This timer is used when proxy-reporting is disabled,the
switch then has to suppress multiple IGMPv2/ MLDv1 report
messages for the same group from being forwarded to the router.
This is the interval (in seconds) within which report
messages for the same multicast group will not be forwarded.
The 'ReportForwardTimer' is per multicast group. This timer is
started as soon as a report message for that group is forwarded
out. Within this 'ReportForwardInterval' if another report for
the same group arrives, that report will not be forwarded.