This value is the duration, in seconds, that a DVMRP prune message tells an upstream router to stop forwarding multicast traffic for a group with no downstream receivers. An admin adjusts this to control how long a pruned branch of the multicast tree stays suppressed before the upstream router resumes forwarding and the receiver has to re-request the prune. For example, at the default of 200 seconds, an interface with no active receivers for a group tells its upstream neighbor to withhold that group's traffic for about three minutes before re-evaluating.