The value this router inserts into the Override_Interval
field of the LAN Prune Delay option in the PIM Hello
messages it sends on this interface.
When overriding a prune, PIM routers pick a random timer
duration up to the value of this object. The more PIM
routers that are active on a network, the more likely it is
that the prune will be overridden after a small proportion
of this time has elapsed.
The more PIM routers are active on this network, the larger
this object should be to obtain an optimal spread of prune
override latencies.