Ip Igmp Snooping Tcn-Query-Solicit - Edge-Core ES3528MV2 Management Manual

| Multicast Filtering Commands
C 39
HAPTER
IGMP Snooping
ip igmp snooping
tcn-query-solicit
ip igmp snooping
unregistered-data-
flood
E
XAMPLE
The following example enables TCN flooding.
Console(config)#ip igmp snooping tcn-flood
Console(config)#
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.
S
YNTAX
[no] ip igmp snooping tcn-query-solicit
D S
EFAULT ETTING
Disabled
C M
OMMAND ODE
Global Configuration
C U
OMMAND SAGE
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.
E
XAMPLE
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)#
This command floods unregistered multicast traffic into the attached VLAN.
Use the no form to drop unregistered multicast traffic.
S
YNTAX
[no] ip igmp snooping unregistered-data-flood
D S
EFAULT ETTING
Disabled
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