OS10 Enterprise Edition User Guide Release 10.4.1.0

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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.

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 last-member-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                Expires
                                 225.1.0.0                     vlan3531            IGMPv2-Compat       00:01:35
                                 Member-ports :port-channel41,ethernet1/1/51,ethernet1/1/52
                                 225.1.0.1                     vlan3531            IGMPv2-Compat       00:01:35
                                 Member-ports :port-channel41,ethernet1/1/51,ethernet1/1/52
                                 225.1.0.2                     vlan3531            IGMPv2-Compat       00:01:35
                                 Member-ports :port-channel41,ethernet1/1/51,ethernet1/1/52
                                 225.1.0.3                     vlan3531            IGMPv2-Compat       00:01:35
                                 Member-ports :port-channel41,ethernet1/1/51,ethernet1/1/52
                                 225.1.0.4                     vlan3531            IGMPv2-Compat       00:01:35
                                 Member-ports :port-channel41,ethernet1/1/51,ethernet1/1/52
                                 225.1.0.5                     vlan3531            IGMPv2-Compat       00:01:35
                                 Member-ports :port-channel41,ethernet1/1/51,ethernet1/1/52
                                 225.1.0.6                     vlan3531            IGMPv2-Compat       00:01:35
                                 Member-ports :port-channel41,ethernet1/1/51,ethernet1/1/52
                                 225.1.0.7                     vlan3531            IGMPv2-Compat       00:01:35
                                 Member-ports :port-channel41,ethernet1/1/51,ethernet1/1/52
                                 225.1.0.8                     vlan3531            IGMPv2-Compat       00:01:35
                                 Member-ports :port-channel41,ethernet1/1/51,ethernet1/1/52
                                 225.1.0.9                     vlan3531            IGMPv2-Compat       00:01:35
                                 Member-ports :port-channel41,ethernet1/1/51,ethernet1/1/52
                                 --more--  
                                 
                                 
                                 <<Output Truncated>>
                              
OS10# show ip igmp snooping interface
                                 Vlan100 is up, line protocol is up
                                 IGMP version is 3
                                 IGMP snooping is enabled on interface
                                 IGMP snooping query interval is 60 seconds
                                 IGMP snooping querier timeout is 130 seconds
                                 IGMP snooping last member query response interval is 1000 ms
                                 IGMP Snooping max response time is 10 seconds
                                 IGMP snooping fast-leave is disabled on this interface
                                 IGMP snooping querier is enabled on this interface
                                 
                                 
                              
show ip igmp snooping mrouter
                                 Interface    Router Ports
                                 Vlan 100      ethernet 1/1/32
                                 
                              

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