The value of sapEthCfmVMepFilter specifies whether ETH-CFM PDUs
egressing the sap or sdp-binding at the same level or lower than
that of the configured service MEP (the virtual MEP) should be
discarded or continue to egress.
Only PDUs that were originated from the virtual MEP or from the
networks side of the service will be affected, local down MEP ETH-CFM
transmission are not. When set to 'true' ETH-CFM PDUs with the same or
lower level as the virtual MEP will be discarded. When set to 'false',
egressing ETH-CFM PDUs will pass freely as per the existing ETH-CFM
configuration.