WO2016184129A1 - Procédé, dispositif et appareil de réseau pour réaliser une synchronisation de temps basée sur une monodiffusion - Google Patents

Procédé, dispositif et appareil de réseau pour réaliser une synchronisation de temps basée sur une monodiffusion Download PDF

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Publication number
WO2016184129A1
WO2016184129A1 PCT/CN2016/070075 CN2016070075W WO2016184129A1 WO 2016184129 A1 WO2016184129 A1 WO 2016184129A1 CN 2016070075 W CN2016070075 W CN 2016070075W WO 2016184129 A1 WO2016184129 A1 WO 2016184129A1
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Prior art keywords
time synchronization
network device
unicast
network
role
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PCT/CN2016/070075
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English (en)
Chinese (zh)
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赵洪广
瞿艳霞
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中兴通讯股份有限公司
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements

Definitions

  • the present invention relates to the field of time synchronization technologies in a network, and in particular, to a unicast-based time synchronization implementation method, apparatus, and network device.
  • time synchronization protocols have received more and more attention and extensive applications in communication networks.
  • PTP Precision Time Protocol
  • time synchronization protocols Most of them exist in the ring network and require time synchronization path backup.
  • the encapsulation format is multicast by default, but multicast has flooding and security control problems.
  • the unicast negotiation mechanism is clearly defined in the IEEE1588v2 standard. It stipulates that any available port can send unicast requests. Any port can answer unicast requests. However, the time synchronization networking topology under unicast is not described. The time synchronization networking topology under multicast is clearly designed, and the BMCA algorithm is defined to control the networking topology.
  • the IEEE1588v2 unicast negotiation mechanism is adopted to specify the behavior of unicast negotiation and the corresponding topology algorithm, so that unicast can be applied in the packet frequency recovery network, but G.
  • the network model defined by the 8265.1 standard is very limited. The model defined by it does not apply to the ring network time synchronization network. How to use unicast to complete time network deployment in the ring network is a problem that needs to be solved.
  • the embodiment of the invention provides a unicast-based time synchronization implementation method, device and network device, which implements a time synchronization networking topology at least in a unicast network.
  • the technical solution adopted by the embodiment of the present invention is the unicast-based time synchronization implementation method, and the process performed by any network device in the network includes:
  • Unicast time synchronization negotiation to neighbor network devices including:
  • A1 The any network device periodically sends a time synchronization request to the neighbor network device, and responds according to the time synchronization request of the other party;
  • step A2 If the other party agrees and replies to the time synchronization information, the negotiation is successful, and step A1 is repeated; otherwise, the negotiation fails. Repeat step A1.
  • the performing the port state selection includes: when the first precision time synchronization protocol PTP port of the any network device is connected to the second PTP port of a neighbor network device, based on the BMC (Best Master Clock, the best) The primary clock) determines the role of the first PTP port and the second PTP port; between any two adjacent network devices, the role of the port represents the role of the network device;
  • the time synchronization with the neighbor network device includes:
  • the time synchronization information is replied based on the received time synchronization request
  • synchronization is performed based on the received time synchronization information.
  • the any network device periodically sends a time synchronization request to the neighbor network device, including:
  • the neighboring network device is periodically requested to send the announce message, the sync message, and the delay response message to the neighboring network device.
  • the neighboring network device When the role of any network device is master, passive, pre-master, or listening, the neighboring network device is periodically requested to send the announce message to the neighboring network device in the set sending mode.
  • the content of the set transmission mode includes: a keep-alive period and a transmission frequency of each type of message.
  • the responding based on the time synchronization request of the other party includes:
  • the method further includes:
  • the set frequency is at least greater than the frequency corresponding to the keep-alive period.
  • the networking form of the network includes: a ring network or a chain network.
  • the set frequency is greater than the sending frequency of the announce message during the time synchronization process.
  • the present invention further provides a unicast-based time synchronization implementation device, which is disposed in any network device in a network, where the device includes: a negotiation module and a synchronization module, respectively, for each neighbor network device of the any network device Perform the following functions:
  • the negotiation module is configured to perform unicast time synchronization negotiation to the neighbor network device.
  • the synchronization module is configured to perform port state selection during negotiation, and when performing with a neighbor network device Synchronized.
  • the negotiation module includes:
  • the processing module is configured to periodically send a time synchronization request to the neighbor network device, and respond according to the time synchronization request of the other party; if the other party agrees and replies to the time synchronization information, the negotiation succeeds; otherwise, the negotiation succeeds; failure;
  • the callback module is set to recall the processing module when the negotiation is successful and the negotiation fails.
  • the synchronization module is set to:
  • the role of the PTP port; between any two adjacent network devices, the role of the port represents the role of the network device;
  • the time synchronization information is replied based on the received time synchronization request of the neighbor network device;
  • synchronization is performed based on the time synchronization information of the received neighbor network device.
  • the present invention also provides a network device, including the above-described unicast-based time synchronization implementation apparatus.
  • the embodiment of the present invention has at least the following advantages:
  • the unicast-based time synchronization implementation method, device, and network device according to the embodiment of the present invention are compared with related technologies.
  • the embodiment of the present invention proposes a unicast mode and requests a unicast request. Interval to control the interworking speed of packets.
  • the unicast encapsulation is connected to the mature multicast topology calculation model, which solves the problem of unicast deployment in the ring network. This solution can not only complete the unicast ring network requirements, but also It also supports the network topology requirements of a single multicast hybrid application.
  • FIG. 1 is a flowchart of a method for implementing time synchronization based on unicast according to a first embodiment of the present invention
  • FIG. 2 is a flowchart of a method for implementing time synchronization based on unicast according to a second embodiment of the present invention
  • FIG. 3 is a schematic structural diagram of a unicast-based time synchronization implementation apparatus according to a third embodiment of the present invention.
  • FIG. 4 is a schematic diagram of a unicast topology of a ring network according to a sixth embodiment of the present invention.
  • FIG. 5 is a schematic diagram of topology switching in a ring network unicast when a fault occurs in the sixth embodiment of the present invention.
  • a first embodiment of the present invention is a unicast-based time synchronization implementation method. As shown in FIG. 1 , a process performed by any network device in a network includes:
  • Step S101 Perform unicast time synchronization negotiation to the neighbor network device.
  • step S101 includes:
  • A1 The any network device periodically sends a time synchronization request to the neighbor network device, and responds according to the time synchronization request of the other party;
  • step A2 If the other party agrees and replies to the time synchronization information, the negotiation is successful, and step A1 is repeated; otherwise, the negotiation fails, and step A1 is repeatedly executed.
  • the time synchronization information is specifically an announce message, a sync message, a delay response message, and the like. Time information carried. In practical applications, initially all network devices in the network are in the state of listening for the listening role.
  • the role of the network device is changed to master, so the roles of almost all network devices become The master, at this time, the any network device and the neighbor network device perform each other in the role of the master: sending a time synchronization request and replying the time synchronization information based on the time synchronization request of the other party, if the other party replies with the role of the master If the time synchronization information is used, the negotiation is successful; otherwise, the negotiation fails.
  • the existing unicast negotiation mechanism stipulates that any available port can send a unicast time synchronization request, and any available port can answer the unicast request.
  • the embodiment of the present invention is directed to the current situation that the unicast negotiation mechanism is not clearly defined. The embodiment stipulates that the ports between adjacent network devices can actively initiate time synchronization negotiation in the role of the master, and the port acting as the master must respond to the request of the other party, thereby determining the role represented by each port.
  • the A1 step is based on the other party's time synchronization request, when the role of any network device is master, the other party requests and answers; when the role of any network device is non-master, discard or reject Corresponding to the request.
  • Step S102 in the process of negotiation, performing port state selection and performing time synchronization with the neighbor network device.
  • the performing port state selection includes: determining, according to the BMC algorithm, that the first PTP port of the any network device is connected to the second PTP port of a neighbor network device
  • the role of the first PTP port and the second PTP port include: master, passive, pre-master, listening, slave, and uncalibrated. Among them, slave, master, and passive are steady-state roles, while pre-master, listening, and uncalibrated are transient roles. In order to make the following description more concise, between the roles of any two adjacent network devices, the role of the network device represents the role of the network device.
  • the time synchronization with the neighbor network device includes:
  • the time synchronization information is replied based on the received time synchronization request, so that the neighbor network device is synchronized according to the time synchronization information when the neighbor network device is in the slave role;
  • the received time synchronization information is synchronized.
  • the embodiment of the present invention specifies that any port of any network device needs to periodically send a time synchronization request to the corresponding neighbor network device, requesting to obtain time synchronization information. .
  • the port of the master role is obliged to reply to the time synchronization information based on the request of the neighbor network device.
  • This helps the multicast BMC algorithm to implement the planning topology in unicast mode, which will be applied to the multicast PTP smoothly.
  • the BMC algorithm is applied to unicast. Because the multicast does not have a request mechanism, each port actively sends time synchronization information according to the role of the master.
  • packet unicast encapsulation in addition to packet unicast encapsulation, other behaviors and The multicast situation is basically the same.
  • any network device periodically sends a time synchronization request to the neighbor network device, including:
  • the neighboring network device is periodically requested to send the announce message, the sync message, and the delay response message to the neighboring network device.
  • the neighboring network device When the role of any network device is master, passive, pre-master, or listening, the neighboring network device is periodically requested to send the announce message to the neighboring network device in the set sending mode.
  • the set transmission mode includes: a keep-alive period and a transmission frequency of each type of message. For example, it is set to send a message every 5 seconds within half an hour, wherein the keep-alive period is half an hour, and every 5 seconds is the transmission frequency of the message.
  • the networking form of the network includes: a ring network or a chain network.
  • the second embodiment of the present invention is a unicast-based time synchronization implementation method.
  • the method in this embodiment is substantially the same as the first embodiment. The difference is that, as shown in FIG. 2, the method in this embodiment includes In addition to the steps S201-202 corresponding to the steps S101-S102 of the first embodiment, the flow performed by any of the network devices further includes the following specific steps:
  • step S203 if the negotiation fails, the unicast time synchronization negotiation is re-requested to the neighbor network device at the set frequency; the set frequency is at least greater than the frequency corresponding to the keep-alive period.
  • the keep-alive period is a periodic period of time that the user presets the requesting neighbor network device to reply to the time synchronization information.
  • the set frequency is greater than the sending frequency of the announce message in the time synchronization process.
  • the third embodiment of the present invention corresponding to the first embodiment, the present embodiment introduces a unicast-based time synchronization implementation device, which is disposed in any network device in the network.
  • the device includes The following components: the negotiation module 100 and the synchronization module 200 perform the following functions for each neighbor network device of any one of the network devices:
  • the negotiation module 100 is configured to perform unicast time synchronization negotiation to the neighbor network device.
  • the negotiation module 100 includes:
  • the processing module is configured to periodically send a time synchronization request to the neighbor network device, and respond according to the time synchronization request of the other party; if the other party agrees and replies to the time synchronization information, the negotiation succeeds; otherwise, the negotiation succeeds; failure;
  • the callback module is set to recall the processing module when the negotiation is successful and the negotiation fails.
  • the role of the network device is changed to master, so the roles of almost all network devices become The master, at this time, the any network device is executed by the negotiation module 100 and the neighbor network device to each other in the role of the master: sending a time synchronization request and replying the time synchronization information based on the time synchronization request of the other party, if the other party is master The role replies to the time synchronization information, then the negotiation is successful; otherwise the negotiation fails.
  • the performing the port state selection includes: when the first PTP port of the any network device is connected to the second PTP port of a neighbor network device, based on the BMC (Best Master Clock)
  • the clock determines the roles of the first PTP port and the second PTP port; the types of roles include: master, passive, pre-master, listening, slave, and uncalibrated.
  • the role of the network device represents the role of the network device.
  • the synchronization module 200 is configured to perform port state selection during the negotiation process and perform time synchronization with the neighbor network device.
  • the synchronization module 200 is configured to:
  • the time synchronization information is replied based on the received time synchronization request of the neighbor network device, so that the neighbor network device is synchronized according to the time synchronization information when the neighbor network device is in the slave role.
  • the time synchronization information of the received neighbor network device is synchronized.
  • synchronization module 200 is configured to:
  • the neighboring network device is periodically requested to send the announce message, the sync message, and the delay response message to the neighboring network device.
  • the neighboring network device When the role of any network device is master, passive, pre-master, or listening, the neighboring network device is periodically requested to send the announce message to the neighboring network device in the set sending mode.
  • the set transmission mode includes: a keep-alive period and a transmission frequency of each type of message.
  • the networking form of the network includes: a ring network or a chain network.
  • the fourth embodiment of the present invention introduces a unicast-based time synchronization implementation device.
  • the device in this embodiment is substantially the same as the third embodiment, and the difference is that the negotiation module in this embodiment 100 also needs to complete the following functions when the negotiation fails:
  • the negotiation module 100 is further configured to request the unicast time synchronization negotiation to the neighbor network device at the set frequency in the case that the negotiation fails.
  • the set frequency is at least greater than the frequency corresponding to the keep alive period of the announce message.
  • the set frequency is greater than the sending frequency of the announce message in the time synchronization process.
  • any network device requests the unicast time synchronization negotiation to the neighbor network device through the negotiation module 100 at a higher frequency, in order to complete the topology response, so that the design can be performed in the BMC algorithm.
  • the announce packet is sent out quickly according to the request to prevent network turbulence caused by slow response.
  • the required request frequency is higher, and the sending frequency of the announce message is set, so that a better quick response effect can be achieved.
  • a fifth embodiment of the present invention includes the unicast-based time synchronization implementation device described in the foregoing third embodiment or the fourth embodiment.
  • the sixth embodiment of the present invention is based on the above embodiment, and uses an unicast ring network as an example to describe an application example of the present invention with reference to FIGS. 4-5.
  • ports of various roles of any network device in the ring network need to periodically request unicast request packets (similar to the time synchronization request in the previous embodiment) to request time synchronization negotiation.
  • port role selection and time synchronization In the process of negotiation, port role selection and time synchronization.
  • the master port of the PTP needs to receive and respond to the unicast request message, and needs to send the time synchronization information of the negotiated announce and sync messages.
  • the other port roles reject or not respond to the unicast request of the neighbor network device. Message.
  • any network device and its neighbor network devices perform the following operations:
  • the performing the port role selection includes: when the first PTP port of the any network device is connected to the second PTP port of a neighbor network device, the first PTP port and the first determined by the BMC algorithm
  • the role of the two PTP ports; the types of roles include: master, passive, pre-master, listening, slave, and uncalibrated.
  • the role of the port represents the role of the network device.
  • the following unicast negotiation interval control mode is adopted between any network device and its neighbor network devices:
  • the time synchronization information is periodically requested to the neighbor network device according to the keep-alive period configured by the user.
  • the time synchronization information of the request to the neighbor network device periodically needs to be maintained at a higher frequency. It is the sending frequency of the announce message.
  • the rate of failed master negotiation can be reduced to 60s.
  • a high-frequency request needs to be maintained in the ring network to complete the rapid response of the topology.
  • the announce message is sent out quickly.
  • the external behavior is the same as that of the multicast unicast encapsulation. This facilitates the multicast topology algorithm. Plan the topology to prevent network turbulence due to response speed.
  • the configuration destination address of the network device is configured first, so that each PTP port sends a unicast request packet.
  • the multicast topology algorithm (BMC algorithm) will time out the port as the master.
  • the port is successfully negotiated with each other and sends an announce packet.
  • the topology is generated according to the algorithm.
  • each port state sends a unicast request packet, but the roles are different.
  • the slave port is used to maintain the time from the master.
  • the passive port is used to keep the peer master port sending announce packets and keep the port in the passive state.
  • the request packet sent by the master port is rejected by the peer.
  • the packets sent by the master port are used to monitor the network topology. When the network sends changes, it can respond quickly.
  • the embodiment of the present invention needs to perform the following operations for each network device:
  • Step A Complete neighbor awareness by configuring an IP address of a neighboring port on each PTP port.
  • Step B Enable the ring network unicast mode
  • Step C The PTP port initiates a unicast time synchronization request packet to the configured IP address.
  • Step D The receiving end of the unicast time synchronization request message: if the master port accepts and responds to the request, the other role ports reject or do not respond to the request.
  • Step E After the master port successfully negotiates the issue of the announce packet, you can refer to the multicast mode to complete the topology calculation.
  • the E device cannot receive the F time, and the time information is degraded.
  • the D device changes the passive port to the master port.
  • the device E changes the time of tracking D, thereby completing the topology switching.
  • the unicast-based time synchronization implementation method, device, and network device compared with the prior art, the present invention proposes a unicast mode and limits the unicast request interval according to the actual requirements of the network deployment. To control the interworking speed of packets, and finally connect the unicast encapsulation to the mature multicast topology calculation model, which solves the problem of unicast deployment in the ring network.
  • This solution can not only complete the unicast ring network requirements, but also simultaneously Support network topology requirements for single multicast hybrid applications.
  • a unicast-based time synchronization implementation method, apparatus, and network device provided by the embodiments of the present invention have the following beneficial effects: according to the actual requirements of network deployment, a unicast mode is proposed, and a unicast request is obtained through constraints. The interval is used to control the interworking speed of packets. Finally, the unicast encapsulation is connected to the mature multicast topology calculation model, which solves the problem of unicast deployment in the ring network. This solution can not only complete the unicast ring network requirements. It also supports the network topology requirements of a single multicast hybrid application.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

L'invention concerne un procédé, un dispositif et un appareil de réseau pour réaliser une synchronisation de temps basée sur une monodiffusion. Un processus exécuté par un appareil de réseau quelconque dans un réseau consiste à réaliser de manière respective les mises en œuvres suivantes sur chacun des appareils de réseau voisins de l'appareil de réseau : négocier avec les appareils de réseau voisins pour une synchronisation de temps de monodiffusion ; et sélectionner un état de port, et effectuer une synchronisation avec les appareils de réseau voisins. Par comparaison avec l'état de la technique associé, la présente invention fournit un mode de monodiffusion selon une exigence pratique de déploiement de réseau, commande la vitesse d'intercommunication de paquets en limitant un intervalle demandé par la monodiffusion, et intègre enfin une encapsulation de monodiffusion dans un modèle de calcul de topologie de multidiffusion mûr, permettant ainsi de traiter de manière efficace le problème concernant le déploiement de monodiffusion dans un réseau en boucle. La solution non seulement satisfait une exigence d'un réseau en boucle de monodiffusion mais satisfait également une exigence de topologie de réseau pour une application de monodiffusion-multidiffusion hybride.
PCT/CN2016/070075 2015-05-21 2016-01-04 Procédé, dispositif et appareil de réseau pour réaliser une synchronisation de temps basée sur une monodiffusion WO2016184129A1 (fr)

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