DES-3526 / DES-3526DC Layer 2 Fast Ethernet Switch CLI Reference Manual
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config igmp_snooping
leave_timer <sec 1-16711450> − Specifies the amount of time a
Multicast address will stay in the database before it is deleted, after it
has sent out a leave group message. An entry of zero (0) specifies an
immediate deletion of the Multicast address. The default is 2 seconds.
state [enable | disable] − Allows you to enable or disable IGMP
snooping for the specified VLAN.
Restrictions Only administrator-level users can issue this command.
Example usage:
To configure IGMP snooping:
DES-3526:4#config igmp_snooping default host_timeout 250 state enable
Command: config igmp_snooping default host_timeout 250 state enable
Success.
DES-3526:4#
config igmp_snooping querier
Purpose This command configures IGMP snooping querier.
Syntax
config igmp_snooping querier [<vlan_name 32> | all] {query_interval <sec
1-65535> | max_response_time <sec 1-25> | robustness_variable <value 1-
255> | last_member_query_interval <sec 1-25> | state [enable | disable]
Description Used to configure the time in seconds between general query transmissions, the
maximum time in seconds to wait for reports from members and the permitted
packet loss that guarantees IGMP snooping.
Parameters
<vlan_name 32> − The name of the VLAN for which IGMP snooping querier is to
be configured.
query_interval <sec 1-65535> − Specifies the amount of time in seconds
between general query transmissions. The default setting is 125 seconds.
max_response_time <sec 1-25> − Specifies the maximum time in seconds to
wait for reports from members. The default setting is 10 seconds.
robustness_variable <value 1-255> − 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 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. Although 1 is
specified as a valid entry, the robustness variable should not be one or
problems may arise.
last_member_query_interval <sec 1-25> − The maximum amount of time
between group-specific query messages, including those sent in response to
leave-group messages. You might lower this interval to reduce the amount of
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