Command Reference Guide

Internet Group Management Protocol (IGMP) | 563
Command
History
Usage
Information
You must enter this command to enable IGMP snooping. When enabled from
CONFIGURATION mode, IGMP snooping is enabled on all VLAN interfaces (except
default VLAN).
Related
Commands
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
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.
ip igmp snooping flood
c e s
This command controls the flooding behavior of unregistered multicast data packets. On the
E-Series, when flooding is enabled (the default), unregistered multicast data traffic is flooded
to all ports in a VLAN. When flooding is disabled, unregistered multicast data traffic is
forwarded to only multicast router ports, both static and dynamic, in a VLAN. If there is no
multicast router port in a VLAN, then unregistered multicast data traffic is dropped. On the
Version 8.3.7.0 Introduced on S4810
Version 7.6.1.0 Introduced on S-Series
Version 7.5.1.0 Introduced on C-Series
E-Series legacy command
Note: You must execute the no shutdown command on the VLAN interface for IGMP
Snooping to function.
no shutdown Activate an interface
Version 8.3.7.0 Introduced on S4810
Version 7.6.1.0 Introduced on S-Series
Version 7.5.1.0 Introduced on C-Series
E-Series legacy command