Flush Protocol enable/disable -
ATM_LEC_FLUSH_ENABLED - ATM LE flush protocol is used when switching VCs.
If the Flush timeout (wflecFlushTimeOut) expires data for that MAC address
will start flowing over the old VC again.
ATM_LEC_FLUSH_DISABLED - ATM LE flush protocol is not used. Instead data
for that MAC address will automatically start flowing over the new VC once
the Path Switching delay timeout (wflecPathSwitchingDelay) has expired.