Re: [Linuxptp-users] Issue when partner machine reboots

[Richard C. <ric...@gm...>]

On Thu, May 03, 2012 at 10:37:30PM +0000, Keller, Jacob E wrote:
> I am having an issue when two machines are hooked up for ptp. If one
> side reboots, the other side will never recover. This happens even
> after the port timeout for reseting the fault. I think the reason
> this occurs is because the socket for UDP goes invalid when the
> interface goes down because of the loss of link. Is there a way to
> solve this so that ptp4l would properly re-initialize when coming
> back? (attempt to re-get the entire sockets etc?)
>
> Or is this just an invalid usecase and I should expect to have to
> reset the daemon if its partners go down?

I am aware of the problem with a link down. Once the link does down,
the UDP socket is no longer valid. I don't really understand why that
should be the case, but probably we will just have to live with it.

I think the solution will be to open an additional netlink socket and
poll for the link events. Link down should trigger a port fault, and
then the port reset will then re-open the socket.

But that will take some time.

Thanks,
Richard