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Elshan's questions

Martin Hope
Elshan
Asked: 2024-04-05 07:15:53 +0800 CST
  • 7

我正在尝试与 PTP 同步时间；我已使用 PTP 配置 Trimble 设备。但是，当我使用具有以下配置的 LinuxPTP 时，本地时钟始终被选为最佳主时钟。

ptp4l[892.103]: selected local clock 00032d.fffe.55bd3b as best master

我想知道为什么它不选择 Trimble 设备作为主时钟。

设备通过 SFP/光纤电缆连接。

  • PTP 配置文件 -/etc/linuxptp/ptpv2.conf 
    [global]
verbose         1  
domainNumber    24
clockClass      6
priority1       128
priority2       128
[enp11s0]
  • 像这样运行sudo并控制台此输出。 
    $ sudo ptp4l -f /etc/linuxptp/ptpv2.conf 
ptp4l[886.038]: selected /dev/ptp7 as PTP clock
ptp4l[886.039]: port 1 (enp11s0): INITIALIZING to LISTENING on INIT_COMPLETE
ptp4l[886.039]: port 0 (/var/run/ptp4l): INITIALIZING to LISTENING on INIT_COMPLETE
ptp4l[886.039]: port 0 (/var/run/ptp4lro): INITIALIZING to LISTENING on INIT_COMPLETE
ptp4l[892.103]: port 1 (enp11s0): LISTENING to MASTER on ANNOUNCE_RECEIPT_TIMEOUT_EXPIRES
ptp4l[892.103]: selected local clock 00032d.fffe.55bd3b as best master
ptp4l[892.103]: port 1 (enp11s0): assuming the grand master role
  • 我还捕获了 Wireshark 公告消息，看看是否有助于调试此消息。 
    Frame 9466: 78 bytes on wire (624 bits), 78 bytes captured (624 bits) on interface enp11s0, id 0
Ethernet II, Src: Trimble_70:07:6a (00:17:47:70:07:6a), Dst: IEEEI&MS_00:00:00 (01:1b:19:00:00:00)
Precision Time Protocol (IEEE1588)
    0000 .... = majorSdoId: Unknown (0x0)
    .... 1011 = messageType: Announce Message (0xb)
    0000 .... = minorVersionPTP: 0
    .... 0010 = versionPTP: 2
    messageLength: 64
    domainNumber: 24
    minorSdoId: 0
    flags: 0x003c
        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
        .... .... .0.. .... = SYNCHRONIZATION_UNCERTAIN: False
        .... .... ..1. .... = FREQUENCY_TRACEABLE: True
        .... .... ...1 .... = TIME_TRACEABLE: True
        .... .... .... 1... = PTP_TIMESCALE: True
        .... .... .... .1.. = PTP_UTC_REASONABLE: True
        .... .... .... ..0. = PTP_LI_59: False
        .... .... .... ...0 = PTP_LI_61: False
    correctionField: 0.000000 nanoseconds
        correction: Ns: 0 nanoseconds
        correctionSubNs: 0 nanoseconds
    messageTypeSpecific: 0
    ClockIdentity: 0x001747fffe70076a
        MAC Vendor: Trimble
    SourcePortID: 1
    sequenceId: 28828
    controlField: Other Message (5)
    logMessagePeriod: -3
    originTimestamp (seconds): 0
    originTimestamp (nanoseconds): 0
    originCurrentUTCOffset: 37
    priority1: 128
    grandmasterClockClass: 6
    grandmasterClockAccuracy: The time is accurate to within 100 ns (0x21)
    grandmasterClockVariance: 20061
    priority2: 128
    grandmasterClockIdentity: 0x001747fffe70076a
    localStepsRemoved: 0
    TimeSource: GPS (0x20)
  • 同步命令 
    phc2sys -w -m -s enp11s0 -c CLOCK_REALTIME

当我在互联网上检查其他一些配置时，他们的日志显示正确的时钟选择，但我的总是选择最好的主时钟作为本地时钟，并且它不会同步主/边界时钟的时间（现在，我我使用的是带有 GPS 的 Trimble 1570001820 设备）。

其他注意事项：

  • NTP 已禁用
  • 硬件能够处理 PTP，并且安装了最新的驱动程序。
synchronization