27-5
Software Configuration Guide—Release IOS XE 3 6.0E and IOS 15.2(2)E
OL_28731-01
Chapter 27 Configuring IGMP Snooping and Filtering, and MVR
Configuring IGMP Snooping
Configuring IGMP Snooping
Note When configuring IGMP, configure the VLAN in the VLAN database mode. See Chapter 16,
“Configuring VLANs, VTP, and VMPS.”
IGMP snooping allows switches to examine IGMP packets and make forwarding decisions based on their
content.
These sections describe how to configure IGMP snooping:
• Default IGMP Snooping Configuration, page 27-5
• Enabling IGMP Snooping Globally, page 27-6
• Enabling IGMP Snooping on a VLAN, page 27-6
• Configuring Learning Methods, page 27-7
• Configuring a Static Connection to a Multicast Router, page 27-8
• Enabling IGMP Immediate-Leave Processing, page 27-8
• Configuring the IGMP Leave Timer, page 27-9
• Configuring IGMP Snooping Querier, page 27-10
• Configuring Explicit Host Tracking, page 27-11
• Configuring a Host Statically, page 27-11
• Suppressing Multicast Flooding, page 27-12
Default IGMP Snooping Configuration
Table 27-1 shows the IGMP snooping default configuration values.
Table 27-1 IGMP Snooping Default Configuration Values
Feature Default Value
IGMP snooping Enabled
Multicast routers None configured
Explicit Host Tracking Enabled for IGMPv3; Not available for IGMPv2
Immediate-leave processing Enabled for IGMPv3; Disabled for IGMPv2
Report Suppression Enabled
IGMP snooping learning method PIM/DVMRP
1
1. PIM/DVMRP = Protocol Independent Multicast/Distance Vector Multicast Routing Protocol
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