21-7
Catalyst 2960 and 2960-S Switches Software Configuration Guide, Release 15.0(1)SE
OL-26520-01
Chapter 21 Configuring IGMP Snooping and MVR
Configuring IGMP Snooping
Configuring IGMP Snooping
IGMP snooping allows switches to examine IGMP packets and make forwarding decisions based on their
content. These sections contain this configuration information:
• Default IGMP Snooping Configuration, page 21-7
• Enabling or Disabling IGMP Snooping, page 21-7
• Setting the Snooping Method, page 21-8
• Configuring a Multicast Router Port, page 21-9
• Configuring a Host Statically to Join a Group, page 21-10
• Enabling IGMP Immediate Leave, page 21-10
• Configuring the IGMP Leave Timer, page 21-11
• Configuring TCN-Related Commands, page 21-12
• Configuring the IGMP Snooping Querier, page 21-14
• Disabling IGMP Report Suppression, page 21-16
Default IGMP Snooping Configuration
Table 21-3 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.
Table 21-3 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
TCN
1
flood query count
1. TCN = Topology Change Notification
2
TCN query solicitation Disabled
IGMP snooping querier Disabled
IGMP report suppression Enabled
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