[PTP][1588v2] Delay_Resp消息

一、报文格式

bash 复制代码

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

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
receiveTimestamp	10 bytes	接收时间戳。
requestingPortIdentity	10 bytes	请求端口标识。

二、报文示例

(1) 基于UDP的Delay_Resp消息

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Frame 1: 104 bytes on wire (832 bits), 104 bytes captured (832 bits)
Ethernet II, Src: HuaweiTe_92:27:fe (28:6e:d4:92:27:fe), Dst: HuaweiTe_00:00:11 (00:18:82:00:00:11)
Internet Protocol Version 4, Src: 10.1.1.20 (10.0.1.50), Dst: 10.0.1.2 (10.0.1.2)
User Datagram Protocol, Src Port: ptp-general (320), Dst Port: ptp-general (320)
Precision Time Protocol (IEEE1588)
    0001 .... = transportSpecific: 0x01
    .... 1001 = messageId: Delay_Resp Message (0x09)
    .... 0010 = versionPTP: 2
    messageLength: 54
    subdomainNumber: 0
    flags: 0x0400
        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
        .... .... ..0. .... = FREQUENCY_TRACEABLE: False
        .... .... ...0 .... = TIME_TRACEABLE: False
        .... .... .... 0... = PTP_TIMESCALE: False
        .... .... .... .0.. = PTP_UTC_REASONABLE: False
        .... .... .... ..0. = PTP_LI_59: False
        .... .... .... ...0 = PTP_LI_61: False
    correction: 0.000000 nanoseconds
        correction: Ns: 0 nanoseconds
        SubNs: 0.000000 nanoseconds
    ClockIdentity: 0x00188200000085ba
    SourcePortID: 1
    sequenceId: 48672
    control: Delay_Resp Message (3)
    logMessagePeriod: -7
    receiveTimestamp (seconds): 7760
    receiveTimestamp (nanoseconds): 764820450
    requestingSourcePortIdentity: 0x704433fffe297564
    requestingSourcePortId: 4363

(2) 基于以太的Delay_Resp消息

bash 复制代码

Frame 1: 76 bytes on wire (608 bits), 76 bytes captured (608 bits)
Ethernet II, Src: HuaweiTe_92:27:fe (28:6e:d4:92:27:fe), Dst: HuaweiTe_00:00:11 (00:18:82:00:00:11)
    Destination: HuaweiTe_00:00:11 (00:18:82:00:00:11)
    Source: HuaweiTe_92:27:fe (28:6e:d4:92:27:fe)
    Type: 802.1Q Virtual LAN (0x8100)
Precision Time Protocol (IEEE1588)
    0001 .... = transportSpecific: 0x01
    .... 1001 = messageId: Delay_Resp Message (0x09)
    .... 0010 = versionPTP: 2
    messageLength: 54
    subdomainNumber: 0
    flags: 0x0400
        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
        .... .... ..0. .... = FREQUENCY_TRACEABLE: False
        .... .... ...0 .... = TIME_TRACEABLE: False
        .... .... .... 0... = PTP_TIMESCALE: False
        .... .... .... .0.. = PTP_UTC_REASONABLE: False
        .... .... .... ..0. = PTP_LI_59: False
        .... .... .... ...0 = PTP_LI_61: False
    correction: 0.000000 nanoseconds
        correction: Ns: 0 nanoseconds
        SubNs: 0.000000 nanoseconds
    ClockIdentity: 0x00188200000085ba
    SourcePortID: 1
    sequenceId: 48672
    control: Delay_Resp Message (3)
    logMessagePeriod: -7
    receiveTimestamp (seconds): 7760
    receiveTimestamp (nanoseconds): 764820450
    requestingSourcePortIdentity: 0x704433fffe297564
    requestingSourcePortId: 4363

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