Note - this is a clone of the original https://issues.redhat.com/browse/OCPBUGS-44603

Its purpose is to track the reference configuration changes in the ZTP repository and the documentation updates associated with this change

Description of problem:

The doc[1] recommended  to configure phc2sysOpts with the following parameter '-w'.

phc2sysOpts: -r -u 0 -m -w -N 8 -R 16 -S 2 -s ens2f0 -n 24 

The issue is that when links of master or slave is down, the phc2sys is waiting for ptp4l unless any link is up.

In the T-GM node from the 'Figure 1. PTP nodes in the network' of the doc[2], ts2phc seems to update PHC directly and it seems to be referred by phc2sys. I don't think of way why the ptp4l is in the middle of the process of phc2sys. In other word, phc2sys seems to can synchronize without ptp4l. Nevertheless, the phc2sys is waiting for ptp4l with the following log.

2024-11-13T07:25:36.154544564Z phc2sys[1288096.888]: [ptp4l.0.config] Waiting for ptp4l... 

Is this expected behavior? why the ptp4l is needed for synchroniation of system clock(phc2sys) even on T-GM node?

The partner 'Samsung' wants to implementation T-GM without any links of T-BC or T-OC up. They are speaking the use case(situation) may be a maintenance or implementation step.

[1] Configuring dynamic leap seconds handling for PTP grandmaster clocks
https://docs.openshift.com/container-platform/4.14/networking/ptp/configuring-ptp.html#ptp-configuring-dynamic-leap-seconds-handling-for-tgm_configuring-ptp

[2] Elements of a PTP domain
https://docs.openshift.com/container-platform/4.14/networking/ptp/about-ptp.html#ptp-elements_about-ptp

Version-Release number of selected component (if applicable):

OCP 4.14z and later.    

Steps to Reproduce:

1. Configure T-GM without any links to T-BC/O-BC.

2. phc2sys is stuck with the following log.
~~~
2024-11-13T07:25:36.154544564Z phc2sys[1288096.888]: [ptp4l.0.config] Waiting for ptp4l...
~~~  

Actual results:

- phc2sys was stuck to synchronize system clock

Expected results:

- phc2sys synchronizes system clock without ptp4l.