# IGMP Interfaces

Device > Configure > Multicasting > IGMP Option

The IGMP Interfaces dialog box lists all the interfaces on which IGMP is enabled.

To view the definition for a particular MIB variable, click the appropriate link from the following list:

- Query Interval (igmpInterfaceQueryInterval)

- IGMP Version (igmpInterfaceVersion)

- IGMP Querier (igmpInterfaceQuerier)

- Query Response Time (igmpInterfaceQueryMaxResponseTime)

- Version 1 Querier Timer (igmpInterfaceVersion1QuerierTimer)

- Interface Robustness (igmpInterfaceRobustness)

The following list specifies buttons in this dialog box, as well as their function:

- Click OK to continue.

- Click Apply to save the changes in the dialog box.

- Click Cancel to close the dialog box.

- Click Refresh to update the contents of the dialog box.

- Click Print to print the contents of the dialog box.

- Click Help to access online help.

Query Interval (igmpInterfaceQueryInterval)

Frequency at which IGMP Host-Query packets are transmitted on this interface.

IGMP Version (igmpInterfaceVersion)

Version of IGMP running on this interface. For IGMP to function correctly, all routers on a LAN must be configured to run the same version of IGMP.

IGMP Querier (igmpInterfaceQuerier)

Address of the IGMP Querier on the IP subnet this interface is attached to.

Query Response Time (igmpInterfaceQueryMaxResponseTime)

Maximum query response time advertised in IGMPv2 queries on this interface.

Version 1 Querier Timer (igmpInterfaceVersion1QuerierTimer)

Time remaining until the host assumes that there are no IGMPv1 routers present on the interface. Until the value of this object is zero, the host will reply to all queries with version 1 membership reports.

Interface Robustness (igmpInterfaceRobustness)

The robustness variable can be adjusted to deal with expected packet loss on a subnet. If a subnet is expected to be lossy, the robustness variable should be increased.