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PTPv1 packets are dropped when gPTP is enabled on a port

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TitlePTPv1 packets are dropped when gPTP is enabled on a port
Symptoms
  • PTPv1 packets are dropped by the switch
  • Dante clocks go out of sync when AVB is enabled on a port
Environment
  • EXOS 15.6 and higher
  • Summit G2 platforms
  • gPTP
Cause
Due to a mis-programming of the switching hardware, the PTPv1 packets are incorrectly dropped when gPTP is enabled on the ingress port.
Resolution
This will be fixed via CR xos0067493. This fix is scoped for the following releases of EXOS:
  • EXOS 22.3.1
  • EXOS 21.1.4
Additional notes
While this can affect Dante devices when AVB is enabled, this issue is more broad than just AVB and Dante.

Dante uses PTPv1 for its timing synchronization, and AVB uses gPTP. When Dante traffic must travel over an AVB enabled link, this issue can cause Dante clocks to go out of sync.

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