The value of vRtrPimNgIfStickyDR specifies whether to enable or
disable sticky-dr operation on this interface.
If sticky-dr is turned on, the priority in PIM hellos sent on this
interface when elected as DR will be modified to the value
configured in vRtrPimNgIfStickyDRPriority. This is done to avoid the
delays in forwarding caused by DR recovery, when switching back
to the old DR on a LAN when it comes back up.
By enabling sticky-dr on this interface, it will continue to act
as the DR for the LAN even after the old DR comes back up.