CN102868516A - Method and device for synchronizing information distribution of clock in Ethernet - Google Patents
Method and device for synchronizing information distribution of clock in Ethernet Download PDFInfo
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- CN102868516A CN102868516A CN2012103796983A CN201210379698A CN102868516A CN 102868516 A CN102868516 A CN 102868516A CN 2012103796983 A CN2012103796983 A CN 2012103796983A CN 201210379698 A CN201210379698 A CN 201210379698A CN 102868516 A CN102868516 A CN 102868516A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0641—Change of the master or reference, e.g. take-over or failure of the master
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0658—Clock or time synchronisation among packet nodes
- H04J3/0661—Clock or time synchronisation among packet nodes using timestamps
- H04J3/0667—Bidirectional timestamps, e.g. NTP or PTP for compensation of clock drift and for compensation of propagation delays
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Abstract
The invention discloses a method and a device for synchronizing information distribution of a clock in the Ethernet. According to the method, by means of a neighborhood management module of each network element and according to a network element identification, a neighborhood table of each network element is established, a clock source information management module sends a clock identification and clock quality information which are produced by a clock source to the neighborhood network elements in the neighborhood table, clock source information data banks of the network elements are established, and a clock source effective path calculating module calculates synchronous paths of the network elements according to information in the clock source information data banks so that the synchronous paths of the clock source to the network elements are obtained; and when the network topology changes or the clock source can not be used, a path switching module and a clock switching module perform recalculation to obtain new synchronous paths of the network elements. According to the method and the device for synchronizing information distribution of the clock in the Ethernet, clock ring formation can be effectively prevented, and synchronization accuracy of a synchronizing network is guaranteed.
Description
Technical field
The present invention relates to the network communications technology field, relate in particular to the method and apparatus of clock information distribution in a kind of synchronous ethernet.
Background technology
Along with PTN (Packet Transport Network, Packet Transport Network) development of technology, the advantage of Packet Transport Network obtains the sure while of telco service provider, and Packet Transport Network has also been proposed Secretary, and the grouping clock synchronous is exactly one of technology of paying close attention in recent years.Grouping clock synchronous demand is the professional objective demands for networking such as 3G/LTE, and clock synchronous comprises time synchronized, Frequency Synchronization two classes, and synchronization accuracy demand commonly used is as shown in the table:
In order to satisfy high-precision Frequency Synchronization demand, present most popular technology is synchronous ethernet.Ethernet information synchronization passage ESMC (Ethernet Synchronization Messaging Channel) the message carrying Synchronization Status Message SSM (Synchronization Status Message) that synchronous ethernet adopts ITU-T G.8264 to define.Finish the transmission of clock quality information by sending and receiving ESMC message, finish the election of clock source, impel whole net to adopt optimum clock source.
It is as follows that ESMC transmits the clock information coding:
| The SSM coding | Clock quality | Credit rating is described | Corresponding clock grade |
| 0010 | The highest | QL_PRC | G.811 |
| 0100 | ↓ | QL_SSUA | G.812 |
| 1000 | ↓ | QL_SSUB | G.812 |
| 1011 | ↓ | QL_EEC | G.8262 |
| 1111 | Minimum | QL_DNU | Synchronisation source is unavailable |
Wherein, QL_DNU is used for the opposite direction transmission of synchronous path, because QL_DNU can not be elected to be synchronisation source by network element, when network element oppositely sends SSM to synchronisation source, just can use this credit rating to inform the opposite end network element, when the opposite end network element is selected synchronisation source, just can not consider this network element, thereby avoid the generation of clock Cheng Huan like this.
Shown in Fig. 1 a, 1b, in the Ethernet of chain structure, each network element all is synchronized with master clock.When master clock is unavailable; protection occurs and switches in the clock source of each network element; after network element learns that master clock is unavailable; enable standby clock (namely from clock); send standby clock source quality information QL_DNU; thereby guarantee can oppositely not interlock the clock source that had lost efficacy, prevent the appearance of clock ring.Being depicted as each network element such as Fig. 1 b adopts from the timing path of clock and is synchronized with from clock.
But when network itself is that this anti-ring function then can lose efficacy when having the comparatively complicated network of loop.Shown in Fig. 2 a, 2b, in master clock when normal operation,, each network element is synchronized with master clock, and network element 4 is through network element 1, and the path of network element 3 is synchronized with master clock.When master clock is unavailable, network element 4 can receive the QL_PRC of network element 2, network element 3 receives the QL_PRC that network element 4 sends, network element 1 receives the QL_PRC that network element 3 sends, network element 2 receives the QL_PRC that network 1 sends, thereby the formation clock loop, namely the transmit path of clock is the loop of network element 2-＞network element 4-＞network element 3-＞network element 1-＞network element 2, thereby causes can't normally realizing synchronously between each network element in the whole network.
For this problem, in Chinese patent application number is 201110185697.0 Patent Application Publication text, a solution has been proposed, it increases the sign of clock source by expansion ESMC message, overcomes the technical problem of clock Cheng Huan in the synchronous ethernet.Shown in Fig. 3 a, to cross network when the clock information exchange and postback when starting network element, the network element that starts is ignored this clock information, its clock source that oneself sends of network element error lock of the clock source information of avoiding starting.
But this method can only be applicable to simple looped network environment, for the full internet of complexity, because its clock source information can form clock loop without originating network, so above-mentioned mechanism can't be used.Shown in Fig. 3 b, network element 4 can receive the QL_PRC of network element 2, network element 3 receives the QL_PRC that network element 4 sends, network element 2 receives the QL_PRC that network element 3 sends, thereby formation clock loop, the transmit path of clock is network element 2-＞4-＞network element 3-＞network element 2, thereby the clock synchronous between each network element is normally realized.
Summary of the invention
The object of the invention is to overcome the defective of prior art, for forming clock loop in the transmittance process of synchronous ethernet synchronizing information, a kind of method and apparatus that can high efficiencyly finish clock synchronization information distribution in the synchronous ethernet is provided, with the problem of clock loop in the thorough solution synchronous ethernet, and the synchronization accuracy of raising synchronous ethernet.
For achieving the above object, the present invention proposes following technical scheme: the method for clock information distribution in a kind of synchronous ethernet comprises:
Set up the neighborhood table of each network element, comprise the network element ID of each neighbours' network element in this neighborhood table;
The clock sign that clock source is produced and clock quality information send to each the neighbours' network element in the described neighborhood table, and set up the clock source information database of each network element; And
According to the information in the clock source information database, calculate the synchronous path of each network element.
Further, when network topology changes, need to recomputate synchronous path by upgrading neighborhood table and clock source information database.
The foundation of described each network element neighborhood table comprises:
After network element was enabled ESMC, network element calculated its network element ID in network by MAC Address, and periodically sent network element ID to corresponding neighbours;
Network element interface is monitored neighbours and is found message, and the network element ID that will enable the message that the port of ESMC function receives is updated in the neighborhood table; And
Be updated periodically the neighbours' net element information in the neighborhood table and notify the clock source information database to upgrade accordingly.
Described clock source information database by clock source periodically tranmitting data register source information realize to upgrade to the neighbours' network element in the neighborhood table.
The calculating of the synchronous path of described each network element comprises the clock source quality in the comparison clock source information database successively, and network element is to the jumping figure between clock source and network element ID and get.
When the network element of next-door neighbour's master clock source detects master clock when unavailable, send the disabled notification packet of master clock source, each network element refresh clock source information database, and reselect the clock source of a suboptimum, and recomputate the synchronous path of each network element.
Information in the described clock source information database comprises the clock source identification information of each neighbours' network element, clock source quality information, the network element ID of neighbours' network element, and the jumping figure information that arrives clock source by corresponding neighbours' network element.
The present invention also proposes the device of clock information distribution in a kind of synchronous ethernet, comprising:
Neighborhood table administration module periodically upgrades for the neighborhood table of neighbours' net element information of setting up each network element and to it;
The clock source information administration module, the clock sign and the clock quality information that are used for clock source is produced send to all neighbours' network elements, and the clock source information database of each network element of doing the best;
Clock source active path computing module is used for the information according to the clock source information database, the clock synchronous path of calculating each network element.
Further, described neighborhood table administration module comprises again:
The network element ID sending module periodically sends to corresponding neighbours' network element for network element ID corresponding to network element that will enable ESMC;
The network element ID receiver module is used for receiving the neighbours that enabled the ESMC port and finds message, and obtains the network element ID in the message; And
Neighborhood table maintenance module is used for being updated periodically neighbours' net element information and notifying the clock source information administration module to upgrade accordingly operation.
Described device also comprises:
The path handover module is used for recomputating the synchronous path of each network element when network topology changes; And
The clock handover module is used for when master clock is unavailable, selects the clock source of a suboptimum by the clock source information database after upgrading, and recomputates the synchronous path of each network element.
Compared with prior art, the method and apparatus of clock information distribution in the disclosed synchronous ethernet, effectively having avoided being included in network topology changes, and in the clock source situation about changing, clock in the whole network can not become ring, thereby has guaranteed the synchronization accuracy of synchronizing network.
Description of drawings
Fig. 1 a is the schematic diagram that each network element is synchronized with the clock path of master clock in the existing chain synchronizing network;
Fig. 1 b is the schematic diagram of the clock path after master clock lost efficacy among Fig. 1 a;
Fig. 2 a is the schematic diagram that each network element is synchronized with the clock path of master clock in the existing annular synchronizing network;
Fig. 2 b is the schematic diagram of the clock path after master clock lost efficacy among Fig. 2 a;
Fig. 3 a is the clock path schematic diagram when increasing expansion ESMC message after existing master clock lost efficacy;
Fig. 3 b is the schematic diagram that Fig. 3 a is applied to the clock path in another network;
Fig. 4 is the module map of the device of clock information distribution in the synchronous ethernet of the present invention;
Fig. 5 is the schematic diagram of setting up the neighborhood table in the synchronous ethernet of the present invention;
Fig. 6 is the flow chart that the present invention sends network element ID;
Fig. 7 receives in the neighborhood table of the present invention that neighbours find the process chart of message;
Fig. 8 is the schematic diagram of setting up the clock source information administration module in the synchronous ethernet of the present invention;
Fig. 9 is the process chart of clock source generation module monitors clock source information of the present invention;
Figure 10 is the process chart when receiving clock source information in the clock source information administration module of the present invention;
Figure 11 is the clock path schematic diagram of each network element in the synchronous ethernet of the present invention;
Figure 12 is the clock path schematic diagram after the fault between network element in the synchronous ethernet of the present invention;
Figure 13 is the clock path schematic diagram of master clock after unavailable in the synchronous ethernet of the present invention.
Embodiment
Below in conjunction with accompanying drawing of the present invention, the technical scheme of the embodiment of the invention is carried out clear, complete description.
As shown in Figure 4, the device of clock information distribution in the disclosed synchronous ethernet, it comprises neighborhood table administration module, clock source information administration module, clock source active path computing module, path handover module, and clock handover module.The present invention is by setting up the neighborhood table between the network element of Ethernet, produce unique clock sign and clock quality information by the clock source information administration module by clock source, then be distributed to all neighbours' network elements, by clock source active path computing module relatively after the priority and jumping figure of each clock, select the clock source of clock path optimum, simultaneously, when clock source or topology network change, again select clock source and the synchronous path of suboptimum by clock handover module and path handover module, thereby effectively guaranteed the synchronous clock source in the network, and overcome the problem that forms clock loop.
Specifically, neighborhood table administration module is used for setting up the neighborhood table of the network element ID that comprises neighbours' network element, and it comprises the network element ID sending module, network element ID receiver module, and neighborhood table maintenance module.As shown in Figure 5, after all network elements start, produce the unique identification of network element, such as network element 1, network element 2, network element 3 and network element 4.
Find message by network element ID sending module and network element ID receiver module sending and receiving neighbours between each network element, and set up the neighborhood table.Comprise network element ID and the corresponding port of each neighbours' network element in the neighborhood table, comprise network element 1 in the neighborhood table such as network element among Fig. 52, network element 3 and network element 4, its corresponding port is respectively the port P1 of network element 1, the port P2 of network element 2, the port P3 of network element 3.
Wherein, the network element ID sending module sends network element ID, and the network element ID receiver module receives neighbours' network element ID, neighbor table maintenance module maintenance of neighbor table, and detailed process is as follows:
As shown in Figure 6, the process of transmitting of network element ID is: after network element is enabled ESMC, network element is by the unique identification of MAC Address calculating at network, then network element periodically sends network element ID to corresponding neighbours, such as network element 2 with its network element ID and port P1, P2, P3 send to respectively network element 1, network element 3 and network element 4.
As shown in Figure 7, the receiving course of network element ID is: network element interface is monitored neighbours and is found message, when receiving that correct neighbours find message, determine at first whether port enables the ESMC function, if enable then obtain network element ID in the message, the neighborhood table is refreshed or add action, otherwise abandon this message.
The maintenance process of neighbor table is: each clauses and subclauses has timer in the neighbor table, if timer expiry is then deleted this neighbours' network element and notified the clock source information administration module to upgrade accordingly operation.If interface corresponding to neighbours breaks down, also can delete immediately these neighbours and notify the clock source information administration module to upgrade accordingly operation.
The clock source information administration module produces unique clock sign and clock quality information by clock source, then clock information is distributed to all neighbours' network elements, sets up the clock source information database, and horizontal partition principle is adopted in the information issue of clock source.As shown in Figure 8, clock source comprises master clock A and from clock B, the clock quality of master clock A is OL_PRC, be QL_SSU from the clock quality of clock B, the quality of the master clock A credit rating from clock B is high, and this clock information sends to network element 1, network element 2, network element 3 and network element 4 make each network element set up respectively the clock source information database, such as the clock source information database of network element among Fig. 82 are:
| Entry number | Clock source | Quality | Neighbours | Jumping figure | Optimum | |
| 1 | A | | Network element | 1 | 2 | Be |
| 2 | A | | Network element | 3 | 3 | No |
| 3 | A | | Network element | 4 | 4 | No |
| 4 | B | | Network element | 1 | 4 | No |
| 5 | B | | Network element | 3 | 3 | No |
| 6 | B | | Network element | 4 | 2 | No |
The clock source information database of network element 4 is:
| Entry number | Clock source | Quality | Neighbours | Jumping figure | Optimum | |
| 1 | A | | Network element | 2 | 3 | Be |
| 2 | A | | Network element | 3 | 3 | No |
| 3 | B | QL_SSU | From |
1 | No |
The clock source information administration module comprises again clock source generation module, clock source receiver module and clock source forwarding module.
Wherein, clock source generation module operates on the equipment of clock source, is used for calculating unique clock source sign, regularly sends to adjacent network element, when the clock source quality changes, triggers immediately the renewal message and sends to adjacent network element.
As shown in Figure 9, clock source receives mould and is responsible for receive clock source information, if receive available clock source information, then joins in the clock source database; If receive the clock source lastest imformation, clock source information corresponding to new database more then; If receive clock source deletion information, then the clock source information of correspondence in the delete database.
As shown in figure 10, the clock source forwarding module mainly is responsible for announcing mutually between network element clock source information.If network element during from certain neighbor learning to new clock source, then adds 1 to jumping figure, then clock source information is sent to other neighbours; If network element listens to clock source information and changes, then send immediately and upgrade message to neighbours; If it is unavailable that network element listens to clock information, then send immediately the renewal message and delete corresponding clock source by neighbours.
Clock source active path computing module mainly is responsible for the calculating in clock synchronous path, the scan clock source database, and relatively reach calculating below carrying out:
The comparison clock source quality takes out the highest clauses and subclauses of clock source quality, in the clock source information database such as the network element 2 among Fig. 8, comprise clock source A and clock source B, wherein, the clock quality of clock source A is high, therefore, will comprise the clauses and subclauses 1 of clock source A, clauses and subclauses 2 and clauses and subclauses 3 are taken out.
If the clock source quality can unique definite sync cap, selected interface synchronization then; If there are clock source clauses and subclauses identical in quality, then relatively arrive the jumping figure of clock source, jumping figure is minimum, is more excellent synchronous path; If relatively can unique certain sync cap, then selected interface synchronization by jumping figure.Jumping figure such as clauses and subclauses 1 in the clock source information database of network element among Fig. 82 minimum (being 2 jumpings), therefore, the clock path of network element 2 is elected master clock A as, and network element 1 is to the path of network element 2.
If have the identical clauses and subclauses of jumping figure, then comparison clock source neighbours' network element ID; Network element ID is less, is more excellent synchronous path, and selected interface corresponding to these neighbours is sync cap, clauses and subclauses such as the clock source A that clock source priority is higher in the clock source information database of network element among the figure 4 have two, and this jumping figure of two is also identical, are 3 jumpings, therefore, neighbours' network element ID that also will compare these two clauses and subclauses, and therefore the sign of network element 2 is less than network element 3,, as shown in figure 11, the clock path of network element 4 is elected master clock A as, network element 1, and network element 2 is to the path of network element 4.
Certainly, in other embodiments of the invention, when comparison clock source neighbours' network element ID, also can with network element ID larger be defined as more excellent path.
And when topology network changed, respective change also will occur in the synchronous path of clock.At this moment, by path handover module again selected new clock path, and the process that clock path is selected again comprises by neighborhood table detection failure, and send unreachable information to corresponding neighbours' network element, by the information of clock source information administration module refresh clock source database, and recomputate synchronous path.As shown in figure 12, when breaking down between the port P2 of the port P2 of network element 2 and network element 4, in the clock source information database of network element 2, be master clock A about clock source, neighbours are that the clauses and subclauses of network element 4 are then deleted, in like manner, clock source in the clock source information database of network element 3 is master clock A, neighbours are that the network element clauses and subclauses of network element 4 are deleted, and the clock source in the clock source information database of network element 4 is master clock A, and neighbours are that the clauses and subclauses of network element 2 are deleted.
And when master clock owing to losing efficacy or failure and other reasons when unavailable, whole net must select the clock source of a suboptimum as the synchronous clock source of whole net by the clock handover module, it comprises:
It is unavailable that the network element of next-door neighbour's clock source detects clock source;
The disabled infomational message in tranmitting data register source is announced whole net;
Refresh clock source information database;
Recomputate synchronous path.
As shown in figure 13, when master clock A was unavailable, the disabled message in network element 1 tranmitting data register source was to network element 2, network element 3 and network element 4, each network element refresh clock source information database, the clauses and subclauses relevant with clock source A are all deleted, and what select suboptimum is clock source the synchronizing network from clock B, simultaneously, each network element recalculates the synchronous path of each network element by clock source active path computing module, as the synchronous path that recomputates rear network element 1 is for from clock B, network element 4, and network element 2 is to the path of network element 1.
Technology contents of the present invention and technical characterictic have disclosed as above; yet those of ordinary skill in the art still may be based on teaching of the present invention and announcements and are done all replacement and modifications that does not deviate from spirit of the present invention; therefore; protection range of the present invention should be not limited to the content that embodiment discloses; and should comprise various do not deviate from replacement of the present invention and modifications, and contained by the present patent application claim.
Claims (10)
1. the method for clock information distribution in the synchronous ethernet is characterized in that comprising:
Set up the neighborhood table of each network element, comprise the network element ID of each neighbours' network element in this neighborhood table;
The clock sign that clock source is produced and clock quality information send to each the neighbours' network element in the described neighborhood table, and set up the clock source information database of each network element; And
According to the information in the clock source information database, calculate the synchronous path of each network element.
2. method according to claim 1 is characterized in that: when network topology changes, need to recomputate synchronous path by upgrading neighborhood table and clock source information database.
3. method according to claim 1, it is characterized in that: the foundation of described each network element neighborhood table comprises:
After network element was enabled ESMC, network element calculated its network element ID in network by MAC Address, and periodically sent network element ID to corresponding neighbours;
Network element interface is monitored neighbours and is found message, and the network element ID that will enable the message that the port of ESMC function receives is updated in the neighborhood table; And
Be updated periodically the neighbours' net element information in the neighborhood table and notify the clock source information database to upgrade accordingly.
4. method according to claim 1 is characterized in that: described clock source information database by clock source periodically tranmitting data register source information realize upgrading to the neighbours' network element in the neighborhood table.
5. method according to claim 1 is characterized in that: the calculating of the synchronous path of described each network element comprises the clock source quality in the comparison clock source information database successively, and network element is to the jumping figure between clock source and network element ID and get.
6. method according to claim 1, it is characterized in that: when the network element of next-door neighbour's master clock source detects master clock when unavailable, send the disabled notification packet of master clock source, each network element refresh clock source information database, and reselect the clock source of a suboptimum, and recomputate the synchronous path of each network element.
7. according to claim 1 to the described method of 6 any one, it is characterized in that: the information in the described clock source information database comprises the clock source identification information of each neighbours' network element, the clock source quality information, the network element ID of neighbours' network element, and the jumping figure information that arrives clock source by corresponding neighbours' network element.
8. the device of clock information distribution in the synchronous ethernet is characterized in that comprising:
Neighborhood table administration module periodically upgrades for the neighborhood table of neighbours' net element information of setting up each network element and to it;
The clock source information administration module, the clock sign and the clock quality information that are used for clock source is produced send to all neighbours' network elements, and the clock source information database of each network element of doing the best;
Clock source active path computing module is used for the information according to the clock source information database, the clock synchronous path of calculating each network element.
9. device according to claim 8, it is characterized in that: described neighborhood table administration module comprises again:
The network element ID sending module periodically sends to corresponding neighbours' network element for network element ID corresponding to network element that will enable ESMC;
The network element ID receiver module is used for receiving the neighbours that enabled the ESMC port and finds message, and obtains the network element ID in the message; And
Neighborhood table maintenance module is used for being updated periodically neighbours' net element information and notifying the clock source information administration module to upgrade accordingly operation.
10. device according to claim 8 characterized by further comprising:
The path handover module is used for recomputating the synchronous path of each network element when network topology changes; And
The clock handover module is used for when master clock is unavailable, selects the clock source of a suboptimum by the clock source information database after upgrading, and recomputates the synchronous path of each network element.
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