The value of tmnxDot1agCfmGraceTxEnable specifies whether or not grace
period notifications will be sent to the ETH-CFM remote MEP peers. The
value 'true' enables grace period notifications, and the value 'false'
suppresses the notifications.
During an outage, the modification of this object from 'true' to
'false' will cause an immediate clear of all grace period
notifications, after which no further notifications will be sent. A
modification of this object from 'false' to 'true' will not enable the
transmission of grace period for any outages currently in progress but
will take effect for subsequent outages.