D-Link DGS-3630 Emulator 1 - Page 765
ip igmp snooping robustness-variable
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DGS-3630 Layer 3 Stackable Managed Switch CLI Reference Guide Example This example shows how to enable report suppression on VLAN 1. Switch# configure terminal Switch(config)# vlan 1 Switch(config-vlan)# ip igmp snooping report-suppression Switch(config-vlan)# 54-18 ip igmp snooping robustness-variable This command is used to set the robustness variable used in IGMP snooping. Use the no form of this command to revert to the default setting. ip igmp snooping robustness-variable VALUE no ip igmp snooping robustness-variable Parameters VALUE Specifies the robustness variable. The value is from 1 to 7. Default By default, this value is 2. Command Mode VLAN Configuration Mode. Command Default Level Level: 12. Usage Guideline This command is only available for VLAN interface configuration. The robustness variable provides fine-tuning to allow for expected packet loss on an interface. The value of the robustness variable is used in calculating the following IGMP message intervals: • Group member interval - The 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 - The 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 - The 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. Users can increase this value if a subnet is expected to be loose. 760
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