WO2012174892A1

WO2012174892A1 - Method, system and device for keeping clock synchronization of ntp servers

Info

Publication number: WO2012174892A1
Application number: PCT/CN2012/072259
Authority: WO
Inventors: 刘佳宁
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-06-20
Filing date: 2012-03-13
Publication date: 2012-12-27
Also published as: CN102231656A; CN102231656B

Abstract

Disclosed are a method, system and device for keeping clock synchronization of NTP servers. A first NTP-I server and a second NTP-I server synchronize clocks from a telecommunication NTP-T server; the first NTP-I server inquires a first clock offset value between itself and the second NTP-I server according to a set time interval; the first NTP-I server inquires a second clock offset value between itself and the NTP-T server when the first clock offset value exceeds a set time difference threshold; and a local clock is corrected when the second clock offset value exceeds the set time difference threshold. The Method, system and device of the present invention can very well keep clock synchronization of NTP servers and avoid clock disorder of the system.

Description

NTP server clock synchronization maintaining method, system and device

The invention relates to the field of network television technology, in particular to a NTP (Network Time Protocol) server clock synchronization holding method, system and device. Background technique

Many business processes of Interactive Personality TV (IPTV) rely on clocks, such as time-shifted services, back-view services, and subscription services. With the rapid development of IPTV, the pressure on NTP servers is increasing. Big, the responsibility is getting bigger and bigger. The NTP server needs to provide NTP clock synchronization for each IPTV server, and also provides NTP clock synchronization for the Set Top Box (STB). Since the time after the STB is powered on defaults to 1970, the NTP server is configured to not limit the time difference and still provide the NTP clock synchronization service.

The NTP server of the IPTV (hereinafter referred to as the NTP-I server) is configured to synchronize the clock from the telecom NTP server (hereinafter referred to as the NTP-T server). The NTP-T server is configured to provide the NTP synchronization service if the time difference exceeds 4S. For the specific networking architecture, see Figure 1. The NTP-T server provides the synchronous clock. The NTP-I server synchronizes the clock signal from the NTP-T server to implement clock synchronization. The NTP synchronization (SYNC) signal is used to synchronize the service servers and set-top boxes. Clock.

If the NTP-I server has a clock transition of more than 4S, the NTP-I server will fail to perform clock synchronization from the NTP-T server due to the NTP-T server configuration. The NTP-I server's error clock will be provided through it. The NTP service is synchronized to all IPTV service servers and STBs, causing the service server and the STB clock to be disordered, resulting in abnormal service services. Summary of the invention

The embodiment of the invention provides a method, a system and a device for maintaining a clock synchronization of an NTP server, which are used to solve the problem that the system clock is disordered and the service service is abnormal when the clock synchronization of the existing NTP server fails.

In order to solve the above problems, the technical solution of the present invention is implemented as follows:

A network time protocol NTP server clock synchronization maintenance method, including:

The first NTP-I server and the second NTP-I server synchronize the clock from the telecommunication NTP-T server; the first NTP-I server queries the first clock offset value of the second NTP-I server according to the set time interval. When the first clock deviation value exceeds the set time difference threshold, the first NTP-I server queries the second clock deviation value of itself and the NTP-T server, and if the second clock deviation value exceeds the set time difference threshold, the local modification is corrected. Clock; and,

The second NTP-I server queries the third clock deviation value of the first NTP-I server according to the set time interval. When the third clock deviation value exceeds the set time difference threshold, the second NTP-I server queries itself. The fourth clock deviation value from the NTP-T server, if the fourth clock deviation value exceeds the set time difference threshold, the local clock is corrected.

The first NTP-I server queries the first clock offset value between itself and the second NTP-I server according to the set time interval, including:

The first NTP-I server sends a first clock deviation query request to the second NTP-I server according to the set query time interval, and receives the second NTP-I server returns itself after receiving the first clock deviation query request. The first clock offset value from the first NTP-I server.

The second NTP-I server queries the third clock offset value of the first NTP-I server according to the set time interval, including:

The second NTP-I server sends a third clock deviation query request to the first NTP-I server according to the set query time interval, and receives the first NTP-I server returns itself after receiving the third clock deviation query request. The third clock deviation value from the second NTP-I server. The first NTP-I server queries the second clock offset value of the NTP-T server and the NTP-T server. If the second clock offset exceeds the set time difference threshold, the local clock is corrected, including:

The first NTP-I server sends a second clock deviation query request to the NTP-T server; and receives a second clock offset value between the NTP-T server and the first NTP-I server after receiving the second clock deviation query request. And its own standard clock;

When the first NTP-I server determines that the second clock offset value exceeds the set time difference threshold, the local clock is corrected according to the received standard clock.

The second NTP-I server queries the fourth clock offset value between itself and the NTP-T server. If the fourth clock offset value exceeds the set time difference threshold, the local clock is corrected, including:

The clock synchronization service is provided for the service server by using the first NTP-I server and/or the second NTP-I server, and the clock synchronization service is provided for the set top box by using the first NTP-I server or the second NTP-I server.

An NTP server clock synchronization maintenance system includes:

a first NTP-I server, configured to synchronize a clock from the telecommunication NTP-T server; query the first clock deviation value of the second NTP-I server according to the set time interval, when the first clock deviation value exceeds the set value When the time difference threshold is used, the first NTP-I server queries the second clock deviation value of itself and the NTP-T server, and if the second clock deviation value exceeds the set time difference threshold, the local clock is corrected;

a second NTP-I server, configured to synchronize a clock from the telecommunication NTP-T server; query a third clock deviation value of the first NTP-I server according to the set time interval, when the third clock is biased When the difference exceeds the set time difference threshold, the second NTP-I server queries the fourth clock deviation value of itself and the NTP-T server, and if the fourth clock deviation value exceeds the set time difference threshold, the local clock is corrected.

The first NTP-I server is further configured to provide a clock synchronization service for the service server and the set top box; and the second NTP-I server is further configured to provide a clock synchronization service for the service server and a clock synchronization service for the set top box.

An NTP server, including:

a clock synchronization module, configured to synchronize a clock from a telecommunications NTP-T server;

a first query module, configured to query a first clock offset value of the second NTP-I server according to the set time interval;

The second query module is configured to: when the first clock deviation value exceeds the set time difference threshold, query the second clock deviation value of the self and the NTP-T server, and if the second clock deviation value exceeds the set time difference threshold, the correction is performed. Local clock.

The first query module is configured to:

Sending a first clock deviation query request to the second NTP-I server according to the set query interval;

Receiving a first clock offset value of the first NTP-I server returned by the second NTP-I server after receiving the first clock deviation query request and the first NTP-I server.

The second query module is configured to:

Sending a second clock deviation query request to the NTP-T server when the first clock deviation value exceeds the set time difference threshold;

Receiving a second clock offset value of the NTP-T server and the first NTP-I server returned by the NTP-T server after receiving the second clock deviation query request and its own standard clock;

When it is determined that the second clock deviation value exceeds the set time difference threshold, the local clock is corrected according to the received standard clock. The beneficial effects of the present invention are as follows:

The NTP server clock synchronization holding method, system and device provided by the embodiment of the present invention, the first NTP-I server and the second NTP-I server mutually query each other's clock offset value, when the first NTP-I server or the first When the NTP-I server finds that the clock deviation between itself and the other party exceeds the set time difference threshold, it queries the clock offset value between itself and the NTP-T server. If the clock offset value between itself and the NTP-T server exceeds the set time difference threshold. , then correct the local clock. Therefore, the clock synchronization failure and the synchronization failure of the NTP-I server are avoided, which causes the service server and the STB clock to be disordered, ensuring that the NTP-I server is always synchronized, thereby ensuring that the clock of the system is correct and the system can operate normally. . DRAWINGS

1 is a network diagram of an IPTV system in the prior art;

2 is a schematic structural diagram of a clock synchronization and maintenance system of an NTP server according to an embodiment of the present invention; FIG. 3 is a flowchart of a method for maintaining a clock synchronization of an NTP server according to an embodiment of the present invention; and FIG. 4 is a schematic structural diagram of an NTP server according to an embodiment of the present invention. detailed description

An embodiment of the present invention provides a method for maintaining a clock synchronization of an NTP server, which is implemented by using an NTP server clock synchronization and maintenance system as shown in FIG. 2, where the system includes: a first NTP-I server, a second NTP-I server, and a telecommunications NTP- T server.

a first NTP-I server, configured to synchronize a clock from the telecommunication NTP-T server; query the first clock deviation value of the second NTP-I server according to the set time interval, when the first clock deviation value exceeds the set value When the time difference threshold is reached, the first NTP-I server queries the second clock deviation value of itself and the NTP-T server, and if the second clock deviation value exceeds the set time difference threshold, the local clock is corrected.

a second NTP-I server for synchronizing the clock from the telecommunications NTP-T server; The time interval queries the third clock deviation value of the first NTP-I server. When the third clock deviation value exceeds the set time difference threshold, the second NTP-I server queries the fourth clock deviation of the NTP-T server. Value, if the fourth clock deviation value exceeds the set time difference threshold, the local clock is corrected.

The above system also includes several business services and set top boxes. The first NTP-I server is further configured to provide a clock synchronization service for the service server and the set top box; and the second NTP-I server is further configured to provide a clock synchronization service for the service server and a clock synchronization service for the set top box.

Specifically, the first NTP-I server and/or the second NTP-I server provide clock synchronization services for the service server, and the clock synchronization service is provided for the set top box through the first NTP-I server or the second NTP-I server.

The method for maintaining the clock synchronization of the NTP server provided by the embodiment of the present invention is as shown in FIG. 3, and includes the following steps:

Step S11: The first NTP-I server and the second NTP-I server synchronize the clock from the telecommunication NTP-T server.

Referring to steps 0.1 and 0.2 shown in Fig. 1, the first NTP-I server and the second NTP-I server synchronize the clock from the NTP-T server, and send the NTP SYNC signal as shown in FIG.

Configure the NTP synchronization system service of the first NTP-I server and the second NTP-I server, and provide an NTP server with a standard clock as the NTP-T server of the telecommunications. The configuration file of the first NTP-I server and the second NTP-I server are identical. And start the NTP process to synchronize the clock from NTP-T.

In addition, the first NTP-I server and the second NTP-I server provide clock synchronization for the service server and the set top box, as shown in the figure, NTP SYNC.

Step S12: The first NTP-I server queries the first clock offset value of itself and the second NTP-I server according to the set time interval. The first NTP-I server sends a first clock deviation query request to the second NTP-I server according to the set query time interval, and receives the self and the first NTP-I server returning after receiving the first clock deviation query request. The first clock bias value of an NTP-I server.

Referring to FIG. 2, the first NTP-I server and the second NTP-I server are installed with a self-developed clock protection program (hereinafter referred to as NTP-PRO), and configure their own IP address and the IP address of the other party, and set a time difference threshold (referred to as LIMIT). ), for example, it can be 4S by default. Start the NTP-PRO process, which is a resident process, executed every 10 seconds, and 10 seconds is the set time interval.

Referring to steps 1.1 and 1.2 of FIG. 1, the first NTP-I server sends a clock deviation query request to the second NTP-I server and the second NTP-I server returns the clock offset value between itself and the first NTP-I server. Step S1.1 uses the "ntpdate -d {NTP-I-2}" command to perform the clock deviation query, and step S1.2 returns the first clock offset value (OFFSET-REMOTE).

Step S13: Determine whether the first clock deviation value exceeds a set time difference threshold. If yes, go to step S14; otherwise, go to step S22.

The first clock offset value (OFFSET-REMOTE) is compared to the time difference threshold (LIMIT). When the first clock offset value (OFFSET-REMOTE) exceeds the time difference threshold (LIMIT), a subsequent query operation is performed, otherwise the clock is considered normal and no operation is performed.

Step S14: The first NTP-I server queries the second clock offset of the NTP-T server.

When the first clock offset value exceeds the set time difference threshold, the first NTP-I server queries the second clock offset value of itself and the NTP-T server.

The first NTP-I server sends a second clock deviation query request to the NTP-T server; and receives a second clock offset value between the NTP-T server and the first NTP-I server after receiving the second clock deviation query request. And its own standard clock; when the first NTP-I server determines that the second clock deviation value exceeds the set time difference threshold, the local clock is corrected according to the received standard clock.

See steps 1.3 and 1.4 of Figure 1 for the first NTP-I server to serve NTP-T. The device sends a clock deviation query request and the NTP-T server returns its own clock offset value from the first NTP-I server. Step S1.3 uses the "ntpdate -d {NTP-T}" command to perform clock deviation query. Step S1.4 returns the second clock offset value (OFFSET-SERVER) and the NTP-T server's own standard clock (referred to as SERVER for short). -TIME ) , which is the current time of the NTP-T server.

Step S15: Determine whether the second clock deviation value exceeds the set time difference threshold.

Compares whether the second clock deviation value (OFFSET-SERVER) exceeds the time difference threshold (LIMIT). If yes, go to step S16; otherwise, go to step S22.

Step S16: Correct the local clock.

If the second clock offset value exceeds the set time difference threshold, the local clock is corrected.

If the second clock offset value (OFFSET-SERVER) exceeds the time difference threshold (LIMIT), the local clock is considered abnormal, and the local clock is immediately corrected to be the same as SERVER-TIME; otherwise, the second NTP-I server clock is abnormal, the first NTP-I server Do nothing.

Step S17: The second NTP-I server queries the third clock deviation value of itself and the first NTP-I server according to the set time interval.

The second NTP-I server sends a third clock deviation query request to the first NTP-I server according to the set query time interval, and receives the first and the first NTP-I server returning after receiving the third clock deviation query request. The third clock offset value of the two NTP-I servers.

Referring to steps 2.1 and 2.2 of FIG. 1, respectively, the second NTP-I server sends a clock deviation query request to the first NTP-I server and a clock offset value of the first NTP-I server returning itself and the second NTP-I server. Step S2.1 uses the "ntpdate -d {NTP-I-1 }" command to perform a clock deviation query, and step S2.2 returns the first clock offset value (OFFSET-REMOTE). Step S18: It is judged whether the third clock deviation value exceeds the set time difference threshold. If yes, go to step S19; otherwise, go to step S22.

The third clock offset value (OFFSET-REMOTE) is compared to the time difference threshold (LIMIT). When the third clock offset value (OFFSET-REMOTE) exceeds the time difference threshold (LIMIT), a subsequent query operation is performed, otherwise the clock is considered normal and no operation is performed.

Step S19: The second NTP-I server queries the fourth clock offset between itself and the NTP-T server.

When the third clock deviation value exceeds the set time difference threshold, the second NTP-I server queries the fourth clock deviation value of itself and the NTP-T server.

The first NTP-I server sends a second clock deviation query request to the NTP-T server; receiving

The second clock deviation value of the NTP-T server returned by the NTP-T server after receiving the second clock deviation query request and the first NTP-I server and the standard clock of the first NTP-I server; the first NTP-I server determines that the second clock deviation value exceeds the setting When the time difference threshold is set, the local clock is corrected according to the received standard clock.

Referring to steps 2.3 and 2.4 of Figure 2, the second NTP-I server sends a clock deviation query request to the NTP-T server and the NTP-T server returns the clock offset value of itself and the second NTP-I server. Step S2.3 uses the "ntpdate -d {NTP-T}" command to perform clock deviation query. Step S2.4 returns the fourth clock offset value (OFFSET-SERVER) and the NTP-T server's own standard clock (referred to as SERVER for short). -TIME ) , which is the current time of the NTP-T server.

Step S20: Determine whether the fourth clock deviation value exceeds the set time difference threshold.

Compares whether the fourth clock deviation value (OFFSET-SERVER) exceeds the time difference threshold (LIMIT). If yes, go to step S21; otherwise, go to step S22.

Step S21: Correct the local clock.

If the fourth clock deviation value exceeds the set time difference threshold, the local clock is corrected.

If the fourth clock offset value (OFFSET-SERVER) exceeds the time difference threshold (LIMIT), the local clock is considered abnormal, and the local clock is immediately corrected to be the same as SERVER-TIME; otherwise An NTP-I server clock is abnormal, and the second NTP-I server does nothing.

Step S22: End.

The above method adds an NTP-I server to the IPTV system to complement the two NTP-I servers. The clock protection program is started in both NTP-I servers to protect and correct the clocks. For the service server, two NTP-I servers can be one master and one standby, and for the set-top box, one of them can be selected as the server provided by the clock.

The NTP server clock synchronization maintaining method and system are provided by the embodiment of the present invention. The NTP server is also provided. The structure of the NTP server is as shown in FIG. 4, and includes: a clock synchronization module 101, a first query module 102, and a Two query module 103.

The clock synchronization module 101 is configured to synchronize the clock from the telecommunication NTP-T server.

The first query module 102 is configured to query the first clock offset value of the second NTP-I server according to the set time interval.

The second query module 103 is configured to query the second clock offset value of the self and the NTP-T server when the first clock offset value exceeds the set time difference threshold, and if the second clock offset value exceeds the set time difference threshold, Correct the local clock.

Preferably, the first query module 102 is specifically configured to: send a first clock deviation query request to the second NTP-I server according to the set query time interval; and receive the second NTP-I server to receive the first a first clock deviation value of the first NTP-I server returned by the clock deviation query request;

Preferably, the foregoing second query module 103 is specifically configured to: when the first clock deviation value exceeds the set time difference threshold, send a second clock deviation query request to the NTP-T server; and receive the NTP-T server receives the first After the second clock deviation query request, the second clock deviation value of the first NTP-I server and the standard clock of the first NTP-I server are returned; when the second clock deviation value exceeds the set time difference threshold, the local clock is corrected according to the received standard clock. clock.

The foregoing NTP server clock synchronization maintaining method and system provided by the embodiments of the present invention are applicable to When the NTP server is abnormal, the service of the NTP server is abnormal. This prevents the service of the NTP server from being abnormal. This prevents the abnormality of the clock of the NTP server as a single-point device. The system clock is garbled.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Claims

Claim

A network time protocol NTP server clock synchronization maintaining method, comprising: a first NTP-I server and a second NTP-I server synchronizing a clock from a telecommunication NTP-T server; the first NTP-I server is at a set time interval Querying a first clock offset value between the self and the second NTP-I server, and when the first clock offset value exceeds the set time difference threshold, the first NTP-I server queries the second clock offset value of the NTP-T server, Correcting the local clock if the second clock deviation value exceeds the set time difference threshold; and

The method of claim 1, wherein the first NTP-I server queries the first clock offset value of the second NTP-I server according to the set time interval, including:

The method of claim 1, wherein the second NTP-I server queries the third clock offset value of the first NTP-I server according to the set time interval, including:

The second NTP-I server sends a third clock deviation query request to the first NTP-I server according to the set query time interval, and receives the first NTP-I server returns itself after receiving the third clock deviation query request. The third clock deviation value from the second NTP-I server.

4. The method according to claim 1, wherein the first NTP-I server queries the second clock deviation value of itself and the NTP-T server, and if the second clock deviation value exceeds the set time difference threshold, corrects the local clock. , including:

The first NTP-I server sends a second clock deviation query request to the NTP-T server; Receiving a second clock deviation value of the NTP-T server and the first NTP-I server returned by the NTP-T server after receiving the second clock deviation query request and its own standard clock;

5. The method of claim 1, wherein the second NTP-I server queries itself and

The fourth clock deviation value of the NTP-T server. If the fourth clock deviation value exceeds the set time difference threshold, the local clock is corrected, including:

The method according to any one of claims 1 to 5, wherein the clock synchronization service is provided to the service server by the first NTP-I server and/or the second NTP-I server, and the first NTP-I server is used. Or the second NTP-I server provides clock synchronization services for the set top box.

7. An NTP server clock synchronization maintaining system, comprising:

a second NTP-I server, configured to synchronize a clock from the telecommunication NTP-T server; query a third clock deviation value of the first NTP-I server according to the set time interval, when the third clock deviation value exceeds the set value When the time difference threshold is used, the second NTP-I server queries the fourth clock deviation value of itself and the NTP-T server, and if the fourth clock deviation value exceeds the set time difference threshold, the local modification is corrected. Clock.

The system of claim 7, wherein the first NTP-I server is further configured to provide a clock synchronization service for the service server and the set top box; the second NTP-I server is further configured to be a service server. Clock synchronization service and set-top box provide clock synchronization service.

9. An NTP server, including:

The NTP server according to claim 9, wherein the first query module is used to:

The NTP server according to claim 10 or 11, wherein the second query module is configured to:

When it is determined that the second clock deviation value exceeds the set time difference threshold, the local clock is corrected according to the received standard clock.