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A blocked port does pass a received BPDU up to the CPU. The evidence is in logicog's capture of a looped pair: the port the loop check had already blocked kept reporting a BPDU age of zero seconds across dumps taken more than a forward delay apart, and that counter is only cleared in stp_in(). That is also what makes the loop latch work, since the port that stays forwarding has to go on hearing the blocked one. The tag flag comment said the source address is not learned on the egress port. doc/CpuPort.md defines it as not learning the source address from the frame at all, which is the narrower claim to make. The dangling heading above it described a field that is documented there too.