Reference Guide

360 | Internet Group Management Protocol (IGMP)
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IGMP Snooping Implementation Information
• IGMP Snooping on FTOS uses IP multicast addresses not MAC addresses.
• IGMP Snooping is not supported on stacked VLANs.
• IGMP Snooping is supported on all S-Series stack members,.
• 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.
Configuring IGMP Snooping
Configuring IGMP Snooping is a one-step process. That is, enable it on a switch using the ip igmp
snooping enable command from CONFIGURATION mode. View the configuration using the show
running-config command from CONFIGURATION mode, as shown in Figure 19-9. You can disable
snooping on for a VLAN using the
no ip igmp snooping command from INTERFACE VLAN mode.
Figure 19-9. 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
ip igmp fast-leave command from INTERFACE VLAN mode. View the configuration using the show
config command from INTERFACE VLAN mode, as shown in Figure 19-10.
Figure 19-10. Enabling IGMP Snooping
FTOS(conf)#ip igmp snooping enable
FTOS(conf)#do show running-config igmp
ip igmp snooping enable
FTOS(conf)#
FTOS(conf-if-vl-100)#show config
!
interface Vlan 100
no ip address
ip igmp snooping fast-leave
shutdown
FTOS(conf-if-vl-100)#