Specifies the frequency at which the automatic PE deletion
should take place.
This object specifies the number of times of
rttMonMplslmCtrlScanInterval (rttMplsVpnMonCtrlDelScanFactor *
rttMplsVpnMonCtrlScanInterval) to wait before removing the PEs.
This object doesn't directly specify the explicit value to
wait before removing the PEs that were down.
If this object set 0 the entries will never removed.