Reference Guide

If the IP SA in the incoming IGMP general query frame is lower than the IP address of the VLAN interface, the
switch disables its IGMP snooping Querier functionality.
If the IP SA of the incoming IGMP general query is higher than the VLAN IP address, the switch continues to
work as an IGMP snooping Querier.
ip igmp snooping enable
Enable IGMP snooping on all or a single VLAN. This command is the master on/off switch to enable IGMP snooping.
S4820T
Syntax
ip igmp snooping enable
To disable IGMP snooping, use the no ip igmp snooping enable command.
Defaults Disabled.
Command Modes
• CONFIGURATION
• INTERFACE VLAN
Command History
This guide is platform-specific. For command information about other platforms, refer to the
relevant FTOS Command Line Reference Guide .
The following is a list of the FTOS version history for this command.
Version 8.3.19.0 Introduced on the S4820T.
Version 8.3.11.1 Introduced on the Z9000.
Version 8.3.7.0 Introduced on the S4810.
Version 7.6.1.0 Introduced on the S-Series.
Version 7.5.1.0 Introduced on the C-Series.
E-Series legacy
command
Usage
Information
To enable IGMP snooping, enter this command. When you enable this command from
CONFIGURATION mode, IGMP snooping enables on all VLAN interfaces (except the default
VLAN).
NOTE: Execute the no shutdown command on the VLAN interface for IGMP Snooping
to function.
Related
Commands
shutdown — (no shutdown) activates an interface.
ip igmp snooping fast-leave
Enable IGMP snooping fast-leave for this VLAN.
S4820T
Syntax
ip igmp snooping fast-leave
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