Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?


robust-count (IGMP Snooping)


Hierarchy Level


Configure the number of queries a device sends before removing a multicast group from the multicast forwarding table. We recommend that the robust count be set to the same value on all multicast routers and switches in the VLAN.

This option provides fine-tuning to allow for expected packet loss on a subnet. You can wait more intervals if subnet packet loss is high and IGMP report messages might be lost.

Use the query-interval, query-last-member-interval, or query-response-interval statements in the same hierarchy to configure interval lengths.


number—Number of intervals the switch waits before timing out a multicast group.

  • Range: 2 through 10

  • Default: 2

Required Privilege Level

routing—To view this statement in the configuration.

routing-control—To add this statement to the configuration.

Release Information

Statement introduced in Junos OS Release 8.5.