EXFO FTB-8500 Series for FTB-500 - Manual (Page 305)

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Ethernet and Fibre Channel Application 291
IGMP
Configuration

IGMP Version: Indicates the supported IGMP version which is IGMP
version 2. Note that version 2 is interoperable with version 3 as per
RFC 3376.

Join Timeout (s): The join timeout is the maximum period for the
requested stream to be received before it is declared failed. Choices
are 1 to 1000 seconds. The default Join Timeout is 5 seconds.