The value of vRtrPimNgIfHelloMultiplier specifies the multiplier for
determining the holdtime for a PIM neighbor on this interface.
The hello-multiplier in conjunction with the hello-interval
will determine the holdtime for a PIM neighbor.
The formula used to calculate the hello-holdtime based
on the hello-multiplier is -
(hello-interval * hello-multiplier) / 10
The hello-multiplier is specified in multiples of 0.1.
This allows the PIMv2 default timeout of 3.5 seconds to be
supported.