C
HAPTER
37
| Multicast Filtering Commands
IGMP Snooping
– 855 –
EXAMPLE
The following example enables TCN flooding.
Console(config)#ip igmp snooping tcn-flood
Console(config)#
ip igmp snooping
tcn-query-solicit
This command instructs the switch to send out an IGMP general query
solicitation when a spanning tree topology change notification (TCN)
occurs. Use the no form to disable this feature.
SYNTAX
[no] ip igmp snooping tcn-query-solicit
DEFAULT SETTING
Disabled
COMMAND MODE
Global Configuration
COMMAND USAGE
â—† When the root bridge in a spanning tree receives a topology change
notification for a VLAN where IGMP snooping is enabled, it issues a
global IGMP leave message (query solicitation). When a switch receives
this solicitation, it floods it to all ports in the VLAN where the spanning
tree change occurred. When an upstream multicast router receives this
solicitation, it will also immediately issues an IGMP general query.
â—† The ip igmp snooping tcn query-solicit command can be used to
send a query solicitation whenever it notices a topology change, even if
the switch is not the root bridge in the spanning tree.
EXAMPLE
The following example instructs the switch to issue an IGMP general query
whenever it receives a spanning tree topology change notification.
Console(config)#ip igmp snooping tcn query-solicit
Console(config)#
ip igmp snooping
unregistered-data-
flood
This command floods unregistered multicast traffic into the attached VLAN.
Use the no form to drop unregistered multicast traffic.
SYNTAX
[no] ip igmp snooping unregistered-data-flood
DEFAULT SETTING
Disabled
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