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Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
OL-8978-04
Chapter 51 Configuring Multicast Services
Configuring IGMP Snooping on the Switch
This example shows how to specify the IGMP mode to IGMP-only and verify the configuration:
Console> (enable) set igmp mode igmp-only
IGMP mode set to igmp-only
Console> (enable) show igmp mode
IGMP Mode: igmp-only
IGMP Operational Mode: igmp-only
IGMP Address Aliasing Mode: normal
Console> (enable)
Specifying the IGMP Leave-Query Type
You can specify the IGMP leave-query type to be used when a port receives a leave message from a host.
When you specify a MAC-based general query, a leave query is sent for the exact GDA, and the version 1
or 2 hosts that have at least one membership for a group using that GDA will respond. When you specify
a general query, the reports from all version 1 and 2 hosts for all groups are registered. You can also
specify the auto mode. If you specify auto mode, a group-specific query is sent if there are no version 1
hosts in the network and a general query is sent if there are version 1 hosts in the network. A
group-specific query provides faster network convergence.
By default, a MAC-based general query is sent when a port receives a leave message.
To specify the leave-query type, perform this task in privileged mode:
This example shows how to set the IGMP leave-query type to a group-specific-query:
Console> (enable) set igmp leave-query-type auto-mode
IGMP Leave Query Type set to auto-mode
Console> (enable) show igmp leave-query-type
IGMP Leave Query Type : Group-Specific Query
Console> (enable)
Enabling IGMP Fast-Leave Processing
To enable IGMP fast-leave processing, perform this task in privileged mode:
Task Command
Step 1
Specify the IGMP leave-query type. set igmp leave-query-type auto-mode |
general-query | mac-gen-query
Step 2
Display the IGMP leave-query type. show igmp leave-query-type
Task Command
Step 1
Enable IGMP fast-leave processing on the switch. set igmp fastleave enable
Step 2
Verify that IGMP fast-leave processing is
enabled.
show multicast protocols status
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