D-Link DES-3526 Reference Manual - Page 135

config igmp_snooping querier, config router_ports, IGMP Querier or Non-querier.

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DES-3526 Layer 2 Fast Ethernet Switch config igmp_snooping querier • 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. last_member_query_interval − 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 time it takes a router to detect the loss of the last member of a group. state [enable | disable] − Allows the Switch to be specified as an IGMP Querier or Non-querier. Restrictions Only administrator-level users can issue this command. Example usage: To configure IGMP snooping: DES-3526:4#config igmp_snooping querier default query_interval 125 state enable Command: config igmp_snooping querier default query_interval 125 state enable Success. DES-3526:4# config router_ports Purpose Used to configure ports as router ports. Syntax config router_ports [add | delete] Description This command allows you to designate a range of ports as being connected to multicast-enabled routers. This will ensure that all 127

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DES-3526 Layer 2 Fast Ethernet Switch
config igmp_snooping querier
•
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.
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 time it takes a router to detect the loss of the
last member of a group.
state [enable | disable]
−
Allows the Switch to be specified as an
IGMP Querier or Non-querier.
Restrictions
Only administrator-level users can issue this command.
Example usage:
To configure IGMP snooping:
DES-3526:4#config igmp_snooping querier default query_interval 125
state enable
Command: config igmp_snooping querier default query_interval 125
state enable
Success.
DES-3526:4#
config router_ports
Purpose
Used to configure ports as router ports.
Syntax
config router_ports <vlan_name 32> [add | delete] <portlist>
Description
This command allows you to designate a range of ports as being
connected to multicast-enabled routers. This will ensure that all
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