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The wording read as a claim about the CPU interface in general, which is wrong and misleading: the 8051 sits behind an ordinary port of the internal switch and is an ordinary member of a forwarding mask - which is exactly what this implementation relies on. Say what is actually broken instead: the trap action, a separate mechanism whose destination is an external CPU port these boards do not populate. Record the measurements behind it, including the widened CPU_PMSK and both external-CPU destinations, and add the ACL trap result - a rule matching the group intercepts frames but does not deliver them either, which is a second, independent path to the same conclusion. Reported-by: vDorst