User`s guide

DES-3226S Layer 2 Switch CLI Reference
202
config igmp_snooping querier
querier.
Parameters
<vlan_name 32> − The name of the VLAN for
which IGMP snooping querier is to be
configured.
query_interval <sec> − Specifies the amount of
time in seconds between general query
transmissions. The default setting is 125
seconds.
max_response_time <sec> − Specifies the
maximum time in seconds to wait for reports
from members. The default setting is 10
seconds.
robustness_variable <value> − Provides fine-
tuning to allow for expected packet loss on a
subnet. The value of the 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