the described network equipment.
10. a network equipment, is characterized in that, comprises Main Processor Unit and Line Processing Unit;
Described Main Processor Unit comprises:
First generates subelement, and for generating the first sync message, the original time stamp territory of described first sync message carries the first sync message from the time t1 that master clock sends;
Second generates subelement, and the first sync message generated for generating subelement according to described first of the first physical port arriving described Main Processor Unit generates the second sync message, and described first physical port is the inbound port of transparent clock;
First forwards subelement, for forwarding to the Line Processing Unit of described master clock the second sync message that described second generates subelement generation;
Described Line Processing Unit comprises:
3rd generates subelement, the second sync message forwarded for forwarding subelement according to described first of the second physical port arriving described Line Processing Unit generates the 3rd sync message, the carrying very first time interval, correction territory of described 3rd sync message, described second physical port is the outbound port of described transparent clock;
Second forwards subelement, for from the 3rd generating the 3rd sync message that subelement generates described in clock-forwarding, described 3rd sync message arrive described from the time of clock be t2;
4th generates subelement, request message is postponed for generating second according to described the first delay request message that send from clock, that arrive described second physical port, described first postpones corresponding described 3rd sync message of request message, and the described time postponing request message from clock transmission described first is t3;
3rd forwards subelement, for forwarding the second delay request message that the described 4th generates subelement generation to described Main Processor Unit;
Described Main Processor Unit also comprises:
5th generates subelement, forward for forwarding subelement according to the arrive described first physical port the described 3rd second postpones request message generation the 3rd postpones request message, described first physical port is the outbound port of described transparent clock, and the described 3rd correction territory postponing request message carried for second time interval;
6th generates subelement, generate for generating subelement according to the described 5th of the 3rd physical port arriving described Main Processor Unit the 3rd postpones request message generates the first delayed response message, the time that described 3rd delay request message arrives the 3rd physical port of described Main Processor Unit is t4, the original time stamp territory of described first delayed response message carries described t4, correction territory carrying described second time interval of described first delayed response message;
4th forwards subelement, for described from the 6th generating the first delayed response message that subelement generates described in clock-forwarding, with make described from clock according to described t1, t2, t3, t4, described very first time interval and described second time interval calibrate the time from equipment.
11. network equipments according to claim 10, described second physical port and described 3rd physical port are same physical port.
12. network equipments according to claim 10 or 11, described second physical port is the outward service port of the described network equipment.
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| CN107579793A (en) * | 2016-07-04 | 2018-01-12 | 中兴通讯股份有限公司 | The optimization method of time synchronized, device and equipment between a kind of communication network device |
| CN109842455B (en) | 2017-11-27 | 2020-06-16 | 华为技术有限公司 | Communication processing method and device |
| CN111837358B (en) * | 2018-03-14 | 2022-01-11 | 华为技术有限公司 | Method and system for time synchronization in network |
| CN111082887B (en) * | 2019-12-03 | 2022-03-18 | 锐捷网络股份有限公司 | System, method, device, equipment and medium for signal transmission delay compensation |
| CN113055113A (en) * | 2019-12-26 | 2021-06-29 | 中兴通讯股份有限公司 | Clock time synchronization method, device, equipment and storage medium |
| CN114745774B (en) * | 2022-03-16 | 2023-05-12 | 烽火通信科技股份有限公司 | Centralized time synchronization method, device, equipment and readable storage medium |
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