Re: [Linuxptp-users] Regarding linuxptp stack support for IEEE802.1AS-2020

[Jakub R. <j.r...@el...>]

Greetings,

While testing devices with gPTP we encountered, in our opinion, quite inconsequential behavior. Using different setups, we set following flags and had following outcome:

gmCapable = 0 , slaveOnly = 0 -> OK
gmCapable = 1 , slaveOnly = 0 -> OK
gmCapable = 0 , slaveOnly = 1 -> Cannot mix 1588 slaveOnly with 802.1AS !gmCapable
gmCapable = 1 , slaveOnly = 1 -> OK

Frankly, I would expect combination of "gmCapable = 1 , slaveOnly = 1" to fail rather than "gmCapable = 0 , slaveOnly = 1".

masterOnly flags are working properly. For some devices we really want to keep slaveOnly devices, even with gPTP, but we were surprised that these options are mutually exclusive.
Is there a particular reason only one of these cases fails to start?

Best regards
Jakub Raczynski