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br0: port 1(eth0) entered forwarding state br0: port 1(eth0) entered blocking state bcmgenet fd580000.genet eth0: Link is Up - 1Gbps/Full - flow control off br0: port 1(eth0) entered disabled state bcmgenet fd580000.genet eth0: Link is Down I'll try if plugging the RPi4B in another Switch changes the behaviour. Looking in the dmesg output I can see that the problem is happening from tine to time. Afterwards it started to work again without any change from my side. The NIC stoped working for 15 to 20 minutes. The Log of the Switch didn't show any problems). Two further reboots didn't help only after restarting the switch the Link would come up again.
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The LEDs of the NIC flashed every few seconds but I couldn't get a Link. Yeserday the network stopped to work and I rebooted (the System is Headless). Since I switched to the Pi4B I had Problems with the NIC. Had it running on an Pi3B with buster while I waited for the Pi4B without any Problems. The System is the old system upgraded to buster. It's an System with a manualy configured IP. I seem to have similar Problems with my new Pi4. Network hangs until mii-tool -r is called or the network cable is unplugged and replugged. Network should come up without problems every time. Maybe it's even some kind of "hardware problem".īut on affected Raspberry Pi 4 board, everything you have to do is to reboot. Seems like not everyone is able to reproduce this bug. This also "unblocks" the network card and makes dhcpcd get a new IP. It is also possible to reset from the non-functional state by running This triggers fetching a valid IP and properly enables the network interface. The problem resets if I unplug and replug the network cable. Means that dhcpcd does not manage to get an IP and trying to manually run dhcpcd on the interface hangs forever. If I boot directly to an up-to-date Raspbian, then the network starts up in some kind of "no-functional" state.