Re: [Linuxptp-users] Multi-profile grandmaster

On Wed, Dec 06, 2023 at 08:19:49AM +0000, Erling Rennemo Jellum wrote:
> We are in the situation where we want to synchronize multiple devices where some only support the E2E delay mechanism and others only support the P2P delay mechanism (the gPTP profile specifically). Ideally, we would just use a single network interface on the grandmaster. See below for a Figure illustrating a possible topology. It would mean that the GM should exchange Peer Delay messages with the switch (which is a Transparent Clock), while also replying to Delay Request messages from the E2E slave, and sending out Sync+Follow Up to both the E2E and the P2P slave.
> 
> Has anyone looked into this before? I guess it would be possible with two isolated networks and two instances of linuxPTP operating on two different network interfaces, but can it work on a single network?

>From the PTP point of view it could work with two different PTP domain
numbers. The GM can run multiple ptp4l instances. They can even share
the same PHC, no need for vclocks.

But practically I think it will depend on the switch whether it can be
configured for such operation.

-- 
Miroslav Lichvar