Enabling Or Disabling Igmp Snooping - Cisco 2950 - Catalyst Switch Configuration Manual

Chapter 21 Configuring IGMP Snooping and MVR
Table 21-3 Default IGMP Snooping Configuration (continued)
Feature
IGMP snooping Immediate Leave
Static groups
IP multicast-source-only learning
PIM v2 multicast router discovery
Aging forward-table entries (when source-only
learning is enabled)
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
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.
78-11380-10
Default Setting
Disabled.
None configured.
Enabled.
Enabled
Enabled. The default is 600 seconds
(10 minutes).
Enabled.
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.
Return to privileged EXEC mode.
(Optional) Save your entries in the configuration file.
Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
Configuring IGMP Snooping
21-7