Posted on February 18, 2021 10:09 am
 |  Asked by Thorsten Schwieder
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I’m a new user to Arista EOS, my company just got a partner, but due to corona we did not yet receive trainings.
Im using a 720XP-48ZC2 with 4.25.0F version.
The switch is setup as boundary clock, the ptp master is connected to int eth 11.
A test lab device is connected to int eth 4, and I would like to wireshark all packets from/to the device connected to the int eth4.
I checked the ME-PTP-White-Paper.pdf and setup a monitor session to int eth1.
The device works and is in sync to ptp, but I don’t see all the ptp packets (announce / follow up from the ptp master, also I don’t see the delay-response messages to the test lab device connected to eth4.

Is there a way to setup the monitor session, so I can record the ptp packets via the monitor destination port?

Thanks in advance, Thorsten

Posted by Philippe Bureau
Answered on February 18, 2021 2:34 pm

Please share your monitor session configuration

Are you seeing other traffic?  if you ping the host on port Ethernet4, do you see the packets on your monitoring tool on port Ethernet1?



Posted by Thorsten Schwieder
Answered on February 19, 2021 9:35 am

Thanks for the reply.

I'm using the same commands shown in the pdf.
-#monitor session session1 source ethernet 4 both
- #monitor session session1 destination ethernet 1

#sh monitor session

Session session1

Programmed in HW: Yes

Source Ports:

Both: Et4

Destination Ports:

Et1 : active

yes, I can see traffic in both directions (mostly UDP streams) in wireshark.
The device connected to int eth 4 is up &running ok, I just need to examine the traffic for lab purpose (here specifically PTP)
The switch can also check the ptp counters (sh ptp int eth 4 counters) , these values are also ok.
So for my understanding it just looks as if the ptp packets which the switch itself processes are not forwarded to the monitor destination.

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