OS10 Enterprise Edition User Guide Release 10.4.0E(R3)

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IGMP snooping

IGMP snooping enables switches to use the information in IGMP packets and generate a forwarding table that associates ports with multicast groups. When switches receive multicast frames, they forward them to their intended receivers.

OS10 supports IGMP snooping on VLAN interfaces and sends out query packets to VLAN member ports.

Configure IGMP snooping

  • Enable IGMP snooping globally with the ip igmp snooping enable command in the CONFIGURATION mode. This command enables both IGMPv2 and MLDv1 snooping on all VLAN interfaces.
  • (Optional) You can disable IGMP snooping on specific 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. Configure the member port as multicast router interface, using the ip igmp snooping mrouter interface interface—type command in VLAN INTERFACE mode.
IGMP snooping configuration
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
                                 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
                                 --more--
                                 
                                 
                                 <<Output Truncated>>
                              
show ip igmp snooping mrouter
                                 Interface   Router Ports
                                 vlan3031    port-channel31
                                 vlan3032    port-channel31
                                 vlan3033    port-channel31
                                 vlan3034    port-channel31
                                 vlan3035    port-channel31
                                 vlan3036    port-channel31
                                 vlan3037    port-channel31
                                 vlan3038    port-channel31
                                 vlan3039    port-channel31
                                 vlan3040    port-channel31
                                 vlan3041    port-channel31
                                 vlan3042    port-channel31
                                 vlan3043    port-channel31
                                 vlan3044    port-channel31
                                 vlan3045    port-channel31
                                 vlan3046    port-channel31
                                 vlan3047    port-channel31
                                 vlan3048    port-channel31
                                 vlan3049    port-channel31
                                 vlan3050    port-channel31
                                 vlan3051    port-channel31
                                 vlan3052    port-channel31
                                 --more--
                                 
                                 
                                 <<Output Truncated>>
                              
OS10# show ipv6 mld snooping groups
                                 Total Number of Groups: 1110
                                 MLD Connected Group Membership
                                 Group Address                                     Interface        Mode
                                 ff02::2                                           vlan3031         MLDv1-Compat
                                 Member Ports: port-channel31
                                 ff02::1:ff00:0                                    vlan3031         MLDv1-Compat
                                 Member Ports: port-channel31
                                 ff02::1:ff00:b                                    vlan3031         MLDv1-Compat
                                 Member Ports: port-channel31
                                 ff02::1:ff00:c                                    vlan3031         MLDv1-Compat
                                 Member Ports: port-channel31
                                 ff02::1:ff00:f                                    vlan3031         MLDv1-Compat
                                 Member Ports: ethernet1/1/6:1
                                 ff02::1:ff00:11                                   vlan3031         MLDv1-Compat
                                 Member Ports: port-channel31
                                 ff02::1:ff0c:86c9                                 vlan3031         MLDv1-Compat
                                 Member Ports: port-channel31
                                 ff02::1:ff31:0                                    vlan3031         MLDv1-Compat
                                 Member Ports: port-channel31, ethernet1/1/6:1
                                 ff02::1:ffaa:9bcc                                 vlan3031         MLDv1-Compat
                                 Member Ports: port-channel31
                                 ff0e:225:1::                                      vlan3031         MLDv1-Compat
                                 Member Ports: port-channel31, ethernet1/1/6:1
                                 --more--
                                 
                                 
                                 
                                 <<Output Truncated>>
                              

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