CN102158412A - Transmission method and system of synchronous state information in Ethernet synchronization - Google Patents
Transmission method and system of synchronous state information in Ethernet synchronization Download PDFInfo
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Abstract
The invention discloses a transmission method and system of synchronous state information in Ethernet synchronization. The method comprises the following steps that: a first node receives first synchronization state information from a second node on each link between the first node and the second node, wherein the quality level of the first synchronization state information is equal to the quality level of the second node; if the first node is only connected with the second node, a first port on the first node is set to only receive the first synchronization state information from a second port on the second node, and the second synchronization state information is sent to the second node from all other ports connected with the second node, except the first port, wherein the quality level of the second synchronization state information is different from that of the first synchronization state information, and a link is provided between the first port and the second port; by use of the invention, rings formed by connecting a plurality of links can be avoided so that the synchronization state information is smoothly transmitted towards the downstream.
Description
Technical field
The present invention relates to the communications field, in particular to the transmission method and the system of the Synchronization Status Message of a kind of Ethernet in synchronously.
Background technology
At telco service provider's network in the evolution of next generation network, Ethernet will progressively replace PDH (PlesynchronousDigital Hierarchy, PDH (Pseudo-synchronous Digital Hierarchy)) and SONET (Synchronous Optical Network, Synchronous Optical Network)/SDH (Synchronous Digital Hierarchy, SDH (Synchronous Digital Hierarchy)) transmission network.Therefore, application in the ask for something strict synchronism (comprises wireless base station and TDM (Time Division Multiplex and Multiplexer, time division multiplexing and multiplexer circuit emulation (CES:Circuit Emulation Service) equipment) in, telco service provider will face the challenge of how transmitting high-quality clock synchronization by Ethernet.Up-to-date standard solution is synchronous ethernet (SyncE).
In SyncE, Ethernet adopts the mode identical with SONET/SDH, by high-quality, can follow the tracks of synchronous its bit clock of one-level reference clock signal.2006, International Telecommunications Union described the SyncE notion at it in G.8261.2007, in G 8262, the SyncE performance requirement has been carried out standardization.Stipulated the minimum performance requirement of the clock that uses in the synchronous ethernet network equipment.
The synchronous ethernet technology is widely used in DSLAM (Digital Subscriber Line Access Multiplexer, digital subscriber line access multiplex), router, MSSP (MultiService Switch Platform multiservice switching platform), PON (PassiveOptical Network passive optical-fiber network) and Multi-Service Access Device.High bandwidth is passed through in support.Merge the synchronous ethernet link and come voice-over, data, video and traditional business.
And the key technology that realizes synchronous ethernet is exactly a Synchronization Status Message, Synchronization Status Message (SSM:SynchronizationStatus Message) exchanges to provide to downstream ether to be determined can follow the tracks of the mechanism of synchronous allocative decision and return PRC (PrimaryReference Clock, main reference clock) or utilize higher-quality clock.Synchronizing function is with treatment S SM.Under the upstream network malfunction, synchronizing function is taked suitable operation according to SSM with the priority that presets.Select another synchronous supply.This may be that another network is supplied with or outside the supply.SSM is by G 707 definition.
But because the message format of Synchronization Status Message and the restriction of the method for synchronization, in many particular environment, Synchronization Status Message can go out the situation of ready-made ring at present, looped network for example, and multilink is communicated with or the like.
Networking with Fig. 1 is an example, and Fig. 2 is the flow process of standard SSM agreement under the network environment of Fig. 1.
Basic multilink UNICOM networking comprises DUT1 102 and DUT2 104, and wherein two links and/or two above links of link link to each other between DUT1 102 and the DUT2 104.Describe with the example that is transmitted as of carrying out Synchronization Status Message by two links between DUT1 102 and the DUT2 104 below, more than the step carried out of two network elements as follows:
S201:DUT1 (Device Under Test, measured device) 102 sole mass grades are 2,2 two links of configured port 11 and port one, and port one 1 and port one 2 respectively corresponding clock sources are played automatic SSM algorithm and are carried out the transmission of Synchronization Status Message;
S202:DUT2 104 sole mass grades are 4,22 two links of configured port 21 and port, and port 21 and port 22 respectively corresponding clock sources are played automatic SSM algorithm and are carried out the transmission of Synchronization Status Message; Wherein, port one 1 forms a link with port 21, and port one 2 and port 22 form a link;
S203:DUT1 102 port ones 1 and port one 2 are received the SSM message that DUT2 104 sends, and carrying credit rating is 4, and DUT1 102 is according to the priority of configuration, and selecting port 11 is the clock source;
S204: after at this moment the port one 1 of DUT1 102 was selected as the source, port one 2 will transmit credit rating 4 by the SSM message downstream.;
The port 22 of S205:DUT2 104 has been received the SSM message that DUT1 102 sends, and port 22 will be selected to clock source and locking;
It is that the clock source of 4 port is as the locking source that S206:DUT1 102 and DUT2 104 have selected quality of reception grade simultaneously, at this moment, on two links between DUT1 and the DUT2, there are two locking sources, promptly be actually the locking source of the credit rating of DUT2 104 self, like this between DUT1 and the DUT2 port 21 to send credit rating to port one 1 be 4 Synchronization Status Message, port one 2 is 4 Synchronization Status Message to port 22 transmission credit ratings, thereby between two equipment, formed " loop ", caused the equal losing lock in last two ends.
As can be seen from the above step, two network element clocks in Fig. 1 networking can't be synchronous, can bring regular traffic to have a strong impact on.
Summary of the invention
Main purpose of the present invention is to provide the transmission method and the system of the Synchronization Status Message of a kind of Ethernet in synchronously, becomes ring to solve in the prior art Synchronization Status Message when the multilink UNICOM, causes the problem of network element losing lock.
According to an aspect of the present invention, the transmission method of the Synchronization Status Message of a kind of Ethernet in synchronously is provided, comprise: first node receives first Synchronization Status Message from described Section Point on every link between described first node and the Section Point, wherein, the credit rating of described first Synchronization Status Message is the credit rating of described Section Point; If described first node only connects described Section Point, first port of then described first node on it is set to receive only described first Synchronization Status Message from second port on the described Section Point, and with all of the port that described Section Point is connected in send second Synchronization Status Message to described Section Point on other ports except that described first port, wherein, the credit rating of described second Synchronization Status Message is different with described first Synchronization Status Message, has a described link between described first port and described second port.
Further, after described Section Point received described second Synchronization Status Message, the transmission method of the Synchronization Status Message during Ethernet is synchronous also comprises: described Section Point only sent described first Synchronization Status Message to described first port on described second port.
Further, the transmission method of the Synchronization Status Message during Ethernet is synchronous also comprises: if described first node connects described Section Point and the 3rd node, and the credit rating of the 3rd Synchronization Status Message that the credit rating of described first Synchronization Status Message that the more described Section Point of described first node sends and described the 3rd node send; If the credit rating of described first Synchronization Status Message that described Section Point sends is higher than the credit rating of the 3rd Synchronization Status Message of described the 3rd node transmission, described first port of then described first node on it is set to receive only described first Synchronization Status Message from described second port on the described Section Point, and with all of the port that described Section Point is connected in send described second Synchronization Status Message to described Section Point on other ports except that described first port, wherein, the credit rating of described second Synchronization Status Message is different with described first Synchronization Status Message; And described first node the 3rd port that is used to connect described the 3rd node on it is set to only send to the 4th port of described the 3rd node first Synchronization Status Message of second port on described Section Point, and with all of the port that described the 3rd node is connected in send described second Synchronization Status Message to described the 3rd node on other ports except that described the 3rd port.
Further, if the credit rating of described first Synchronization Status Message that described Section Point sends is less than or equal to the credit rating of the 3rd Synchronization Status Message of described the 3rd node transmission, described method also comprises: described three port of described first node on it is set to receive only described the 3rd Synchronization Status Message from described the 4th port on described the 3rd node, and with all of the port that described the 3rd node is connected in send described second Synchronization Status Message to described the 3rd node on other ports except that described the 3rd port, wherein, the credit rating of described second Synchronization Status Message is different with described the 3rd Synchronization Status Message; And described first node described first port that is used to connect described Section Point on it is set to only send to described second port of described Section Point described the 3rd Synchronization Status Message of described the 4th port on described the 3rd node, and with all of the port that described Section Point is connected in send described second Synchronization Status Message to described Section Point on other ports except that described first port.
Further, the credit rating of more described first Synchronization Status Message and the credit rating of described the 3rd Synchronization Status Message are come in the Warning Mark position of the 3rd Synchronization Status Message of the Warning Mark position of described first Synchronization Status Message that sends according to described Section Point of the described first node indication credit rating of carrying and the transmission of described the 3rd node indication credit rating of carrying.
According to a further aspect in the invention, the transmission system of the Synchronization Status Message of a kind of Ethernet in synchronously is provided, comprise: first node and Section Point, wherein: described Section Point is used for sending first Synchronization Status Message to described first node on every first link between described first node and the described Section Point, wherein, the credit rating of described first Synchronization Status Message is the credit rating of described Section Point; Described first node is used for when described first node only connects described Section Point, first port on it is set to receive only described first Synchronization Status Message from second port on the described Section Point, and with all of the port that described Section Point is connected in send second Synchronization Status Message to described Section Point on other ports except that described first port, wherein, the credit rating of described second Synchronization Status Message is different with described first Synchronization Status Message, has described first link between described first port and described second port.
Further, described Section Point also is used for after receiving described second Synchronization Status Message, only sends described first Synchronization Status Message to described first port on described second port.
Further, the transmission system of the Synchronization Status Message during Ethernet is synchronous also comprises: the 3rd node that connects described first node, be used on every second link between described first node and described the 3rd node, sending the 3rd Synchronization Status Message, wherein, the credit rating of described the 3rd Synchronization Status Message is the credit rating of described the 3rd node; Wherein, described first node comprises: the comparing unit of Lian Jieing and first transmitting element successively, wherein, comparing unit is used for the credit rating of described first Synchronization Status Message that more described Section Point sends and the credit rating of described the 3rd Synchronization Status Message of described the 3rd node transmission; First transmitting element is used for when the credit rating of described first Synchronization Status Message is higher than the credit rating of described the 3rd Synchronization Status Message, described first port of described first node is set to receive only described first Synchronization Status Message from described second port of described Section Point, and with all of the port that described Section Point is connected in send described second Synchronization Status Message to described Section Point on other ports except that described first port, wherein, the credit rating of described second Synchronization Status Message is different with described first Synchronization Status Message; And being used in the described first node the 3rd port that connects described the 3rd node be set to only send described first Synchronization Status Message of second port on described Section Point to the 4th port of described the 3rd node, and with all of the port that described the 3rd node is connected in send described second Synchronization Status Message to described the 3rd node on other ports except that described the 3rd port.
Further, described first node also comprises: second transmitting element that connects comparing unit, be used for when the credit rating of described first Synchronization Status Message is less than or equal to the credit rating of described the 3rd Synchronization Status Message, described the 3rd port of described first node is set to receive only described the 3rd Synchronization Status Message from described the 4th port on described the 3rd node, and with all of the port that described the 3rd node is connected in send described second Synchronization Status Message to described the 3rd node on other ports except that described the 3rd port, wherein, the credit rating of described second Synchronization Status Message is different with described the 3rd Synchronization Status Message; And being used in the described first node described first port that connects described Section Point be set to only send described the 3rd Synchronization Status Message of described the 4th port on described the 3rd node to described second port of described Section Point, and with all of the port that described Section Point is connected in send described second Synchronization Status Message to described Section Point on other ports except that described first port.
Further, the credit rating of more described first Synchronization Status Message and the credit rating of described the 3rd Synchronization Status Message are come in the Warning Mark position of the 3rd Synchronization Status Message of the described comparing unit Warning Mark position that also is used for the indication credit rating of carrying according to described first Synchronization Status Message that described Section Point sends and the transmission of described the 3rd node indication credit rating of carrying.
By the present invention, the multilink of switching equipment is divided into groups in employing, and select a link to carry out the transmission of Synchronization Status Message from every group, the problem that has solved, and then reached and prevent the Cheng Huan of multilink UNICOM, thereby the effect that Synchronization Status Message is transmitted smoothly downstream.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the basic multilink UNICOM networking diagram according to correlation technique;
Fig. 2 is the flow chart of standard SSM agreement in the networking of basic multilink UNICOM according to correlation technique;
Fig. 3 is the preferred structure block diagram according to the transmission system of the Ethernet of the embodiment of the invention Synchronization Status Message in synchronously;
Fig. 4 is the preferred flow charts according to the transmission method of the Ethernet of the embodiment of the invention Synchronization Status Message in synchronously;
Fig. 5 is the another kind of flow chart according to the transmission method of the Ethernet of the embodiment of the invention Synchronization Status Message in synchronously.
Embodiment
Hereinafter will describe the present invention with reference to the accompanying drawings and in conjunction with the embodiments in detail.Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.
Embodiment 1
Fig. 3 is according to the preferred structure block diagram of the transmission system of the Ethernet of the embodiment of the invention Synchronization Status Message in synchronously, comprising: first node 302 and Section Point 304, wherein:
Section Point 304 is used for sending first Synchronization Status Message to first node 302 on every first link between first node 302 and the Section Point 304, and wherein, the credit rating of first Synchronization Status Message is the credit rating of Section Point;
First node 302 is used for when 302 of first nodes connect Section Point 304, first port on it (for example port one 1) is set to receive only first Synchronization Status Message from second port on the Section Point 304 (for example port 21), and with all of the port that Section Point 304 is connected in other ports (for example port one 2-1n) except that first port go up to Section Point 304 and send second Synchronization Status Message, wherein, the credit rating of second Synchronization Status Message is different with first Synchronization Status Message, has one first link between first port and second port.
In this preferred embodiment, the multilink of switching equipment is divided into groups in employing, and select a link to carry out the transmission of Synchronization Status Message from every group, the problem that has solved, and then reached and prevent the Cheng Huan of multilink UNICOM, thereby the effect that Synchronization Status Message is transmitted smoothly downstream.
Wherein, the credit rating of second Synchronization Status Message is used to indicate 304 of Section Points to send first Synchronization Status Message to first port on second port for can be set to F.
First node 302 in this preferred embodiment can be corresponding to the DUT1 among Fig. 1, and Section Point 304 is corresponding to the DUT2 among Fig. 1, and its first link comprises the link between the port one i-port 2i, wherein, i=1,2 ... n.
Preferably, Section Point 304 only sends first Synchronization Status Message to first port on second port after receiving second Synchronization Status Message.In this preferred embodiment, other ports except second port (for example port 21) (for example port 22-2n) on the Section Point 304 all do not send Synchronization Status Message to first node, guaranteed between Section Point 304 and first node 302, only to adopt a link transmission Synchronization Status Message, avoid forming loop, can be successfully just Synchronization Status Message transmit.Certainly, the present invention is not limited thereto, for example: after Section Point 304 is receiving second Synchronization Status Message, other ports except second port (for example port 21) (for example port 22-2n) on the Section Point 304 all do not send Synchronization Status Message to first node 302, but send other information or data.
Certainly, present embodiment is not limited to two nodes, transmission system according to the Ethernet of the embodiment of the invention Synchronization Status Message in synchronously can also comprise three nodes, as shown in Figure 3, the 3rd node 306 of first node 302, the Section Point 304 that connects first node 302 and connection first node 302, the 3rd node 306 sends the 3rd Synchronization Status Message on every second link between first node 302 and the 3rd node 306, wherein, the credit rating of the 3rd Synchronization Status Message is the credit rating of the 3rd node.In the present embodiment, second link comprises port 4i to the link between the port 3i, wherein, i=1,2 ... n.
In this preferred embodiment, under the situation that comprises three nodes, first node 302 comprises: the comparing unit 3021 of Lian Jieing and first transmitting element 3022 successively, wherein, the comparing unit 3021 and first transmitting element 3022 can carry out the transmission of the Synchronization Status Message of Ethernet in synchronously by following steps:
The credit rating of first Synchronization Status Message that comparing unit 3021 comparison Section Points send and the credit rating of the 3rd Synchronization Status Message that the 3rd node sends; When the credit rating that first transmitting element 3022 compares first Synchronization Status Message at comparing unit 3021 is higher than the credit rating of the 3rd Synchronization Status Message, first port (for example port one 1) of first node 302 is set to receive only first Synchronization Status Message on second port (for example port 21) from Section Point 304, and with all of the port that Section Point 304 is connected in other ports (for example port one 2-1n) except that first port go up to Section Point 304 and send second Synchronization Status Message, wherein, the credit rating of second Synchronization Status Message is different with first Synchronization Status Message; And the 3rd port (for example port 41) that being used in the first node 302 connects the 3rd node 306 is set to only send to the 4th port (for example port 31) of the 3rd node 306 first Synchronization Status Message of second port (for example port 21) on Section Point 304, and with all of the port that the 3rd node 306 is connected in other ports (for example port 42-4n) except that the 3rd port go up to the 3rd node 306 and send second Synchronization Status Message.In this preferred embodiment, three nodes are arranged in transmission path, then three nodes link is between any two selected respectively, select link optimum between per two nodes, and between all optimum links, select the link of one tunnel the best, receive Synchronization Status Message at this best link, on the basis that prevents link Cheng Huan, saved link circuit resource.
Preferably, first node 302 also comprises: second transmitting element 3023 that connects comparing unit 3021.On the above-mentioned basis of transmitting to the Synchronization Status Message of Ethernet in synchronously, when if the credit rating that comparing unit 3021 compares first Synchronization Status Message is less than or equal to the credit rating of the 3rd Synchronization Status Message, then second transmitting element 3023 is set to receive only the 3rd Synchronization Status Message from the 4th port on the 3rd node 306 (for example port 31) with the 3rd port (for example port 41) of first node 302, and with all of the port that the 3rd node 306 is connected in other ports (for example port 42-4n) except that the 3rd port go up to the 3rd node 306 and send second Synchronization Status Message, wherein, the credit rating of second Synchronization Status Message is different with the 3rd Synchronization Status Message; And second transmitting element 3023 first port (for example port one 1) that being used in the first node 302 connected Section Point 304 be set to only send the 3rd Synchronization Status Message of the 4th port (for example port 31) on the 3rd node 306 to second port (for example port 21) of Section Point 304, and with all of the port that Section Point 304 is connected in other ports (for example port one 2-1n) except that first port go up to Section Point 304 and send second Synchronization Status Message.In this preferred embodiment, owing in the transmission path three nodes are arranged, therefore three nodes link is between any two selected respectively, select link optimum between per two nodes, and between all optimum links, select the link of one tunnel the best, on the link of the optimum outside the link of the best, send Synchronization Status Message, thereby on the basis that prevents link Cheng Huan, saved link circuit resource.
Preferably, the credit rating of comparison first Synchronization Status Message and the credit rating of the 3rd Synchronization Status Message are come in the Warning Mark position of the 3rd Synchronization Status Message of the Warning Mark position of first Synchronization Status Message that sends according to Section Point 304 of the comparing unit 3021 indication credit rating of carrying and 306 transmissions of the 3rd node indication credit rating of carrying.In this preferred embodiment, adopt the Warning Mark position of the indication credit rating that Synchronization Status Message is carried to judge the credit rating of Synchronization Status Message, saved relatively flow process, reduced workload.
In the present embodiment, the process of transmitting that above-mentioned first transmitting element and second transmitting element carry out according to the comparative result of comparing unit, it is an example, form that the present invention is not limited thereto, for example: the credit rating that compares first Synchronization Status Message when comparing unit 3021 is less than or equal to the credit rating of the 3rd Synchronization Status Message, 302 first Synchronization Status Messages that send from Section Point 304 by a port (for example port one 1) reception that is connected with Section Point 304 on it of first node, and go up to Section Point 304 transmissions second Synchronization Status Message at other ports that are connected with Section Point 304 (for example port one 2-1n), simultaneously, 302 of first nodes send first Synchronization Status Message from Section Point 304 by the port (for example port 41) that is connected with the 3rd node 306 on it to the 3rd node 306, send second Synchronization Status Message and go up to the 3rd node 306 at other ports that are connected with the 3rd node 306 (for example port 42-4n); When the credit rating that compares first Synchronization Status Message when comparing unit 3021 is higher than the credit rating of the 3rd Synchronization Status Message, opposite with above-mentioned process of transmitting.
In addition, comparing unit 3021, the first transmitting elements 3022 and second transmitting element 3023 can also be independent of first node in the present embodiment, finish function corresponding and be arranged on a device separately.
Certainly, first transmitting element 3022 in the present embodiment and second transmitting element 3023 can also be arranged to a device and finish function corresponding.
The transmission system of the Synchronization Status Message of this preferred embodiment also is not limited to and comprises three nodes, and system can also comprise the node more than three, to the transmission of the Synchronization Status Message between the node more than three with above-mentioned consistent.For example, first node also connects the 4th node, so, select one tunnel optimum link respectively the link between link between link between first node and Section Point, first node and the 3rd node and first node and the 4th node, from the optimum link of every road, select one tunnel best link again, first node receives the Synchronication status message of the node transmission of this link correspondence by this best link, and this Synchronication status message is sent to the node of other optimum link correspondences by other optimum link.Other links except that optimum link of first node force to send second Synchronization Status Message respectively, and promptly credit rating is the state information on year-on-year basis of F.
Certainly, " first " in this preferred embodiment, " second " are only used for distinguishing different main bodys with " the 3rd ", and are not used in this main body of qualification.
Embodiment 2
Fig. 4 is according to the preferred knot flow chart of the transmission method of the Ethernet of the embodiment of the invention Synchronization Status Message in synchronously, comprising:
S402, first node receive first Synchronization Status Message from Section Point on every link between first node and the Section Point, wherein, the credit rating of first Synchronization Status Message is the credit rating of Section Point;
S404, if first node only connects Section Point, then first port of first node on it is set to receive only first Synchronization Status Message from second port on the Section Point, and with all of the port that Section Point is connected in send second Synchronization Status Message to Section Point on other ports except that first port, wherein, the credit rating of second Synchronization Status Message is different with first Synchronization Status Message, has a link between first port and second port.
For example, the first node in this preferred embodiment can be corresponding to the DUT1 among Fig. 1, and Section Point is corresponding to the DUT2 among Fig. 1, the link of the link that its first link is port one 1-21, the link of port one 2-22 and port one n-2n etc.
In this preferred embodiment, the multilink of switching equipment is divided into groups in employing, and select a link to carry out the transmission of Synchronization Status Message from every group, the problem that has solved, and then reached and prevent the Cheng Huan of multilink UNICOM, thereby the effect that Synchronization Status Message is transmitted smoothly downstream.
Preferably, after Section Point received second Synchronization Status Message, Section Point only sent first Synchronization Status Message to first port on second port.In this preferred embodiment, Section Point other ports except second port all do not send Synchronization Status Message to first node, have saved link circuit resource, have reduced the workload between the node.
Certainly, be not limited to the transmission method of two Synchronization Status Messages between the node in this preferred embodiment, the transmission method that also comprises three Synchronization Status Messages between the node, at this moment, if first node connects Section Point and the 3rd node, first node is the credit rating of credit rating and the 3rd Synchronization Status Message of the 3rd node transmission of first Synchronization Status Message that sends of Section Point relatively; If the credit rating of first Synchronization Status Message that Section Point sends is higher than the credit rating of the 3rd Synchronization Status Message of the 3rd node transmission, then first port of first node on it is set to receive only first Synchronization Status Message from second port on the Section Point, and with all of the port that Section Point is connected in send second Synchronization Status Message to Section Point on other ports except that first port, wherein, the credit rating of second Synchronization Status Message is different with first Synchronization Status Message; And first node the 3rd port that is used to connect the 3rd node on it is set to only send to the 4th port of the 3rd node first Synchronization Status Message of second port on Section Point, and with all of the port that the 3rd node is connected in send second Synchronization Status Message to the 3rd node on other ports except that the 3rd port.In this preferred embodiment, three nodes are arranged in transmission path, then three nodes link is between any two selected respectively, select link optimum between per two nodes, and between all optimum links, select the link of one tunnel the best, receive Synchronization Status Message at this best link, on the basis that prevents link Cheng Huan, saved link circuit resource.
Certainly, when if the credit rating of first Synchronization Status Message that Section Point sends is less than or equal to the credit rating of the 3rd Synchronization Status Message that the 3rd node sends, three port of first node on it is set to receive only the 3rd Synchronization Status Message from the 4th port on the 3rd node, and with all of the port that the 3rd node is connected in send second Synchronization Status Message to the 3rd node on other ports except that the 3rd port, wherein, the credit rating of second Synchronization Status Message is different with the 3rd Synchronization Status Message; And first node first port that is used to connect Section Point on it is set to only send to second port of Section Point the 3rd Synchronization Status Message of the 4th port on the 3rd node, and with all of the port that Section Point is connected in send second Synchronization Status Message to Section Point on other ports except that first port.In this preferred embodiment, three nodes are arranged in transmission path, then three nodes link is between any two selected respectively, select link optimum between per two nodes, and between all optimum links, select the link of one tunnel the best, on the link of the optimum outside the link of the best, send Synchronization Status Message, on the basis that prevents link Cheng Huan, save link circuit resource.
Preferably, the credit rating of comparison first Synchronization Status Message and the credit rating of the 3rd Synchronization Status Message are come in the Warning Mark position of the 3rd Synchronization Status Message of the Warning Mark position of first Synchronization Status Message that sends according to Section Point of the first node indication credit rating of carrying and the transmission of the 3rd node indication credit rating of carrying.In this preferred embodiment, adopt the Warning Mark position of the indication credit rating that Synchronization Status Message is carried to judge the credit rating of Synchronization Status Message, saved relatively flow process, reduced workload.
In the present embodiment, the process of transmitting that above-mentioned first transmitting element and second transmitting element carry out according to the comparative result of comparing unit, it is an example, form that the present invention is not limited thereto, for example: the credit rating that compares first Synchronization Status Message is less than or equal to the credit rating of the 3rd Synchronization Status Message, first node only receives first Synchronization Status Message that sends from Section Point by a port (for example port one 1) that is connected with Section Point on it, and upward send second Synchronization Status Message to Section Point at other ports that are connected with Section Point (for example port one 2-1n), simultaneously, first node only sends first Synchronization Status Message from Section Point by the port (for example port 41) that is connected with the 3rd node on it to the 3rd node, sends second Synchronization Status Message and go up at other ports that are connected with the 3rd node (for example port 42-4n) to the 3rd node; When the credit rating that compares first Synchronization Status Message is higher than the credit rating of the 3rd Synchronization Status Message, opposite with above-mentioned process of transmitting.
The transmission method of the Synchronization Status Message of this preferred embodiment also is not limited to three transmission between the node, can also comprise the transmission of the Synchronization Status Message between the node more than three, and this transmission method is with above-mentioned consistent.For example, first node also connects the 4th node, so, select one tunnel optimum link respectively the link between link between link between first node and Section Point, first node and the 3rd node and first node and the 4th node, from the optimum link of every road, select one tunnel best link again, first node receives the Synchronication status message of the node transmission of this link correspondence by this best link, and this Synchronication status message is sent to the node of other optimum link correspondences by other optimum link.Other links except that optimum link of first node force to send second Synchronization Status Message respectively, and promptly credit rating is the state information on year-on-year basis of F.
Certainly, " first " in this preferred embodiment, " second " are only used for distinguishing different main bodys with " the 3rd ", and are not used in this main body of qualification.
The transmission technology of the Synchronization Status Message during the Ethernet of the foregoing description 1 and embodiment 2 is synchronous can be on this basis of standard SSM agreement, by grouping to the SSM message, the election of grouping and force port outside the optimum source to send credit rating and realize that link packet prevents the Cheng Huan of synchronous ethernet.
Concerning with first node and Section Point, first node receives the SSM protocol massages, judge source MAC (the Medium Access Control of above-mentioned message, medium access control), if source MAC is identical, can think that then above-mentioned message comes from same node, for example: the message that the port of the Section Point that the port of first node is received sends just can assert that the port of Section Point is same source port.And the clock source of selecting a port correspondence in the port of first node is as the optimum clock source in the link packet of first node and Section Point, from the port of first node the clock source of a port correspondence of selection as first node with respect to the optimum clock source in the link packet of the 3rd node.
Select one road optimal clock source in the optimum clock source in the link packet of optimum clock source from the link packet of first node and Section Point and first node and the 3rd node; For example, optimum clock source in the link packet of selection first node and Section Point is as the optimal clock source, then this optimal clock source corresponding port receives first Synchronization Status Message that Section Point sends according to standard SSM agreement, first node sends first Synchronication status message to the 3rd node with respect to the optimum clock source corresponding port in the link packet of the 3rd node, thereby finish the process that first Synchronization Status Message is sent to the 3rd node from Section Point, it is the message of F that other ports in the link packet of first node and Section Point are forced to send credit rating, it is the message of F that other ports in the link packet of first node and the 3rd node are forced to send credit rating, credit rating is that the message of F is the credit rating of second Synchronization Status Message, wherein, this credit rating is that the message of F is used for indication: after receiving the message that this credit rating is F, the operation of clock setting with this port correspondence for not locking, that is, do not receive first Synchronication status message that Section Point sends or do not receive the operation of the 3rd Synchronication status message that the 3rd node sends.
Adopt the synchronous ethernet of above-mentioned link packet, can avoid causing the reverse UNICOM of Synchronization Status Message Cheng Huan, standard SSM agreement can be used in the network environment of multilink UNICOM normally.
Embodiment 3
Based on the network configuration of Fig. 3, Fig. 5 has shown the another kind of flow chart of the transmission method of the Synchronization Status Message of Ethernet in synchronously, and wherein, DUT1 can be first node, and DUT2 can be Section Point.The transmission method of the Synchronization Status Message during Ethernet as shown in Figure 5 is synchronous comprises the steps:
S501:DUT1 sole mass grade is 2, and configured port 11 is to the multilink of port one n, and to the port arrangement corresponding clock source of every link, plays automatic SSM algorithm, just according to the running of standard SSM agreement, promptly carries out the transmission of Synchronization Status Message.
S502:DUT2 sole mass grade is 4, and configured port 21 is to the multilink of port 2n, and to the port arrangement corresponding clock source of every link, plays automatic SSM algorithm, promptly carries out the transmission of Synchronization Status Message.
Here it should be noted that, not only comprise two DUT equipment in the system, can also dispose the multilink UNICOM of multiple devices, just can not only comprise two equipment of first node and Section Point, can also comprise a plurality of nodes such as the 3rd node, certainly, when comprising a plurality of nodes, also need port arrangement corresponding clock source to the link between each node.
Below the transmission example of the Synchronization Status Message that comprises three node systems is described:
The all of the port of S503:DUT1 is received the SSM message of opposite end, the reference source MAC Address, and this opposite end comprises DUT2 and DUT3.For example: all of the port of first node (for example port one 1-1n and port 41-4n) receives the port (for example port 21-2n) that is connected with the port of first node from Section Point and the SSM message that sends the port (for example port 31-3n) that the 3rd node is connected with the port of first node, the relatively MAC Address of SSM message.
S504: according to the source MAC grouping of message.The port of homology divides at same group, the port that just comes from same node belongs to the port of homology, for example: the port of Section Point (for example port 21-2n) belongs to a grouping, the port of the 3rd node (for example port 31-3n) belongs to a grouping, in the grouping a plurality of ports can be arranged, also can have only a port.
Be connected by two links with Section Point with first node below and first node and the 3rd node are connected to the transmission course that example describes Synchronization Status Message by a link, for example: first node links to each other by two links with Section Point, the port one 1 of first node links to each other with the port one 2 of Section Point, the port one 2 of first node and the port 22 of Section Point link to each other, the port 41 of first node links to each other with the port 31 of the 3rd node, and this transmission course also is applicable to other connection situations certainly.
Have a plurality of situations for a grouping, carry out S505, have only a situation, carry out S506 with source port for a grouping with source port.
S505: for a plurality of groupings with source port are arranged, elect the optimum clock source of this grouping middle port correspondence according to standard SSM agreement, for example: the clock source that elects port one 1 correspondence of first node is optimum clock source.After executing S505, go to S507.
S506: for the grouping of having only a port, this port is directly participated in the election of, and for example: the clock source of port 41 correspondences of first node is directly as optimum clock source.After executing S506, go to S507
S507:DUT1 equipment is elected wherein best clock source with the clock source of all grouping elections according to standard SSM agreement, the source that will lock as DUT1, for example: in the optimum clock source of port 41 correspondences of the optimum clock source of port one 1 correspondence of first node and first node, select an optimal clock source (for example port one 1), this optimal clock source is as the locking source, and just this optimal clock source corresponding port (for example port one 1) receives only the Synchronization Status Message of port (for example port 21) transmission of the node that is connected with this port.
At this moment, DUT1 has selected corresponding clock source (for example port one 1).Next to DUT1 to downstream node (for example DUT3) process of transmitting Synchronization Status Message describe:
Have a plurality of situations for a grouping, carry out S508, have a situation, carry out S509 with source port for a grouping with source port.
S508: for a plurality of groupings with source port among the S505, other ports pressure transmission credit ratings that are not elected as optimum clock source are the Synchronization Status Message of F.For example, the port one 2 pressure transmission credit ratings of first node are the port 22 of the Synchronization Status Message of F to Section Point.The port (for example port one 1 and port 41) in the optimum clock source of election is according to standard SSM agreement, judge whether optimum clock source is chosen as the locking source of DUT1, if the clock source that this port (for example port one 1) is corresponding is selected as the locking source of DUT1, this port (for example port one 1) then receives only the Synchronization Status Message that send corresponding port (for example port 21 of Section Point): if the corresponding clock source of this port (for example port 41) is not chosen as locking source (the clock source that is port 41 correspondences only is optimum clock source) by DUT1, this port (for example port 41) (for example the 3rd node) then downstream sends Synchronization Status Message, and this Synchronization Status Message carries the credit rating in DUT1 locking source (for example clock source of port one 1 correspondence).That is to say, after selecting optimum clock source, for example the clock source that port one 1 and port 41 are corresponding respectively all is selected as optimum clock source, the clock source of port one 1 correspondence of first node judges whether self is locking source (being the optimal clock source), if, then port one 1 receives only the Synchronization Status Message that Section Point port 21 sends, if not (being that optimal clock source corresponding port is a port 41), then port one 1 sends Synchronization Status Message that the port 31 of the 3rd node that receives from port 41 the sends port 21 to Section Point.After executing S508, go to S510.
S509: for the port grouping of having only among the S506, according to standard SSM agreement, judge whether the clock source of this port (for example port 41) is chosen as the locking source of DUT1, if be selected as the locking source of DUT1, then this port (for example port 41) only receives the Synchronization Status Message that send corresponding port (for example port 31); If do not chosen as the locking source by DUT1, (for example Section Point) sends Synchronization Status Message then to downstream node, and this Synchronization Status Message carries the credit rating in DUT1 locking source (being the clock source of port 41 correspondences).That is to say, the clock source of port 41 correspondences of first node judges whether self is the locking source, it is the optimal clock source, if then receive only the Synchronication status message that the port 31 of the 3rd node sends, if not then the Synchronization Status Message that sends of the port 21 of the Section Point that receives of transmit port 11 is given the port 31 of the 3rd node.After executing S509, go to S510.
The port one 1 of S510:DUT1 and port one 2 are a grouping, and DUT1 election port one 1 is the equipment clock source, promptly locks the source, and port one 1 just receives only the Synchronization Status Message that port 21 transmits so, and it is the Synchronization Status Message of F that port one 2 can outwards send credit rating.The port 22 of DUT2 is received this message, because grade is F, therefore, this port 22 can not be as the participation in the election source, so the DUT2 self-vibration.That is to say that other ports of DUT2 (for example 21-2n) can not judged the Synchronization Status Message that self receives, and the clock source of selecting the port correspondence is as the locking source, therefore stoped first node and Section Point because multilink is formed by connecting ring.For DUT3 also is same processing procedure.
It is stable that S511:DUT1 and DUT2 all reach, and can expand to the method for the Synchronization Status Message transmission between the multiple devices thus, thereby realize that the whole network is synchronous.
From above description, as can be seen, the present invention has realized following technique effect: adopt the multilink with switching equipment to divide into groups, and from every group, select a link to carry out the transmission of Synchronization Status Message, the problem that has solved, and then reached and prevent the Cheng Huan of multilink UNICOM, thereby the effect that Synchronization Status Message is transmitted smoothly downstream.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and carry out by calculation element, and in some cases, can carry out step shown or that describe with the order that is different from herein, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the transmission method of the Ethernet Synchronization Status Message in synchronously is characterized in that, comprising:
First node receives first Synchronization Status Message from described Section Point on every link between described first node and the Section Point, wherein, the credit rating of described first Synchronization Status Message is the credit rating of described Section Point;
If described first node only connects described Section Point, first port of then described first node on it is set to receive only described first Synchronization Status Message from second port on the described Section Point, and with all of the port that described Section Point is connected in send second Synchronization Status Message to described Section Point on other ports except that described first port, wherein, the credit rating of described second Synchronization Status Message is different with described first Synchronization Status Message, has a described link between described first port and described second port.
2. method according to claim 1 is characterized in that, after described Section Point receives described second Synchronization Status Message, also comprises:
Described Section Point only sends described first Synchronization Status Message to described first port on described second port.
3. method according to claim 1 is characterized in that, also comprises:
If described first node connects described Section Point and the 3rd node, the credit rating of the 3rd Synchronization Status Message that the credit rating of described first Synchronization Status Message that the more described Section Point of described first node sends and described the 3rd node send;
If the credit rating of described first Synchronization Status Message that described Section Point sends is higher than the credit rating of the 3rd Synchronization Status Message of described the 3rd node transmission, described first port of then described first node on it is set to receive only described first Synchronization Status Message from described second port on the described Section Point, and with all of the port that described Section Point is connected in send described second Synchronization Status Message to described Section Point on other ports except that described first port, wherein, the credit rating of described second Synchronization Status Message is different with described first Synchronization Status Message; And described first node the 3rd port that is used to connect described the 3rd node on it is set to only send to the 4th port of described the 3rd node first Synchronization Status Message of second port on described Section Point, and with all of the port that described the 3rd node is connected in send described second Synchronization Status Message to described the 3rd node on other ports except that described the 3rd port.
4. method according to claim 3 is characterized in that, if the credit rating of described first Synchronization Status Message that described Section Point sends is less than or equal to the credit rating of the 3rd Synchronization Status Message of described the 3rd node transmission, described method also comprises:
Described three port of described first node on it is set to receive only described the 3rd Synchronization Status Message from described the 4th port on described the 3rd node, and with all of the port that described the 3rd node is connected in send described second Synchronization Status Message to described the 3rd node on other ports except that described the 3rd port, wherein, the credit rating of described second Synchronization Status Message is different with described the 3rd Synchronization Status Message; And described first node described first port that is used to connect described Section Point on it is set to only send to described second port of described Section Point described the 3rd Synchronization Status Message of described the 4th port on described the 3rd node, and with all of the port that described Section Point is connected in send described second Synchronization Status Message to described Section Point on other ports except that described first port.
5. method according to claim 3, it is characterized in that the credit rating of more described first Synchronization Status Message and the credit rating of described the 3rd Synchronization Status Message are come in the Warning Mark position of the indication credit rating that the 3rd Synchronization Status Message that the Warning Mark position of the indication credit rating that described first Synchronization Status Message that described first node sends according to described Section Point carries and described the 3rd node send carries.
6. the transmission system of the Ethernet Synchronization Status Message in synchronously is characterized in that, comprising: first node and Section Point, wherein:
Described Section Point is used for sending first Synchronization Status Message to described first node on every first link between described first node and the described Section Point, wherein, the credit rating of described first Synchronization Status Message is the credit rating of described Section Point;
Described first node is used for when described first node only connects described Section Point, first port on it is set to receive only described first Synchronization Status Message from second port on the described Section Point, and with all of the port that described Section Point is connected in send second Synchronization Status Message to described Section Point on other ports except that described first port, wherein, the credit rating of described second Synchronization Status Message is different with described first Synchronization Status Message, has described first link between described first port and described second port.
7. system according to claim 6 is characterized in that, described Section Point also is used for after receiving described second Synchronization Status Message, only sends described first Synchronization Status Message to described first port on described second port.
8. system according to claim 6, it is characterized in that, also comprise: the 3rd node that connects described first node, be used on every second link between described first node and described the 3rd node, sending the 3rd Synchronization Status Message, wherein, the credit rating of described the 3rd Synchronization Status Message is the credit rating of described the 3rd node;
Wherein, described first node comprises: the comparing unit of Lian Jieing and first transmitting element successively, wherein,
Described comparing unit is used for the credit rating of described first Synchronization Status Message that more described Section Point sends and the credit rating of described the 3rd Synchronization Status Message of described the 3rd node transmission;
Described first transmitting element is used for when the credit rating of described first Synchronization Status Message is higher than the credit rating of described the 3rd Synchronization Status Message, described first port of described first node is set to receive only described first Synchronization Status Message from described second port of described Section Point, and with all of the port that described Section Point is connected in send described second Synchronization Status Message to described Section Point on other ports except that described first port, wherein, the credit rating of described second Synchronization Status Message is different with described first Synchronization Status Message; And being used in the described first node the 3rd port that connects described the 3rd node be set to only send described first Synchronization Status Message of second port on described Section Point to the 4th port of described the 3rd node, and with all of the port that described the 3rd node is connected in send described second Synchronization Status Message to described the 3rd node on other ports except that described the 3rd port.
9. system according to claim 8 is characterized in that, described first node also comprises:
Second transmitting element that connects comparing unit, be used for when the credit rating of described first Synchronization Status Message is less than or equal to the credit rating of described the 3rd Synchronization Status Message, described the 3rd port of described first node is set to receive only described the 3rd Synchronization Status Message from described the 4th port on described the 3rd node, and with all of the port that described the 3rd node is connected in send described second Synchronization Status Message to described the 3rd node on other ports except that described the 3rd port, wherein, the credit rating of described second Synchronization Status Message is different with described the 3rd Synchronization Status Message; And being used in the described first node described first port that connects described Section Point be set to only send described the 3rd Synchronization Status Message of described the 4th port on described the 3rd node to described second port of described Section Point, and with all of the port that described Section Point is connected in send described second Synchronization Status Message to described Section Point on other ports except that described first port.
10. system according to claim 8, it is characterized in that the credit rating of more described first Synchronization Status Message and the credit rating of described the 3rd Synchronization Status Message are come with the Warning Mark position of the indication credit rating that the 3rd Synchronization Status Message of described the 3rd node transmission carries in the Warning Mark position that described comparing unit also is used for the indication credit rating of carrying according to described first Synchronization Status Message that described Section Point sends.
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| CN201110088388.1A CN102158412B (en) | 2011-04-08 | 2011-04-08 | Transmission method and system of synchronous state information in Ethernet synchronization |
| PCT/CN2012/071932 WO2012136085A1 (en) | 2011-04-08 | 2012-03-05 | Transmission method and system for synchronous state information in ethernet synchronization |
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| CN102404102A (en) * | 2011-11-16 | 2012-04-04 | 中兴通讯股份有限公司 | Method and device for synchronizing Ethernet |
| WO2012136085A1 (en) * | 2011-04-08 | 2012-10-11 | 中兴通讯股份有限公司 | Transmission method and system for synchronous state information in ethernet synchronization |
| CN103716106A (en) * | 2012-09-28 | 2014-04-09 | 华为技术有限公司 | Clock synchronization method, system and apparatus |
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| CN1507227A (en) * | 2002-12-12 | 2004-06-23 | 华为技术有限公司 | Method of preventing formation of timing loop in synchronous network |
| CN101068133A (en) * | 2007-06-12 | 2007-11-07 | 华为技术有限公司 | Time synchronizing method, network communication system and equipment and time server thereof |
| CN101547085A (en) * | 2009-04-29 | 2009-09-30 | 华为技术有限公司 | Physical layer port master-slave configuration method, device and communication system |
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Patent Citations (3)
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|---|---|---|---|---|
| CN1507227A (en) * | 2002-12-12 | 2004-06-23 | 华为技术有限公司 | Method of preventing formation of timing loop in synchronous network |
| CN101068133A (en) * | 2007-06-12 | 2007-11-07 | 华为技术有限公司 | Time synchronizing method, network communication system and equipment and time server thereof |
| CN101547085A (en) * | 2009-04-29 | 2009-09-30 | 华为技术有限公司 | Physical layer port master-slave configuration method, device and communication system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2012136085A1 (en) * | 2011-04-08 | 2012-10-11 | 中兴通讯股份有限公司 | Transmission method and system for synchronous state information in ethernet synchronization |
| CN102404102A (en) * | 2011-11-16 | 2012-04-04 | 中兴通讯股份有限公司 | Method and device for synchronizing Ethernet |
| CN102404102B (en) * | 2011-11-16 | 2017-07-21 | 南京中兴软件有限责任公司 | A kind of method and apparatus of synchronous ethernet |
| CN103716106A (en) * | 2012-09-28 | 2014-04-09 | 华为技术有限公司 | Clock synchronization method, system and apparatus |
| US9641268B2 (en) | 2012-09-28 | 2017-05-02 | Huawei Technologies Co., Ltd. | Method, system and device for synchronizing clocks |
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| WO2012136085A1 (en) | 2012-10-11 |
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