DES-3250TG Layer 2 Fast Ethernet Switch User’s Guide
171
config igmp_snooping querier
robustness variable is used in calculating
the following IGMP message intervals:
•
Group member interval—Amount of
time that must pass before a
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) + (1 x
query response interval)
.
•
Other querier present interval—
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 calculated as
follows:
(robustness variable x
query interval) + (0.5 x
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.
last_member_query_interval <sec 1-65535>
−
The maximum amount of time between
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