Bad FCS in Sync messages

  • 0
  • 1
  • Question
  • Updated 2 years ago
  • Answered
Dear Experts,

The FCS of gPTP sync messages sent by Extreme Networks AVB Switch Summit x440-24t is marked in Wireshark as bad.
I have the following firmware on my switch:
* X440-24t.4 # show version
Switch      : 800471-00-12 1407N-41055 Rev 12.0 BootROM:    IMG: 
PSU-1       : Internal Power Supply 
PSU-2       :

Image   : ExtremeXOS version v1541b3-patch1-12 by release-manager
          on Sat May 3 12:30:21 EDT 2014
BootROM :
Diagnostics : 6.3

Is there a fix for this issue?

Best regards,
Jakub Mielczarek
Photo of Jakub Mielczarek

Jakub Mielczarek

  • 180 Points 100 badge 2x thumb

Posted 2 years ago

  • 0
  • 1
Photo of Chad Smith

Chad Smith, Alum

  • 5,660 Points 5k badge 2x thumb

I do not think the packets actually have a bad FCS.  This could be related to how they are being captured or a Wireshark issue.

How are you capturing the traffic and what version of Wireshark are you using?