D-Link 3312SR Reference Manual - Page 133
config igmp_snooping querier, IGMP Querier or Non-querier.
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DGS-3312SR Layer 3 Gigabit Switch config igmp_snooping querier 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. • By default, the robustness variable is set to 2. You might want to increase this value if you expect a subnet to be lossy. 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 the igmp snooping: DGS-3312SR:4#config igmp_snooping querier default query_interval 125 state enable Command: config igmp_snooping querier default query_interval 125 state enable Success. DGS-3312SR:4# 127