On Wed, May 17, 2017 at 03:12:36PM +0200, Petr Kulhavy wrote:
> After regaining the network the slave was synchronised to itself and 
> didn't want to resync to the master as I expected.

A slave cannot synchronize to itself.

> After restarting ptp4l on the slave it perfectly synchronized to the master.
> 
> Why is that?

I guess that no announce message got through to the slave.  Did you
check it with tcpdump/wireshark?

Thanks,
Richard

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