Command Line Reference Guide

536 | Internet Group Management Protocol (IGMP)
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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 C-Series and S-Series, unregistered multicast data traffic is dropped when flooding is disabled;
they do not forward the packets to multicast router ports. On the C-Series and S-Series, Layer 3
multicast must be disabled (no ip multicast-routing) in order to disable Layer 2 multicast flooding.
Syntax
ip igmp snooping flood
Defaults
Enabled
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 7.6.1.0 Introduced on S-Series
Version 7.5.1.0 Introduced on C-Series
E-Series legacy command