Hello.
I have RPI 5. For a long time I waited for PoE HAT. I decided to try PoE from Waveshare Electronics with SKU:28411 - POE M.2 HAT+. Also I use Ubiquiti infrastructure. I have Ubiquiti Switch with 4 PoE+ ports and all of them in use. Total budget is approx 60W and consumed approx 17W, so it is enought for all connected devices.
I noticed, that my switch in these connections regularly rebooted. I decided to investigate failure and passed support log files to Ubiquiti. After analyse logs Ubiquiti made conclussion:
So it is not good news for me. Tell me please is it way to fix this BPDUs? Maybe I need to add some settings features or do something else?
P.S. Unfortunately I do not have another Switch to test PoE behavior on it.
I have RPI 5. For a long time I waited for PoE HAT. I decided to try PoE from Waveshare Electronics with SKU:28411 - POE M.2 HAT+. Also I use Ubiquiti infrastructure. I have Ubiquiti Switch with 4 PoE+ ports and all of them in use. Total budget is approx 60W and consumed approx 17W, so it is enought for all connected devices.
I noticed, that my switch in these connections regularly rebooted. I decided to investigate failure and passed support log files to Ubiquiti. After analyse logs Ubiquiti made conclussion:
Code:
It looks like the RPI-5 on port-1 is sending the excessive BPDUs on the port, which is making the port flap and resulting in the spike of the switch's CPU and in the end the switch is being unresponsive: [2025-07-15T08:23:29,114+03:00] <14>Jul 15 08:23:29 USW-Lite-8-PoE ac8ba96816ff,USW-Lite-8-PoE-7.1.26+15869: : swmon[379]: swmon.nl_poe_cb(): PoE Port[1]: power up[2025-07-15T08:23:38,457+03:00] <5>Jul 15 08:23:38 USW-Lite-8-PoE ac8ba96816ff,USW-Lite-8-PoE-7.1.26+15869: kernel: [ 3304.540000] Port 1 link up[2025-07-15T08:23:38,608+03:00] <4>Jul 15 08:23:38 USW-Lite-8-PoE ac8ba96816ff,USW-Lite-8-PoE-7.1.26+15869: kernel: [ 3304.690000] Port 1 moving from Disabled to Blocking[2025-07-15T08:23:39,427+03:00] <5>Jul 15 08:23:39 USW-Lite-8-PoE ac8ba96816ff,USW-Lite-8-PoE-7.1.26+15869: kernel: [ 3305.510000] Port 1 link down[2025-07-15T08:23:39,607+03:00] <4>Jul 15 08:23:39 USW-Lite-8-PoE ac8ba96816ff,USW-Lite-8-PoE-7.1.26+15869: kernel: [ 3305.690000] Port 1 moving from Blocking to Disabled[2025-07-15T08:23:42,337+03:00] <5>Jul 15 08:23:42 USW-Lite-8-PoE ac8ba96816ff,USW-Lite-8-PoE-7.1.26+15869: kernel: [ 3308.420000] Port 1 link up[2025-07-15T08:23:42,357+03:00] <4>Jul 15 08:23:42 USW-Lite-8-PoE ac8ba96816ff,USW-Lite-8-PoE-7.1.26+15869: kernel: [ 3308.440000] Port 1 moving from Disabled to Blocking[2025-07-15T08:23:45,357+03:00] <4>Jul 15 08:23:45 USW-Lite-8-PoE ac8ba96816ff,USW-Lite-8-PoE-7.1.26+15869: kernel: [ 3311.440000] Port 1 moving from Blocking to Forwarding This is why the network stabilizes when you disconnect the RPI-5. You might need to remove it from your network. P.S. Unfortunately I do not have another Switch to test PoE behavior on it.
Statistics: Posted by follet — Sat Jul 19, 2025 10:43 am