20-8
Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
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Chapter 20 Configuring IGMP Snooping and MVR
Configuring IGMP Snooping
• Disabling IGMP Report Suppression, page 20-12
• Disabling IP Multicast-Source-Only Learning, page 20-13
• Configuring the Aging Time, page 20-14
• Configuring the IGMP Snooping Querier, page 20-14
Default IGMP Snooping Configuration
Table 20-3 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.
Table 20-3 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.
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