Hello,
I try to be PTP synchronized with my network over UDP. Although I receive
PTP packets (tested with tcpdump, see below for capture), when I run ptp4l,
the local clock is elected as best master. It is as if there was no other
master clock in the network. I can't find why.
Here are some details of my environment :
NIC : Intel X710
NIC driver : i40e 2.4.6 (latest, compiled with CFLAGS_EXTRA="-DI40E_PTP")
NIC firmware : NVM 6.01 (latest)
Kernel version : 3.10.0-693.21.1.e17.x86_64
CentOS 7.4.1708
linuxptp : 1.8
I tried with linux ptp from 1.6 to 1.9.2.
I tried with different i40e driver/NIC firmware/kernel/linuxptp matching
version.
I know for sure that in my network, there is a working grand master. There
is a switch in between me and the master but the switch is normally
properly configurated.
The config I use for ptp4l match the grand master's one.
Here is the output of ptp4l :
ptp4l -i interface -f /etc/ptp4l.conf -smq
ptp4l[5042.815]: selected /dev/ptp1 as PTP clock
ptp4l[5042.816]: port 1: INITIALIZING to LISTENING on INITIALIZE
ptp4l[5042.816]: port 0: INITIALIZING to LISTENING on INITIALIZE
ptp4l[5042.816]: port 1: link up
ptp4l[5043.674]: selected best master clock 3cfdfe.fffe.a13059
ptp4l[5044.576]: selected best master clock 3cfdfe.fffe.a13059
ptp4l[5045.573]: selected best master clock 3cfdfe.fffe.a13059
I get the same exact output if i don't even use a config file.
The MAC address 3c:fd:fe:a1:30:59 is the MAC adress of the specified
interface. (The interface that should be slave!)
I don't have any logs like "new foreign master" ...
Here is what a tcpdump on the interface looks like :
15:59:18.470412 IP 10.22.8.19.ptp-general > 224.0.1.129.ptp-general: UDP,
length 60
15:59:18.471144 IP 10.22.8.3.ptp-general > 224.0.1.129.ptp-general: UDP,
length 60
15:59:18.471441 IP 10.22.8.19.ptp-general > 224.0.1.129.ptp-general: UDP,
length 60
15:59:18.472071 IP 10.22.8.19.ptp-general > 224.0.1.129.ptp-general: UDP,
length 60
15:59:18.472552 IP 10.22.8.3.ptp-general > 224.0.1.129.ptp-general: UDP,
length 60
15:59:18.473185 IP 10.22.8.3.ptp-general > 224.0.1.129.ptp-general: UDP,
length 60
15:59:18.473656 IP 10.22.8.19.ptp-general > 224.0.1.129.ptp-general: UDP,
length 60
15:59:18.476813 IP 10.195.1.250.ptp-general > 224.0.1.129.ptp-general: UDP,
length 100
15:59:18.479403 IP 10.22.8.3.ptp-general > 224.0.1.129.ptp-general: UDP,
length 60
15:59:18.479816 IP 10.22.8.19.ptp-general > 224.0.1.129.ptp-general: UDP,
length 60
15:59:18.482479 IP 10.195.1.250.ptp-general > 224.0.1.129.ptp-general: UDP,
length 100
15:59:18.485089 IP 10.22.8.3.ptp-general > 224.0.1.129.ptp-general: UDP,
length 60
15:59:18.485488 IP 10.22.8.19.ptp-general > 224.0.1.129.ptp-general: UDP,
length 60
15:59:18.487728 IP 10.195.1.250.ptp-general > 224.0.1.129.ptp-general: UDP,
length 100
15:59:18.490379 IP 10.22.8.3.ptp-general > 224.0.1.129.ptp-general: UDP,
length 60
15:59:18.490897 IP 10.22.8.19.ptp-general > 224.0.1.129.ptp-general: UDP,
length 60
15:59:18.491309 IP 172.27.105.251.ptp-event > 224.0.1.129.ptp-event: UDP,
length 44
15:59:18.518822 IP 172.27.105.251.ptp-general > 224.0.1.129.ptp-general:
UDP, length 44
15:59:18.616328 IP 172.27.105.251.ptp-event > 224.0.1.129.ptp-event: UDP,
length 44
15:59:18.620510 IP 172.27.105.251.ptp-general > 224.0.1.129.ptp-general:
UDP, length 44
I must be missing something. Any help is appreciated. I can provide other
information if needed !
Thanks.
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