IGMP Querier

IGMP Querier emulates a source of general IGMP queries in an IPv4 multicast segment. Use it to test multicast subscriptions, switch and router behavior in the presence of a querier, and correct group handling by receivers.

Table 204 — IGMP Querier Parameters

Name	Description	Value
Instance ID	IGMP Querier identifier	Specify a number and bind it to the Control Plane interface
Version	IGMP version	Usually 2; select the version expected by the test network
Query interval	Interval between general queries	125 seconds by default
Query response interval	Maximum query response time	In tenths of a second; 100 = 10 seconds
Robustness	Message-loss robustness factor	2 by default
Last member query interval	Repeat-query interval when the last group member leaves	In tenths of a second; 10 = 1 second
Last member query count	Number of repeated last-member queries	2 by default
Teardown time	Teardown delay after the task stops	0 means no additional delay

Bind IGMP Querier to the interface where multicast receivers are expected. In the results, check the groups, member count, and state changes after Join/Leave. If multicast groups do not appear, first check the VLAN, interface IP network, and IGMP version.