Reference Guide

396 | Internet Group Management Protocol (IGMP)
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IGMP Snooping Implementation Information
• IGMP Snooping on Dell Networking OS uses IP multicast addresses not MAC addresses.
• IGMP Snooping is supported on all S5000 stack members.
• IGMP Snooping reacts to STP and MSTP topology changes by sending a general query on the
interface that transitions to the forwarding state.
Configuring IGMP Snooping
Configuring IGMP Snooping is a one-step process. That is, enable it on a switch using the command ip
igmp snooping enable
from CONFIGURATION mode. View the configuration using the command show
running-config
from CONFIGURATION mode, as shown in the following example. You can disable
snooping on for a VLAN using the command
no ip igmp snooping from INTERFACE VLAN mode.
There is no specific configuration needed for IGMP Snooping in conjunction with VLT. For information
on VLT configuration, refer to Virtual Link Trunking (VLT).
Figure 20-9. Enabling IGMP Snooping
Related Configuration Tasks
• Enabling IGMP Immediate-leave
• Disabling Multicast Flooding
• Specifying a Port as Connected to a Multicast Router
• Configuring the Switch as Querier
Enabling IGMP Immediate-leave
Configure the switch to remove a group-port association upon receiving an IGMP Leave message using the
command
ip igmp fast-leave from INTERFACE VLAN mode. View the configuration using the command
show config from INTERFACE VLAN mode, as shown in the example below.
Figure 20-10. Enabling IGMP Snooping
Dell(conf)#ip igmp snooping enable
Dell(conf)#do show running-config igmp
ip igmp snooping enable
Dell(conf)#
Dell(conf-if-vl-100)#show config
!
interface Vlan 100
no ip address
ip igmp snooping fast-leave
shutdown
Dell(conf-if-vl-100)#