Re: [Linuxptp-users] ANNOUNCE_RECEIPT_TIMEOUT_EXPIRES error when slave syncs with GM

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

On Sat, Sep 10, 2022 at 09:18:04PM +0530, Raj wrote:
> We are observing that When ECU1 is active ECU2 initially takes a long time
> (randomly 10 sec - 2min approx) to sync with ECU1(GM) and once ECU2
> successfully syncs with ECU1 then after that there is no issue. ECU2
> throwing "SLAVE to MASTER on ANNOUNCE_RECEIPT_TIMEOUT_EXPIRES" error and
> considering itself as GM by sending announce packet , after that again
> considering ECU1 as GM and going to slave mode, this fluctuation on ECU2 is
> happening intially  when ECU2 is trying to sync with ECU1 and after some
> time (randomly 10 sec -2min) ECU2 successfully  getting synchronozed with
> ECU1.
> 
> 
> The question is why does ECU2 take more time initially to select ECU1 as GM
> ?

If you capture PTP traffic on ECU2, do you see announce messages from
ECU1 every two seconds (following logAnnounceInterval=1) ?

-- 
Miroslav Lichvar