Indicate how auto configuration procedure is triggerred on this
port or virtual UNI/NNI instance, phy indicates auto configuration
is only triggered when the port detects physical layer connection
is from down to up, logic indicates auto configuration procedure
is triggerred when CSM port receives trap from peer port, while
phy_logic indicate auto configuration procedure is triggerred by
both phy and logic, which are situations described by above
narrative