CN102340439B - Virtual switching method for IEEE (Institute of Electrical and Electronic Engineers) 1588 equipment - Google Patents
Virtual switching method for IEEE (Institute of Electrical and Electronic Engineers) 1588 equipment Download PDFInfo
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Abstract
The invention discloses a virtual switching method for IEEE (Institute of Electrical and Electronic Engineers) 1588 equipment. The IEEE 1588 equipment is provided with a first Ethernet port and a second Ethernet port, wherein the virtual switching method comprises the following steps of: A. receiving network data by the first Ethernet port; B. judging whether the data received by the first Ethernet port are PTP (Picture Transfer Protocol) messages; if the data are PTP messages, turning into the step C and otherwise, discharging the received data; C. reading accurate current time of a system and writing the accurate time into the received PTP messages; and D. transmitting the amended PPT messages through the second Ethernet port. In the virtual switching method for the IEEE 1588 equipment, which is provided by the invention, a standard Master mode, a standard Slave mode, a Boundary mode and a PTP Switch mode are applied in the realized work mode of the IEEE 1588, thus the virtual switching function of the IEEE 1588 equipment can be achieved.
Description
Technical field
The invention belongs to communication technical field, relate to a kind of IEEE1588 equipment, relate in particular to a kind of virtual switch method of IEEE1588 equipment.
Background technology
Ethernet became after IEEE802.3 standard in 1985, in nineteen ninety-five, data transmission bauds is brought up to the process of 100Mb/s from 10Mb/s, cyber-net industry is also in the problem of being devoted to solve the Timing Synchronization scarce capacity of Ethernet, the NTP (Network Time Protocol) (NTP) of developing a kind of software mode, improves the Timing Synchronization ability between each network equipment.The synchronous accuracy of NTP version in 1992 can reach 200 μ s, but still can not meet the required accuracy of measuring instrument and Industry Control.In order to solve the needs of measuring and controlling the distributed network Timing Synchronization of application, there are the engineers and technicians of the information technology of common interests, automatic control, artificial intelligence, thermometrically in proposal establishment in the end of the year 2000 synchronous committee of network precision interval clock, in calendar year 2001, obtain standard that the support ，Gai committee of national institute of standards and technology of the IEEE instrumentation and testing committee (NIST) drafts and obtain the ieee standard committee by as IEEE1588 standard in the end of the year 2002.
The full name of IEEE1588 is " the precision interval clock synchronous protocol standard of network measure and control system ", is commonly referred to precision time protocol (PTP, Precision Time Protocol).The draft basis of IEEE1588 standard, from the relevant achievement of 1990 to 1998 of Hewlett-Packard, is changed a language and is said, Agilent science and technology is made significant contribution to IEEE1588 standard.The senior fellow John Eidson in Agilent laboratory is considered as expert by network industry, his " IEEE1588 is in the application of test and measuring system ", and " IEEE1588: in observing and controlling and the application of communicating by letter " two pieces of papers have penetrating and comprehensively introduce IEEE1588 agreement.IEEE1588 agreement is the standard of general lifting network system Timing Synchronization ability, in drafting process, mainly with reference to Ethernet, works out, and makes distributed communication network can have strict Timing Synchronization, and is applied to industrial automation system.Basic conception is by hardware and software, the internal clock of the network equipment (client computer) to be realized and being synchronizeed with the master clock of main control computer, provide and be less than the utilization of 10 μ s synchronous settling time, compare with Ethernet μ s time of delays 1000 that does not carry out IEEE1588 agreement, the Timing Synchronization index of whole network is significantly improved.
Digital transformer substation is built pilot work and is made further progress.2009, in digital transformer substation field, to continue to make further progress, 500 kilovolts of newly-built Haining based on IEC61850 become project of transmitting and converting electricity and 500 kilovolts of conventional substations creep change digitlization improvement project respectively at putting into operation in June, 2009, in December, 2009.In fields such as the sampled value Network Transmitting based on IEC61850-9-2, the network application of PTP chronometer time synchronous protocol, digital transformer substation integration testing and dynamic simulation tests, realize multinomial practical engineering application, obtain gratifying achievement in research.Solving, transformer station's integrated informationization is integrated, light instrument transformer, routine transformer coupling, and the key problem aspect in the digital transformer substation evolutions such as conventional substation digitlization transition obtains invaluable experience.
Yet for existing IEEE1588 equipment, equipment user does not also have virtual switch function, cannot analyze by PTP message and the temporal information of exchange.
The weak point of existing PTP equipment is also embodied in:
1, common clock synchronization compliant with precision time protocol (Ordinary Clock) does not have function of exchange;
2, boundary clock (Boundary Clock) does not have function of exchange;
Although 3, general switch can transmit PTP message, do not there is time bias function, cause in network PTP to time precision extremely decline;
4, with the switch (Transparent Clock) of PTP message time bias, commutative PTP message, can carry out time bias to PTP message, but expensive, extremely rare on market; And the overwhelming majority is based on software clock compensation, and precision is not high, only has Millisecond precision.
Summary of the invention
Technical problem to be solved by this invention is: a kind of virtual switch method of IEEE1588 equipment is provided, can realizes the virtual switch function of IEEE1588 equipment.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
A virtual switch method for IEEE1588 equipment, IEEE1588 equipment has the first Ethernet interface, the second Ethernet interface; Described virtual switch method comprises the steps:
A, the first Ethernet interface receive network data;
B, judge whether the data that described the first Ethernet interface receives are PTP messages; If go to step C, otherwise abandon the data that receive;
C, read the current time in system accurately, correct time is write in the PTP message of having received;
The PTP message of D, correction sends by the second Ethernet interface.
As a preferred embodiment of the present invention, described method comprises the steps:
S11, two ethernet ports are set is the PTP LISTENING pattern of stipulating in IEEE1588-2002 standard;
S12, the PTP message that each frame is received, the physical layer in Ethernet agreement, stamps the markers Timestamp of hardware clock;
S13, the Ethernet message analysis that each frame is received, if non-PTPv1 protocol massages abandons, if PTPv1 message carries out next step;
If the delay solicited message DELAY REQUEST MESSAGE of S14 IEEE1588-2002 standard code, this message is modified, do not change the UUID, MAC Address, sequence of message, PTP version information of this message, all message identification information, the hardware markers containing in this message is replaced; During described hardware, be designated as the markers of stamping in step S12; Replace to this message the process of going out from described IEEE1588 device forwards, the hardware markers while being transferred to the physical layer in Ethernet agreement;
If the management information MANAGEMENT MESSAGE of S15 IEEE1588-2002 standard code, this message is modified, do not change the UUID, MAC Address, sequence of message of this message, all message identification information, the hardware markers containing in this message is replaced, during described hardware, be designated as the markers of stamping in step S12; Replace to this message the process of going out from described IEEE1588 device forwards, the hardware markers while being transferred to the physical layer in Ethernet agreement.
As a preferred embodiment of the present invention, described method comprises the steps:
S21, two ethernet ports are set is the PTP LISTENING pattern of stipulating in IEEE1588-2008 standard;
S22, the PTP message that each frame is received, the physical layer in Ethernet agreement, stamps the markers Timestamp of hardware clock;
S23, the Ethernet message analysis that each frame is received, if non-PTPv2 protocol massages abandons, if PTPv2 message carries out next step; If the PTP message that itself forwards abandons too;
If the synchronizing information SYNC MESSAGE of S24 IEEE1588-2008 standard code, first, record the markers T1 that this message comprises, this message is modified, do not change the UUID, MAC Address, sequence of message, PTP version information of this message, all message identification information, while just the markers containing in this message being replaced to described hardware, be designated as the markers of stamping in step S22; Replace to this message the process of going out from described IEEE1588 device forwards, the hardware markers while being transferred to the physical layer in Ethernet agreement, and record this markers T2; Then, calculate this message at described IEEE1588 device interior transmitting procedure time T 3, T3=T2-T1; Finally, if PTPv2 Delay Mode now, in P2P pattern, according to IEEE1588-2008 standard, measures and forwards port to the line loss time T 4 of SLAVE Clock, calculate total losses time T 5, T5=T3+T4.
If there is the FOLLOW UP message of this message, this FOLLOW UP message is modified, only revise the markers that it comprises, its markers is added to total losses time T 5, then this FOLLOW UP message repeating is gone out;
If the delay solicited message DELAY REQUEST MESSAGE (Delay_Req message) of S25 IEEE1588-2008 standard code, first, record the markers T6 that this message comprises, this message is modified, this message is modified, do not change the UUID, MAC Address, sequence of message of this message, all message identification information, while just the hardware markers containing in this message being replaced to described hardware, be designated as the markers of stamping in step S22; Replace to this message the process of going out from described IEEE1588 device forwards, the hardware markers while being transferred to the physical layer in Ethernet agreement, and record this markers T7; Then, calculate this message at described IEEE1588 device interior transmitting procedure time T 8, T8=T7-T6; If there is the FOLLOW UP message of this message, this FOLLOW UP message is modified, only revise the markers that it comprises, its markers is added to time T 8, then this FOLLOW UP message repeating is gone out;
If the DELAY RESPONE MESSAGE (Delay_Resp message) of S26 IEEE1588-2008 standard code, first, record the markers T9 that this message comprises, this message is modified, this message is modified, do not change the UUID, MAC Address, sequence of message of this message, all message identification information, while just the hardware markers containing in this message being replaced to described hardware, be designated as the markers of stamping in step S22; Replace to this message the process of going out from described IEEE1588 device forwards, the hardware markers while being transferred to the physical layer in Ethernet agreement, and record this markers T10; Then, calculate this message at described IEEE1588 device interior transmitting procedure time T 11, T11=T10-T9; If there is the FOLLOW UP message of this message, this FOLLOW UP message is modified, only revise the markers that it comprises, its markers is added to time T 11, then this FOLLOW UP message repeating is gone out.
Beneficial effect of the present invention is: the virtual switch method of the IEEE1588 equipment that the present invention proposes, in the IEEE1588 mode of operation realizing, except Master, the Slave of standard, Boundary, also have PTP Switch pattern, can realize the virtual switch function of IEEE1588 equipment.
PTP message virtual switch in the present invention, carries out time bias based on hardware clock, nanosecond precision; Compatible PTPv1 and PTPv2 really meet IEEE1588 standard.
The present invention is only transmitted, is exchanged PTP message, filters out other Ethernet protocol messages, thereby makes system simple, reduces system load, increases time bias precision.
The present invention is by 2 two-way automatic forwardings of network interface; That is,, when 1588 testers are set to virtual switch, the PTP message that any one network interface receives, after all can compensating in the elapsed time, goes out from another port repeat; Which port need not be additionally set and receive, another port repeat.
Accompanying drawing explanation
Fig. 1 is the flow chart of the inventive method.
Embodiment
Below in conjunction with accompanying drawing, describe the preferred embodiments of the present invention in detail.
Embodiment mono-
Refer to Fig. 1, the present invention has disclosed a kind of virtual switch method of IEEE1588 equipment, and IEEE1588 equipment has the first Ethernet interface, the second Ethernet interface; Described virtual switch method comprises the steps:
A, the first Ethernet interface receive network data;
B, judge whether the data that described the first Ethernet interface receives are PTP messages; If go to step C, otherwise abandon the data that receive;
C, read the current time in system accurately, correct time is write in the PTP message of having received;
The PTP message of D, correction sends by the second Ethernet interface.
PTP agreement comprises PTPv1 version, PTPv2 version, and under PTPv1 version, described method comprises the steps:
S11, two ethernet ports are set is the PTP LISTENING pattern of stipulating in IEEE1588-2002 standard;
S12, the PTP message that each frame is received, the physical layer in Ethernet agreement, stamps the markers Timestamp of hardware clock;
S13, the Ethernet message analysis that each frame is received, if non-PTPv1 protocol massages abandons, if PTPv1 message carries out next step;
If the delay solicited message DELAY REQUEST MESSAGE of S14 IEEE1588-2002 standard code, this message is modified, do not change the UUID, MAC Address, sequence of message, PTP version information of this message, all message identification information, the hardware markers containing in this message is replaced; During described hardware, be designated as the markers of stamping in step S12; Replace to this message the process of going out from described IEEE1588 device forwards, the hardware markers while being transferred to the physical layer in Ethernet agreement;
If the management information MANAGEMENT MESSAGE of S15 IEEE1588-2002 standard code, this message is modified, do not change the UUID, MAC Address, sequence of message of this message, all message identification information, the hardware markers containing in this message is replaced, during described hardware, be designated as the markers of stamping in step S12; Replace to this message the process of going out from described IEEE1588 device forwards, the hardware markers while being transferred to the physical layer in Ethernet agreement.
Under PTPv2 version, described method comprises the steps:
S21, two ethernet ports are set is the PTP LISTENING pattern of stipulating in IEEE1588-2008 standard;
S22, the PTP message that each frame is received, the physical layer in Ethernet agreement, stamps the markers Timestamp of hardware clock;
S23, the Ethernet message analysis that each frame is received, if non-PTPv2 protocol massages abandons, if PTPv2 message carries out next step; If the PTP message that itself forwards abandons too;
If the synchronizing information SYNC MESSAGE of S24 IEEE1588-2008 standard code, first, record the markers T1 that this message comprises, this message is modified, do not change the UUID, MAC Address, sequence of message, PTP version information of this message, all message identification information, while just the markers containing in this message being replaced to described hardware, be designated as the markers of stamping in step S22; Replace to this message the process of going out from described IEEE1588 device forwards, the hardware markers while being transferred to the physical layer in Ethernet agreement, and record this markers T2; Then, calculate this message at described IEEE1588 device interior transmitting procedure time T 3, T3=T2-T1; Finally, if PTPv2 Delay Mode now, in P2P pattern, according to IEEE1588-2008 standard, measures and forwards port to the line loss time T 4 of SLAVE Clock, calculate total losses time T 5, T5=T3+T4.
If there is the FOLLOW UP message of this message, this FOLLOW UP message is modified, only revise the markers that it comprises, its markers is added to total losses time T 5, then this FOLLOW UP message repeating is gone out;
If the delay solicited message DELAY REQUEST MESSAGE (Delay_Req message) of S25 IEEE1588-2008 standard code, first, record the markers T6 that this message comprises, this message is modified, this message is modified, do not change the UUID, MAC Address, sequence of message of this message, all message identification information, while just the hardware markers containing in this message being replaced to described hardware, be designated as the markers of stamping in step S22; Replace to this message the process of going out from described IEEE1588 device forwards, the hardware markers while being transferred to the physical layer in Ethernet agreement, and record this markers T7; Then, calculate this message at described IEEE1588 device interior transmitting procedure time T 8, T8=T7-T6; If there is the FOLLOW UP message of this message, this FOLLOW UP message is modified, only revise the markers that it comprises, its markers is added to time T 8, then this FOLLOW UP message repeating is gone out;
If the DELAY RESPONE MESSAGE (Delay_Resp message) of S26 IEEE1588-2008 standard code, first, record the markers T9 that this message comprises, this message is modified, this message is modified, do not change the UUID, MAC Address, sequence of message of this message, all message identification information, while just the hardware markers containing in this message being replaced to described hardware, be designated as the markers of stamping in step S22; Replace to this message the process of going out from described IEEE1588 device forwards, the hardware markers while being transferred to the physical layer in Ethernet agreement, and record this markers T10; Then, calculate this message at described IEEE1588 device interior transmitting procedure time T 11, T11=T10-T9; If there is the FOLLOW UP message of this message, this FOLLOW UP message is modified, only revise the markers that it comprises, its markers is added to time T 11, then this FOLLOW UP message repeating is gone out.
In sum, the virtual switch method of the IEEE1588 equipment that the present invention proposes, in the IEEE1588 mode of operation realizing, except Master, the Slave of standard, Boundary, also have PTP Switch pattern, can realize the virtual switch function of IEEE1588 equipment.
PTP message virtual switch in the present invention, carries out time bias based on hardware clock, nanosecond precision; Compatible PTPv1 and PTPv2 really meet IEEE1588 standard.
The present invention is only transmitted, is exchanged PTP message, filters out other Ethernet protocol messages, thereby makes system simple, reduces system load, increases time bias precision.
The present invention is by 2 two-way automatic forwardings of network interface; That is,, when 1588 testers are set to virtual switch, the PTP message that any one network interface receives, after all can compensating in the elapsed time, goes out from another port repeat; Which port need not be additionally set and receive, another port repeat.
Here description of the invention and application is illustrative, not wants by scope restriction of the present invention in the above-described embodiments.Here the distortion of disclosed embodiment and change is possible, and for those those of ordinary skill in the art, the various parts of the replacement of embodiment and equivalence are known.Those skilled in the art are noted that in the situation that not departing from spirit of the present invention or substantive characteristics, and the present invention can be with other form, structure, layout, ratio, and realizes with other assembly, material and parts.In the situation that not departing from the scope of the invention and spirit, can carry out other distortion and change to disclosed embodiment here.
Claims (2)
1. a virtual switch method for IEEE1588 equipment, is characterized in that, IEEE1588 equipment has the first Ethernet interface, the second Ethernet interface; Described virtual switch method comprises the steps:
A, the first Ethernet interface receive network data;
B, judge whether the data that described the first Ethernet interface receives are PTP messages; If go to step C, otherwise abandon the data that receive;
C, read the current time in system accurately, correct time is write in the PTP message of having received;
The PTP message of D, correction sends by the second Ethernet interface;
Concrete,
Described method comprises the steps:
S11, two ethernet ports are set is the PTPLISTENING pattern of stipulating in IEEE1588-2002 standard;
S12, the PTP message that each frame is received, the physical layer in Ethernet agreement, stamps the markers Timestamp of hardware clock;
S13, the Ethernet message analysis that each frame is received, if non-PTPv1 protocol massages abandons, if PTPv1 message carries out next step;
If the delay solicited message DELAY REQUEST MESSAGE of S14 IEEE1588-2002 standard code, this message is modified, do not change the UUID, MAC Address, sequence of message, PTP version information of this message, all message identification information, the hardware markers containing in this message is replaced; During described hardware, be designated as the markers of stamping in step S12; Replace to this message the process of going out from described IEEE1588 device forwards, the hardware markers while being transferred to the physical layer in Ethernet agreement;
If the management information MANAGEMENT MESSAGE of S15 IEEE1588-2002 standard code, this message is modified, do not change the UUID, MAC Address, sequence of message of this message, all message identification information, the hardware markers containing in this message is replaced, during described hardware, be designated as the markers of stamping in step S12; Replace to this message the process of going out from described IEEE1588 device forwards, the hardware markers while being transferred to the physical layer in Ethernet agreement.
2. the virtual switch method of IEEE1588 equipment according to claim 1, is characterized in that:
Described method comprises the steps:
S21, two ethernet ports are set is the PTP LISTENING pattern of stipulating in IEEE1588-2008 standard;
S22, the PTP message that each frame is received, the physical layer in Ethernet agreement, stamps the markers Timestamp of hardware clock;
S23, the Ethernet message analysis that each frame is received, if non-PTPv2 protocol massages abandons, if PTPv2 message carries out next step; If the PTP message that itself forwards abandons too;
If the synchronizing information SYNC MESSAGE of S24 IEEE1588-2008 standard code, first, record the markers T1 that this message comprises, this message is modified, do not change the UUID, MAC Address, sequence of message, PTP version information of this message, all message identification information, just the hardware markers containing in this message is replaced; During described hardware, be designated as the markers of stamping in step S22; Replace to this message the process of going out from described IEEE1588 device forwards, the hardware markers while being transferred to the physical layer in Ethernet agreement, and record this markers T2; Then, calculate this message at described IEEE1588 device interior transmitting procedure time T 3, T3=T2-T1; Finally, if PTPv2Delay Mode now, in P2P pattern, according to IEEE1588-2008 standard, measures and forwards port to the line loss time T 4 of SLAVE Clock, calculate total losses time T 5, T5=T3+T4;
If there is the FOLLOW UP message of this message, this FOLLOW UP message is modified, only revise the markers that it comprises, its markers is added to total losses time T 5, then this FOLLOW UP message repeating is gone out;
If the delay solicited message DELAY REQUEST MESSAGE of S25 IEEE1588-2008 standard code, be Delay_Req message, first, record the markers T6 that this message comprises, this message is modified, this message is modified, do not change the UUID, MAC Address, sequence of message of this message, all message identification information, just the hardware markers containing in this message is replaced; During described hardware, be designated as the markers of stamping in step S22; Replace to this message the process of going out from described IEEE1588 device forwards, the hardware markers while being transferred to the physical layer in Ethernet agreement, and record this markers T7; Then, calculate this message at described IEEE1588 device interior transmitting procedure time T 8, T8=T7-T6; If there is the FOLLOW UP message of this message, this FOLLOW UP message is modified, only revise the markers that it comprises, its markers is added to time T 8, then this FOLLOW UP message repeating is gone out;
If the DELAY RESPONE MESSAGE of S26 IEEE1588-2008 standard code, be Delay_Resp message, first, record the markers T9 that this message comprises, this message is modified, this message is modified, do not change the UUID, MAC Address, sequence of message of this message, all message identification information, just the hardware markers containing in this message is replaced; During described hardware, be designated as the markers of stamping in step S22; Replace to this message the process of going out from described IEEE1588 device forwards, the hardware markers while being transferred to the physical layer in Ethernet agreement, and record this markers T10; Then, calculate this message at described IEEE1588 device interior transmitting procedure time T 11, T11=T10-T9; If there is the FOLLOW UP message of this message, this FOLLOWUP message is modified, only revise the markers that it comprises, its markers is added to time T 11, then this FOLLOW UP message repeating is gone out.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080181112A1 (en) * | 2007-01-31 | 2008-07-31 | Juergen Beck | Methods and Apparatus for Controlling Latency Variation in a Packet Transfer Network |
| CN101404618A (en) * | 2008-11-04 | 2009-04-08 | 中兴通讯股份有限公司 | System, apparatus and method for implementing transparent transmission clock in accurate clock synchronization protocol |
| CN101594673A (en) * | 2009-06-29 | 2009-12-02 | 中兴通讯股份有限公司 | A kind of method and system of processing 1588 time stamp in distribution mode |
| CN101645869A (en) * | 2008-08-07 | 2010-02-10 | 上海思弘瑞电力控制技术有限公司 | Switch with submicrosecond clock and switching processing method thereof |
-
2010
- 2010-07-20 CN CN201010231696.0A patent/CN102340439B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080181112A1 (en) * | 2007-01-31 | 2008-07-31 | Juergen Beck | Methods and Apparatus for Controlling Latency Variation in a Packet Transfer Network |
| CN101645869A (en) * | 2008-08-07 | 2010-02-10 | 上海思弘瑞电力控制技术有限公司 | Switch with submicrosecond clock and switching processing method thereof |
| CN101404618A (en) * | 2008-11-04 | 2009-04-08 | 中兴通讯股份有限公司 | System, apparatus and method for implementing transparent transmission clock in accurate clock synchronization protocol |
| CN101594673A (en) * | 2009-06-29 | 2009-12-02 | 中兴通讯股份有限公司 | A kind of method and system of processing 1588 time stamp in distribution mode |
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