When the value of tmnxOamMacPingCtlRegister is 'true', the
OAM ping request is transmitted that causes each upstream node
to delete the MAC address only from its forwarding plane but
keep it in its control plane in order to inhibit dynamic learning.
If its value is 'false', the MAC address is deleted from both
the forwarding and control planes.
This object is optional and is not relevant when
tmnxOamPingCtlTestMode has a value other than 'macPurge'.