51-10
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
OL-8978-04
Chapter 51 Configuring Multicast Services
Configuring IGMP Snooping on the Switch
Configuring IGMP Snooping on the Switch
IGMP snooping allows the switches to examine the IGMP packets and make the forwarding decisions
based on their content.
Note Quality of service (QoS) does not support the IGMP traffic when IGMP snooping is enabled.
These sections describe how to configure IGMP snooping:
• Default IGMP Snooping Configuration, page 51-10
• IGMP Snooping Configuration Guidelines, page 51-11
• Enabling IGMP Snooping, page 51-11
• Enabling IGMP Flooding, page 51-12
• Specifying the IGMP Snooping Mode, page 51-12
• Specifying the IGMP Leave-Query Type, page 51-13
• Enabling IGMP Fast-Leave Processing, page 51-13
• Enabling IGMP Version 3 Snooping, page 51-14
• Enabling IGMP Version 3 Fast-Block Processing, page 51-15
• Enabling IGMP Rate Limiting, page 51-15
• Enabling the IGMP Querier, page 51-16
• Displaying Multicast Router Information, page 51-17
• Displaying Multicast Group Information, page 51-18
• Displaying IGMP Snooping Statistics, page 51-18
• Disabling IGMP Fast-Leave Processing, page 51-19
• Disabling IGMP Snooping, page 51-19
Default IGMP Snooping Configuration
Table 51-2 shows the default IGMP snooping configuration.
Note IGMP snooping is enabled by default in all supervisor engine software releases in the 7.x and 8.x release
trains. It is enabled by default in software release 5.5(9) and later releases in the 5.x release train and in
software release 6.3(1) and later releases in the 6.x train.
Table 51-2 IGMP Snooping Default Configuration
Feature Default Value
IGMP snooping Enabled
Multicast routers None configured
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