topic Re: PTPv1 packets are not propagating across the switches in ExtremeSwitching (EXOS/Switch Engine)

PTPv1 packets are not propagating across the switches

Hewshott_IT — Fri, 19 Jun 2026 02:23:26 GMT

I found this information: “If AVB is also in use on this switch, with Dante traffic passing over the same links, see: PTPv1 packets are dropped when gPTP is enabled on a port” Is this right?

https://extreme-networks.my.site.com/ExtrArticleDetail?an=000063026&q=dante

I have several 5320 switches for an AV setup. I have two VLANs set up. First for AVB. Second for Dante.

gPTP is enabled
IGMP is enabled
snooping is enabled
Querier is set to the 48-port switch

PTP appears to be working on the 24-port switch, as it selects a device as the master clock. The issue is that the DSP connected to the 48-port switch does not participate in the process and elects itself as the master clock.

Anyone able to assist with this setup?

Re: PTPv1 packets are not propagating across the switches

Necheporenko__N — Tue, 30 Jun 2026 08:38:55 GMT

Hello,

>> I found this information: “If AVB is also in use on this switch, with Dante traffic passing over the same links, see: PTPv1 packets are dropped when gPTP is enabled on a port” Is this right?

This issue has been fixed ~2018 and related to the "xos0067493 PTPv1 packets are dropped on the port if GPTP is enabled on the same port."

https://documentation.extremenetworks.com/release_notes/ExtremeXOS/21.1.5-Patch1-9/GUID-D6B4BD5B-E3BE-43F4-9925-9C5F9C7FFF0D.shtml

Please check the article below, with log events described there it might be easier to identify the root cause

https://extreme-networks.my.site.com/ExtrArticleDetail?an=000077379&q=gptp

Another useful output in your case is:

"show network-clock gptp port <PORT_NUMBER>"