Adjusting Control Parameters for Prune

When the last member leaves a group, the multicast device sends a Prune message upstream, requesting the upstream device to execute the prune action. If other downstream devices on the same network segment need the multicast data for this group, they need to send Join messages to override the prune action.

Configuring the Period for an Interface to Keep the Prune State: The period for an interface to keep the prune state can be set either globally or on an interface. After the period expires, the pruned interface starts to forward messages again. If the multicast device receives a State-Refresh message before the period expires, it resets the timer, that is, it refreshes the prune state.

Configuring the Delay for Transmitting Prune Messages in a LAN: The delay for transmitting Prune messages in a LAN can be set either globally or on an interface. When the values of lan-delay on all devices along the same link are different, the maximum value of these values is preferred.

Configuring the Interval for Overriding the Prune Action: When a device sends a Prune message to the upstream in the same network segment, if other devices still need to receive the multicast data, the device must send a Join message upstream within the override-interval.