Re: [Linuxptp-users] IEEE802.1AS gPTP Boundary Clock

[Miroslav L. <mli...@re...>]

On Mon, Feb 06, 2023 at 03:21:25PM +0000, Nemo Crypto wrote:
> Hi Linuxptp-users,
> I am using gPTP 802.1AS profile for my network. My simplified network topology looks like this,
> TimeLeader --> Eth Switch (802.1as Time Aware Bridge)-->Processor (BC?)--->TimeFollower
> In the above topology, The processor runs linuxptp (ptp4l & phc2sys) has 2 interfaces. One interface should act as 802.1AS TimeFollower and other should act as 802.1AS TimeLeader. I know that IEEE1588 BoundaryClock has this feature. But I am not sure if 802.1AS (gPTP) has similar feature. 
> 
> Can you please share me details? If this is supported by LinuxPTP, can you please help me how would the configuration file look like? 

IIRC gPTP has time-aware bridges which are equivalent to PTP boundary
clocks. ptp4l as a boundary clock doesn't require any special
configuration. For a gPTP example see configs/gPTP.cfg in the linuxptp
tarball/repository.

If your interfaces don't share a PTP clock, you will need to enable
the boundary_clock_jbod option and run phc2sys to keep the two PHCs
synchronized. However, that might not meet the gPTP requirements on
accuracy.

-- 
Miroslav Lichvar