Reference Guide

• (Optional) You can disable IGMP snooping on specic VLAN interfaces using the no ip igmp snooping enable command in the
VLAN INTERFACE mode.
• IGMP snooping functions in a network with a multicast router that generates IGMP queries. The tables created are associated with the
IGMP querier. Enable IGMP and MLD querier on a VLAN interface with the ip igmp snooping querier command in the VLAN
INTERFACE mode.
• You need to connect the multicast router to a physical port that is a member of the VLAN interface. The multicast router is used for
both IGMP and MLD snooping. Congure the member port as multicast router interface, using the ip igmp snooping mrouter
interface interface—type command in VLAN INTERFACE mode.
IGMP snooping conguration
OS10(config)# ip igmp snooping enable
OS10(config)# interface vlan 11
OS10(conf-if-vl-11)# ip igmp snooping mrouter interface ethernet 1/1/1
OS10(conf-if-vl-11)# ip igmp snooping querier
View IGMP snooping information
OS10# show ip igmp snooping groups
Total Number of Groups: 960
IGMP Connected Group Membership
Group Address Interface Mode
225.1.0.0 vlan3031 IGMPv2-Compat
Member Ports: ethernet1/1/6:1
225.1.0.1 vlan3031 IGMPv2-Compat
Member Ports: ethernet1/1/6:1
225.1.0.2 vlan3031 IGMPv2-Compat
Member Ports: ethernet1/1/6:1
225.1.0.3 vlan3031 IGMPv2-Compat
Member Ports: ethernet1/1/6:1
225.1.0.4 vlan3031 IGMPv2-Compat
Member Ports: ethernet1/1/6:1
225.1.0.5 vlan3031 IGMPv2-Compat
Member Ports: ethernet1/1/6:1
225.1.0.6 vlan3031 IGMPv2-Compat
Member Ports: ethernet1/1/6:1
225.1.0.7 vlan3031 IGMPv2-Compat
Member Ports: ethernet1/1/6:1
225.1.0.8 vlan3031 IGMPv2-Compat
Member Ports: ethernet1/1/6:1
225.1.0.9 vlan3031 IGMPv2-Compat
Member Ports: ethernet1/1/6:1
--more--
<<Output Truncated>>
OS10# show ip igmp snooping interface
Vlan3031 is up, line protocol is up
IGMP snooping is enabled on interface
IGMP snooping query interval is 125 seconds
IGMP snooping querier timeout is 255 seconds
IGMP snooping last member query response interval is 1000 ms
IGMP snooping fast-leave is disabled on this interface
IGMP snooping querier is enabled on this interface
Vlan3032 is up, line protocol is up
IGMP snooping is enabled on interface
IGMP snooping query interval is 125 seconds
IGMP snooping querier timeout is 255 seconds
IGMP snooping last member query response interval is 1000 ms
IGMP snooping fast-leave is disabled on this interface
IGMP snooping querier is enabled on this interface
Vlan3033 is up, line protocol is up
IGMP snooping is enabled on interface
IGMP snooping query interval is 125 seconds
IGMP snooping querier timeout is 255 seconds
334
Layer 3