ip pim-sparse override-interval


ip pim-sparse override-interval <INTERVAL-VALUE>

no ip pim-sparse override-interval 


Configures the override interval that gets inserted into the Override Interval field of a LAN Prune Delay option.

The no form of this command removes the currently configured value and sets the value to the default of 2500 ms.

Command context






Specifies the override interval of a LAN Prune Delay option in ms. Default: 2500 ms. Range: 500-6000.




A router sharing a VLAN with other multicast routers uses the override-interval value along with the propagation-delay value to compute the lan-prune-delay setting. The setting specifies how long to wait for a PIM-SM join after receiving a prune packet from downstream for a particular multicast group.

Example scenario:

A network may have multiple routers sharing VLAN X. When an upstream router is forwarding traffic from multicast group X to VLAN Y, if one of the routers on VLAN Y does not want this traffic, it issues a prune response to the upstream neighbor. The upstream neighbor then goes into a prune pending state for group X on VLAN Y. During this period, the upstream neighbor continues to forward the traffic. During the pending period, another router on VLAN Y can send a group X join to the upstream neighbor. If this happens, the upstream neighbor drops the prune pending status and continues forwarding the traffic. But if no routers on the VLAN send a join, the upstream router prunes.


Configuring and removing the override interval:

switch(config)# interface vlan40
switch(config-if-vlan)# ip pim-sparse override-interval 4000
switch(config-if-vlan)# no ip pim-sparse override-interval