Dell Force10 S55T FTOS Command Line Reference Guide for the S55 System FTOS 8. - Page 439

ip igmp snooping enable c e s Enable IGMP snooping on all or a single VLAN. This is the master on/off switch to enable IGMP snooping. Syntax ip igmp snooping enable To disable IGMP snooping, enter no ip igmp snooping enable command. Defaults Disabled Command Modes CONFIGURATION INTERFACE VLAN Command History Version 8.3.5.0 Introduced on the S55. Version 7.6.1.0 Introduced on S-Series Version 7.5.1.0 Introduced on C-Series E-Series legacy command Usage You must enter this command to enable IGMP snooping. When enabled from CONFIGURATION Information mode, IGMP snooping is enabled on all VLAN interfaces (except default VLAN). Note: You must execute the no shutdown command on the VLAN interface for IGMP Snooping to function. Related Commands no shutdown Activate an interface ip igmp snooping fast-leave c e s Enable IGMP snooping fast leave for this VLAN. Syntax ip igmp snooping fast-leave To disable IGMP snooping fast leave, use the no igmp snooping fast-leave command. Defaults Not configured Command Modes INTERFACE VLAN-(conf-if-vl-n) Command History Version 8.3.5.0 Introduced on the S55. Version 7.6.1.0 Introduced on S-Series Version 7.5.1.0 Introduced on C-Series E-Series legacy command Usage Information Queriers normally send a certain number of queries when a leave message is received prior to deleting a group from the membership database. There may be situations in which fast deletion of a group is required. When IGMP fast leave processing is enabled, the switch will remove an interface from the multicast group as soon as it detects an IGMP version 2 leave message on the interface. Internet Group Management Protocol (IGMP) | 439