Re: [Linuxptp-users] PTP4L syncing on (gPTP aware) switch A, but not B

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

On Thu, Feb 19, 2015 at 02:00:16PM +0100, Axel Holzinger wrote:
> Hi all,
> 
> I have two gPTP aware switches here and a PC with i210 and with switch A
> ptp4l is syncing fine, while with switch B not. Could anybody point me in a
> direction how I can find out what ptp4l doesn't like regarding switch B. It
> always selects itself as best master continously (i210 MAC is
> a0-36-9f-47-60-48). Prios are the same for switch A and B.

Increase the message level to take a look at the asCapable port
variable.  There are quite a number of conditions.

Some other ideas:

Use wireshark to find out what, if any, messages are being exchanged.

In port.c, there are quite a few places where silently we drop invalid
messages.  You can hack in a few debugging statements to find out what
is going on, especially WRT asCapable.

Good luck,
Richard