D-Link xstack DGS-3612G Instruction Manual page 140

Example usage:
To configure IGMP snooping:
DGS-3612G:4#config igmp_snooping vlan default host_timeout 250 state enable
Command: config igmp_snooping vlan default host_timeout 250 state enable
Success.
DGS-3612G:4#
config igmp_snooping querier
Purpose
Syntax
Description
Parameters
xStack DGS-3612G Layer 3 Gigabit Ethernet Managed Switch CLI Manual
NOTE: The Fast Leave function in the config igmp_snooping command can only
be implemented if IGMP is disabled for all IP interfaces on the Switch. Configuring
this function when IGMP is enabled will produce the error message "Cannot set
Fast leave when IGMP is running" and consequently will not be implemented.
This command configures IGMP snooping querier.
config igmp_snooping querier [vlan <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]
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.
<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 roubustness
variable should not be one or problems may arise.
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