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DES-3028 DES-3028P DES-3028G DES-3052 DES-3052P Layer 2 Fast Ethernet Switch CLI Reference Manual
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config igmp_snooping
leave_timer <sec 0-16711450>  Specifies the maximum amount of time in
seconds between the Switch receiving a leave group message from a host, and
the Switch issuing a group membership query. If no response to the membership
query is received before the Leave Timer expires, the (multicast) forwarding entry
for that host is deleted. The default setting is 2.
Note: The leave timer does not need to be configured as its action has no effect on
the IGMP snooping settings.
state [enable | disable]  Allows users 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-3028P:4# config igmp
_
snooping default host
_
timeout 250
state enable
Command: config igmp
_
snooping default host
_
timeout 250 state
enable
Success.
DES-3028P: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 <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
The config igmp_snooping querier command configures IGMP snooping
querier.
Parameters
<vlan_name 32> – The name of the VLAN for which IGMP snooping querier is to
be configured.
query_interval <sec 1-25>  Specifies the amount of time in seconds between
general query transmissions. the default setting is 125 seconds.
max_response_time  The maximum time in seconds to wait for reports from
members. The default setting is 10 seconds.
robustness_variable  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.