@Sc0th Thank you for taking the time to share your insights within the TP-Link Community. Your feedback is greatly appreciated and has been formally documented and escalated to our Product...

@Intersys Thank you for your post. Regarding the SFP+ port flapping you mentioned—does it affect all SFP+ ports on both switches? How are you managing the devices, and do the logs show any related...

@ot9192 This is likely a compatibility issue. I recommend continuing to use the TELUS internet or considering a router replacement. You can also try adjusting the WAN-side MTU to see if that improves...

@mimi234 Thank you for your post. I will forward the issue you described. Due to differences in firmware versions, configuration import/export between them is currently not supported.

@VolkerS What is the exact Tapo model? Are these devices managed locally? Is the issue occurring on only one Tapo unit?

@GRL Let me summarize the issues you’ve raised. According to your tests, the problem is specific to the ER8411: changing the ISP-side MTU size affects VPN operation—when the MTU is set below 1,378...