Reference Guide

• When enabled, IGMP snooping Querier will not start if there is a statically configured multicast router
interface in the VLAN.
• When enabled, IGMP snooping Querier starts after one query interval in case no IGMP general query
(with IP SA lower than its VLAN IP address) is received on any of its VLAN members.
• When enabled, IGMP snooping Querier periodically sends general queries with an IP source address
of the VLAN interface. If it receives a general query on any of its VLAN member, it checks the IP
source address of the incoming frame.
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 is the master on/off switch to enable IGMP snooping.
S5000
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
Version 9.0(1.3) Introduced on the S5000.
Usage
Information
You must enter this command to enable IGMP snooping. When you enable this
from CONFIGURATION mode, IGMP snooping enables on all VLAN interfaces
(except the default VLAN).
NOTE: You must execute the no shutdown command on the VLAN interface
for IGMP Snooping to function.
Related
Commands
shutdown – (no shutdown) activates an interface.
Internet Group Management Protocol (IGMP)
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