The value of tmnxOamMfibPingCtlSrcAddress specifies the Internet
address to be used as the source for performing an OAM ping
operation when tmnxOamPingCtlTestMode has a value of 'mfibPing'
and the value of tmnxOamMfibPingCtlDestMacAddr is all zeros, in
which case this parameter is required. If tmnxOamPingCtlTestMode is
different from 'mfibPing' this field is ignored.