D-Link DES-3250TG Reference Manual page 171

DES-3250TG Layer 2 Fast Ethernet Switch User's Guide
config igmp_snooping querier
robustness variable is used in calculating
the following IGMP message intervals:
last_member_query_interval <sec 1-65535>
− The maximum amount of time between
•
Group member interval—Amount of
time that must
multicast router decides there are
no more members of a group on a
network. This interval is calculated
as follows: (robustness variable
x query interval)
query response interval).
•
Other querier present
Amount of time that must pass
before a multicast router decides
that there is no longer another
multicast router that is the querier.
This interval is
follows: (robustness variable x
query interval)
query response interval).
•
Last member query count—Number
of group-specific queries sent before
the router assumes there are no
local members of a group. The
default number is the value of the
robustness variable.
•
By default, the robustness variable
is set to 2. You might want to
increase this value if you expect a
subnet to be lossy.
171
pass before a
+ (1 x
interval—
calculated as
+ (0.5 x