Given a non-PTP switch (e.g. no hardware support for time stamping), how can one make it to be as close as possible to a PTP compliant switch. I am thinking here to configure the switch such that the PTP traffic has the highest priority (which is kind of super basic configuration). Can you please suggest other possible configurations?
PS: I am aware that in general such configurations are hardware dependent given the switch capabilities. Therefore I am looking for all kind of crazy options.
Best Answer
How about using a hub rather than a switch?
It might be a stretch since your question has "switch" right there in the title, but you did say:
Using a hub would avoid the jitter induced by the switch's queue.
I just ran a test where I measured the maximum offset after convergence between two PTP devices first on an unmanaged switch, and then on a hub.
As you can see, nearly an order of magnitude improvement.