Cisco Systems 3560 사용자 설명서

 shows the default IGMP snooping configuration.

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.

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

TCN

1

 flood query count

1.

TCN = Topology Change Notification

2

TCN query solicitation

Disabled

IGMP snooping querier

Disabled

IGMP report suppression

Enabled

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.