本文主要是介绍[PTP][1588v2] Delay_Resp消息，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
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 | |
+---------------------------------------------------------------------|
| 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
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: 2messageLength: 54subdomainNumber: 0flags: 0x04000... .... .... .... = 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: Falsecorrection: 0.000000 nanosecondscorrection: Ns: 0 nanosecondsSubNs: 0.000000 nanosecondsClockIdentity: 0x00188200000085baSourcePortID: 1sequenceId: 48672control: Delay_Resp Message (3)logMessagePeriod: -7receiveTimestamp (seconds): 7760receiveTimestamp (nanoseconds): 764820450requestingSourcePortIdentity: 0x704433fffe297564requestingSourcePortId: 4363
(2) 基于以太的Delay_Resp消息
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: 2messageLength: 54subdomainNumber: 0flags: 0x04000... .... .... .... = 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: Falsecorrection: 0.000000 nanosecondscorrection: Ns: 0 nanosecondsSubNs: 0.000000 nanosecondsClockIdentity: 0x00188200000085baSourcePortID: 1sequenceId: 48672control: Delay_Resp Message (3)logMessagePeriod: -7receiveTimestamp (seconds): 7760receiveTimestamp (nanoseconds): 764820450requestingSourcePortIdentity: 0x704433fffe297564requestingSourcePortId: 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 |
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