Default igmp snooping configuration, Enabling or disabling igmp snooping – IBM 12.1(22)EA6 User Manual

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Cisco Systems Intelligent Gigabit Ethernet Switch Modules for the IBM BladeCenter, Software Configuration Guide

24R9746

Chapter 14 Configuring IGMP Snooping and MVR

Configuring IGMP Snooping

Default IGMP Snooping Configuration

Table 14-3

shows the default IGMP snooping configuration.

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:

Table 14-3

Default IGMP Snooping Configuration

Feature

Default Setting

IGMP snooping

Enabled globally and per VLAN.

Multicast routers

None configured.

Multicast router learning (snooping) method

PIM-DVMRP.

IGMP snooping Immediate Leave

Disabled.

Static groups

None configured.

IP multicast-source-only learning

Enabled.

PIM v2 multicast router discovery

Enabled

Aging forward-table entries (when source-only
learning is enabled)

Enabled. The default is 600 seconds
(10 minutes).

IGMP report suppression

Enabled.

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.