Default Igmp Snooping Configuration; Enabling Or Disabling Igmp Snooping - Cisco Catalyst 2975 Software Configuration Manual

Chapter 22 Configuring IGMP Snooping and MVR

Default IGMP Snooping Configuration

Table 22-3
Table 22-3
Feature
IGMP snooping
Multicast routers
Multicast router learning (snooping) method
IGMP snooping Immediate Leave
Static groups
TCN
TCN query solicitation
IGMP snooping querier
IGMP report suppression
1. TCN = Topology Change Notification

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:
Command
Step 1
configure terminal
Step 2 ip igmp snooping
Step 3 end
Step 4 copy running-config startup-config
To globally disable IGMP snooping on all VLAN interfaces, use the no ip igmp snooping global
configuration command.
OL-19720-02
shows the default IGMP snooping configuration.
Default IGMP Snooping Configuration
1
flood query count
Purpose
Enter global configuration mode.
Globally enable IGMP snooping in all existing VLAN interfaces.
Return to privileged EXEC mode.
(Optional) Save your entries in the configuration file.
Default Setting
Enabled globally and per VLAN
None configured
PIM-DVMRP
Disabled
None configured
2
Disabled
Disabled
Enabled
Catalyst 2975 Switch Software Configuration Guide
Configuring IGMP Snooping
22-7