[Linuxptp-users] Does ptp4l support unicast ?

[W.F. YANG]

Hello,
Does the ptp4l support ip unicast instead of ip multicast for all
transmission, not just for delay request ?
Besides, is it a portion of ptp protocol standard ?

*Best Regards*

*Yang Wenfeng*

[Richard Cochran]

Post by W.F. YANG
Does the ptp4l support ip unicast instead of ip multicast for all
transmission, not just for delay request ?

No.

Post by W.F. YANG
Besides, is it a portion of ptp protocol standard ?

Yes, unicast is an option within the IEEE 1588 standard.


HTH,
Richard

[David Cemin]

Hi Richard,

Since it is not supported, do you know if there is anyone working on this
already ? If not, do you know what the effort would be to have this support
implemented within ptp4l ?

Thank you

regards,

David

Post by Richard Cochran

Post by W.F. YANG
Does the ptp4l support ip unicast instead of ip multicast for all
transmission, not just for delay request ?

No.

Post by W.F. YANG
Besides, is it a portion of ptp protocol standard ?

Yes, unicast is an option within the IEEE 1588 standard.
HTH,
Richard
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[Richard Cochran]

Post by David Cemin
Since it is not supported, do you know if there is anyone working on this
already ?

Not that I know of.

Post by David Cemin
If not, do you know what the effort would be to have this support
implemented within ptp4l ?

I think it would require substantial effort. It entails implementing
the following options from 1588:

16.1 Unicast message negotiation
17.5 Unicast discovery
17.6 Acceptable master table
[ Since this is very similar to the unicastMasterTable of 17.5,
you can kill two birds with one stone. ]

We already have some support for subscriptions and notifications, and
so you would naturally build upon that.

Thanks,
Richard




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