DGS-3024 Layer 2 Switch CLI Reference Manual
Example usage:
To configure the igmp snooping:
DGS-3024:4#config igmp_snooping default host_timeout 250 state enable
Command: config igmp_snooping default host_timeout 250 state enable
Success.
DGS-3024:4#
config igmp_snooping querier
Purpose 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.
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 This command configures IGMP snooping querier.
Parameters
<vlan_name 32> − The name of the VLAN for which IGMP snooping querier
is to be configured.
all – Selecting this parameter will configure IGMP for all VLANs on the
Switch.
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. Users may wish to
increase this value if a subnet is expected to be lossy.
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. The user may lower this interval to reduce the
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