Cisco Systems 3130 User Manual

23-8

Cisco Catalyst Blade Switch 3130 for Dell Software Configuration Guide

OL-13270-01

Chapter 23 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:

To disable IGMP snooping on a VLAN interface, use the no ip igmp snooping vlan vlan-id global
configuration command for the specified VLAN number.

IGMP snooping querier

Disabled

IGMP report suppression

Enabled

TCN = Topology Change Notification

Table 23-3

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.