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A port set to admit tagged frames only will never see a BPDU, because delivery rides the forward action and the ingress pipeline drops untagged frames before the L2 lookup. The failure is silent and looks like a dead receive path: the port turns edge after three seconds, the bridge elects itself root, and nothing hints at the ingress setting. Diagnosing exactly that cost most of a day on a live switch, with the neighbour provably transmitting the whole time. stp_setup() now prints one line per affected port, so the hint lands at "stp on" and at every config replay on boot. The check runs in its own loop after the MSTP write: port_ingress_filter_get() reads a register into sfr_data, which the state-building loop above is still using. The port number in the message is physical, matching what the ingress command takes. doc/stp.md explains why this can happen here and not on a normal bridge, where BPDUs are consumed before any VLAN classification. stp.rel stays at DSEG 5 with no OSEG and the image at 10498 bytes of XDATA.