D-Link DGS-6600-48T Product Manual - Page 271
ip igmp robustness-variable, show ip igmp interface
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DGS-6604 ip igmp robustness-variable ip igmp robustness-variable Use this command to tune for the expected packet loss on a network, i.e. the Robustness Variable of IGMP. ip igmp robustness-variable VALUE Syntax Description VALUE 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 membership 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 * query interval) + (1 * 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 * query interval) + (0.5 * query response interval). • Last member query count - Number of group-specific queries or groupsource-specific (with IGMP Version 3) query messages sent before the router assumes there are no local members of a group. The default number is the value of the robustness variable. The robustness variable range is from 1 to 7. Default Command Mode Usage Guideline Example VALUE: 2 VLAN Interface configuration This command is valid for the VLAN interface only. Use this command to modify the IGMP Robustness Variable on an interface. The IGMP Robustness Variable determines the number of general queries that IGMP sends before aging out a multicast address when there is no IGMP report response. In other words, this variable is also used as "last member query count". The group membership interval is equal to query-interval* robustness + max response time. The larger the Robustness Variable is set, the higher IGMP protocol packet loss is acceptable. IGMP can recover from robustness variable minus 1 lost IGMP packet. This example shows how to configure IGMP Robustness Variable value. It configures IGMP Robustness Variable value to 5 on interface VLAN 1000. Switch# configure terminal Switch(config)# interface vlan1000 Switch(config-if)# ip igmp robustness-variable 5 Switch(config-if)# end Verify the settings by entering the show ip igmp interface command. CLI Reference Guide 261