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[PTP][1588v2] Sync消息和Delay_Req消息

栖桐 2024-06-01 阅读 9
PTP时钟芯片EthernetTime字段Html/CSS前端开发


一、报文格式

+0------3--------7--------11--------15--------------------------------31
|TranSpec|MsgType|Reserved1| VerPTP |              MsgLength          |
+----------------|------------------|---------------------------------|
|  DomainNumber  |      Reserved2   |              FlagField          |
+---------------------------------------------------------------------|
|                             CorrectionField                         |
|                                                                     |
+---------------------------------------------------------------------|
|                                Reserved3                            |
+---------------------------------------------------------------------|
|                          SourcePortIdentity                         |
|                                                                     |
|                                   +---------------------------------|
|                                   |SequenceID                       |
+----------------|------------------|---------------------------------|
|  ControlField  |  LogMsgInterval  |                                 |
+---------------------------------------------------------------------|
|                           OriginTimestamp                           |
|                                                                     |
|                                   |                                 |

字段

长度

含义

TranSpec

4 bits

传送相关。

0–表示PTP消息由1588协议使用

1–表示PTP消息由802.1as协议使用

MsgType

4 bits

0x00: Sync

0x01: Delay_Req

Reserved1

4 bits

保留字段。

VerPTP

4 bits

表示1588协议的版本。

MsgLength

2 bytes

PTP消息的长度，即PTP消息的全部字节数目。

计入字节始于报头的第一个字节，同时包含并收尾于任何尾标的最后一个字节，或是无尾标成员时收尾于消息的最后一个字节。

DomainNumber

1 byte

域编号，表示发送该消息时钟所属的域

Reserved2

1 byte

保留字段。

FlagField

2 bytes

标志域。

CorrectionField

CorrectionField

修正域，各报文都有，主要用在Sync报文中，用于补偿网络中的传输时延，E2E的频率同步。

Reserved3

4 bytes

保留字段。

SourcePortIdentity

10 bytes

源端口标识符，发送该消息时钟的ID和端口号。

SequenceID

2 bytes

序列号ID，表示消息的序列号，以及关联消息的对应关系。

ControlField

1 byte

控制域，由消息类型决定。

LogMsgInterval

1 byte

录入消息周期，PTP消息的发送时间间隔

OriginTimestamp

10 bytes

源时间标签。

二、报文示例

(1) 基于UDP的Sync消息

Frame 1: 90 bytes on wire (720 bits), 90 bytes captured (720 bits)
Ethernet II, Src: 0a:2a:0a:31:0a:13 (0a:2a:0a:31:0a:13), Dst: IeeeI&MS_00:00:00 (01:1b:19:00:00:00)
Internet Protocol Version 4, Src: 10.1.1.1 (10.1.1.1), Dst: 224.0.1.129 (224.0.1.129)
User Datagram Protocol, Src Port: ptp-event (319), Dst Port: ptp-event (319)
Precision Time Protocol (IEEE1588)
    0000 .... = transportSpecific: 0x00
    .... 0000 = messageId: Sync Message (0x00)
    .... 0010 = versionPTP: 2
    messageLength: 44
    subdomainNumber: 0
 flags: 0x002c
        0... .... .... .... = PTP_SECURITY: False
        .0.. .... .... .... = PTP profile Specific 2: False
        ..0. .... .... .... = PTP profile Specific 1: False
        .... .0.. .... .... = PTP_UNICAST: False
        .... ..0. .... .... = PTP_TWO_STEP: False
        .... ...0 .... .... = PTP_ALTERNATE_MASTER: False
        .... .... ..1. .... = FREQUENCY_TRACEABLE: True
        .... .... ...0 .... = TIME_TRACEABLE: False
        .... .... .... 1... = PTP_TIMESCALE: True
        .... .... .... .1.. = PTP_UTC_REASONABLE: True
        .... .... .... ..0. = PTP_LI_59: False
        .... .... .... ...0 = PTP_LI_61: False
    correction: 0.144547 nanoseconds
        correction: Ns: 0 nanoseconds
    ClockIdentity: 0x00259e1000000001
    SourcePortID: 1280
    sequenceId: 62761
    control: Sync Message (0)
    logMessagePeriod: -10
    originTimestamp (seconds): 947130386
    originTimestamp (nanoseconds): 414447272

(2) 基于以太的Sync消息

Frame 1: 64 bytes on wire (512 bits), 64 bytes captured (512 bits)
Ethernet II, Src: 0a:2a:0a:31:0a:13 (0a:2a:0a:31:0a:13), Dst: HuaweiTe_98:f2:6e (00:25:9e:98:f2:6e)
    Destination: HuaweiTe_98:f2:6e (00:25:9e:98:f2:6e)
    Source: 0a:2a:0a:31:0a:13 (0a:2a:0a:31:0a:13)
    Type: PTPv2 over Ethernet (IEEE1588) (0x88f7)
Precision Time Protocol (IEEE1588)
    0000 .... = transportSpecific: 0x00
    .... 0000 = messageId: Sync Message (0x00)
    .... 0010 = versionPTP: 2
    messageLength: 44
    subdomainNumber: 0
flags: 0x042c
        0... .... .... .... = PTP_SECURITY: False
        .0.. .... .... .... = PTP profile Specific 2: False
        ..0. .... .... .... = PTP profile Specific 1: False
        .... .1.. .... .... = PTP_UNICAST: True
        .... ..0. .... .... = PTP_TWO_STEP: False
        .... ...0 .... .... = PTP_ALTERNATE_MASTER: False
        .... .... ..1. .... = FREQUENCY_TRACEABLE: True
        .... .... ...0 .... = TIME_TRACEABLE: False
        .... .... .... 1... = PTP_TIMESCALE: True
        .... .... .... .1.. = PTP_UTC_REASONABLE: True
        .... .... .... ..0. = PTP_LI_59: False
        .... .... .... ...0 = PTP_LI_61: False
correction: 0.602692 nanoseconds
        correction: Ns: 0 nanoseconds
        SubNs: 0.602692 nanoseconds
    ClockIdentity: 0x00259e1000000001
    SourcePortID: 1280
    sequenceId: 25801
    control: Sync Message (0)
   logMessagePeriod: 127
    originTimestamp (seconds): 947130222
    originTimestamp (nanoseconds): 436724034

(3) 基于UDP的Delay_Req消息

Frame 1: 94 bytes on wire (752 bits), 94 bytes captured (752 bits)
Ethernet II, Src: HuaweiTe_00:00:11 (00:18:82:00:00:11), Dst: HuaweiTe_92:27:fe (28:6e:d4:92:27:fe)
Internet Protocol Version 4, Src: 10.0.1.2 (10.0.1.2), Dst: 10.0.1.50 (10.0.1.50)
User Datagram Protocol, Src Port: ptp-event (319), Dst Port: ptp-event (319)
Precision Time Protocol (IEEE1588)
    0000 .... = transportSpecific: 0x00
    .... 0001 = messageId: Delay_Req Message (0x01)
    .... 0010 = versionPTP: 2
    messageLength: 44
    subdomainNumber: 0
    flags: 0x050a
        0... .... .... .... = PTP_SECURITY: False
        .0.. .... .... .... = PTP profile Specific 2: False
        ..0. .... .... .... = PTP profile Specific 1: False
        .... .1.. .... .... = PTP_UNICAST: True
        .... ..0. .... .... = PTP_TWO_STEP: False
        .... ...1 .... .... = PTP_ALTERNATE_MASTER: True
        .... .... ..0. .... = FREQUENCY_TRACEABLE: False
        .... .... ...0 .... = TIME_TRACEABLE: False
        .... .... .... 1... = PTP_TIMESCALE: True
        .... .... .... .0.. = PTP_UTC_REASONABLE: False
        .... .... .... ..1. = PTP_LI_59: True
        .... .... .... ...0 = PTP_LI_61: False
    correction: 0.000000 nanoseconds
        correction: Ns: 0 nanoseconds
        SubNs: 0.000000 nanoseconds
    ClockIdentity: 0x704433fffe297564
    SourcePortID: 4363
    sequenceId: 48672
    control: Delay_Req Message (1)
    logMessagePeriod: 127
    originTimestamp (seconds): 0
    originTimestamp (nanoseconds): 0

(4) 基于以太的Delay_Req消息

Frame 1: 64 bytes on wire (512 bits), 64 bytes captured (512 bits)
Ethernet II, Src: 0e:e0:f0:00:00:02 (0e:e0:f0:00:00:02), Dst: IeeeI&MS_00:00:00 (01:1b:19:00:00:00)
    Destination: IeeeI&MS_00:00:00 (01:1b:19:00:00:00)
    Source: 0e:e0:f0:00:00:02 (0e:e0:f0:00:00:02)
    Type: PTPv2.over Etherner (IEEE1588) (0x88f7)
Precision Time Protocol (IEEE1588)
    0000 .... = transportSpecific: 0x00
        ...0 .... = 802 1as conform:Flase
    .... 0001 = messageId: Delay_Req Message (0x01)
    .... 0010 = versionPTP: 2
    messageLength: 44
    subdomainNumber: 0
    flags: 0x0128
        0... .... .... .... = PTP_SECURITY: False
        .0.. .... .... .... = PTP profile Specific 2: False
        ..0. .... .... .... = PTP profile Specific 1: False
        .... .1.. .... .... = PTP_UNICAST: False
        .... ..0. .... .... = PTP_TWO_STEP: False
        .... ...1 .... .... = PTP_ALTERNATE_MASTER: True
        .... .... ..0. .... = FREQUENCY_TRACEABLE: True
        .... .... ...0 .... = TIME_TRACEABLE: False
        .... .... .... 1... = PTP_TIMESCALE: True
        .... .... .... .0.. = PTP_UTC_REASONABLE: False
        .... .... .... ..1. = PTP_LI_59: False
        .... .... .... ...0 = PTP_LI_61: False
    correction: -22895715404183.000000 nanoseconds
        correction: Ns: -22895715404183 nanoseconds
        SubNs: 0.000000 nanoseconds
    ClockIdentity: 0x00259e1000000003
    SourcePortID: 3330
    sequenceId: 19267
    control: Delay_Req Message (1)
    logMessagePeriod: 127
    originTimestamp (seconds): 0

三、参考标准

标准

描述

IEEE 1588 V2

面向网络测控系统的精密时钟同步协议

IEEE P1588™ D2.2

网络测控系统精密时钟同步协议标准草案


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