+---+                               +---+
+--+    |   |    +---+    +---+    +---+    |   |    +--+
|CE|----|PE |----| P |----| P |----| P |----|PE |----|CE|
+--+    |   |    +---+    +---+    +---+    |   |    +--+
        +---+                               +---+

   o----o---------- CFM (Service OAM) ----------o----o

          o-------- EVPN Network OAM ---------o

          o--------o--------o--------o--------o MPLS OAM

   o----o   o----o   o----o   o----o   o----o   o----o 802.3 OAM
                                                       [IEEE-802.3]