Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.14.1.0 - Page 381
Configuring IGMP Snooping, Removing a Group-Port Association
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• IGMP snooping reacts to spanning tree protocol (STP) and multiple spanning tree protocol (MSTP) topology changes by sending a general query on the interface that transitions to the forwarding state. • If IGMP snooping is enabled on a PIM-enabled VLAN interface, data packets using the router as an Layer 2 hop may be dropped. To avoid this scenario, Dell EMC Networking recommends that users enable IGMP snooping on server-facing end-point VLANs only. Configuring IGMP Snooping Configuring IGMP snooping is a one-step process. To enable, view, or disable IGMP snooping, use the following commands. There is no specific configuration needed for IGMP snooping with virtual link trunking (VLT). For information about VLT configurations, refer to Virtual Link Trunking (VLT). • Enable IGMP snooping on a switch. CONFIGURATION mode ip igmp snooping enable • View the configuration. CONFIGURATION mode show running-config • Disable snooping on a VLAN. INTERFACE VLAN mode no ip igmp snooping Related Configuration Tasks • Removing a Group-Port Association • Disabling Multicast Flooding • Specifying a Port as Connected to a Multicast Router • Configuring the Switch as Querier Example of ip igmp snooping enable Command DellEMC(conf)#ip igmp snooping enable DellEMC(conf)#do show running-config igmp ip igmp snooping enable DellEMC(conf)# Removing a Group-Port Association To configure or view the remove a group-port association feature, use the following commands. • Configure the switch to remove a group-port association after receiving an IGMP Leave message. INTERFACE VLAN mode ip igmp fast-leave • View the configuration. INTERFACE VLAN mode show config Example of Configuration Output After Removing a Group-Port Association DellEMC(conf-if-vl-100)#show config ! interface Vlan 100 no ip address Internet Group Management Protocol (IGMP) 381
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