Default Igmp Snooping Configuration; Enabling Or Disabling Igmp Snooping - Cisco WS-C3560-48PS-S Software Configuration Manual

Chapter 19 Configuring IGMP Snooping and MVR

Default IGMP Snooping Configuration

Table 19-3
Table 19-3 Default IGMP Snooping Configuration
Feature
IGMP snooping
Multicast routers
Multicast router learning (snooping) method
IGMP snooping Immediate Leave
Static groups
IGMP report suppression

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.
Beginning in privileged EXEC mode, follow these steps to enable IGMP snooping on a VLAN interface:
Command
Step 1
configure terminal
Step 2
ip igmp snooping vlan vlan-id
Step 3
end
Step 4 copy running-config startup-config
78-16156-01
shows the default IGMP snooping configuration.
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.
Purpose
Enter global configuration mode.
Enable IGMP snooping on the VLAN interface.The VLAN ID range
is 1 to 4094.
Note
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
Enabled
IGMP snooping must be globally enabled before you can
enable VLAN snooping.
Catalyst 3560 Switch Software Configuration Guide
Configuring IGMP Snooping
19-7