This read-write value, in seconds and defaulting to 125, is similar to the standard igmpInterfaceQueryInterval from RFC 2933 but sets a global value applying to all IGMP-enabled interfaces at once; a value of zero disables this global override so each interface uses its own igmpInterfaceQueryInterval instead, while a value greater than zero takes precedence over per-interface settings. Admins use this to standardize the IGMP query interval across the whole device without configuring each interface separately. For example, setting it to 60 forces every IGMP-enabled interface to send queries every 60 seconds, overriding their individual settings.