EXFO FTB-8500 Series for FTB-500 - Manual (Page 303)

IPTV Tabs
Ethernet and Fibre Channel Application 289
IGMP
Enable Auto-Join, available when the test is stopped, enables the
IGMP auto-join function. The IGMP Auto-Join function configures the
system to issue join request to join multicast groups when the test is
started.
Join, available when the test is started, issues a join request for the
selected multicast streams and enables the IGMP auto-join function for
these steams.

Disable Auto-Join / Leave button: This button toggles from Disable
Auto-Join to Leave when the test is started.
Disable Auto-Join, available when the test is stopped, disables the
IGMP auto-join function.
Leave, available when the test is started, issues a leave request for the
selected multicast streams and disables the IGMP auto-join function
for these streams.
Results
The following results apply to the selected multicast stream.

Join Request
Count: Indicates the number of join requests sent.
Successful: Indicates the number of streams received before the join
timeout expires.
Failed: Indicates the number of streams undetected within the join
timeout.

Leave Request: Indicates the number of leave group requests for the
selected multicast stream.

Specific Query: Indicates the number of group specific query
received.