IEEE 1588v2 PTP deamon

The PTP daemon (PTPd) implements the Precision Time protocol (PTP) as defined by the IEEE 1588 standard. PTP was developed to distribute very precise time information among network components. It becomes very popular in TDM over Ethernet networks, where timing information should be distributed from Master (Grandmaster) clock to Slaves (cliens of PTP). The IEEE1588v2 standard (2008) includes mappings to User Datagram Protocol (UDP)/Internet Protocol (IP), DeviceNet, and a layer-2 Ethernet implementation. The standard permits synchronization accuracies better than 1 ns.

You can use Linux PC with PTPd running in Master, Slave, Transparent clock mode as described in IEEE1588-2008. The steps below show as install and run PTPd:

1. Download the latest PTPd version from the project page: http://sourceforge.net/projects/ptpd/files/

2. Extract the source code from archive:

    # tar -xzvf ptpd-2.2.0.tar.gz


3. Compile the executable binnary file for PTPd:

    # cd ptpd-2.2.0/src/
    # make

4. To run PTPd:

    # ./ptpd2

ptpd2:
   -gGW          Protocol mode (slave/master with ntp/master without ntp)
   -b <dev>      Interface to use

   -cC  -DVfS    Console / verbose console;     Dump stats / Interval / Output file / no Syslog
   -uU           Unicast/Hybrid mode


   -hHB           Summary / Complete help file / run-time debug level

ERROR: Please select program mode


You should select the required mode to run the PTPd on your Linux PC:

  • Master only: PTPd listens eth1 interface (-b option) and writes debug info in the  /var/log/ptpd.log file:

    #./ptpd2 -b eth1 -c -G -D -f /var/log/ptpd.log


  •  Slave only: PTPd listens eth1 interface (-b option) in unicast mode (-u) and writes debug info in the  /var/log/ptpd.log file, it is assumed that the IP of Master is 10.1.0.11:

    #./ptpd2 -b eth1 -c -u 10.1.0.11 -g -D -f /var/log/ptpd.log


P.S. Looks line the latest PTPd (2.2.0) version has some bugs related to Unicast Request Mode. For some modes (without NTP) it is required to kill/stop NTP processe if it is already running on the Linux PC.

11 comments:

  1. ILESH PATEL23 March 2013 at 17:23

    hi,
    I got following error when i enter the master only command.

    root@NEWI5:/home/rajiv/Ilesh/ptpd-2.2.0/src# ./ptpd2 -b eth1 -c -G -D -f /var/log/ptpd.log
    Error: Multiple ptpd2 instances detected (-L to ignore lock file /var/run/kernel_clock)

    ReplyDelete
    Replies
    1. brm1 April 2013 at 14:19

      Looks like another ptpd2 process already runnung on your PC.
      To check this:

      # ps -axf | grep ptpd2

      Delete
    2. Unknown23 April 2013 at 13:29

      HELLO I have the same PROBLEM
      PLZ HELP :)

      Delete
  2. Unknown23 April 2013 at 13:23

    This comment has been removed by the author.

    ReplyDelete
  3. ILESH PATEL10 June 2013 at 10:48

    Hi,

    Thanks brm,
    its nice i got it.

    Now i received message in log file as follow :

    state: 2013-06-10 13:06:38:899386, slv, 3085a9eaa18a:01, owd: 0.000000000, ofm:
    state: 2013-06-10 13:06:40:899373, slv, 3085a9eaa18a:01, owd: 0.000000000, ofm:

    can you tell me how to elaborate or analyze it.

    ReplyDelete
  4. ILESH PATEL10 June 2013 at 11:08

    Can you tell me it give hardware time stamping value or software time stamping ?

    ReplyDelete
    Replies
    1. brm10 June 2013 at 12:06

      I'm not sure. I think it has software time stamping. Study the help/user manuals for ptpd2.

      Delete
  5. Anonymous12 June 2013 at 21:26

    Hi,
    Could you tell me if PTPd implements the profile Telecom (G.8265.1)?
    Thanks.

    ReplyDelete
  6. Ronak Patel12 September 2013 at 13:35

    Getting below error on master
    linux-vgz3:~/ptpd-2.2.0/ptpd-2.2.0/src # ./ptpd2 -b eth0 -G -D -f ptpd.log
    Warning: 0 ntpd daemon(s) detected in parallel, but we were expecting 1. Continuing anyway.
    linux-vgz3:~/ptpd-2.2.0/ptpd-2.2.0/src #

    ReplyDelete
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  8. RAVISH22 April 2015 at 20:34

    I am working on a project to virtually implement PTP on 3 VMs running CentOS 7. I am using ptpd2 ver 2.3 rc3 for the purpose and am stuck now with following rsults and configurations :-

    I made 2 VMs on VMWorkstation and isstalled CentOS 7 on both.

    Then i installed PTPd2.3 on both and run following commands :-

    ptpd2 -C -M -i eno16777736 -u 192.168.249.145 -S -L (On master - .145 being my slave machine)
    ptpd2 -C -s -i eno16777736 -u 192.168.249.142 -S -L (On slave - .142 being my slave machine)

    Master displays following messages :-
    [root@localhost src]# ptpd2 -C -M -i eno16777736 -u 192.168.249.145 -S -L
    2015-04-22 04:57:52.169901 ptpd2[13636].startup (info) () Configuration OK
    2015-04-22 04:57:52.172203 ptpd2[13636].startup (info) () Successfully acquired lock on /var/run/ptpd2.lock
    2015-04-22 04:57:52.172310 ptpd2[13636].startup (notice) (___) PTPDv2 started successfully on eno16777736 using "masteronly" preset (PID 13636)
    2015-04-22 04:57:52.208329 ptpd2[13636].eno16777736 (notice) (lstn_init) Now in state: PTP_LISTENING
    2015-04-22 04:57:53.585482 ptpd2[13636].eno16777736 (notice) (mst) Now in state: PTP_MASTER, Best master: 000c29fffe4575a2(unknown)/01 (self)

    Slave is able to detect my .145 machine as master clock and displays following :-
    [root@localhost Desktop]# ptpd2 -C -s -i eno16777736 -u 192.168.249.142 -S -h -L -a
    Warning: It is recommended to set the delay request interval (ptpengine:log_delayreq_interval) in unicast mode
    2015-04-22 05:36:11.169388 ptpd2[5779].startup (info) () Configuration OK
    2015-04-22 05:36:11.172710 ptpd2[5779].startup (notice) () PTPDv2 started successfully on eno16777736 using "slaveonly" preset (PID 5779)
    2015-04-22 05:36:11.188558 ptpd2[5779].eno16777736 (info) (init) Observed_drift loaded from kernel: -18411
    2015-04-22 05:36:11.188598 ptpd2[5779].eno16777736 (notice) (lstn_init) Now in state: PTP_LISTENING
    2015-04-22 05:36:11.748632 ptpd2[5779].eno16777736 (info) (lstn_init) New best master selected: 000c29fffe4575a2(unknown)/01
    2015-04-22 05:36:11.748815 ptpd2[5779].eno16777736 (notice) (slv) Now in state: PTP_SLAVE, Best master: 000c29fffe4575a2(unknown)/01
    2015-04-22 05:36:12.747693 ptpd2[5779].eno16777736 (notice) (slv) Received first Sync from Master
    2015-04-22 05:36:12.747811 ptpd2[5779].eno16777736 (notice) (slv) Servo: Going to slew the clock with the maximum frequency adjustment

    This is the entry on ptpd.log file of slave machine:-
    2015-04-22 04:12:34.542680 ptpd2[1938].startup (info) () Info: Now running as a daemon
    2015-04-22 04:12:34.561277 ptpd2[1938].startup (info) () Successfully acquired lock on /var/run/ptpd2.lock
    2015-04-22 04:12:34.561307 ptpd2[1938].startup (notice) (___) PTPDv2 started successfully on eno16777736 using "slaveonly" preset (PID 1938)
    2015-04-22 04:12:34.565580 ptpd2[1938].eno16777736 (info) (init) Observed_drift loaded from kernel: -18411
    2015-04-22 04:12:34.649248 ptpd2[1938].eno16777736 (notice) (lstn_init) Now in state: PTP_LISTENING
    2015-04-22 04:13:34.567002 ptpd2[1938].eno16777736 (warning) (lstn_init) Still in LISTENING after 5 restarts - will do a full network reset
    2015-04-22 04:13:34.659894 ptpd2[1938].eno16777736 (notice) (lstn_reset) Now in state: PTP_LISTENING
    2015-04-22 04:14:34.715744 ptpd2[1938].eno16777736 (warning) (lstn_reset) Still in LISTENING after 5 restarts - will do a full network reset
    2015-04-22 04:14:34.795028 ptpd2[1938].eno16777736 (notice) (lstn_reset) Now in state: PTP_LISTENING
    2015-04-22 04:15:34.909602 ptpd2[1938].eno16777736 (warning) (lstn_reset) Still in LISTENING after 5 restarts - will do a full network reset
    2015-04-22 04:15:34.979416 ptpd2[1938].eno16777736 (notice) (lstn_reset) Now in state: PTP_LISTENING

    Is it the right way? What should I be looking at?
    How to determine whether slave machine is synching to master?

    Please help me…am not able to find clarity anywhere.

    Regards
    Ravish

    ReplyDelete

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