25-5
Software Configuration Guide—Release IOS XE 3.3.0SG and IOS 15.1(1)SG
OL-25340-01
Chapter 25 Configuring IGMP Snooping and Filtering
Configuring IGMP Snooping
Configuring IGMP Snooping
Note When configuring IGMP, configure the VLAN in the VLAN database mode. See Chapter 15,
“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 25-5
• Enabling IGMP Snooping Globally, page 25-6
• Enabling IGMP Snooping on a VLAN, page 25-6
• Configuring Learning Methods, page 25-7
• Configuring a Static Connection to a Multicast Router, page 25-8
• Enabling IGMP Immediate-Leave Processing, page 25-8
• Configuring the IGMP Leave Timer, page 25-9
• Configuring IGMP Snooping Querier, page 25-10
• Configuring Explicit Host Tracking, page 25-11
• Configuring a Host Statically, page 25-11
• Suppressing Multicast Flooding, page 25-12
Default IGMP Snooping Configuration
Table 25-1 shows the IGMP snooping default configuration values.
Table 25-1 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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