The three message primary test sequence confirms the existence of a fully functional bi directional path between {HEAD ~ the two access points} of {TAIL ~ a node} redundantly connected to a network 
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The three message primary test sequence confirms the existence of a fully functional bi directional path between { HEAD ~ the two access points } of { TAIL ~ a node } redundantly connected to a network
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH