24-8
Catalyst 3750 Switch Software Configuration Guide
OL-8550-02
Chapter 24 Configuring IGMP Snooping and MVR
Configuring IGMP Snooping
Enabling or Disabling IGMP Snooping
By default, IGMP snooping is globally enabled on the switch. When globally enabled or disabled, it is
also enabled or disabled in all existing VLAN interfaces. IGMP snooping is by default enabled on all
VLANs, but can be enabled and disabled on a per-VLAN basis.
Global IGMP snooping overrides the VLAN IGMP snooping. If global snooping is disabled, you cannot
enable VLAN snooping. If global snooping is enabled, you can enable or disable VLAN snooping.
Beginning in privileged EXEC mode, follow these steps to globally enable IGMP snooping on the
switch:
To globally disable IGMP snooping on all VLAN interfaces, use the no ip igmp snooping global
configuration command.
Beginning in privileged EXEC mode, follow these steps to enable IGMP snooping on a VLAN interface:
IGMP snooping querier Disabled
IGMP report suppression Enabled
1. TCN = Topology Change Notification
Table 24-3 Default IGMP Snooping Configuration (continued)
Feature Default Setting
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
ip igmp snooping Globally enable IGMP snooping in all existing VLAN interfaces.
Step 3
end Return to privileged EXEC mode.
Step 4
copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
ip igmp snooping vlan vlan-id Enable IGMP snooping on the VLAN interface.The VLAN ID range
is 1 to 1001 and 1006 to 4094.
Note IGMP snooping must be globally enabled before you can
enable VLAN snooping.
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