Brocade Communications Systems Brocate Ethernet Access Switch 6910 - Manual (Page 503)

Brocade 6910 Ethernet Access Switch Configuration Guide 453
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IGMP Snooping
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The proxy query and unsolicited MRD request are flooded to all VLAN ports except for the
receiving port when the switch receives such packets.
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
• 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.
• 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