linuxptp-users

[Linuxptp-users] Redundant multi-nic PTP slave

[Gijs P. <gij...@si...>]

Sorry if this question has been asked and answered before, I've been 
unable to find definitive answers on the web.

In our setup we're required to receive PTP on multiple NIC's for 
redundancy reasons, these are MLX5 cards and each port has it's on PHC. 
Currently the way it's setup is that we run a separate ptp4l instance 
for each port. And run only one phc2sys instance to sync from primary 
card to system clock. We currently don't have any scripts around this to 
control failover behavior or have tooling to keep a failed instance 
synced to the working instance.

What would be the recommended setup for our requirements?
We've tried using ptp4l in JBOD mode, but this seems to be sub optimal 
as we've observed ptp4l continuously switching master clock between the 
interfaces.


Br,


Gijs Peskens

Re: [Linuxptp-users] Redundant multi-nic PTP slave

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

On Mon, Jun 13, 2022 at 09:11:07AM +0200, Gijs Peskens wrote:
> In our setup we're required to receive PTP on multiple NIC's for redundancy
> reasons, these are MLX5 cards and each port has it's on PHC. Currently the
> way it's setup is that we run a separate ptp4l instance for each port. And
> run only one phc2sys instance to sync from primary card to system clock. We
> currently don't have any scripts around this to control failover behavior or
> have tooling to keep a failed instance synced to the working instance.
> 
> What would be the recommended setup for our requirements?

Run multiple phc2sys instances configured to not control the clock,
but feed another process like chronyd/ntpd which can select good
sources and combine them for the synchronization of the clock.

With the timemaster program included in linuxptp it is easy to
configure.

-- 
Miroslav Lichvar