CN102158412B - 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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/407—Bus networks with decentralised control
- H04L12/413—Bus networks with decentralised control with random access, e.g. carrier-sense multiple-access with collision detection [CSMA-CD]
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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, the transmission method of the Synchronization Status Message in synchronous in particular to a kind of Ethernet and system.
Background technology
At telco service provider's network in the evolution of next generation network, Ethernet progressively will 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, (wireless base station and TDM (Time Division Multiplex and Multiplexer is comprised in the application of ask for something stringent synchronization, time division multiplexing and multiplexer circuit emulation (CES:Circuit Emulation Service) equipment) in, telco service provider will face how by the challenge of Ethernet transmission high-quality clock synchronous.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 one-level reference clock signal its bit clock synchronous.2006, International Telecommunication Union its G.8261 in describe SyncE concept.2007, in G 8262, standardization is carried out to SyncE performance requirement.Define the minimum performance requirement of the clock used in the synchronous ethernet network equipment.
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 synchronous ethernet link and come voice-over, data, video and traditional business.
And the key technology realizing synchronous ethernet is exactly Synchronization Status Message, Synchronization Status Message (SSM:SynchronizationStatus Message) exchanges downstream ether and provides the mechanism of determining to follow the tracks of synchronous allocative decision and return PRC (PrimaryReference Clock, Primary Reference Clock) or utilize higher-quality clock.Synchronizing function is by treatment S SM.Under upstream network malfunction, synchronizing function takes suitable operation according to SSM and preset priority.Another is selected synchronously to supply.This may be the supply of another network or outside supply.SSM is defined by G 707.
Such as, but due to the message format of Synchronization Status Message and the restriction of the method for synchronization, at present in many specific environment, Synchronization Status Message there will be into the situation of ring, looped network, multilink is communicated with etc.
For the networking of Fig. 1, 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 the link wherein between DUT1 102 and DUT2 104 more than two links and/or two links is connected.Be described with the example that is transmitted as of carrying out Synchronization Status Message by two links between DUT1 102 and DUT2 104 below, the step that above two network elements perform is as follows:
S201:DUT1 (Device Under Test, measured device) 102 sole mass grades are 2, configured port 11 and port one 2 two links, port one 1 and port one 2 be a corresponding clock source respectively, plays the transmission that automatic SSM algorithm carries out Synchronization Status Message;
S202:DUT2 104 sole mass grade is 4, configured port 21 and port 22 two links, and port 21 and port 22 be a corresponding clock source respectively, plays the transmission that automatic SSM algorithm carries out Synchronization Status Message; Wherein, port one 1 and port 21 form a link, and port one 2 and port 22 form a link;
S203:DUT1 102 port one 1 and port one 2 receive the SSM message that DUT2 104 sends, and carrying credit rating is the priority of 4, DUT1 102 according to configuration, selects port 11 to be clock source;
S204: after at this moment the port one 1 of DUT1 102 is selected as source, credit rating 4 will be transmitted to downstream by SSM message by port one 2.;
The port 22 of S205:DUT2 104 have received the SSM message that DUT1 102 sends, and port 22 will be selected to clock source and lock;
It is that the clock source of the port of 4 is as locking source that S206:DUT1 102 and DUT2 104 have selected quality of reception grade simultaneously, now, on two links between DUT1 and DUT2, there are two locking sources, namely the locking source of the credit rating of DUT2 104 self is actually, between such DUT1 and DUT2, port 21 sends to port one 1 Synchronization Status Message that credit rating is 4, port one 2 sends to port 22 Synchronization Status Message that credit rating is 4, thus define " loop " between two equipment, cause the equal losing lock in last two ends.
As can be seen from the above step, two network element clocks in Fig. 1 networking cannot be synchronous, can bring have a strong impact on regular traffic.
Summary of the invention
The transmission method of the Synchronization Status Message during main purpose of the present invention is to provide a kind of Ethernet synchronous and system, become ring to solve in prior art Synchronization Status Message when multilink UNICOM, cause the problem of network element losing lock.
According to an aspect of the present invention, provide a kind of Ethernet synchronous in the transmission method of Synchronization Status Message, comprise: the every bar link of first node between described first node and Section Point receives the first Synchronization Status Message from described 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, then the first port on it is set to receive only described first Synchronization Status Message from the second port on described Section Point by described first node, and other ports in all of the port be connected with described Section Point except described first port send the second Synchronization Status Message to described Section Point, wherein, the credit rating of described second Synchronization Status Message is different from described first Synchronization Status Message, there is a described link between described first port and described second port.
Further, after described Section Point receives described second Synchronization Status Message, the transmission method of the Synchronization Status Message during Ethernet is synchronous also comprises: described Section Point only sends 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, 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 3rd node send, if the credit rating of the 3rd Synchronization Status Message that the credit rating of described first Synchronization Status Message that described Section Point sends sends higher than described 3rd node, then described first port on it is set to receive only described first Synchronization Status Message from described second port on described Section Point by described first node, and other ports in all of the port be connected with described Section Point except described first port send described second Synchronization Status Message to described Section Point, wherein, the credit rating of described second Synchronization Status Message is different from described first Synchronization Status Message, and described first node is set to for the 3rd port connecting described 3rd node the first Synchronization Status Message only sending the second port on described Section Point to the 4th port of described 3rd node by it, and other ports in all of the port be connected with described 3rd node except described 3rd port send described second Synchronization Status Message to described 3rd node.
Further, if the credit rating of the 3rd Synchronization Status Message that the credit rating of described first Synchronization Status Message that described Section Point sends sends less than or equal to described 3rd node, described method also comprises: described 3rd port on it is set to receive only described 3rd Synchronization Status Message from described 4th port on described 3rd node by described first node, and other ports in all of the port be connected with described 3rd node except described 3rd port send described second Synchronization Status Message to described 3rd node, wherein, the credit rating of described second Synchronization Status Message is different from described 3rd Synchronization Status Message, and described first node is set to for described first port connecting described Section Point described 3rd Synchronization Status Message only sending described 4th port on described 3rd node to described second port of described Section Point by it, and other ports in all of the port be connected with described Section Point except described first port send described second Synchronization Status Message to described Section Point.
Further, the Warning Mark position of the instruction credit rating that the Warning Mark position of instruction credit rating that described first node carries according to described first Synchronization Status Message that described Section Point sends is carried with the 3rd Synchronization Status Message that described 3rd node sends is to the credit rating of the credit rating of more described first Synchronization Status Message and described 3rd Synchronization Status Message.
According to a further aspect in the invention, provide a kind of Ethernet synchronous in the transmission system of Synchronization Status Message, comprise: first node and Section Point, wherein: described Section Point sends the first Synchronization Status Message to described first node on every bar first link between described first node and 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, the first port on it is set to receive only described first Synchronization Status Message from the second port on described Section Point, and other ports in all of the port be connected with described Section Point except described first port send the second Synchronization Status Message to described Section Point, wherein, the credit rating of described second Synchronization Status Message is different from described first Synchronization Status Message, there is described first link between described first port and described second port.
Further, described Section Point, also 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 connecting described first node, the 3rd Synchronization Status Message is sent on every article of second link between described first node and described 3rd node, wherein, the credit rating of described 3rd Synchronization Status Message is the credit rating of described 3rd node, wherein, described first node comprises: the comparing unit connected successively and the first transmitting element, wherein, comparing unit is used for the credit rating of described 3rd Synchronization Status Message that the credit rating of described first Synchronization Status Message that more described Section Point sends and described 3rd node send, first transmitting element is used for when credit rating higher than described 3rd Synchronization Status Message of the credit rating of described first 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 other ports in all of the port be connected with described Section Point except described first port send described second Synchronization Status Message to described Section Point, wherein, the credit rating of described second Synchronization Status Message is different from described first Synchronization Status Message, and will be set to for the 3rd port connecting described 3rd node described first Synchronization Status Message only sending the second port on described Section Point to the 4th port of described 3rd node in described first node, and other ports in all of the port be connected with described 3rd node except described 3rd port send described second Synchronization Status Message to described 3rd node.
Further, described first node also comprises: the second transmitting element connecting comparing unit, for when credit rating less than or equal to described 3rd Synchronization Status Message of the credit rating of described first Synchronization Status Message, described 3rd port of described first node is set to receive only described 3rd Synchronization Status Message from described 4th port on described 3rd node, and other ports in all of the port be connected with described 3rd node except described 3rd port send described second Synchronization Status Message to described 3rd node, wherein, the credit rating of described second Synchronization Status Message is different from described 3rd Synchronization Status Message, and will be set to for described first port connecting described Section Point described 3rd Synchronization Status Message only sending described 4th port on described 3rd node to described second port of described Section Point in described first node, and other ports in all of the port be connected with described Section Point except described first port send described second Synchronization Status Message to described Section Point.
Further, the Warning Mark position of the instruction credit rating that the Warning Mark position of instruction credit rating that described comparing unit also carries for described first Synchronization Status Message sent according to described Section Point is carried with the 3rd Synchronization Status Message that described 3rd node sends is to the credit rating of the credit rating of more described first Synchronization Status Message and described 3rd Synchronization Status Message.
Pass through the present invention, adopt and the multilink of switching equipment is divided into groups, and from every group, select a link to carry out the transmission of Synchronization Status Message, the problem solved, and then reach and prevent multilink UNICOM Cheng Huan, thus make the effect that Synchronization Status Message transmits to downstream smoothly.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation 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 be synchronous according to the Ethernet of the embodiment of the present invention in the preferred structure block diagram of transmission system of Synchronization Status Message;
Fig. 4 be synchronous according to the Ethernet of the embodiment of the present invention in the preferred flow charts of transmission method of Synchronization Status Message;
Fig. 5 be synchronous according to the Ethernet of the embodiment of the present invention in the another kind of flow chart of transmission method of Synchronization Status Message.
Embodiment
Hereinafter also describe the present invention in detail with reference to accompanying drawing in conjunction with the embodiments.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.
Embodiment 1
Fig. 3 be synchronous according to the Ethernet of the embodiment of the present invention in the preferred structure block diagram of transmission system of Synchronization Status Message, comprising: first node 302 and Section Point 304, wherein:
Section Point 304 sends the first Synchronization Status Message to first node 302 on every bar first link between first node 302 and Section Point 304, and wherein, the credit rating of the first Synchronization Status Message is the credit rating of Section Point;
First node 302 is for when first node 302 connects Section Point 304, the first port (such as port one 1) on it is set to receive only the first Synchronization Status Message from the second port (such as port 21) on Section Point 304, and other ports (such as port one 2-1n) in all of the port be connected with Section Point 304 except the first port send the second Synchronization Status Message to Section Point 304, wherein, the credit rating of the second Synchronization Status Message is different from the first Synchronization Status Message, first link is there is between first port and the second port.
In this preferred embodiment, adopt and the multilink of switching equipment is divided into groups, and from every group, select a link to carry out the transmission of Synchronization Status Message, the problem solved, and then reach and prevent multilink UNICOM Cheng Huan, thus make the effect that Synchronization Status Message transmits to downstream smoothly.
Wherein, the credit rating of the second Synchronization Status Message, for can be set to F, is used to indicate Section Point 304 and only sends the first Synchronization Status Message to the first port on the second port.
First node 302 in this preferred embodiment can correspond to the DUT1 in Fig. 1, and Section Point 304 corresponds to the DUT2 in Fig. 1, and its first link comprises the link between port one i-port 2i, wherein, i=1,2 ... n.
Preferably, Section Point 304, after receiving the second Synchronization Status Message, only sends the first Synchronization Status Message to the first port on the second port.In this preferred embodiment, other ports (such as port 22-2n) except the second port (such as port 21) on Section Point 304 all do not send Synchronization Status Message to first node, ensure that and only adopt a link transmission Synchronization Status Message between Section Point 304 and first node 302, avoid the formation of loop, can successfully just Synchronization Status Message transmit.Certainly, the present invention is not limited thereto, such as: at Section Point 304 after receiving the second Synchronization Status Message, other ports (such as port 22-2n) except the second port (such as port 21) on Section Point 304 all do not send Synchronization Status Message to first node 302, but send other information or data.
Certainly, the present embodiment is not limited to two nodes, the transmission system of the Synchronization Status Message in synchronous according to the Ethernet of the embodiment of the present invention can also comprise three nodes, as shown in Figure 3,3rd node 306 of first node 302, the Section Point 304 connecting first node 302 and connection first node 302, every article second link of 3rd node 306 between first node 302 and the 3rd node 306 sends the 3rd Synchronization Status Message, wherein, the credit rating of the 3rd Synchronization Status Message is the credit rating of the 3rd node.In the present embodiment, the second link comprises the link between port 4i to port 3i, wherein, i=1,2 ... n.
In this preferred embodiment, when comprising three nodes, first node 302 comprises: the comparing unit 3021 connected successively and the first transmitting element 3022, wherein, comparing unit 3021 and the first transmitting element 3022 can by following steps carry out Ethernet synchronous in the transmission of Synchronization Status Message:
Comparing unit 3021 compares the credit rating of the credit rating of the first Synchronization Status Message that Section Point sends and the 3rd Synchronization Status Message that the 3rd node sends, first transmitting element 3022 is when the credit rating of the credit rating that comparing unit 3021 compares the first Synchronization Status Message higher than the 3rd Synchronization Status Message, first port (such as port one 1) of first node 302 is set to receive only the first Synchronization Status Message from second port (such as port 21) of Section Point 304, and other ports (such as port one 2-1n) in all of the port be connected with Section Point 304 except the first port send the second Synchronization Status Message to Section Point 304, wherein, the credit rating of the second Synchronization Status Message is different from the first Synchronization Status Message, and the 3rd port (such as port 41) being connected the 3rd node 306 being used in first node 302 is set to the first Synchronization Status Message only sending the second port (such as port 21) on Section Point 304 to the 4th port (such as port 31) of the 3rd node 306, and other ports (such as port 42-4n) in all of the port be connected with the 3rd node 306 except the 3rd port send the second Synchronization Status Message to the 3rd node 306.In the preferred embodiment, there are three nodes in a transmission path, then three nodes link is between any two selected respectively, select link optimum between every two nodes, and between the link of all optimums, select the link of a road the best, receive Synchronization Status Message at the link of this best, on the basis preventing link Cheng Huan, save link circuit resource.
Preferably, first node 302 also comprises: the second transmitting element 3023 connecting comparing unit 3021.Above-mentioned synchronous to Ethernet in the carrying out of the Synchronization Status Message basis of transmitting on, if during the credit rating of the credit rating that comparing unit 3021 compares the first Synchronization Status Message less than or equal to the 3rd Synchronization Status Message, then the 3rd port (such as port 41) of first node 302 is set to receive only the 3rd Synchronization Status Message from the 4th port (such as port 31) on the 3rd node 306 by the second transmitting element 3023, and other ports (such as port 42-4n) in all of the port be connected with the 3rd node 306 except the 3rd port send the second Synchronization Status Message to the 3rd node 306, wherein, the credit rating of the second Synchronization Status Message is different from the 3rd Synchronization Status Message, and second transmitting element 3023 the first port (such as port one 1) of being connected Section Point 304 being used in first node 302 be set to the 3rd Synchronization Status Message only sending the 4th port (such as port 31) on the 3rd node 306 to second port (such as port 21) of Section Point 304, and other ports (such as port one 2-1n) in all of the port be connected with Section Point 304 except the first port send the second Synchronization Status Message to Section Point 304.In the preferred embodiment, owing to there being three nodes in transmission path, therefore three nodes link is between any two selected respectively, select link optimum between every two nodes, and between the link of all optimums, select the link of a road the best, the link of the optimum outside the link of the best sends Synchronization Status Message, thus saved link circuit resource on the basis preventing link Cheng Huan.
Preferably, the credit rating of the first Synchronization Status Message and the credit rating of the 3rd Synchronization Status Message are compared in the Warning Mark position of the instruction credit rating that the Warning Mark position of instruction credit rating that comparing unit 3021 carries according to the first Synchronization Status Message that Section Point 304 sends is carried with the 3rd Synchronization Status Message that the 3rd node 306 sends.In the preferred embodiment, adopt the credit rating carrying out judging Synchronization Status Message to the Warning Mark position of the instruction credit rating that Synchronization Status Message carries, saved and compared flow process, decreased workload.
In the present embodiment, the process of transmitting that above-mentioned first transmitting element and the second transmitting element carry out according to the comparative result of comparing unit, a just example, form that the present invention is not limited thereto, such as: when comparing unit 3021 compares the credit rating of credit rating less than or equal to the 3rd Synchronization Status Message of the first Synchronization Status Message, first node 302 receives by the port (such as port one 1) that it is connected with Section Point 304 the first Synchronization Status Message sent from Section Point 304, and the second Synchronization Status Message is sent to Section Point 304 on other ports be connected with Section Point 304 (such as port one 2-1n), simultaneously, first node 302 sends the first Synchronization Status Message from Section Point 304 by a port (such as port 41) that it is connected with the 3rd node 306 to the 3rd node 306, and the second Synchronization Status Message is sent to the 3rd node 306 on other ports (such as port 42-4n) be connected with the 3rd node 306, when the credit rating of the credit rating that comparing unit 3021 compares the first Synchronization Status Message higher than the 3rd Synchronization Status Message, contrary with above-mentioned process of transmitting.
In addition, comparing unit 3021 in the present embodiment, the first transmitting element 3022 and the second transmitting element 3023 independent of first node, and can also be arranged on separately a device to complete corresponding function.
Certainly, the first transmitting element 3022 in the present embodiment and the second transmitting element 3023 can also be arranged to a device to complete corresponding function.
The transmission system of the Synchronization Status Message of this preferred embodiment is also not limited to and comprises three nodes, and system can also comprise the node of more than three, consistent with above-mentioned to the transmission of the Synchronization Status Message between the nodes of more than three.Such as, first node also connects the 4th node, so, a road optimum link is selected respectively from the link between first node and Section Point, the link between first node and the 3rd node and the link between first node and the 4th node, a road best link is selected in the optimum link of Zai Congmei road, first node receives by this best link the Synchronication status message that node corresponding to this link send, and by node that this Synchronication status message sends to other optimum link corresponding by other optimum link.Other links except optimum link of first node force transmission second Synchronization Status Message respectively, and namely credit rating is the state information on year-on-year basis of F.
Certainly, " first ", " second " and " the 3rd " in this preferred embodiment is only used for distinguishing different main bodys, and is not used in this main body of restriction.
Embodiment 2
Fig. 4 be synchronous according to the Ethernet of the embodiment of the present invention in the preferred knot flow chart of transmission method of Synchronization Status Message, comprising:
S402, the every bar link of first node between first node and Section Point receives the first Synchronization Status Message from Section Point, and wherein, the credit rating of the first Synchronization Status Message is the credit rating of Section Point;
S404, if first node only connects Section Point, then the first port on it is set to receive only the first Synchronization Status Message from the second port on Section Point by first node, and other ports in all of the port be connected with Section Point except the first port send the second Synchronization Status Message to Section Point, wherein, the credit rating of the second Synchronization Status Message is different from the first Synchronization Status Message, there is a link between the first port and the second port.
Such as, the first node in this preferred embodiment can correspond to the DUT1 in Fig. 1, and Section Point corresponds to the DUT2 in Fig. 1, and its first link is the link etc. of the link of port one 1-21, the link of port one 2-22 and port one n-2n.
In this preferred embodiment, adopt and the multilink of switching equipment is divided into groups, and from every group, select a link to carry out the transmission of Synchronization Status Message, the problem solved, and then reach and prevent multilink UNICOM Cheng Huan, thus make the effect that Synchronization Status Message transmits to downstream smoothly.
Preferably, after Section Point receives the second Synchronization Status Message, Section Point only sends the first Synchronization Status Message to the first port on the second port.In this preferred embodiment, Section Point other ports except the second port all do not send Synchronization Status Message to first node, have saved link circuit resource, have decreased the workload between node.
Certainly, the transmission method of the Synchronization Status Message between two nodes is not limited in this preferred embodiment, also comprise the transmission method of the Synchronization Status Message between three nodes, now, if first node connects Section Point and the 3rd node, first node compares the credit rating of the 3rd Synchronization Status Message that the credit rating of the first Synchronization Status Message that Section Point sends and the 3rd node send; If the credit rating of the 3rd Synchronization Status Message that the credit rating of the first Synchronization Status Message that Section Point sends sends higher than the 3rd node, then the first port on it is set to receive only the first Synchronization Status Message from the second port on Section Point by first node, and other ports in all of the port be connected with Section Point except the first port send the second Synchronization Status Message to Section Point, wherein, the credit rating of the second Synchronization Status Message is different from the first Synchronization Status Message; And first node is set to for the 3rd port connecting the 3rd node the first Synchronization Status Message only sending the second port on Section Point to the 4th port of the 3rd node by it, and other ports in all of the port be connected with the 3rd node except the 3rd port send the second Synchronization Status Message to the 3rd node.In the preferred embodiment, there are three nodes in a transmission path, then three nodes link is between any two selected respectively, select link optimum between every two nodes, and between the link of all optimums, select the link of a road the best, receive Synchronization Status Message at the link of this best, on the basis preventing link Cheng Huan, save link circuit resource.
Certainly, if during the credit rating of the 3rd Synchronization Status Message that the credit rating of the first Synchronization Status Message that Section Point sends sends less than or equal to the 3rd node, the 3rd port on it is set to receive only the 3rd Synchronization Status Message from the 4th port on the 3rd node by first node, and other ports in all of the port be connected with the 3rd node except the 3rd port send the second Synchronization Status Message to the 3rd node, wherein, the credit rating of the second Synchronization Status Message is different from the 3rd Synchronization Status Message; And first node is set to for the first port connecting Section Point the 3rd Synchronization Status Message only sending the 4th port on the 3rd node to the second port of Section Point by it, and other ports in all of the port be connected with Section Point except the first port send the second Synchronization Status Message to Section Point.In the preferred embodiment, there are three nodes in a transmission path, then three nodes link is between any two selected respectively, select link optimum between every two nodes, and between the link of all optimums, select the link of a road the best, the link of the optimum outside the link of the best sends Synchronization Status Message, on the basis preventing link Cheng Huan, saves link circuit resource.
Preferably, the credit rating of the first Synchronization Status Message and the credit rating of the 3rd Synchronization Status Message are compared in the Warning Mark position of the instruction credit rating that the Warning Mark position of instruction credit rating that first node carries according to the first Synchronization Status Message that Section Point sends is carried with the 3rd Synchronization Status Message that the 3rd node sends.In the preferred embodiment, adopt the credit rating carrying out judging Synchronization Status Message to the Warning Mark position of the instruction credit rating that Synchronization Status Message carries, saved and compared flow process, decreased workload.
In the present embodiment, the process of transmitting that above-mentioned first transmitting element and the second transmitting element carry out according to the comparative result of comparing unit, a just example, form that the present invention is not limited thereto, such as: the credit rating of credit rating less than or equal to the 3rd Synchronization Status Message comparing the first Synchronization Status Message, first node only receives by the port (such as port one 1) that it is connected with Section Point the first Synchronization Status Message sent from Section Point, and the second Synchronization Status Message is sent to Section Point on other ports be connected with Section Point (such as port one 2-1n), simultaneously, first node only sends the first Synchronization Status Message from Section Point by a port (such as port 41) that it is connected with the 3rd node to the 3rd node, and the second Synchronization Status Message is sent to the 3rd node on other ports (such as port 42-4n) be connected with the 3rd node, when the credit rating of the credit rating comparing the first Synchronization Status Message higher than the 3rd Synchronization Status Message, contrary with above-mentioned process of transmitting.
The transmission method of the Synchronization Status Message of this preferred embodiment is also not limited to the transmission between three nodes, and the transmission of the Synchronization Status Message between the node that can also comprise more than three, this transmission method is consistent with above-mentioned.Such as, first node also connects the 4th node, so, a road optimum link is selected respectively from the link between first node and Section Point, the link between first node and the 3rd node and the link between first node and the 4th node, a road best link is selected in the optimum link of Zai Congmei road, first node receives by this best link the Synchronication status message that node corresponding to this link send, and by node that this Synchronication status message sends to other optimum link corresponding by other optimum link.Other links except optimum link of first node force transmission second Synchronization Status Message respectively, and namely credit rating is the state information on year-on-year basis of F.
Certainly, " first ", " second " and " the 3rd " in this preferred embodiment is only used for distinguishing different main bodys, and is not used in this main body of restriction.
The transmission technology of the Synchronization Status Message during the Ethernet of above-described embodiment 1 and embodiment 2 is synchronous can on this basis of standard SSM agreement, by the grouping to SSM message, the election of grouping and force the port outside optimum source to send credit rating to realize the Cheng Huan that link packet prevents synchronous ethernet.
Concerning with first node and Section Point, first node receives SSM protocol massages, judge source MAC (the Medium Access Control of above-mentioned message, medium access control), if source MAC is identical, then can think that above-mentioned message comes from same node, such as: the message that the port of the Section Point that the port of first node receives sends just can assert that the port of Section Point is same source port.And in the port of first node, select clock source that port is corresponding as first node and the optimum clock source in the link packet of Section Point, the clock source that selection port is corresponding from the port of first node as first node relative to the optimum clock source in the link packet of the 3rd node.
An optimal clock source, road is selected from the optimum clock source in the link packet of the optimum clock source the link packet of first node and Section Point and first node and the 3rd node, such as, optimum clock source in the link packet of selection first node and Section Point is as optimal clock source, the port that then this optimal clock source is corresponding receives the first Synchronization Status Message of Section Point transmission according to standard SSM agreement, the port that first node is corresponding relative to the optimum clock source in the link packet of the 3rd node sends the first Synchronication status message to the 3rd node, thus complete the process the first Synchronization Status Message being sent to the 3rd node from Section Point, other ports in the link packet of first node and Section Point are forced to send the message that credit rating is F, other ports in the link packet of first node and the 3rd node are forced to send the message that credit rating is F, credit rating is the message i.e. credit rating of the second Synchronization Status Message of F, wherein, this credit rating is that the message of F is used to indicate: receiving after this credit rating is the message of F, by clock setting corresponding for this port for not enter line-locked operation, namely, do not receive the first Synchronication status message that Section Point sends or the operation not receiving the 3rd Synchronication status message that the 3rd node sends.
Adopt the synchronous ethernet of above-mentioned link packet, the reverse UNICOM causing Synchronization Status Message Cheng Huan can be avoided, standard SSM agreement is used normally in the network environment of multilink UNICOM.
Embodiment 3
Based on the network configuration of Fig. 3, Fig. 5 illustrate Ethernet synchronous in the another kind of flow chart of transmission method of Synchronization Status Message, wherein, DUT1 can be first node, and DUT2 can be Section Point.The transmission method of the Synchronization Status Message during Ethernet is as shown in Figure 5 synchronous comprises the steps:
S501:DUT1 sole mass grade is 2, and configured port 11 is to the multilink of port one n, and the corresponding clock source of port arrangement to every bar link, play automatic SSM algorithm, namely according to the running of standard SSM agreement, namely carry 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 the corresponding clock source of port arrangement to every bar link, play automatic SSM algorithm, namely carry out the transmission of Synchronization Status Message.
It is noted herein that, two DUT equipment are not only comprised in system, the multilink UNICOM of multiple devices can also be configured, namely not only can comprise first node and Section Point two equipment, multiple nodes such as the 3rd node can also be comprised, certainly, when comprising multiple node, the corresponding clock source of port arrangement of the link between also needing each node.
Below the transmission example of the Synchronization Status Message comprising three node systems is described:
The all of the port of S503:DUT1 receives the SSM message of opposite end, reference source MAC Address, and this opposite end comprises DUT2 and DUT3.Such as: all of the port (such as port one 1-1n and port 41-4n) of first node receives the SSM message that port (such as port 31-3n) that the port (such as port 21-2n) that is connected with the port of first node from Section Point and the 3rd node be connected with the port of first node sends, and compares the MAC Address of SSM message.
S504: divide into groups according to the source MAC of message.The port of homology divides at same group, the port namely coming from same node belongs to the port of homology, such as: the port (such as port 21-2n) of Section Point belongs to a grouping, the port (such as port 31-3n) of the 3rd node belongs to a grouping, multiple port can be had in a grouping, also can only have a port.
To be connected by two articles of links for first node and Section Point below and first node is connected by a link transmitting procedure being described Synchronization Status Message with the 3rd node, such as: first node is connected by two links with Section Point, the port one 1 of first node is connected with the port one 2 of Section Point, the port one 2 of first node is connected with the port 22 of Section Point, the port 41 of first node is connected with the port 31 of the 3rd node, and this transmitting procedure is also applicable to other connections certainly.
A grouping is had to the situation of multiple same source port, perform S505, one is only had with the situation of source port for a grouping, perform S506.
S505: for the grouping having multiple same source port, elects according to standard SSM agreement the optimum clock source that this grouping middle port is corresponding, such as: the clock source electing port one 1 correspondence of first node is optimum clock source.After executing S505, go to S507.
S506: for the grouping only having a port, this port is directly participated in the election of, such as: the clock source of port 41 correspondence of first node is directly as optimum clock source.After executing S506, go to S507
The clock source of all grouping elections is elected wherein best clock source according to standard SSM agreement by S507:DUT1 equipment, as the source that DUT1 will lock, such as: in the optimum clock source of the optimum clock source of port one 1 correspondence of first node and port 41 correspondence of first node, select an optimal clock source (such as port one 1), this optimal clock source as locking source, the Synchronization Status Message that the port (such as port 21) that the port (such as port one 1) that namely this optimal clock source is corresponding receives only the node be connected with this port sends.
Now, DUT1 have selected corresponding clock source (such as port one 1).Next the DUT1 process that (such as DUT3) transmits Synchronization Status Message is to downstream node described:
A grouping is had to the situation of multiple same source port, perform S508, for a grouping, there is a situation with source port, perform S509.
S508: for the grouping of the multiple same source port in S505, other ports not being elected as optimum clock source force transmission credit rating to be the Synchronization Status Message of F.Such as, the port one 2 of first node is forced to send the port 22 of Synchronization Status Message to Section Point that credit rating is F.The port (such as port one 1 and port 41) of 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 (such as port one 1) is corresponding is selected as the locking source of DUT1, this port (such as port one 1) then receives only the Synchronization Status Message that corresponding port (port 21 of such as Section Point) is sent: if the clock source of this port (such as port 41) correspondence is not chosen as locking source (namely the clock source of port 41 correspondence is only optimum clock source) by DUT1, this port (such as port 41) then sends Synchronization Status Message to downstream (such as the 3rd node), this Synchronization Status Message carries the credit rating that DUT1 locks source (such as the clock source of port one 1 correspondence).That is, after selecting optimum clock source, the clock source that such as port one 1 and port 41 are corresponding respectively is all selected as optimum clock source, the clock source of port one 1 correspondence of first node judges whether self is locking source (i.e. optimal clock source), if, then port one 1 receives only the Synchronization Status Message that Section Point port 21 sends, if not (port-for-port 41 that namely optimal clock source is corresponding), then the Synchronization Status Message that the port 31 that port one 1 sends the 3rd node received from port 41 sends is to the port 21 of Section Point.After executing S508, go to S510.
S509: the port that only has in S506 is divided into groups, according to standard SSM agreement, judge whether the clock source of this port (such as port 41) is chosen as the locking source of DUT1, if be selected as the locking source of DUT1, then this port (such as port 41) only carries out receiving the Synchronization Status Message sent corresponding port (such as port 31); If do not chosen as locking source by DUT1, then to downstream node (such as Section Point) sends Synchronization Status Message, and this Synchronization Status Message carries the credit rating that DUT1 locks source (i.e. the clock source of port 41 correspondence).That is, the clock source of port 41 correspondence of first node judges whether self is locking source, i.e. optimal clock source, if the Synchronication status message that the port 31 then receiving only the 3rd node sends, if not the Synchronization Status Message that the port 21 of Section Point that then transmit port 11 receives sends is to 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 elects port one 1 to be equipment clock source, and namely lock source, so port one 1 just receives only the Synchronization Status Message that port 21 transmits, and it is the Synchronization Status Message of F that port one 2 outwards can send credit rating.The port 22 of DUT2 receives this message, because grade is F, therefore, this port 22 can not as participation in the election source, so DUT2 self-vibration.That is, other ports (such as 21-2n) of DUT2 can not judge the Synchronization Status Message self received, and the clock source selecting port corresponding is as locking source, therefore prevent first node and Section Point to be formed by connecting ring due to multilink.For the processing procedure that DUT3 is also same.
S511:DUT1 and DUT2 all reaches stable, can expand to the method for the Synchronization Status Message transmission between multiple devices thus, thus it is synchronous to realize the whole network.
From above description, can find out, present invention achieves following technique effect: adopt and divided into groups by the multilink of switching equipment, and from every group, select a link to carry out the transmission of Synchronization Status Message, the problem solved, and then reach and prevent multilink UNICOM Cheng Huan, thus make the effect that Synchronization Status Message transmits to downstream smoothly.
Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, they can be stored and be performed by calculation element in the storage device, and in some cases, step shown or described by can performing with the order be different from herein, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. Ethernet synchronous in the transmission method of Synchronization Status Message, it is characterized in that, comprising:
The every bar link of first node between described first node and Section Point receives the first Synchronization Status Message from described Section Point, wherein, the credit rating of described first Synchronization Status Message is the credit rating that described Section Point synchronous regime attribute kit contains;
If described first node only connects described Section Point, then the first port on it is set to receive only described first Synchronization Status Message from the second port on described Section Point by described first node, and other ports in all of the port be connected with described Section Point except described first port send the second Synchronization Status Message to described Section Point, wherein, the credit rating of described second Synchronization Status Message is different from described first Synchronization Status Message, there is 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 3rd node send;
If the credit rating of the 3rd Synchronization Status Message that the credit rating of described first Synchronization Status Message that described Section Point sends sends higher than described 3rd node, then described first port on it is set to receive only described first Synchronization Status Message from described second port on described Section Point by described first node, and other ports in all of the port be connected with described Section Point except described first port send described second Synchronization Status Message to described Section Point, wherein, the credit rating of described second Synchronization Status Message is different from described first Synchronization Status Message, and described first node is set to for the 3rd port connecting described 3rd node the first Synchronization Status Message only sending the second port on described Section Point to the 4th port of described 3rd node by it, and other ports in all of the port be connected with described 3rd node except described 3rd port send described second Synchronization Status Message to described 3rd node.
4. method according to claim 3, is characterized in that, if the credit rating of described first Synchronization Status Message of described Section Point transmission is less than or equal to the credit rating of the 3rd Synchronization Status Message of described 3rd node transmission, described method also comprises:
Described 3rd port on it is set to receive only described 3rd Synchronization Status Message from described 4th port on described 3rd node by described first node, and other ports in all of the port be connected with described 3rd node except described 3rd port send described second Synchronization Status Message to described 3rd node, wherein, the credit rating of described second Synchronization Status Message is different from described 3rd Synchronization Status Message; And described first node is set to for described first port connecting described Section Point described 3rd Synchronization Status Message only sending described 4th port on described 3rd node to described second port of described Section Point by it, and other ports in all of the port be connected with described Section Point except described first port send described second Synchronization Status Message to described Section Point.
5. method according to claim 3, it is characterized in that, the Warning Mark position of the instruction credit rating that the 3rd Synchronization Status Message that Warning Mark position and described 3rd node of the instruction credit rating that described first Synchronization Status Message that described first node sends according to described Section Point carries send carries is to the credit rating of the credit rating of more described first Synchronization Status Message and described 3rd Synchronization Status Message.
6. Ethernet synchronous in the transmission system of Synchronization Status Message, it is characterized in that, comprising: first node and Section Point, wherein:
Described Section Point sends the first Synchronization Status Message to described first node on every bar first link between described first node and described Section Point, wherein, the credit rating of described first Synchronization Status Message is the credit rating that described Section Point synchronous regime attribute kit contains;
Described first node is used for when described first node only connects described Section Point, the first port on it is set to receive only described first Synchronization Status Message from the second port on described Section Point, and other ports in all of the port be connected with described Section Point except described first port send the second Synchronization Status Message to described Section Point, wherein, the credit rating of described second Synchronization Status Message is different from described first Synchronization Status Message, there is 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 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 connecting described first node, the 3rd Synchronization Status Message is sent on every article of second link between described first node and described 3rd node, wherein, the credit rating of described 3rd Synchronization Status Message is the credit rating of described 3rd node;
Wherein, described first node comprises: the comparing unit connected successively and the first transmitting element, wherein,
The credit rating of described 3rd Synchronization Status Message that the credit rating of described first Synchronization Status Message that described comparing unit sends for more described Section Point and described 3rd node send;
Described first transmitting element is used for when credit rating higher than described 3rd Synchronization Status Message of the credit rating of described first 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 other ports in all of the port be connected with described Section Point except described first port send described second Synchronization Status Message to described Section Point, wherein, the credit rating of described second Synchronization Status Message is different from described first Synchronization Status Message, and will be set to for the 3rd port connecting described 3rd node described first Synchronization Status Message only sending the second port on described Section Point to the 4th port of described 3rd node in described first node, and other ports in all of the port be connected with described 3rd node except described 3rd port send described second Synchronization Status Message to described 3rd node.
9. system according to claim 8, is characterized in that, described first node also comprises:
Connect the second transmitting element of comparing unit, for when credit rating less than or equal to described 3rd Synchronization Status Message of the credit rating of described first Synchronization Status Message, described 3rd port of described first node is set to receive only described 3rd Synchronization Status Message from described 4th port on described 3rd node, and other ports in all of the port be connected with described 3rd node except described 3rd port send described second Synchronization Status Message to described 3rd node, wherein, the credit rating of described second Synchronization Status Message is different from described 3rd Synchronization Status Message, and will be set to for described first port connecting described Section Point described 3rd Synchronization Status Message only sending described 4th port on described 3rd node to described second port of described Section Point in described first node, and other ports in all of the port be connected with described Section Point except described first port send described second Synchronization Status Message to described Section Point.
10. system according to claim 8, it is characterized in that, the Warning Mark position of the instruction credit rating that the Warning Mark position of the instruction credit rating that described comparing unit also carries for described first Synchronization Status Message sent according to described Section Point is carried with the 3rd Synchronization Status Message that described 3rd node sends is to the credit rating of the credit rating of more described first Synchronization Status Message and described 3rd Synchronization Status Message.
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| 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 |
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| 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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| 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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