Dell PowerSwitch S4112F-ON OS10 Enterprise Edition User Guide Release 10.4.1.0 - Page 384
Internet Group Management Protocol, IGMP snooping
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Internet Group Management Protocol Internet Group Management Protocol (IGMP) is a communications protocol that hosts use on IPv4 networks to establish multicast group memberships. OS10 supports IGMPv1, IGMPv2, and IGMPv3 to manage the multicast group memberships on IPv4 networks. NOTE: OS10 does not support IGMP snooping in VLT environments. 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. Configure IGMP snooping • Enable IGMP snooping globally with the ip igmp snooping enable command in the CONFIGURATION mode. This command enables IGMP snooping on all VLAN interfaces. • (Optional) You can disable IGMP snooping on specific VLAN interfaces using the no ip igmp snooping command in the VLAN INTERFACE mode. • In a network, the snooping switch is connected to a multicast Router that sends IGMP queries. On a Layer 2 network that does not have a multicast router, you can configure the snooping switch to act as querier. Use the ip igmp snooping querier command in the VLAN INTERFACE mode to send the queries. • OS10 learns the multicast router interface dynamically based on the interface on which IGMP membership query is received. To assign a multicast router interface statically, use the ip igmp snooping mrouter interface interface-type command in VLAN INTERFACE mode. • (Optional) Configure the IGMP version using the ip igmp version version-number command in the VLAN INTERFACE mode. • (Optional) The fast leave option allows the IGMP snooping switch to remove an interface from the multicast group immediately on receiving the leave message. Enable fast leave with the ip igmp snooping fast-leave command in VLAN INTERFACE mode. • (Optional) Configure the time interval for sending IGMP general queries with the ip igmp snooping query-interval query-interval-time command in VLAN INTERFACE mode. • (Optional) Configure the maximum time for responding to a query advertised in IGMP queries using the ip igmp snooping query-max-resp-time query-response-time command in VLAN INTERFACE mode. • (Optional) Configures the time interval between group-specific IGMP query messages with the ip igmp snooping lastmember-query-interval query-interval-time command in VLAN INTERFACE mode. IGMP snooping configuration OS10(config)# ip igmp snooping enable OS10(config)# interface vlan 100 OS10(conf-if-vl-100)# ip igmp snooping mrouter interface ethernet 1/1/32 OS10(conf-if-vl-100)# ip igmp snooping querier OS10(conf-if-vl-100)# ip igmp version 3 OS10(conf-if-vl-100)# ip igmp snooping fast-leave OS10(conf-if-vl-100)# ip igmp snooping query-interval 60 OS10(conf-if-vl-100)# ip igmp snooping query-max-resp-time 10 OS10(conf-if-vl-100)# ip igmp snooping last-member-query-interval 1000 View IGMP snooping information OS10# show ip igmp snooping groups Total Number of Groups: 480 IGMP Connected Group Membership Group Address Interface Mode 225.1.0.0 vlan3531 IGMPv2-Compat Member-ports :port-channel41,ethernet1/1/51,ethernet1/1/52 Expires 00:01:35 384 Layer 3
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